inode.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  linux/fs/hfsplus/inode.c
   4  *
   5  * Copyright (C) 2001
   6  * Brad Boyer (flar@allandria.com)
   7  * (C) 2003 Ardis Technologies <roman@ardistech.com>
   8  *
   9  * Inode handling routines
  10  */
  11
  12 #include <linux/blkdev.h>
  13 #include <linux/mm.h>
  14 #include <linux/fs.h>
  15 #include <linux/pagemap.h>
  16 #include <linux/mpage.h>
  17 #include <linux/sched.h>
  18 #include <linux/cred.h>
  19 #include <linux/uio.h>
  20 #include <linux/fileattr.h>
  21
  22 #include "hfsplus_fs.h"
  23 #include "hfsplus_raw.h"
  24 #include "xattr.h"
  25
  26 static int hfsplus_read_folio(struct file *file, struct folio *folio)
  27 {
  28         return block_read_full_folio(folio, hfsplus_get_block);
  29 }
  30
  31 static int hfsplus_writepage(struct page *page, struct writeback_control *wbc)
  32 {
  33         return block_write_full_page(page, hfsplus_get_block, wbc);
  34 }
  35
  36 static void hfsplus_write_failed(struct address_space *mapping, loff_t to)
  37 {
  38         struct inode *inode = mapping->host;
  39
  40         if (to > inode->i_size) {
  41                 truncate_pagecache(inode, inode->i_size);
  42                 hfsplus_file_truncate(inode);
  43         }
  44 }
  45
  46 int hfsplus_write_begin(struct file *file, struct address_space *mapping,
  47                 loff_t pos, unsigned len, struct page **pagep, void **fsdata)
  48 {
  49         int ret;
  50
  51         *pagep = NULL;
  52         ret = cont_write_begin(file, mapping, pos, len, pagep, fsdata,
  53                                 hfsplus_get_block,
  54                                 &HFSPLUS_I(mapping->host)->phys_size);
  55         if (unlikely(ret))
  56                 hfsplus_write_failed(mapping, pos + len);
  57
  58         return ret;
  59 }
  60
  61 static sector_t hfsplus_bmap(struct address_space *mapping, sector_t block)
  62 {
  63         return generic_block_bmap(mapping, block, hfsplus_get_block);
  64 }
  65
  66 static bool hfsplus_release_folio(struct folio *folio, gfp_t mask)
  67 {
  68         struct inode *inode = folio->mapping->host;
  69         struct super_block *sb = inode->i_sb;
  70         struct hfs_btree *tree;
  71         struct hfs_bnode *node;
  72         u32 nidx;
  73         int i;
  74         bool res = true;
  75
  76         switch (inode->i_ino) {
  77         case HFSPLUS_EXT_CNID:
  78                 tree = HFSPLUS_SB(sb)->ext_tree;
  79                 break;
  80         case HFSPLUS_CAT_CNID:
  81                 tree = HFSPLUS_SB(sb)->cat_tree;
  82                 break;
  83         case HFSPLUS_ATTR_CNID:
  84                 tree = HFSPLUS_SB(sb)->attr_tree;
  85                 break;
  86         default:
  87                 BUG();
  88                 return false;
  89         }
  90         if (!tree)
  91                 return false;
  92         if (tree->node_size >= PAGE_SIZE) {
  93                 nidx = folio->index >>
  94                         (tree->node_size_shift - PAGE_SHIFT);
  95                 spin_lock(&tree->hash_lock);
  96                 node = hfs_bnode_findhash(tree, nidx);
  97                 if (!node)
  98                         ;
  99                 else if (atomic_read(&node->refcnt))
 100                         res = false;
 101                 if (res && node) {
 102                         hfs_bnode_unhash(node);
 103                         hfs_bnode_free(node);
 104                 }
 105                 spin_unlock(&tree->hash_lock);
 106         } else {
 107                 nidx = folio->index <<
 108                         (PAGE_SHIFT - tree->node_size_shift);
 109                 i = 1 << (PAGE_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 = false;
 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(folio) : false;
 125 }
 126
 127 static ssize_t hfsplus_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 128 {
 129         struct file *file = iocb->ki_filp;
 130         struct address_space *mapping = file->f_mapping;
 131         struct inode *inode = mapping->host;
 132         size_t count = iov_iter_count(iter);
 133         ssize_t ret;
 134
 135         ret = blockdev_direct_IO(iocb, inode, iter, hfsplus_get_block);
 136
 137         /*
 138          * In case of error extending write may have instantiated a few
 139          * blocks outside i_size. Trim these off again.
 140          */
 141         if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) {
 142                 loff_t isize = i_size_read(inode);
 143                 loff_t end = iocb->ki_pos + count;
 144
 145                 if (end > isize)
 146                         hfsplus_write_failed(mapping, end);
 147         }
 148
 149         return ret;
 150 }
 151
 152 static int hfsplus_writepages(struct address_space *mapping,
 153                               struct writeback_control *wbc)
 154 {
 155         return mpage_writepages(mapping, wbc, hfsplus_get_block);
 156 }
 157
 158 const struct address_space_operations hfsplus_btree_aops = {
 159         .dirty_folio    = block_dirty_folio,
 160         .invalidate_folio = block_invalidate_folio,
 161         .read_folio     = hfsplus_read_folio,
 162         .writepage      = hfsplus_writepage,
 163         .write_begin    = hfsplus_write_begin,
 164         .write_end      = generic_write_end,
 165         .bmap           = hfsplus_bmap,
 166         .release_folio  = hfsplus_release_folio,
 167 };
 168
 169 const struct address_space_operations hfsplus_aops = {
 170         .dirty_folio    = block_dirty_folio,
 171         .invalidate_folio = block_invalidate_folio,
 172         .read_folio     = hfsplus_read_folio,
 173         .writepage      = hfsplus_writepage,
 174         .write_begin    = hfsplus_write_begin,
 175         .write_end      = generic_write_end,
 176         .bmap           = hfsplus_bmap,
 177         .direct_IO      = hfsplus_direct_IO,
 178         .writepages     = hfsplus_writepages,
 179 };
 180
 181 const struct dentry_operations hfsplus_dentry_operations = {
 182         .d_hash       = hfsplus_hash_dentry,
 183         .d_compare    = hfsplus_compare_dentry,
 184 };
 185
 186 static void hfsplus_get_perms(struct inode *inode,
 187                 struct hfsplus_perm *perms, int dir)
 188 {
 189         struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
 190         u16 mode;
 191
 192         mode = be16_to_cpu(perms->mode);
 193
 194         i_uid_write(inode, be32_to_cpu(perms->owner));
 195         if ((test_bit(HFSPLUS_SB_UID, &sbi->flags)) || (!i_uid_read(inode) && !mode))
 196                 inode->i_uid = sbi->uid;
 197
 198         i_gid_write(inode, be32_to_cpu(perms->group));
 199         if ((test_bit(HFSPLUS_SB_GID, &sbi->flags)) || (!i_gid_read(inode) && !mode))
 200                 inode->i_gid = sbi->gid;
 201
 202         if (dir) {
 203                 mode = mode ? (mode & S_IALLUGO) : (S_IRWXUGO & ~(sbi->umask));
 204                 mode |= S_IFDIR;
 205         } else if (!mode)
 206                 mode = S_IFREG | ((S_IRUGO|S_IWUGO) & ~(sbi->umask));
 207         inode->i_mode = mode;
 208
 209         HFSPLUS_I(inode)->userflags = perms->userflags;
 210         if (perms->rootflags & HFSPLUS_FLG_IMMUTABLE)
 211                 inode->i_flags |= S_IMMUTABLE;
 212         else
 213                 inode->i_flags &= ~S_IMMUTABLE;
 214         if (perms->rootflags & HFSPLUS_FLG_APPEND)
 215                 inode->i_flags |= S_APPEND;
 216         else
 217                 inode->i_flags &= ~S_APPEND;
 218 }
 219
 220 static int hfsplus_file_open(struct inode *inode, struct file *file)
 221 {
 222         if (HFSPLUS_IS_RSRC(inode))
 223                 inode = HFSPLUS_I(inode)->rsrc_inode;
 224         if (!(file->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS)
 225                 return -EOVERFLOW;
 226         atomic_inc(&HFSPLUS_I(inode)->opencnt);
 227         return 0;
 228 }
 229
 230 static int hfsplus_file_release(struct inode *inode, struct file *file)
 231 {
 232         struct super_block *sb = inode->i_sb;
 233
 234         if (HFSPLUS_IS_RSRC(inode))
 235                 inode = HFSPLUS_I(inode)->rsrc_inode;
 236         if (atomic_dec_and_test(&HFSPLUS_I(inode)->opencnt)) {
 237                 inode_lock(inode);
 238                 hfsplus_file_truncate(inode);
 239                 if (inode->i_flags & S_DEAD) {
 240                         hfsplus_delete_cat(inode->i_ino,
 241                                            HFSPLUS_SB(sb)->hidden_dir, NULL);
 242                         hfsplus_delete_inode(inode);
 243                 }
 244                 inode_unlock(inode);
 245         }
 246         return 0;
 247 }
 248
 249 static int hfsplus_setattr(struct user_namespace *mnt_userns,
 250                            struct dentry *dentry, struct iattr *attr)
 251 {
 252         struct inode *inode = d_inode(dentry);
 253         int error;
 254
 255         error = setattr_prepare(&init_user_ns, dentry, attr);
 256         if (error)
 257                 return error;
 258
 259         if ((attr->ia_valid & ATTR_SIZE) &&
 260             attr->ia_size != i_size_read(inode)) {
 261                 inode_dio_wait(inode);
 262                 if (attr->ia_size > inode->i_size) {
 263                         error = generic_cont_expand_simple(inode,
 264                                                            attr->ia_size);
 265                         if (error)
 266                                 return error;
 267                 }
 268                 truncate_setsize(inode, attr->ia_size);
 269                 hfsplus_file_truncate(inode);
 270                 inode->i_mtime = inode->i_ctime = current_time(inode);
 271         }
 272
 273         setattr_copy(&init_user_ns, inode, attr);
 274         mark_inode_dirty(inode);
 275
 276         return 0;
 277 }
 278
 279 int hfsplus_getattr(struct user_namespace *mnt_userns, const struct path *path,
 280                     struct kstat *stat, u32 request_mask,
 281                     unsigned int query_flags)
 282 {
 283         struct inode *inode = d_inode(path->dentry);
 284         struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
 285
 286         if (request_mask & STATX_BTIME) {
 287                 stat->result_mask |= STATX_BTIME;
 288                 stat->btime = hfsp_mt2ut(hip->create_date);
 289         }
 290
 291         if (inode->i_flags & S_APPEND)
 292                 stat->attributes |= STATX_ATTR_APPEND;
 293         if (inode->i_flags & S_IMMUTABLE)
 294                 stat->attributes |= STATX_ATTR_IMMUTABLE;
 295         if (hip->userflags & HFSPLUS_FLG_NODUMP)
 296                 stat->attributes |= STATX_ATTR_NODUMP;
 297
 298         stat->attributes_mask |= STATX_ATTR_APPEND | STATX_ATTR_IMMUTABLE |
 299                                  STATX_ATTR_NODUMP;
 300
 301         generic_fillattr(&init_user_ns, inode, stat);
 302         return 0;
 303 }
 304
 305 int hfsplus_file_fsync(struct file *file, loff_t start, loff_t end,
 306                        int datasync)
 307 {
 308         struct inode *inode = file->f_mapping->host;
 309         struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
 310         struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
 311         int error = 0, error2;
 312
 313         error = file_write_and_wait_range(file, start, end);
 314         if (error)
 315                 return error;
 316         inode_lock(inode);
 317
 318         /*
 319          * Sync inode metadata into the catalog and extent trees.
 320          */
 321         sync_inode_metadata(inode, 1);
 322
 323         /*
 324          * And explicitly write out the btrees.
 325          */
 326         if (test_and_clear_bit(HFSPLUS_I_CAT_DIRTY, &hip->flags))
 327                 error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping);
 328
 329         if (test_and_clear_bit(HFSPLUS_I_EXT_DIRTY, &hip->flags)) {
 330                 error2 =
 331                         filemap_write_and_wait(sbi->ext_tree->inode->i_mapping);
 332                 if (!error)
 333                         error = error2;
 334         }
 335
 336         if (test_and_clear_bit(HFSPLUS_I_ATTR_DIRTY, &hip->flags)) {
 337                 if (sbi->attr_tree) {
 338                         error2 =
 339                                 filemap_write_and_wait(
 340                                             sbi->attr_tree->inode->i_mapping);
 341                         if (!error)
 342                                 error = error2;
 343                 } else {
 344                         pr_err("sync non-existent attributes tree\n");
 345                 }
 346         }
 347
 348         if (test_and_clear_bit(HFSPLUS_I_ALLOC_DIRTY, &hip->flags)) {
 349                 error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping);
 350                 if (!error)
 351                         error = error2;
 352         }
 353
 354         if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
 355                 blkdev_issue_flush(inode->i_sb->s_bdev);
 356
 357         inode_unlock(inode);
 358
 359         return error;
 360 }
 361
 362 static const struct inode_operations hfsplus_file_inode_operations = {
 363         .setattr        = hfsplus_setattr,
 364         .getattr        = hfsplus_getattr,
 365         .listxattr      = hfsplus_listxattr,
 366         .fileattr_get   = hfsplus_fileattr_get,
 367         .fileattr_set   = hfsplus_fileattr_set,
 368 };
 369
 370 static const struct file_operations hfsplus_file_operations = {
 371         .llseek         = generic_file_llseek,
 372         .read_iter      = generic_file_read_iter,
 373         .write_iter     = generic_file_write_iter,
 374         .mmap           = generic_file_mmap,
 375         .splice_read    = generic_file_splice_read,
 376         .fsync          = hfsplus_file_fsync,
 377         .open           = hfsplus_file_open,
 378         .release        = hfsplus_file_release,
 379         .unlocked_ioctl = hfsplus_ioctl,
 380 };
 381
 382 struct inode *hfsplus_new_inode(struct super_block *sb, struct inode *dir,
 383                                 umode_t mode)
 384 {
 385         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 386         struct inode *inode = new_inode(sb);
 387         struct hfsplus_inode_info *hip;
 388
 389         if (!inode)
 390                 return NULL;
 391
 392         inode->i_ino = sbi->next_cnid++;
 393         inode_init_owner(&init_user_ns, inode, dir, mode);
 394         set_nlink(inode, 1);
 395         inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
 396
 397         hip = HFSPLUS_I(inode);
 398         INIT_LIST_HEAD(&hip->open_dir_list);
 399         spin_lock_init(&hip->open_dir_lock);
 400         mutex_init(&hip->extents_lock);
 401         atomic_set(&hip->opencnt, 0);
 402         hip->extent_state = 0;
 403         hip->flags = 0;
 404         hip->userflags = 0;
 405         hip->subfolders = 0;
 406         memset(hip->first_extents, 0, sizeof(hfsplus_extent_rec));
 407         memset(hip->cached_extents, 0, sizeof(hfsplus_extent_rec));
 408         hip->alloc_blocks = 0;
 409         hip->first_blocks = 0;
 410         hip->cached_start = 0;
 411         hip->cached_blocks = 0;
 412         hip->phys_size = 0;
 413         hip->fs_blocks = 0;
 414         hip->rsrc_inode = NULL;
 415         if (S_ISDIR(inode->i_mode)) {
 416                 inode->i_size = 2;
 417                 sbi->folder_count++;
 418                 inode->i_op = &hfsplus_dir_inode_operations;
 419                 inode->i_fop = &hfsplus_dir_operations;
 420         } else if (S_ISREG(inode->i_mode)) {
 421                 sbi->file_count++;
 422                 inode->i_op = &hfsplus_file_inode_operations;
 423                 inode->i_fop = &hfsplus_file_operations;
 424                 inode->i_mapping->a_ops = &hfsplus_aops;
 425                 hip->clump_blocks = sbi->data_clump_blocks;
 426         } else if (S_ISLNK(inode->i_mode)) {
 427                 sbi->file_count++;
 428                 inode->i_op = &page_symlink_inode_operations;
 429                 inode_nohighmem(inode);
 430                 inode->i_mapping->a_ops = &hfsplus_aops;
 431                 hip->clump_blocks = 1;
 432         } else
 433                 sbi->file_count++;
 434         insert_inode_hash(inode);
 435         mark_inode_dirty(inode);
 436         hfsplus_mark_mdb_dirty(sb);
 437
 438         return inode;
 439 }
 440
 441 void hfsplus_delete_inode(struct inode *inode)
 442 {
 443         struct super_block *sb = inode->i_sb;
 444
 445         if (S_ISDIR(inode->i_mode)) {
 446                 HFSPLUS_SB(sb)->folder_count--;
 447                 hfsplus_mark_mdb_dirty(sb);
 448                 return;
 449         }
 450         HFSPLUS_SB(sb)->file_count--;
 451         if (S_ISREG(inode->i_mode)) {
 452                 if (!inode->i_nlink) {
 453                         inode->i_size = 0;
 454                         hfsplus_file_truncate(inode);
 455                 }
 456         } else if (S_ISLNK(inode->i_mode)) {
 457                 inode->i_size = 0;
 458                 hfsplus_file_truncate(inode);
 459         }
 460         hfsplus_mark_mdb_dirty(sb);
 461 }
 462
 463 void hfsplus_inode_read_fork(struct inode *inode, struct hfsplus_fork_raw *fork)
 464 {
 465         struct super_block *sb = inode->i_sb;
 466         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 467         struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
 468         u32 count;
 469         int i;
 470
 471         memcpy(&hip->first_extents, &fork->extents, sizeof(hfsplus_extent_rec));
 472         for (count = 0, i = 0; i < 8; i++)
 473                 count += be32_to_cpu(fork->extents[i].block_count);
 474         hip->first_blocks = count;
 475         memset(hip->cached_extents, 0, sizeof(hfsplus_extent_rec));
 476         hip->cached_start = 0;
 477         hip->cached_blocks = 0;
 478
 479         hip->alloc_blocks = be32_to_cpu(fork->total_blocks);
 480         hip->phys_size = inode->i_size = be64_to_cpu(fork->total_size);
 481         hip->fs_blocks =
 482                 (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
 483         inode_set_bytes(inode, hip->fs_blocks << sb->s_blocksize_bits);
 484         hip->clump_blocks =
 485                 be32_to_cpu(fork->clump_size) >> sbi->alloc_blksz_shift;
 486         if (!hip->clump_blocks) {
 487                 hip->clump_blocks = HFSPLUS_IS_RSRC(inode) ?
 488                         sbi->rsrc_clump_blocks :
 489                         sbi->data_clump_blocks;
 490         }
 491 }
 492
 493 void hfsplus_inode_write_fork(struct inode *inode,
 494                 struct hfsplus_fork_raw *fork)
 495 {
 496         memcpy(&fork->extents, &HFSPLUS_I(inode)->first_extents,
 497                sizeof(hfsplus_extent_rec));
 498         fork->total_size = cpu_to_be64(inode->i_size);
 499         fork->total_blocks = cpu_to_be32(HFSPLUS_I(inode)->alloc_blocks);
 500 }
 501
 502 int hfsplus_cat_read_inode(struct inode *inode, struct hfs_find_data *fd)
 503 {
 504         hfsplus_cat_entry entry;
 505         int res = 0;
 506         u16 type;
 507
 508         type = hfs_bnode_read_u16(fd->bnode, fd->entryoffset);
 509
 510         HFSPLUS_I(inode)->linkid = 0;
 511         if (type == HFSPLUS_FOLDER) {
 512                 struct hfsplus_cat_folder *folder = &entry.folder;
 513
 514                 if (fd->entrylength < sizeof(struct hfsplus_cat_folder)) {
 515                         pr_err("bad catalog folder entry\n");
 516                         res = -EIO;
 517                         goto out;
 518                 }
 519                 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset,
 520                                         sizeof(struct hfsplus_cat_folder));
 521                 hfsplus_get_perms(inode, &folder->permissions, 1);
 522                 set_nlink(inode, 1);
 523                 inode->i_size = 2 + be32_to_cpu(folder->valence);
 524                 inode->i_atime = hfsp_mt2ut(folder->access_date);
 525                 inode->i_mtime = hfsp_mt2ut(folder->content_mod_date);
 526                 inode->i_ctime = hfsp_mt2ut(folder->attribute_mod_date);
 527                 HFSPLUS_I(inode)->create_date = folder->create_date;
 528                 HFSPLUS_I(inode)->fs_blocks = 0;
 529                 if (folder->flags & cpu_to_be16(HFSPLUS_HAS_FOLDER_COUNT)) {
 530                         HFSPLUS_I(inode)->subfolders =
 531                                 be32_to_cpu(folder->subfolders);
 532                 }
 533                 inode->i_op = &hfsplus_dir_inode_operations;
 534                 inode->i_fop = &hfsplus_dir_operations;
 535         } else if (type == HFSPLUS_FILE) {
 536                 struct hfsplus_cat_file *file = &entry.file;
 537
 538                 if (fd->entrylength < sizeof(struct hfsplus_cat_file)) {
 539                         pr_err("bad catalog file entry\n");
 540                         res = -EIO;
 541                         goto out;
 542                 }
 543                 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset,
 544                                         sizeof(struct hfsplus_cat_file));
 545
 546                 hfsplus_inode_read_fork(inode, HFSPLUS_IS_RSRC(inode) ?
 547                                         &file->rsrc_fork : &file->data_fork);
 548                 hfsplus_get_perms(inode, &file->permissions, 0);
 549                 set_nlink(inode, 1);
 550                 if (S_ISREG(inode->i_mode)) {
 551                         if (file->permissions.dev)
 552                                 set_nlink(inode,
 553                                           be32_to_cpu(file->permissions.dev));
 554                         inode->i_op = &hfsplus_file_inode_operations;
 555                         inode->i_fop = &hfsplus_file_operations;
 556                         inode->i_mapping->a_ops = &hfsplus_aops;
 557                 } else if (S_ISLNK(inode->i_mode)) {
 558                         inode->i_op = &page_symlink_inode_operations;
 559                         inode_nohighmem(inode);
 560                         inode->i_mapping->a_ops = &hfsplus_aops;
 561                 } else {
 562                         init_special_inode(inode, inode->i_mode,
 563                                            be32_to_cpu(file->permissions.dev));
 564                 }
 565                 inode->i_atime = hfsp_mt2ut(file->access_date);
 566                 inode->i_mtime = hfsp_mt2ut(file->content_mod_date);
 567                 inode->i_ctime = hfsp_mt2ut(file->attribute_mod_date);
 568                 HFSPLUS_I(inode)->create_date = file->create_date;
 569         } else {
 570                 pr_err("bad catalog entry used to create inode\n");
 571                 res = -EIO;
 572         }
 573 out:
 574         return res;
 575 }
 576
 577 int hfsplus_cat_write_inode(struct inode *inode)
 578 {
 579         struct inode *main_inode = inode;
 580         struct hfs_find_data fd;
 581         hfsplus_cat_entry entry;
 582         int res = 0;
 583
 584         if (HFSPLUS_IS_RSRC(inode))
 585                 main_inode = HFSPLUS_I(inode)->rsrc_inode;
 586
 587         if (!main_inode->i_nlink)
 588                 return 0;
 589
 590         if (hfs_find_init(HFSPLUS_SB(main_inode->i_sb)->cat_tree, &fd))
 591                 /* panic? */
 592                 return -EIO;
 593
 594         if (hfsplus_find_cat(main_inode->i_sb, main_inode->i_ino, &fd))
 595                 /* panic? */
 596                 goto out;
 597
 598         if (S_ISDIR(main_inode->i_mode)) {
 599                 struct hfsplus_cat_folder *folder = &entry.folder;
 600
 601                 if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) {
 602                         pr_err("bad catalog folder entry\n");
 603                         res = -EIO;
 604                         goto out;
 605                 }
 606                 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
 607                                         sizeof(struct hfsplus_cat_folder));
 608                 /* simple node checks? */
 609                 hfsplus_cat_set_perms(inode, &folder->permissions);
 610                 folder->access_date = hfsp_ut2mt(inode->i_atime);
 611                 folder->content_mod_date = hfsp_ut2mt(inode->i_mtime);
 612                 folder->attribute_mod_date = hfsp_ut2mt(inode->i_ctime);
 613                 folder->valence = cpu_to_be32(inode->i_size - 2);
 614                 if (folder->flags & cpu_to_be16(HFSPLUS_HAS_FOLDER_COUNT)) {
 615                         folder->subfolders =
 616                                 cpu_to_be32(HFSPLUS_I(inode)->subfolders);
 617                 }
 618                 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
 619                                          sizeof(struct hfsplus_cat_folder));
 620         } else if (HFSPLUS_IS_RSRC(inode)) {
 621                 struct hfsplus_cat_file *file = &entry.file;
 622                 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
 623                                sizeof(struct hfsplus_cat_file));
 624                 hfsplus_inode_write_fork(inode, &file->rsrc_fork);
 625                 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
 626                                 sizeof(struct hfsplus_cat_file));
 627         } else {
 628                 struct hfsplus_cat_file *file = &entry.file;
 629
 630                 if (fd.entrylength < sizeof(struct hfsplus_cat_file)) {
 631                         pr_err("bad catalog file entry\n");
 632                         res = -EIO;
 633                         goto out;
 634                 }
 635                 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
 636                                         sizeof(struct hfsplus_cat_file));
 637                 hfsplus_inode_write_fork(inode, &file->data_fork);
 638                 hfsplus_cat_set_perms(inode, &file->permissions);
 639                 if (HFSPLUS_FLG_IMMUTABLE &
 640                                 (file->permissions.rootflags |
 641                                         file->permissions.userflags))
 642                         file->flags |= cpu_to_be16(HFSPLUS_FILE_LOCKED);
 643                 else
 644                         file->flags &= cpu_to_be16(~HFSPLUS_FILE_LOCKED);
 645                 file->access_date = hfsp_ut2mt(inode->i_atime);
 646                 file->content_mod_date = hfsp_ut2mt(inode->i_mtime);
 647                 file->attribute_mod_date = hfsp_ut2mt(inode->i_ctime);
 648                 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
 649                                          sizeof(struct hfsplus_cat_file));
 650         }
 651
 652         set_bit(HFSPLUS_I_CAT_DIRTY, &HFSPLUS_I(inode)->flags);
 653 out:
 654         hfs_find_exit(&fd);
 655         return res;
 656 }
 657
 658 int hfsplus_fileattr_get(struct dentry *dentry, struct fileattr *fa)
 659 {
 660         struct inode *inode = d_inode(dentry);
 661         struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
 662         unsigned int flags = 0;
 663
 664         if (inode->i_flags & S_IMMUTABLE)
 665                 flags |= FS_IMMUTABLE_FL;
 666         if (inode->i_flags & S_APPEND)
 667                 flags |= FS_APPEND_FL;
 668         if (hip->userflags & HFSPLUS_FLG_NODUMP)
 669                 flags |= FS_NODUMP_FL;
 670
 671         fileattr_fill_flags(fa, flags);
 672
 673         return 0;
 674 }
 675
 676 int hfsplus_fileattr_set(struct user_namespace *mnt_userns,
 677                          struct dentry *dentry, struct fileattr *fa)
 678 {
 679         struct inode *inode = d_inode(dentry);
 680         struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
 681         unsigned int new_fl = 0;
 682
 683         if (fileattr_has_fsx(fa))
 684                 return -EOPNOTSUPP;
 685
 686         /* don't silently ignore unsupported ext2 flags */
 687         if (fa->flags & ~(FS_IMMUTABLE_FL|FS_APPEND_FL|FS_NODUMP_FL))
 688                 return -EOPNOTSUPP;
 689
 690         if (fa->flags & FS_IMMUTABLE_FL)
 691                 new_fl |= S_IMMUTABLE;
 692
 693         if (fa->flags & FS_APPEND_FL)
 694                 new_fl |= S_APPEND;
 695
 696         inode_set_flags(inode, new_fl, S_IMMUTABLE | S_APPEND);
 697
 698         if (fa->flags & FS_NODUMP_FL)
 699                 hip->userflags |= HFSPLUS_FLG_NODUMP;
 700         else
 701                 hip->userflags &= ~HFSPLUS_FLG_NODUMP;
 702
 703         inode->i_ctime = current_time(inode);
 704         mark_inode_dirty(inode);
 705
 706         return 0;
 707 }