GNU Linux-libre 5.10.219-gnu1
[releases.git] / 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_writepage(struct page *page, struct writeback_control *wbc)
33 {
34         return block_write_full_page(page, hfs_get_block, wbc);
35 }
36
37 static int hfs_readpage(struct file *file, struct page *page)
38 {
39         return block_read_full_page(page, hfs_get_block);
40 }
41
42 static void hfs_write_failed(struct address_space *mapping, loff_t to)
43 {
44         struct inode *inode = mapping->host;
45
46         if (to > inode->i_size) {
47                 truncate_pagecache(inode, inode->i_size);
48                 hfs_file_truncate(inode);
49         }
50 }
51
52 static int hfs_write_begin(struct file *file, struct address_space *mapping,
53                         loff_t pos, unsigned len, unsigned flags,
54                         struct page **pagep, void **fsdata)
55 {
56         int ret;
57
58         *pagep = NULL;
59         ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
60                                 hfs_get_block,
61                                 &HFS_I(mapping->host)->phys_size);
62         if (unlikely(ret))
63                 hfs_write_failed(mapping, pos + len);
64
65         return ret;
66 }
67
68 static sector_t hfs_bmap(struct address_space *mapping, sector_t block)
69 {
70         return generic_block_bmap(mapping, block, hfs_get_block);
71 }
72
73 static int hfs_releasepage(struct page *page, gfp_t mask)
74 {
75         struct inode *inode = page->mapping->host;
76         struct super_block *sb = inode->i_sb;
77         struct hfs_btree *tree;
78         struct hfs_bnode *node;
79         u32 nidx;
80         int i, res = 1;
81
82         switch (inode->i_ino) {
83         case HFS_EXT_CNID:
84                 tree = HFS_SB(sb)->ext_tree;
85                 break;
86         case HFS_CAT_CNID:
87                 tree = HFS_SB(sb)->cat_tree;
88                 break;
89         default:
90                 BUG();
91                 return 0;
92         }
93
94         if (!tree)
95                 return 0;
96
97         if (tree->node_size >= PAGE_SIZE) {
98                 nidx = page->index >> (tree->node_size_shift - PAGE_SHIFT);
99                 spin_lock(&tree->hash_lock);
100                 node = hfs_bnode_findhash(tree, nidx);
101                 if (!node)
102                         ;
103                 else if (atomic_read(&node->refcnt))
104                         res = 0;
105                 if (res && node) {
106                         hfs_bnode_unhash(node);
107                         hfs_bnode_free(node);
108                 }
109                 spin_unlock(&tree->hash_lock);
110         } else {
111                 nidx = page->index << (PAGE_SHIFT - tree->node_size_shift);
112                 i = 1 << (PAGE_SHIFT - tree->node_size_shift);
113                 spin_lock(&tree->hash_lock);
114                 do {
115                         node = hfs_bnode_findhash(tree, nidx++);
116                         if (!node)
117                                 continue;
118                         if (atomic_read(&node->refcnt)) {
119                                 res = 0;
120                                 break;
121                         }
122                         hfs_bnode_unhash(node);
123                         hfs_bnode_free(node);
124                 } while (--i && nidx < tree->node_count);
125                 spin_unlock(&tree->hash_lock);
126         }
127         return res ? try_to_free_buffers(page) : 0;
128 }
129
130 static ssize_t hfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
131 {
132         struct file *file = iocb->ki_filp;
133         struct address_space *mapping = file->f_mapping;
134         struct inode *inode = mapping->host;
135         size_t count = iov_iter_count(iter);
136         ssize_t ret;
137
138         ret = blockdev_direct_IO(iocb, inode, iter, hfs_get_block);
139
140         /*
141          * In case of error extending write may have instantiated a few
142          * blocks outside i_size. Trim these off again.
143          */
144         if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) {
145                 loff_t isize = i_size_read(inode);
146                 loff_t end = iocb->ki_pos + count;
147
148                 if (end > isize)
149                         hfs_write_failed(mapping, end);
150         }
151
152         return ret;
153 }
154
155 static int hfs_writepages(struct address_space *mapping,
156                           struct writeback_control *wbc)
157 {
158         return mpage_writepages(mapping, wbc, hfs_get_block);
159 }
160
161 const struct address_space_operations hfs_btree_aops = {
162         .readpage       = hfs_readpage,
163         .writepage      = hfs_writepage,
164         .write_begin    = hfs_write_begin,
165         .write_end      = generic_write_end,
166         .bmap           = hfs_bmap,
167         .releasepage    = hfs_releasepage,
168 };
169
170 const struct address_space_operations hfs_aops = {
171         .readpage       = hfs_readpage,
172         .writepage      = hfs_writepage,
173         .write_begin    = hfs_write_begin,
174         .write_end      = generic_write_end,
175         .bmap           = hfs_bmap,
176         .direct_IO      = hfs_direct_IO,
177         .writepages     = hfs_writepages,
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         inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(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->i_ctime = inode->i_atime = inode->i_mtime =
355                                 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->i_ctime = inode->i_atime = inode->i_mtime =
366                                 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->i_mtime);
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->i_mtime);
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 dentry *dentry, struct iattr * attr)
611 {
612         struct inode *inode = d_inode(dentry);
613         struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
614         int error;
615
616         error = setattr_prepare(dentry, attr); /* basic permission checks */
617         if (error)
618                 return error;
619
620         /* no uig/gid changes and limit which mode bits can be set */
621         if (((attr->ia_valid & ATTR_UID) &&
622              (!uid_eq(attr->ia_uid, hsb->s_uid))) ||
623             ((attr->ia_valid & ATTR_GID) &&
624              (!gid_eq(attr->ia_gid, hsb->s_gid))) ||
625             ((attr->ia_valid & ATTR_MODE) &&
626              ((S_ISDIR(inode->i_mode) &&
627                (attr->ia_mode != inode->i_mode)) ||
628               (attr->ia_mode & ~HFS_VALID_MODE_BITS)))) {
629                 return hsb->s_quiet ? 0 : error;
630         }
631
632         if (attr->ia_valid & ATTR_MODE) {
633                 /* Only the 'w' bits can ever change and only all together. */
634                 if (attr->ia_mode & S_IWUSR)
635                         attr->ia_mode = inode->i_mode | S_IWUGO;
636                 else
637                         attr->ia_mode = inode->i_mode & ~S_IWUGO;
638                 attr->ia_mode &= S_ISDIR(inode->i_mode) ? ~hsb->s_dir_umask: ~hsb->s_file_umask;
639         }
640
641         if ((attr->ia_valid & ATTR_SIZE) &&
642             attr->ia_size != i_size_read(inode)) {
643                 inode_dio_wait(inode);
644
645                 error = inode_newsize_ok(inode, attr->ia_size);
646                 if (error)
647                         return error;
648
649                 truncate_setsize(inode, attr->ia_size);
650                 hfs_file_truncate(inode);
651                 inode->i_atime = inode->i_mtime = inode->i_ctime =
652                                                   current_time(inode);
653         }
654
655         setattr_copy(inode, attr);
656         mark_inode_dirty(inode);
657         return 0;
658 }
659
660 static int hfs_file_fsync(struct file *filp, loff_t start, loff_t end,
661                           int datasync)
662 {
663         struct inode *inode = filp->f_mapping->host;
664         struct super_block * sb;
665         int ret, err;
666
667         ret = file_write_and_wait_range(filp, start, end);
668         if (ret)
669                 return ret;
670         inode_lock(inode);
671
672         /* sync the inode to buffers */
673         ret = write_inode_now(inode, 0);
674
675         /* sync the superblock to buffers */
676         sb = inode->i_sb;
677         flush_delayed_work(&HFS_SB(sb)->mdb_work);
678         /* .. finally sync the buffers to disk */
679         err = sync_blockdev(sb->s_bdev);
680         if (!ret)
681                 ret = err;
682         inode_unlock(inode);
683         return ret;
684 }
685
686 static const struct file_operations hfs_file_operations = {
687         .llseek         = generic_file_llseek,
688         .read_iter      = generic_file_read_iter,
689         .write_iter     = generic_file_write_iter,
690         .mmap           = generic_file_mmap,
691         .splice_read    = generic_file_splice_read,
692         .fsync          = hfs_file_fsync,
693         .open           = hfs_file_open,
694         .release        = hfs_file_release,
695 };
696
697 static const struct inode_operations hfs_file_inode_operations = {
698         .lookup         = hfs_file_lookup,
699         .setattr        = hfs_inode_setattr,
700         .listxattr      = generic_listxattr,
701 };