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/cred.h>
  18 #include <linux/uio.h>
  19 #include <linux/xattr.h>
  20 #include <linux/blkdev.h>
  21
  22 #include "hfs_fs.h"
  23 #include "btree.h"
  24
  25 static const struct file_operations hfs_file_operations;
  26 static const struct inode_operations hfs_file_inode_operations;
  27
  28 /*================ Variable-like macros ================*/
  29
  30 #define HFS_VALID_MODE_BITS  (S_IFREG | S_IFDIR | S_IRWXUGO)
  31
  32 static int hfs_read_folio(struct file *file, struct folio *folio)
  33 {
  34         return block_read_full_folio(folio, hfs_get_block);
  35 }
  36
  37 static void hfs_write_failed(struct address_space *mapping, loff_t to)
  38 {
  39         struct inode *inode = mapping->host;
  40
  41         if (to > inode->i_size) {
  42                 truncate_pagecache(inode, inode->i_size);
  43                 hfs_file_truncate(inode);
  44         }
  45 }
  46
  47 int hfs_write_begin(struct file *file, struct address_space *mapping,
  48                 loff_t pos, unsigned len, struct page **pagep, void **fsdata)
  49 {
  50         int ret;
  51
  52         *pagep = NULL;
  53         ret = cont_write_begin(file, mapping, pos, len, pagep, fsdata,
  54                                 hfs_get_block,
  55                                 &HFS_I(mapping->host)->phys_size);
  56         if (unlikely(ret))
  57                 hfs_write_failed(mapping, pos + len);
  58
  59         return ret;
  60 }
  61
  62 static sector_t hfs_bmap(struct address_space *mapping, sector_t block)
  63 {
  64         return generic_block_bmap(mapping, block, hfs_get_block);
  65 }
  66
  67 static bool hfs_release_folio(struct folio *folio, gfp_t mask)
  68 {
  69         struct inode *inode = folio->mapping->host;
  70         struct super_block *sb = inode->i_sb;
  71         struct hfs_btree *tree;
  72         struct hfs_bnode *node;
  73         u32 nidx;
  74         int i;
  75         bool res = true;
  76
  77         switch (inode->i_ino) {
  78         case HFS_EXT_CNID:
  79                 tree = HFS_SB(sb)->ext_tree;
  80                 break;
  81         case HFS_CAT_CNID:
  82                 tree = HFS_SB(sb)->cat_tree;
  83                 break;
  84         default:
  85                 BUG();
  86                 return false;
  87         }
  88
  89         if (!tree)
  90                 return false;
  91
  92         if (tree->node_size >= PAGE_SIZE) {
  93                 nidx = folio->index >> (tree->node_size_shift - PAGE_SHIFT);
  94                 spin_lock(&tree->hash_lock);
  95                 node = hfs_bnode_findhash(tree, nidx);
  96                 if (!node)
  97                         ;
  98                 else if (atomic_read(&node->refcnt))
  99                         res = false;
 100                 if (res && node) {
 101                         hfs_bnode_unhash(node);
 102                         hfs_bnode_free(node);
 103                 }
 104                 spin_unlock(&tree->hash_lock);
 105         } else {
 106                 nidx = folio->index << (PAGE_SHIFT - tree->node_size_shift);
 107                 i = 1 << (PAGE_SHIFT - tree->node_size_shift);
 108                 spin_lock(&tree->hash_lock);
 109                 do {
 110                         node = hfs_bnode_findhash(tree, nidx++);
 111                         if (!node)
 112                                 continue;
 113                         if (atomic_read(&node->refcnt)) {
 114                                 res = false;
 115                                 break;
 116                         }
 117                         hfs_bnode_unhash(node);
 118                         hfs_bnode_free(node);
 119                 } while (--i && nidx < tree->node_count);
 120                 spin_unlock(&tree->hash_lock);
 121         }
 122         return res ? try_to_free_buffers(folio) : false;
 123 }
 124
 125 static ssize_t hfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 126 {
 127         struct file *file = iocb->ki_filp;
 128         struct address_space *mapping = file->f_mapping;
 129         struct inode *inode = mapping->host;
 130         size_t count = iov_iter_count(iter);
 131         ssize_t ret;
 132
 133         ret = blockdev_direct_IO(iocb, inode, iter, hfs_get_block);
 134
 135         /*
 136          * In case of error extending write may have instantiated a few
 137          * blocks outside i_size. Trim these off again.
 138          */
 139         if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) {
 140                 loff_t isize = i_size_read(inode);
 141                 loff_t end = iocb->ki_pos + count;
 142
 143                 if (end > isize)
 144                         hfs_write_failed(mapping, end);
 145         }
 146
 147         return ret;
 148 }
 149
 150 static int hfs_writepages(struct address_space *mapping,
 151                           struct writeback_control *wbc)
 152 {
 153         return mpage_writepages(mapping, wbc, hfs_get_block);
 154 }
 155
 156 const struct address_space_operations hfs_btree_aops = {
 157         .dirty_folio    = block_dirty_folio,
 158         .invalidate_folio = block_invalidate_folio,
 159         .read_folio     = hfs_read_folio,
 160         .writepages     = hfs_writepages,
 161         .write_begin    = hfs_write_begin,
 162         .write_end      = generic_write_end,
 163         .migrate_folio  = buffer_migrate_folio,
 164         .bmap           = hfs_bmap,
 165         .release_folio  = hfs_release_folio,
 166 };
 167
 168 const struct address_space_operations hfs_aops = {
 169         .dirty_folio    = block_dirty_folio,
 170         .invalidate_folio = block_invalidate_folio,
 171         .read_folio     = hfs_read_folio,
 172         .write_begin    = hfs_write_begin,
 173         .write_end      = generic_write_end,
 174         .bmap           = hfs_bmap,
 175         .direct_IO      = hfs_direct_IO,
 176         .writepages     = hfs_writepages,
 177         .migrate_folio  = buffer_migrate_folio,
 178 };
 179
 180 /*
 181  * hfs_new_inode
 182  */
 183 struct inode *hfs_new_inode(struct inode *dir, const struct qstr *name, umode_t mode)
 184 {
 185         struct super_block *sb = dir->i_sb;
 186         struct inode *inode = new_inode(sb);
 187         if (!inode)
 188                 return NULL;
 189
 190         mutex_init(&HFS_I(inode)->extents_lock);
 191         INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
 192         spin_lock_init(&HFS_I(inode)->open_dir_lock);
 193         hfs_cat_build_key(sb, (btree_key *)&HFS_I(inode)->cat_key, dir->i_ino, name);
 194         inode->i_ino = HFS_SB(sb)->next_id++;
 195         inode->i_mode = mode;
 196         inode->i_uid = current_fsuid();
 197         inode->i_gid = current_fsgid();
 198         set_nlink(inode, 1);
 199         simple_inode_init_ts(inode);
 200         HFS_I(inode)->flags = 0;
 201         HFS_I(inode)->rsrc_inode = NULL;
 202         HFS_I(inode)->fs_blocks = 0;
 203         if (S_ISDIR(mode)) {
 204                 inode->i_size = 2;
 205                 HFS_SB(sb)->folder_count++;
 206                 if (dir->i_ino == HFS_ROOT_CNID)
 207                         HFS_SB(sb)->root_dirs++;
 208                 inode->i_op = &hfs_dir_inode_operations;
 209                 inode->i_fop = &hfs_dir_operations;
 210                 inode->i_mode |= S_IRWXUGO;
 211                 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_dir_umask;
 212         } else if (S_ISREG(mode)) {
 213                 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
 214                 HFS_SB(sb)->file_count++;
 215                 if (dir->i_ino == HFS_ROOT_CNID)
 216                         HFS_SB(sb)->root_files++;
 217                 inode->i_op = &hfs_file_inode_operations;
 218                 inode->i_fop = &hfs_file_operations;
 219                 inode->i_mapping->a_ops = &hfs_aops;
 220                 inode->i_mode |= S_IRUGO|S_IXUGO;
 221                 if (mode & S_IWUSR)
 222                         inode->i_mode |= S_IWUGO;
 223                 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_file_umask;
 224                 HFS_I(inode)->phys_size = 0;
 225                 HFS_I(inode)->alloc_blocks = 0;
 226                 HFS_I(inode)->first_blocks = 0;
 227                 HFS_I(inode)->cached_start = 0;
 228                 HFS_I(inode)->cached_blocks = 0;
 229                 memset(HFS_I(inode)->first_extents, 0, sizeof(hfs_extent_rec));
 230                 memset(HFS_I(inode)->cached_extents, 0, sizeof(hfs_extent_rec));
 231         }
 232         insert_inode_hash(inode);
 233         mark_inode_dirty(inode);
 234         set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
 235         hfs_mark_mdb_dirty(sb);
 236
 237         return inode;
 238 }
 239
 240 void hfs_delete_inode(struct inode *inode)
 241 {
 242         struct super_block *sb = inode->i_sb;
 243
 244         hfs_dbg(INODE, "delete_inode: %lu\n", inode->i_ino);
 245         if (S_ISDIR(inode->i_mode)) {
 246                 HFS_SB(sb)->folder_count--;
 247                 if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
 248                         HFS_SB(sb)->root_dirs--;
 249                 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
 250                 hfs_mark_mdb_dirty(sb);
 251                 return;
 252         }
 253         HFS_SB(sb)->file_count--;
 254         if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
 255                 HFS_SB(sb)->root_files--;
 256         if (S_ISREG(inode->i_mode)) {
 257                 if (!inode->i_nlink) {
 258                         inode->i_size = 0;
 259                         hfs_file_truncate(inode);
 260                 }
 261         }
 262         set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
 263         hfs_mark_mdb_dirty(sb);
 264 }
 265
 266 void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext,
 267                          __be32 __log_size, __be32 phys_size, u32 clump_size)
 268 {
 269         struct super_block *sb = inode->i_sb;
 270         u32 log_size = be32_to_cpu(__log_size);
 271         u16 count;
 272         int i;
 273
 274         memcpy(HFS_I(inode)->first_extents, ext, sizeof(hfs_extent_rec));
 275         for (count = 0, i = 0; i < 3; i++)
 276                 count += be16_to_cpu(ext[i].count);
 277         HFS_I(inode)->first_blocks = count;
 278
 279         inode->i_size = HFS_I(inode)->phys_size = log_size;
 280         HFS_I(inode)->fs_blocks = (log_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
 281         inode_set_bytes(inode, HFS_I(inode)->fs_blocks << sb->s_blocksize_bits);
 282         HFS_I(inode)->alloc_blocks = be32_to_cpu(phys_size) /
 283                                      HFS_SB(sb)->alloc_blksz;
 284         HFS_I(inode)->clump_blocks = clump_size / HFS_SB(sb)->alloc_blksz;
 285         if (!HFS_I(inode)->clump_blocks)
 286                 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
 287 }
 288
 289 struct hfs_iget_data {
 290         struct hfs_cat_key *key;
 291         hfs_cat_rec *rec;
 292 };
 293
 294 static int hfs_test_inode(struct inode *inode, void *data)
 295 {
 296         struct hfs_iget_data *idata = data;
 297         hfs_cat_rec *rec;
 298
 299         rec = idata->rec;
 300         switch (rec->type) {
 301         case HFS_CDR_DIR:
 302                 return inode->i_ino == be32_to_cpu(rec->dir.DirID);
 303         case HFS_CDR_FIL:
 304                 return inode->i_ino == be32_to_cpu(rec->file.FlNum);
 305         default:
 306                 BUG();
 307                 return 1;
 308         }
 309 }
 310
 311 /*
 312  * hfs_read_inode
 313  */
 314 static int hfs_read_inode(struct inode *inode, void *data)
 315 {
 316         struct hfs_iget_data *idata = data;
 317         struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
 318         hfs_cat_rec *rec;
 319
 320         HFS_I(inode)->flags = 0;
 321         HFS_I(inode)->rsrc_inode = NULL;
 322         mutex_init(&HFS_I(inode)->extents_lock);
 323         INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
 324         spin_lock_init(&HFS_I(inode)->open_dir_lock);
 325
 326         /* Initialize the inode */
 327         inode->i_uid = hsb->s_uid;
 328         inode->i_gid = hsb->s_gid;
 329         set_nlink(inode, 1);
 330
 331         if (idata->key)
 332                 HFS_I(inode)->cat_key = *idata->key;
 333         else
 334                 HFS_I(inode)->flags |= HFS_FLG_RSRC;
 335         HFS_I(inode)->tz_secondswest = sys_tz.tz_minuteswest * 60;
 336
 337         rec = idata->rec;
 338         switch (rec->type) {
 339         case HFS_CDR_FIL:
 340                 if (!HFS_IS_RSRC(inode)) {
 341                         hfs_inode_read_fork(inode, rec->file.ExtRec, rec->file.LgLen,
 342                                             rec->file.PyLen, be16_to_cpu(rec->file.ClpSize));
 343                 } else {
 344                         hfs_inode_read_fork(inode, rec->file.RExtRec, rec->file.RLgLen,
 345                                             rec->file.RPyLen, be16_to_cpu(rec->file.ClpSize));
 346                 }
 347
 348                 inode->i_ino = be32_to_cpu(rec->file.FlNum);
 349                 inode->i_mode = S_IRUGO | S_IXUGO;
 350                 if (!(rec->file.Flags & HFS_FIL_LOCK))
 351                         inode->i_mode |= S_IWUGO;
 352                 inode->i_mode &= ~hsb->s_file_umask;
 353                 inode->i_mode |= S_IFREG;
 354                 inode_set_mtime_to_ts(inode,
 355                                       inode_set_atime_to_ts(inode, inode_set_ctime_to_ts(inode, hfs_m_to_utime(rec->file.MdDat))));
 356                 inode->i_op = &hfs_file_inode_operations;
 357                 inode->i_fop = &hfs_file_operations;
 358                 inode->i_mapping->a_ops = &hfs_aops;
 359                 break;
 360         case HFS_CDR_DIR:
 361                 inode->i_ino = be32_to_cpu(rec->dir.DirID);
 362                 inode->i_size = be16_to_cpu(rec->dir.Val) + 2;
 363                 HFS_I(inode)->fs_blocks = 0;
 364                 inode->i_mode = S_IFDIR | (S_IRWXUGO & ~hsb->s_dir_umask);
 365                 inode_set_mtime_to_ts(inode,
 366                                       inode_set_atime_to_ts(inode, inode_set_ctime_to_ts(inode, hfs_m_to_utime(rec->dir.MdDat))));
 367                 inode->i_op = &hfs_dir_inode_operations;
 368                 inode->i_fop = &hfs_dir_operations;
 369                 break;
 370         default:
 371                 make_bad_inode(inode);
 372         }
 373         return 0;
 374 }
 375
 376 /*
 377  * __hfs_iget()
 378  *
 379  * Given the MDB for a HFS filesystem, a 'key' and an 'entry' in
 380  * the catalog B-tree and the 'type' of the desired file return the
 381  * inode for that file/directory or NULL.  Note that 'type' indicates
 382  * whether we want the actual file or directory, or the corresponding
 383  * metadata (AppleDouble header file or CAP metadata file).
 384  */
 385 struct inode *hfs_iget(struct super_block *sb, struct hfs_cat_key *key, hfs_cat_rec *rec)
 386 {
 387         struct hfs_iget_data data = { key, rec };
 388         struct inode *inode;
 389         u32 cnid;
 390
 391         switch (rec->type) {
 392         case HFS_CDR_DIR:
 393                 cnid = be32_to_cpu(rec->dir.DirID);
 394                 break;
 395         case HFS_CDR_FIL:
 396                 cnid = be32_to_cpu(rec->file.FlNum);
 397                 break;
 398         default:
 399                 return NULL;
 400         }
 401         inode = iget5_locked(sb, cnid, hfs_test_inode, hfs_read_inode, &data);
 402         if (inode && (inode->i_state & I_NEW))
 403                 unlock_new_inode(inode);
 404         return inode;
 405 }
 406
 407 void hfs_inode_write_fork(struct inode *inode, struct hfs_extent *ext,
 408                           __be32 *log_size, __be32 *phys_size)
 409 {
 410         memcpy(ext, HFS_I(inode)->first_extents, sizeof(hfs_extent_rec));
 411
 412         if (log_size)
 413                 *log_size = cpu_to_be32(inode->i_size);
 414         if (phys_size)
 415                 *phys_size = cpu_to_be32(HFS_I(inode)->alloc_blocks *
 416                                          HFS_SB(inode->i_sb)->alloc_blksz);
 417 }
 418
 419 int hfs_write_inode(struct inode *inode, struct writeback_control *wbc)
 420 {
 421         struct inode *main_inode = inode;
 422         struct hfs_find_data fd;
 423         hfs_cat_rec rec;
 424         int res;
 425
 426         hfs_dbg(INODE, "hfs_write_inode: %lu\n", inode->i_ino);
 427         res = hfs_ext_write_extent(inode);
 428         if (res)
 429                 return res;
 430
 431         if (inode->i_ino < HFS_FIRSTUSER_CNID) {
 432                 switch (inode->i_ino) {
 433                 case HFS_ROOT_CNID:
 434                         break;
 435                 case HFS_EXT_CNID:
 436                         hfs_btree_write(HFS_SB(inode->i_sb)->ext_tree);
 437                         return 0;
 438                 case HFS_CAT_CNID:
 439                         hfs_btree_write(HFS_SB(inode->i_sb)->cat_tree);
 440                         return 0;
 441                 default:
 442                         BUG();
 443                         return -EIO;
 444                 }
 445         }
 446
 447         if (HFS_IS_RSRC(inode))
 448                 main_inode = HFS_I(inode)->rsrc_inode;
 449
 450         if (!main_inode->i_nlink)
 451                 return 0;
 452
 453         if (hfs_find_init(HFS_SB(main_inode->i_sb)->cat_tree, &fd))
 454                 /* panic? */
 455                 return -EIO;
 456
 457         res = -EIO;
 458         if (HFS_I(main_inode)->cat_key.CName.len > HFS_NAMELEN)
 459                 goto out;
 460         fd.search_key->cat = HFS_I(main_inode)->cat_key;
 461         if (hfs_brec_find(&fd))
 462                 goto out;
 463
 464         if (S_ISDIR(main_inode->i_mode)) {
 465                 if (fd.entrylength < sizeof(struct hfs_cat_dir))
 466                         goto out;
 467                 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
 468                            sizeof(struct hfs_cat_dir));
 469                 if (rec.type != HFS_CDR_DIR ||
 470                     be32_to_cpu(rec.dir.DirID) != inode->i_ino) {
 471                 }
 472
 473                 rec.dir.MdDat = hfs_u_to_mtime(inode_get_mtime(inode));
 474                 rec.dir.Val = cpu_to_be16(inode->i_size - 2);
 475
 476                 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
 477                             sizeof(struct hfs_cat_dir));
 478         } else if (HFS_IS_RSRC(inode)) {
 479                 if (fd.entrylength < sizeof(struct hfs_cat_file))
 480                         goto out;
 481                 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
 482                                sizeof(struct hfs_cat_file));
 483                 hfs_inode_write_fork(inode, rec.file.RExtRec,
 484                                      &rec.file.RLgLen, &rec.file.RPyLen);
 485                 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
 486                                 sizeof(struct hfs_cat_file));
 487         } else {
 488                 if (fd.entrylength < sizeof(struct hfs_cat_file))
 489                         goto out;
 490                 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
 491                            sizeof(struct hfs_cat_file));
 492                 if (rec.type != HFS_CDR_FIL ||
 493                     be32_to_cpu(rec.file.FlNum) != inode->i_ino) {
 494                 }
 495
 496                 if (inode->i_mode & S_IWUSR)
 497                         rec.file.Flags &= ~HFS_FIL_LOCK;
 498                 else
 499                         rec.file.Flags |= HFS_FIL_LOCK;
 500                 hfs_inode_write_fork(inode, rec.file.ExtRec, &rec.file.LgLen, &rec.file.PyLen);
 501                 rec.file.MdDat = hfs_u_to_mtime(inode_get_mtime(inode));
 502
 503                 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
 504                             sizeof(struct hfs_cat_file));
 505         }
 506         res = 0;
 507 out:
 508         hfs_find_exit(&fd);
 509         return res;
 510 }
 511
 512 static struct dentry *hfs_file_lookup(struct inode *dir, struct dentry *dentry,
 513                                       unsigned int flags)
 514 {
 515         struct inode *inode = NULL;
 516         hfs_cat_rec rec;
 517         struct hfs_find_data fd;
 518         int res;
 519
 520         if (HFS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc"))
 521                 goto out;
 522
 523         inode = HFS_I(dir)->rsrc_inode;
 524         if (inode)
 525                 goto out;
 526
 527         inode = new_inode(dir->i_sb);
 528         if (!inode)
 529                 return ERR_PTR(-ENOMEM);
 530
 531         res = hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd);
 532         if (res) {
 533                 iput(inode);
 534                 return ERR_PTR(res);
 535         }
 536         fd.search_key->cat = HFS_I(dir)->cat_key;
 537         res = hfs_brec_read(&fd, &rec, sizeof(rec));
 538         if (!res) {
 539                 struct hfs_iget_data idata = { NULL, &rec };
 540                 hfs_read_inode(inode, &idata);
 541         }
 542         hfs_find_exit(&fd);
 543         if (res) {
 544                 iput(inode);
 545                 return ERR_PTR(res);
 546         }
 547         HFS_I(inode)->rsrc_inode = dir;
 548         HFS_I(dir)->rsrc_inode = inode;
 549         igrab(dir);
 550         inode_fake_hash(inode);
 551         mark_inode_dirty(inode);
 552         dont_mount(dentry);
 553 out:
 554         return d_splice_alias(inode, dentry);
 555 }
 556
 557 void hfs_evict_inode(struct inode *inode)
 558 {
 559         truncate_inode_pages_final(&inode->i_data);
 560         clear_inode(inode);
 561         if (HFS_IS_RSRC(inode) && HFS_I(inode)->rsrc_inode) {
 562                 HFS_I(HFS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
 563                 iput(HFS_I(inode)->rsrc_inode);
 564         }
 565 }
 566
 567 static int hfs_file_open(struct inode *inode, struct file *file)
 568 {
 569         if (HFS_IS_RSRC(inode))
 570                 inode = HFS_I(inode)->rsrc_inode;
 571         atomic_inc(&HFS_I(inode)->opencnt);
 572         return 0;
 573 }
 574
 575 static int hfs_file_release(struct inode *inode, struct file *file)
 576 {
 577         //struct super_block *sb = inode->i_sb;
 578
 579         if (HFS_IS_RSRC(inode))
 580                 inode = HFS_I(inode)->rsrc_inode;
 581         if (atomic_dec_and_test(&HFS_I(inode)->opencnt)) {
 582                 inode_lock(inode);
 583                 hfs_file_truncate(inode);
 584                 //if (inode->i_flags & S_DEAD) {
 585                 //      hfs_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
 586                 //      hfs_delete_inode(inode);
 587                 //}
 588                 inode_unlock(inode);
 589         }
 590         return 0;
 591 }
 592
 593 /*
 594  * hfs_notify_change()
 595  *
 596  * Based very closely on fs/msdos/inode.c by Werner Almesberger
 597  *
 598  * This is the notify_change() field in the super_operations structure
 599  * for HFS file systems.  The purpose is to take that changes made to
 600  * an inode and apply then in a filesystem-dependent manner.  In this
 601  * case the process has a few of tasks to do:
 602  *  1) prevent changes to the i_uid and i_gid fields.
 603  *  2) map file permissions to the closest allowable permissions
 604  *  3) Since multiple Linux files can share the same on-disk inode under
 605  *     HFS (for instance the data and resource forks of a file) a change
 606  *     to permissions must be applied to all other in-core inodes which
 607  *     correspond to the same HFS file.
 608  */
 609
 610 int hfs_inode_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
 611                       struct iattr *attr)
 612 {
 613         struct inode *inode = d_inode(dentry);
 614         struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
 615         int error;
 616
 617         error = setattr_prepare(&nop_mnt_idmap, dentry,
 618                                 attr); /* basic permission checks */
 619         if (error)
 620                 return error;
 621
 622         /* no uig/gid changes and limit which mode bits can be set */
 623         if (((attr->ia_valid & ATTR_UID) &&
 624              (!uid_eq(attr->ia_uid, hsb->s_uid))) ||
 625             ((attr->ia_valid & ATTR_GID) &&
 626              (!gid_eq(attr->ia_gid, hsb->s_gid))) ||
 627             ((attr->ia_valid & ATTR_MODE) &&
 628              ((S_ISDIR(inode->i_mode) &&
 629                (attr->ia_mode != inode->i_mode)) ||
 630               (attr->ia_mode & ~HFS_VALID_MODE_BITS)))) {
 631                 return hsb->s_quiet ? 0 : error;
 632         }
 633
 634         if (attr->ia_valid & ATTR_MODE) {
 635                 /* Only the 'w' bits can ever change and only all together. */
 636                 if (attr->ia_mode & S_IWUSR)
 637                         attr->ia_mode = inode->i_mode | S_IWUGO;
 638                 else
 639                         attr->ia_mode = inode->i_mode & ~S_IWUGO;
 640                 attr->ia_mode &= S_ISDIR(inode->i_mode) ? ~hsb->s_dir_umask: ~hsb->s_file_umask;
 641         }
 642
 643         if ((attr->ia_valid & ATTR_SIZE) &&
 644             attr->ia_size != i_size_read(inode)) {
 645                 inode_dio_wait(inode);
 646
 647                 error = inode_newsize_ok(inode, attr->ia_size);
 648                 if (error)
 649                         return error;
 650
 651                 truncate_setsize(inode, attr->ia_size);
 652                 hfs_file_truncate(inode);
 653                 simple_inode_init_ts(inode);
 654         }
 655
 656         setattr_copy(&nop_mnt_idmap, inode, attr);
 657         mark_inode_dirty(inode);
 658         return 0;
 659 }
 660
 661 static int hfs_file_fsync(struct file *filp, loff_t start, loff_t end,
 662                           int datasync)
 663 {
 664         struct inode *inode = filp->f_mapping->host;
 665         struct super_block * sb;
 666         int ret, err;
 667
 668         ret = file_write_and_wait_range(filp, start, end);
 669         if (ret)
 670                 return ret;
 671         inode_lock(inode);
 672
 673         /* sync the inode to buffers */
 674         ret = write_inode_now(inode, 0);
 675
 676         /* sync the superblock to buffers */
 677         sb = inode->i_sb;
 678         flush_delayed_work(&HFS_SB(sb)->mdb_work);
 679         /* .. finally sync the buffers to disk */
 680         err = sync_blockdev(sb->s_bdev);
 681         if (!ret)
 682                 ret = err;
 683         inode_unlock(inode);
 684         return ret;
 685 }
 686
 687 static const struct file_operations hfs_file_operations = {
 688         .llseek         = generic_file_llseek,
 689         .read_iter      = generic_file_read_iter,
 690         .write_iter     = generic_file_write_iter,
 691         .mmap           = generic_file_mmap,
 692         .splice_read    = filemap_splice_read,
 693         .fsync          = hfs_file_fsync,
 694         .open           = hfs_file_open,
 695         .release        = hfs_file_release,
 696 };
 697
 698 static const struct inode_operations hfs_file_inode_operations = {
 699         .lookup         = hfs_file_lookup,
 700         .setattr        = hfs_inode_setattr,
 701         .listxattr      = generic_listxattr,
 702 };