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Merge git://git.infradead.org/users/willy/linux-nvme
[linux-2.6/cjktty.git] / fs / hfs / inode.c
blob3031dfdd2358b21a4ba3d6fafdf68c41c7db86f7
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
21 static const struct file_operations hfs_file_operations;
22 static 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
28 static int hfs_writepage(struct page *page, struct writeback_control *wbc)
29 {
30 return block_write_full_page(page, hfs_get_block, wbc);
31 }
32
33 static int hfs_readpage(struct file *file, struct page *page)
34 {
35 return block_read_full_page(page, hfs_get_block);
36 }
37
38 static void hfs_write_failed(struct address_space *mapping, loff_t to)
39 {
40 struct inode *inode = mapping->host;
41
42 if (to > inode->i_size) {
43 truncate_pagecache(inode, to, inode->i_size);
44 hfs_file_truncate(inode);
45 }
46 }
47
48 static int hfs_write_begin(struct file *file, struct address_space *mapping,
49 loff_t pos, unsigned len, unsigned flags,
50 struct page **pagep, void **fsdata)
51 {
52 int ret;
53
54 *pagep = NULL;
55 ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
56 hfs_get_block,
57 &HFS_I(mapping->host)->phys_size);
58 if (unlikely(ret))
59 hfs_write_failed(mapping, pos + len);
60
61 return ret;
62 }
63
64 static sector_t hfs_bmap(struct address_space *mapping, sector_t block)
65 {
66 return generic_block_bmap(mapping, block, hfs_get_block);
67 }
68
69 static int hfs_releasepage(struct page *page, gfp_t mask)
70 {
71 struct inode *inode = page->mapping->host;
72 struct super_block *sb = inode->i_sb;
73 struct hfs_btree *tree;
74 struct hfs_bnode *node;
75 u32 nidx;
76 int i, res = 1;
77
78 switch (inode->i_ino) {
79 case HFS_EXT_CNID:
80 tree = HFS_SB(sb)->ext_tree;
81 break;
82 case HFS_CAT_CNID:
83 tree = HFS_SB(sb)->cat_tree;
84 break;
85 default:
86 BUG();
87 return 0;
88 }
89
90 if (!tree)
91 return 0;
92
93 if (tree->node_size >= PAGE_CACHE_SIZE) {
94 nidx = page->index >> (tree->node_size_shift - PAGE_CACHE_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 = 0;
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 = page->index << (PAGE_CACHE_SHIFT - tree->node_size_shift);
108 i = 1 << (PAGE_CACHE_SHIFT - tree->node_size_shift);
109 spin_lock(&tree->hash_lock);
110 do {
111 node = hfs_bnode_findhash(tree, nidx++);
112 if (!node)
113 continue;
114 if (atomic_read(&node->refcnt)) {
115 res = 0;
116 break;
117 }
118 hfs_bnode_unhash(node);
119 hfs_bnode_free(node);
120 } while (--i && nidx < tree->node_count);
121 spin_unlock(&tree->hash_lock);
122 }
123 return res ? try_to_free_buffers(page) : 0;
124 }
125
126 static ssize_t hfs_direct_IO(int rw, struct kiocb *iocb,
127 const struct iovec *iov, loff_t offset, unsigned long nr_segs)
128 {
129 struct file *file = iocb->ki_filp;
130 struct address_space *mapping = file->f_mapping;
131 struct inode *inode = file_inode(file)->i_mapping->host;
132 ssize_t ret;
133
134 ret = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs,
135 hfs_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((rw & WRITE) && ret < 0)) {
142 loff_t isize = i_size_read(inode);
143 loff_t end = offset + iov_length(iov, nr_segs);
144
145 if (end > isize)
146 hfs_write_failed(mapping, end);
147 }
148
149 return ret;
150 }
151
152 static int hfs_writepages(struct address_space *mapping,
153 struct writeback_control *wbc)
154 {
155 return mpage_writepages(mapping, wbc, hfs_get_block);
156 }
157
158 const struct address_space_operations hfs_btree_aops = {
159 .readpage = hfs_readpage,
160 .writepage = hfs_writepage,
161 .write_begin = hfs_write_begin,
162 .write_end = generic_write_end,
163 .bmap = hfs_bmap,
164 .releasepage = hfs_releasepage,
165 };
166
167 const struct address_space_operations hfs_aops = {
168 .readpage = hfs_readpage,
169 .writepage = hfs_writepage,
170 .write_begin = hfs_write_begin,
171 .write_end = generic_write_end,
172 .bmap = hfs_bmap,
173 .direct_IO = hfs_direct_IO,
174 .writepages = hfs_writepages,
175 };
176
177 /*
178 * hfs_new_inode
179 */
180 struct inode *hfs_new_inode(struct inode *dir, struct qstr *name, umode_t mode)
181 {
182 struct super_block *sb = dir->i_sb;
183 struct inode *inode = new_inode(sb);
184 if (!inode)
185 return NULL;
186
187 mutex_init(&HFS_I(inode)->extents_lock);
188 INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
189 hfs_cat_build_key(sb, (btree_key *)&HFS_I(inode)->cat_key, dir->i_ino, name);
190 inode->i_ino = HFS_SB(sb)->next_id++;
191 inode->i_mode = mode;
192 inode->i_uid = current_fsuid();
193 inode->i_gid = current_fsgid();
194 set_nlink(inode, 1);
195 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
196 HFS_I(inode)->flags = 0;
197 HFS_I(inode)->rsrc_inode = NULL;
198 HFS_I(inode)->fs_blocks = 0;
199 if (S_ISDIR(mode)) {
200 inode->i_size = 2;
201 HFS_SB(sb)->folder_count++;
202 if (dir->i_ino == HFS_ROOT_CNID)
203 HFS_SB(sb)->root_dirs++;
204 inode->i_op = &hfs_dir_inode_operations;
205 inode->i_fop = &hfs_dir_operations;
206 inode->i_mode |= S_IRWXUGO;
207 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_dir_umask;
208 } else if (S_ISREG(mode)) {
209 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
210 HFS_SB(sb)->file_count++;
211 if (dir->i_ino == HFS_ROOT_CNID)
212 HFS_SB(sb)->root_files++;
213 inode->i_op = &hfs_file_inode_operations;
214 inode->i_fop = &hfs_file_operations;
215 inode->i_mapping->a_ops = &hfs_aops;
216 inode->i_mode |= S_IRUGO|S_IXUGO;
217 if (mode & S_IWUSR)
218 inode->i_mode |= S_IWUGO;
219 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_file_umask;
220 HFS_I(inode)->phys_size = 0;
221 HFS_I(inode)->alloc_blocks = 0;
222 HFS_I(inode)->first_blocks = 0;
223 HFS_I(inode)->cached_start = 0;
224 HFS_I(inode)->cached_blocks = 0;
225 memset(HFS_I(inode)->first_extents, 0, sizeof(hfs_extent_rec));
226 memset(HFS_I(inode)->cached_extents, 0, sizeof(hfs_extent_rec));
227 }
228 insert_inode_hash(inode);
229 mark_inode_dirty(inode);
230 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
231 hfs_mark_mdb_dirty(sb);
232
233 return inode;
234 }
235
236 void hfs_delete_inode(struct inode *inode)
237 {
238 struct super_block *sb = inode->i_sb;
239
240 dprint(DBG_INODE, "delete_inode: %lu\n", inode->i_ino);
241 if (S_ISDIR(inode->i_mode)) {
242 HFS_SB(sb)->folder_count--;
243 if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
244 HFS_SB(sb)->root_dirs--;
245 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
246 hfs_mark_mdb_dirty(sb);
247 return;
248 }
249 HFS_SB(sb)->file_count--;
250 if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
251 HFS_SB(sb)->root_files--;
252 if (S_ISREG(inode->i_mode)) {
253 if (!inode->i_nlink) {
254 inode->i_size = 0;
255 hfs_file_truncate(inode);
256 }
257 }
258 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
259 hfs_mark_mdb_dirty(sb);
260 }
261
262 void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext,
263 __be32 __log_size, __be32 phys_size, u32 clump_size)
264 {
265 struct super_block *sb = inode->i_sb;
266 u32 log_size = be32_to_cpu(__log_size);
267 u16 count;
268 int i;
269
270 memcpy(HFS_I(inode)->first_extents, ext, sizeof(hfs_extent_rec));
271 for (count = 0, i = 0; i < 3; i++)
272 count += be16_to_cpu(ext[i].count);
273 HFS_I(inode)->first_blocks = count;
274
275 inode->i_size = HFS_I(inode)->phys_size = log_size;
276 HFS_I(inode)->fs_blocks = (log_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
277 inode_set_bytes(inode, HFS_I(inode)->fs_blocks << sb->s_blocksize_bits);
278 HFS_I(inode)->alloc_blocks = be32_to_cpu(phys_size) /
279 HFS_SB(sb)->alloc_blksz;
280 HFS_I(inode)->clump_blocks = clump_size / HFS_SB(sb)->alloc_blksz;
281 if (!HFS_I(inode)->clump_blocks)
282 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
283 }
284
285 struct hfs_iget_data {
286 struct hfs_cat_key *key;
287 hfs_cat_rec *rec;
288 };
289
290 static int hfs_test_inode(struct inode *inode, void *data)
291 {
292 struct hfs_iget_data *idata = data;
293 hfs_cat_rec *rec;
294
295 rec = idata->rec;
296 switch (rec->type) {
297 case HFS_CDR_DIR:
298 return inode->i_ino == be32_to_cpu(rec->dir.DirID);
299 case HFS_CDR_FIL:
300 return inode->i_ino == be32_to_cpu(rec->file.FlNum);
301 default:
302 BUG();
303 return 1;
304 }
305 }
306
307 /*
308 * hfs_read_inode
309 */
310 static int hfs_read_inode(struct inode *inode, void *data)
311 {
312 struct hfs_iget_data *idata = data;
313 struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
314 hfs_cat_rec *rec;
315
316 HFS_I(inode)->flags = 0;
317 HFS_I(inode)->rsrc_inode = NULL;
318 mutex_init(&HFS_I(inode)->extents_lock);
319 INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
320
321 /* Initialize the inode */
322 inode->i_uid = hsb->s_uid;
323 inode->i_gid = hsb->s_gid;
324 set_nlink(inode, 1);
325
326 if (idata->key)
327 HFS_I(inode)->cat_key = *idata->key;
328 else
329 HFS_I(inode)->flags |= HFS_FLG_RSRC;
330 HFS_I(inode)->tz_secondswest = sys_tz.tz_minuteswest * 60;
331
332 rec = idata->rec;
333 switch (rec->type) {
334 case HFS_CDR_FIL:
335 if (!HFS_IS_RSRC(inode)) {
336 hfs_inode_read_fork(inode, rec->file.ExtRec, rec->file.LgLen,
337 rec->file.PyLen, be16_to_cpu(rec->file.ClpSize));
338 } else {
339 hfs_inode_read_fork(inode, rec->file.RExtRec, rec->file.RLgLen,
340 rec->file.RPyLen, be16_to_cpu(rec->file.ClpSize));
341 }
342
343 inode->i_ino = be32_to_cpu(rec->file.FlNum);
344 inode->i_mode = S_IRUGO | S_IXUGO;
345 if (!(rec->file.Flags & HFS_FIL_LOCK))
346 inode->i_mode |= S_IWUGO;
347 inode->i_mode &= ~hsb->s_file_umask;
348 inode->i_mode |= S_IFREG;
349 inode->i_ctime = inode->i_atime = inode->i_mtime =
350 hfs_m_to_utime(rec->file.MdDat);
351 inode->i_op = &hfs_file_inode_operations;
352 inode->i_fop = &hfs_file_operations;
353 inode->i_mapping->a_ops = &hfs_aops;
354 break;
355 case HFS_CDR_DIR:
356 inode->i_ino = be32_to_cpu(rec->dir.DirID);
357 inode->i_size = be16_to_cpu(rec->dir.Val) + 2;
358 HFS_I(inode)->fs_blocks = 0;
359 inode->i_mode = S_IFDIR | (S_IRWXUGO & ~hsb->s_dir_umask);
360 inode->i_ctime = inode->i_atime = inode->i_mtime =
361 hfs_m_to_utime(rec->dir.MdDat);
362 inode->i_op = &hfs_dir_inode_operations;
363 inode->i_fop = &hfs_dir_operations;
364 break;
365 default:
366 make_bad_inode(inode);
367 }
368 return 0;
369 }
370
371 /*
372 * __hfs_iget()
373 *
374 * Given the MDB for a HFS filesystem, a 'key' and an 'entry' in
375 * the catalog B-tree and the 'type' of the desired file return the
376 * inode for that file/directory or NULL. Note that 'type' indicates
377 * whether we want the actual file or directory, or the corresponding
378 * metadata (AppleDouble header file or CAP metadata file).
379 */
380 struct inode *hfs_iget(struct super_block *sb, struct hfs_cat_key *key, hfs_cat_rec *rec)
381 {
382 struct hfs_iget_data data = { key, rec };
383 struct inode *inode;
384 u32 cnid;
385
386 switch (rec->type) {
387 case HFS_CDR_DIR:
388 cnid = be32_to_cpu(rec->dir.DirID);
389 break;
390 case HFS_CDR_FIL:
391 cnid = be32_to_cpu(rec->file.FlNum);
392 break;
393 default:
394 return NULL;
395 }
396 inode = iget5_locked(sb, cnid, hfs_test_inode, hfs_read_inode, &data);
397 if (inode && (inode->i_state & I_NEW))
398 unlock_new_inode(inode);
399 return inode;
400 }
401
402 void hfs_inode_write_fork(struct inode *inode, struct hfs_extent *ext,
403 __be32 *log_size, __be32 *phys_size)
404 {
405 memcpy(ext, HFS_I(inode)->first_extents, sizeof(hfs_extent_rec));
406
407 if (log_size)
408 *log_size = cpu_to_be32(inode->i_size);
409 if (phys_size)
410 *phys_size = cpu_to_be32(HFS_I(inode)->alloc_blocks *
411 HFS_SB(inode->i_sb)->alloc_blksz);
412 }
413
414 int hfs_write_inode(struct inode *inode, struct writeback_control *wbc)
415 {
416 struct inode *main_inode = inode;
417 struct hfs_find_data fd;
418 hfs_cat_rec rec;
419
420 dprint(DBG_INODE, "hfs_write_inode: %lu\n", inode->i_ino);
421 hfs_ext_write_extent(inode);
422
423 if (inode->i_ino < HFS_FIRSTUSER_CNID) {
424 switch (inode->i_ino) {
425 case HFS_ROOT_CNID:
426 break;
427 case HFS_EXT_CNID:
428 hfs_btree_write(HFS_SB(inode->i_sb)->ext_tree);
429 return 0;
430 case HFS_CAT_CNID:
431 hfs_btree_write(HFS_SB(inode->i_sb)->cat_tree);
432 return 0;
433 default:
434 BUG();
435 return -EIO;
436 }
437 }
438
439 if (HFS_IS_RSRC(inode))
440 main_inode = HFS_I(inode)->rsrc_inode;
441
442 if (!main_inode->i_nlink)
443 return 0;
444
445 if (hfs_find_init(HFS_SB(main_inode->i_sb)->cat_tree, &fd))
446 /* panic? */
447 return -EIO;
448
449 fd.search_key->cat = HFS_I(main_inode)->cat_key;
450 if (hfs_brec_find(&fd))
451 /* panic? */
452 goto out;
453
454 if (S_ISDIR(main_inode->i_mode)) {
455 if (fd.entrylength < sizeof(struct hfs_cat_dir))
456 /* panic? */;
457 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
458 sizeof(struct hfs_cat_dir));
459 if (rec.type != HFS_CDR_DIR ||
460 be32_to_cpu(rec.dir.DirID) != inode->i_ino) {
461 }
462
463 rec.dir.MdDat = hfs_u_to_mtime(inode->i_mtime);
464 rec.dir.Val = cpu_to_be16(inode->i_size - 2);
465
466 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
467 sizeof(struct hfs_cat_dir));
468 } else if (HFS_IS_RSRC(inode)) {
469 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
470 sizeof(struct hfs_cat_file));
471 hfs_inode_write_fork(inode, rec.file.RExtRec,
472 &rec.file.RLgLen, &rec.file.RPyLen);
473 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
474 sizeof(struct hfs_cat_file));
475 } else {
476 if (fd.entrylength < sizeof(struct hfs_cat_file))
477 /* panic? */;
478 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
479 sizeof(struct hfs_cat_file));
480 if (rec.type != HFS_CDR_FIL ||
481 be32_to_cpu(rec.file.FlNum) != inode->i_ino) {
482 }
483
484 if (inode->i_mode & S_IWUSR)
485 rec.file.Flags &= ~HFS_FIL_LOCK;
486 else
487 rec.file.Flags |= HFS_FIL_LOCK;
488 hfs_inode_write_fork(inode, rec.file.ExtRec, &rec.file.LgLen, &rec.file.PyLen);
489 rec.file.MdDat = hfs_u_to_mtime(inode->i_mtime);
490
491 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
492 sizeof(struct hfs_cat_file));
493 }
494 out:
495 hfs_find_exit(&fd);
496 return 0;
497 }
498
499 static struct dentry *hfs_file_lookup(struct inode *dir, struct dentry *dentry,
500 unsigned int flags)
501 {
502 struct inode *inode = NULL;
503 hfs_cat_rec rec;
504 struct hfs_find_data fd;
505 int res;
506
507 if (HFS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc"))
508 goto out;
509
510 inode = HFS_I(dir)->rsrc_inode;
511 if (inode)
512 goto out;
513
514 inode = new_inode(dir->i_sb);
515 if (!inode)
516 return ERR_PTR(-ENOMEM);
517
518 hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd);
519 fd.search_key->cat = HFS_I(dir)->cat_key;
520 res = hfs_brec_read(&fd, &rec, sizeof(rec));
521 if (!res) {
522 struct hfs_iget_data idata = { NULL, &rec };
523 hfs_read_inode(inode, &idata);
524 }
525 hfs_find_exit(&fd);
526 if (res) {
527 iput(inode);
528 return ERR_PTR(res);
529 }
530 HFS_I(inode)->rsrc_inode = dir;
531 HFS_I(dir)->rsrc_inode = inode;
532 igrab(dir);
533 hlist_add_fake(&inode->i_hash);
534 mark_inode_dirty(inode);
535 out:
536 d_add(dentry, inode);
537 return NULL;
538 }
539
540 void hfs_evict_inode(struct inode *inode)
541 {
542 truncate_inode_pages(&inode->i_data, 0);
543 clear_inode(inode);
544 if (HFS_IS_RSRC(inode) && HFS_I(inode)->rsrc_inode) {
545 HFS_I(HFS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
546 iput(HFS_I(inode)->rsrc_inode);
547 }
548 }
549
550 static int hfs_file_open(struct inode *inode, struct file *file)
551 {
552 if (HFS_IS_RSRC(inode))
553 inode = HFS_I(inode)->rsrc_inode;
554 atomic_inc(&HFS_I(inode)->opencnt);
555 return 0;
556 }
557
558 static int hfs_file_release(struct inode *inode, struct file *file)
559 {
560 //struct super_block *sb = inode->i_sb;
561
562 if (HFS_IS_RSRC(inode))
563 inode = HFS_I(inode)->rsrc_inode;
564 if (atomic_dec_and_test(&HFS_I(inode)->opencnt)) {
565 mutex_lock(&inode->i_mutex);
566 hfs_file_truncate(inode);
567 //if (inode->i_flags & S_DEAD) {
568 // hfs_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
569 // hfs_delete_inode(inode);
570 //}
571 mutex_unlock(&inode->i_mutex);
572 }
573 return 0;
574 }
575
576 /*
577 * hfs_notify_change()
578 *
579 * Based very closely on fs/msdos/inode.c by Werner Almesberger
580 *
581 * This is the notify_change() field in the super_operations structure
582 * for HFS file systems. The purpose is to take that changes made to
583 * an inode and apply then in a filesystem-dependent manner. In this
584 * case the process has a few of tasks to do:
585 * 1) prevent changes to the i_uid and i_gid fields.
586 * 2) map file permissions to the closest allowable permissions
587 * 3) Since multiple Linux files can share the same on-disk inode under
588 * HFS (for instance the data and resource forks of a file) a change
589 * to permissions must be applied to all other in-core inodes which
590 * correspond to the same HFS file.
591 */
592
593 int hfs_inode_setattr(struct dentry *dentry, struct iattr * attr)
594 {
595 struct inode *inode = dentry->d_inode;
596 struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
597 int error;
598
599 error = inode_change_ok(inode, attr); /* basic permission checks */
600 if (error)
601 return error;
602
603 /* no uig/gid changes and limit which mode bits can be set */
604 if (((attr->ia_valid & ATTR_UID) &&
605 (!uid_eq(attr->ia_uid, hsb->s_uid))) ||
606 ((attr->ia_valid & ATTR_GID) &&
607 (!gid_eq(attr->ia_gid, hsb->s_gid))) ||
608 ((attr->ia_valid & ATTR_MODE) &&
609 ((S_ISDIR(inode->i_mode) &&
610 (attr->ia_mode != inode->i_mode)) ||
611 (attr->ia_mode & ~HFS_VALID_MODE_BITS)))) {
612 return hsb->s_quiet ? 0 : error;
613 }
614
615 if (attr->ia_valid & ATTR_MODE) {
616 /* Only the 'w' bits can ever change and only all together. */
617 if (attr->ia_mode & S_IWUSR)
618 attr->ia_mode = inode->i_mode | S_IWUGO;
619 else
620 attr->ia_mode = inode->i_mode & ~S_IWUGO;
621 attr->ia_mode &= S_ISDIR(inode->i_mode) ? ~hsb->s_dir_umask: ~hsb->s_file_umask;
622 }
623
624 if ((attr->ia_valid & ATTR_SIZE) &&
625 attr->ia_size != i_size_read(inode)) {
626 inode_dio_wait(inode);
627
628 error = inode_newsize_ok(inode, attr->ia_size);
629 if (error)
630 return error;
631
632 truncate_setsize(inode, attr->ia_size);
633 hfs_file_truncate(inode);
634 }
635
636 setattr_copy(inode, attr);
637 mark_inode_dirty(inode);
638 return 0;
639 }
640
641 static int hfs_file_fsync(struct file *filp, loff_t start, loff_t end,
642 int datasync)
643 {
644 struct inode *inode = filp->f_mapping->host;
645 struct super_block * sb;
646 int ret, err;
647
648 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
649 if (ret)
650 return ret;
651 mutex_lock(&inode->i_mutex);
652
653 /* sync the inode to buffers */
654 ret = write_inode_now(inode, 0);
655
656 /* sync the superblock to buffers */
657 sb = inode->i_sb;
658 flush_delayed_work(&HFS_SB(sb)->mdb_work);
659 /* .. finally sync the buffers to disk */
660 err = sync_blockdev(sb->s_bdev);
661 if (!ret)
662 ret = err;
663 mutex_unlock(&inode->i_mutex);
664 return ret;
665 }
666
667 static const struct file_operations hfs_file_operations = {
668 .llseek = generic_file_llseek,
669 .read = do_sync_read,
670 .aio_read = generic_file_aio_read,
671 .write = do_sync_write,
672 .aio_write = generic_file_aio_write,
673 .mmap = generic_file_mmap,
674 .splice_read = generic_file_splice_read,
675 .fsync = hfs_file_fsync,
676 .open = hfs_file_open,
677 .release = hfs_file_release,
678 };
679
680 static const struct inode_operations hfs_file_inode_operations = {
681 .lookup = hfs_file_lookup,
682 .setattr = hfs_inode_setattr,
683 .setxattr = hfs_setxattr,
684 .getxattr = hfs_getxattr,
685 .listxattr = hfs_listxattr,
686 };
CJK support for tty framebuffer vt