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TOMOYO Linux Cross Reference
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 #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                 inode_lock(inode);
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                 inode_unlock(inode);
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         inode_lock(inode);
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         inode_unlock(inode);
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 };
693 

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