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