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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/aio.h>
18
19#include "hfs_fs.h"
20#include "btree.h"
21
22static const struct file_operations hfs_file_operations;
23static 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
29static int hfs_writepage(struct page *page, struct writeback_control *wbc)
30{
31 return block_write_full_page(page, hfs_get_block, wbc);
32}
33
34static int hfs_readpage(struct file *file, struct page *page)
35{
36 return block_read_full_page(page, hfs_get_block);
37}
38
39static 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
49static 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
65static sector_t hfs_bmap(struct address_space *mapping, sector_t block)
66{
67 return generic_block_bmap(mapping, block, hfs_get_block);
68}
69
70static 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
127static ssize_t hfs_direct_IO(int rw, struct kiocb *iocb,
128 const struct iovec *iov, loff_t offset, unsigned long nr_segs)
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 ssize_t ret;
134
135 ret = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs,
136 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((rw & WRITE) && ret < 0)) {
143 loff_t isize = i_size_read(inode);
144 loff_t end = offset + iov_length(iov, nr_segs);
145
146 if (end > isize)
147 hfs_write_failed(mapping, end);
148 }
149
150 return ret;
151}
152
153static int hfs_writepages(struct address_space *mapping,
154 struct writeback_control *wbc)
155{
156 return mpage_writepages(mapping, wbc, hfs_get_block);
157}
158
159const 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
168const 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 */
181struct 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
237void 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
263void 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
286struct hfs_iget_data {
287 struct hfs_cat_key *key;
288 hfs_cat_rec *rec;
289};
290
291static 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 */
311static 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 */
381struct 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
403void 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
415int 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 }
498out:
499 hfs_find_exit(&fd);
500 return 0;
501}
502
503static 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);
543out:
544 d_add(dentry, inode);
545 return NULL;
546}
547
548void 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
558static 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
566static 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 mutex_lock(&inode->i_mutex);
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 mutex_unlock(&inode->i_mutex);
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
601int hfs_inode_setattr(struct dentry *dentry, struct iattr * attr)
602{
603 struct inode *inode = dentry->d_inode;
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
649static 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 mutex_lock(&inode->i_mutex);
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 mutex_unlock(&inode->i_mutex);
672 return ret;
673}
674
675static const struct file_operations hfs_file_operations = {
676 .llseek = generic_file_llseek,
677 .read = do_sync_read,
678 .aio_read = generic_file_aio_read,
679 .write = do_sync_write,
680 .aio_write = generic_file_aio_write,
681 .mmap = generic_file_mmap,
682 .splice_read = generic_file_splice_read,
683 .fsync = hfs_file_fsync,
684 .open = hfs_file_open,
685 .release = hfs_file_release,
686};
687
688static const struct inode_operations hfs_file_inode_operations = {
689 .lookup = hfs_file_lookup,
690 .setattr = hfs_inode_setattr,
691 .setxattr = hfs_setxattr,
692 .getxattr = hfs_getxattr,
693 .listxattr = hfs_listxattr,
694};
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
25static const struct file_operations hfs_file_operations;
26static 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
32static int hfs_writepage(struct page *page, struct writeback_control *wbc)
33{
34 return block_write_full_page(page, hfs_get_block, wbc);
35}
36
37static int hfs_readpage(struct file *file, struct page *page)
38{
39 return block_read_full_page(page, hfs_get_block);
40}
41
42static 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
52static 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
68static sector_t hfs_bmap(struct address_space *mapping, sector_t block)
69{
70 return generic_block_bmap(mapping, block, hfs_get_block);
71}
72
73static 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
130static 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
155static int hfs_writepages(struct address_space *mapping,
156 struct writeback_control *wbc)
157{
158 return mpage_writepages(mapping, wbc, hfs_get_block);
159}
160
161const struct address_space_operations hfs_btree_aops = {
162 .set_page_dirty = __set_page_dirty_buffers,
163 .readpage = hfs_readpage,
164 .writepage = hfs_writepage,
165 .write_begin = hfs_write_begin,
166 .write_end = generic_write_end,
167 .bmap = hfs_bmap,
168 .releasepage = hfs_releasepage,
169};
170
171const struct address_space_operations hfs_aops = {
172 .set_page_dirty = __set_page_dirty_buffers,
173 .readpage = hfs_readpage,
174 .writepage = hfs_writepage,
175 .write_begin = hfs_write_begin,
176 .write_end = generic_write_end,
177 .bmap = hfs_bmap,
178 .direct_IO = hfs_direct_IO,
179 .writepages = hfs_writepages,
180};
181
182/*
183 * hfs_new_inode
184 */
185struct inode *hfs_new_inode(struct inode *dir, const struct qstr *name, umode_t mode)
186{
187 struct super_block *sb = dir->i_sb;
188 struct inode *inode = new_inode(sb);
189 if (!inode)
190 return NULL;
191
192 mutex_init(&HFS_I(inode)->extents_lock);
193 INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
194 spin_lock_init(&HFS_I(inode)->open_dir_lock);
195 hfs_cat_build_key(sb, (btree_key *)&HFS_I(inode)->cat_key, dir->i_ino, name);
196 inode->i_ino = HFS_SB(sb)->next_id++;
197 inode->i_mode = mode;
198 inode->i_uid = current_fsuid();
199 inode->i_gid = current_fsgid();
200 set_nlink(inode, 1);
201 inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
202 HFS_I(inode)->flags = 0;
203 HFS_I(inode)->rsrc_inode = NULL;
204 HFS_I(inode)->fs_blocks = 0;
205 if (S_ISDIR(mode)) {
206 inode->i_size = 2;
207 HFS_SB(sb)->folder_count++;
208 if (dir->i_ino == HFS_ROOT_CNID)
209 HFS_SB(sb)->root_dirs++;
210 inode->i_op = &hfs_dir_inode_operations;
211 inode->i_fop = &hfs_dir_operations;
212 inode->i_mode |= S_IRWXUGO;
213 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_dir_umask;
214 } else if (S_ISREG(mode)) {
215 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
216 HFS_SB(sb)->file_count++;
217 if (dir->i_ino == HFS_ROOT_CNID)
218 HFS_SB(sb)->root_files++;
219 inode->i_op = &hfs_file_inode_operations;
220 inode->i_fop = &hfs_file_operations;
221 inode->i_mapping->a_ops = &hfs_aops;
222 inode->i_mode |= S_IRUGO|S_IXUGO;
223 if (mode & S_IWUSR)
224 inode->i_mode |= S_IWUGO;
225 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_file_umask;
226 HFS_I(inode)->phys_size = 0;
227 HFS_I(inode)->alloc_blocks = 0;
228 HFS_I(inode)->first_blocks = 0;
229 HFS_I(inode)->cached_start = 0;
230 HFS_I(inode)->cached_blocks = 0;
231 memset(HFS_I(inode)->first_extents, 0, sizeof(hfs_extent_rec));
232 memset(HFS_I(inode)->cached_extents, 0, sizeof(hfs_extent_rec));
233 }
234 insert_inode_hash(inode);
235 mark_inode_dirty(inode);
236 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
237 hfs_mark_mdb_dirty(sb);
238
239 return inode;
240}
241
242void hfs_delete_inode(struct inode *inode)
243{
244 struct super_block *sb = inode->i_sb;
245
246 hfs_dbg(INODE, "delete_inode: %lu\n", inode->i_ino);
247 if (S_ISDIR(inode->i_mode)) {
248 HFS_SB(sb)->folder_count--;
249 if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
250 HFS_SB(sb)->root_dirs--;
251 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
252 hfs_mark_mdb_dirty(sb);
253 return;
254 }
255 HFS_SB(sb)->file_count--;
256 if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
257 HFS_SB(sb)->root_files--;
258 if (S_ISREG(inode->i_mode)) {
259 if (!inode->i_nlink) {
260 inode->i_size = 0;
261 hfs_file_truncate(inode);
262 }
263 }
264 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
265 hfs_mark_mdb_dirty(sb);
266}
267
268void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext,
269 __be32 __log_size, __be32 phys_size, u32 clump_size)
270{
271 struct super_block *sb = inode->i_sb;
272 u32 log_size = be32_to_cpu(__log_size);
273 u16 count;
274 int i;
275
276 memcpy(HFS_I(inode)->first_extents, ext, sizeof(hfs_extent_rec));
277 for (count = 0, i = 0; i < 3; i++)
278 count += be16_to_cpu(ext[i].count);
279 HFS_I(inode)->first_blocks = count;
280
281 inode->i_size = HFS_I(inode)->phys_size = log_size;
282 HFS_I(inode)->fs_blocks = (log_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
283 inode_set_bytes(inode, HFS_I(inode)->fs_blocks << sb->s_blocksize_bits);
284 HFS_I(inode)->alloc_blocks = be32_to_cpu(phys_size) /
285 HFS_SB(sb)->alloc_blksz;
286 HFS_I(inode)->clump_blocks = clump_size / HFS_SB(sb)->alloc_blksz;
287 if (!HFS_I(inode)->clump_blocks)
288 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
289}
290
291struct hfs_iget_data {
292 struct hfs_cat_key *key;
293 hfs_cat_rec *rec;
294};
295
296static int hfs_test_inode(struct inode *inode, void *data)
297{
298 struct hfs_iget_data *idata = data;
299 hfs_cat_rec *rec;
300
301 rec = idata->rec;
302 switch (rec->type) {
303 case HFS_CDR_DIR:
304 return inode->i_ino == be32_to_cpu(rec->dir.DirID);
305 case HFS_CDR_FIL:
306 return inode->i_ino == be32_to_cpu(rec->file.FlNum);
307 default:
308 BUG();
309 return 1;
310 }
311}
312
313/*
314 * hfs_read_inode
315 */
316static int hfs_read_inode(struct inode *inode, void *data)
317{
318 struct hfs_iget_data *idata = data;
319 struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
320 hfs_cat_rec *rec;
321
322 HFS_I(inode)->flags = 0;
323 HFS_I(inode)->rsrc_inode = NULL;
324 mutex_init(&HFS_I(inode)->extents_lock);
325 INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
326 spin_lock_init(&HFS_I(inode)->open_dir_lock);
327
328 /* Initialize the inode */
329 inode->i_uid = hsb->s_uid;
330 inode->i_gid = hsb->s_gid;
331 set_nlink(inode, 1);
332
333 if (idata->key)
334 HFS_I(inode)->cat_key = *idata->key;
335 else
336 HFS_I(inode)->flags |= HFS_FLG_RSRC;
337 HFS_I(inode)->tz_secondswest = sys_tz.tz_minuteswest * 60;
338
339 rec = idata->rec;
340 switch (rec->type) {
341 case HFS_CDR_FIL:
342 if (!HFS_IS_RSRC(inode)) {
343 hfs_inode_read_fork(inode, rec->file.ExtRec, rec->file.LgLen,
344 rec->file.PyLen, be16_to_cpu(rec->file.ClpSize));
345 } else {
346 hfs_inode_read_fork(inode, rec->file.RExtRec, rec->file.RLgLen,
347 rec->file.RPyLen, be16_to_cpu(rec->file.ClpSize));
348 }
349
350 inode->i_ino = be32_to_cpu(rec->file.FlNum);
351 inode->i_mode = S_IRUGO | S_IXUGO;
352 if (!(rec->file.Flags & HFS_FIL_LOCK))
353 inode->i_mode |= S_IWUGO;
354 inode->i_mode &= ~hsb->s_file_umask;
355 inode->i_mode |= S_IFREG;
356 inode->i_ctime = inode->i_atime = inode->i_mtime =
357 hfs_m_to_utime(rec->file.MdDat);
358 inode->i_op = &hfs_file_inode_operations;
359 inode->i_fop = &hfs_file_operations;
360 inode->i_mapping->a_ops = &hfs_aops;
361 break;
362 case HFS_CDR_DIR:
363 inode->i_ino = be32_to_cpu(rec->dir.DirID);
364 inode->i_size = be16_to_cpu(rec->dir.Val) + 2;
365 HFS_I(inode)->fs_blocks = 0;
366 inode->i_mode = S_IFDIR | (S_IRWXUGO & ~hsb->s_dir_umask);
367 inode->i_ctime = inode->i_atime = inode->i_mtime =
368 hfs_m_to_utime(rec->dir.MdDat);
369 inode->i_op = &hfs_dir_inode_operations;
370 inode->i_fop = &hfs_dir_operations;
371 break;
372 default:
373 make_bad_inode(inode);
374 }
375 return 0;
376}
377
378/*
379 * __hfs_iget()
380 *
381 * Given the MDB for a HFS filesystem, a 'key' and an 'entry' in
382 * the catalog B-tree and the 'type' of the desired file return the
383 * inode for that file/directory or NULL. Note that 'type' indicates
384 * whether we want the actual file or directory, or the corresponding
385 * metadata (AppleDouble header file or CAP metadata file).
386 */
387struct inode *hfs_iget(struct super_block *sb, struct hfs_cat_key *key, hfs_cat_rec *rec)
388{
389 struct hfs_iget_data data = { key, rec };
390 struct inode *inode;
391 u32 cnid;
392
393 switch (rec->type) {
394 case HFS_CDR_DIR:
395 cnid = be32_to_cpu(rec->dir.DirID);
396 break;
397 case HFS_CDR_FIL:
398 cnid = be32_to_cpu(rec->file.FlNum);
399 break;
400 default:
401 return NULL;
402 }
403 inode = iget5_locked(sb, cnid, hfs_test_inode, hfs_read_inode, &data);
404 if (inode && (inode->i_state & I_NEW))
405 unlock_new_inode(inode);
406 return inode;
407}
408
409void hfs_inode_write_fork(struct inode *inode, struct hfs_extent *ext,
410 __be32 *log_size, __be32 *phys_size)
411{
412 memcpy(ext, HFS_I(inode)->first_extents, sizeof(hfs_extent_rec));
413
414 if (log_size)
415 *log_size = cpu_to_be32(inode->i_size);
416 if (phys_size)
417 *phys_size = cpu_to_be32(HFS_I(inode)->alloc_blocks *
418 HFS_SB(inode->i_sb)->alloc_blksz);
419}
420
421int hfs_write_inode(struct inode *inode, struct writeback_control *wbc)
422{
423 struct inode *main_inode = inode;
424 struct hfs_find_data fd;
425 hfs_cat_rec rec;
426 int res;
427
428 hfs_dbg(INODE, "hfs_write_inode: %lu\n", inode->i_ino);
429 res = hfs_ext_write_extent(inode);
430 if (res)
431 return res;
432
433 if (inode->i_ino < HFS_FIRSTUSER_CNID) {
434 switch (inode->i_ino) {
435 case HFS_ROOT_CNID:
436 break;
437 case HFS_EXT_CNID:
438 hfs_btree_write(HFS_SB(inode->i_sb)->ext_tree);
439 return 0;
440 case HFS_CAT_CNID:
441 hfs_btree_write(HFS_SB(inode->i_sb)->cat_tree);
442 return 0;
443 default:
444 BUG();
445 return -EIO;
446 }
447 }
448
449 if (HFS_IS_RSRC(inode))
450 main_inode = HFS_I(inode)->rsrc_inode;
451
452 if (!main_inode->i_nlink)
453 return 0;
454
455 if (hfs_find_init(HFS_SB(main_inode->i_sb)->cat_tree, &fd))
456 /* panic? */
457 return -EIO;
458
459 fd.search_key->cat = HFS_I(main_inode)->cat_key;
460 if (hfs_brec_find(&fd))
461 /* panic? */
462 goto out;
463
464 if (S_ISDIR(main_inode->i_mode)) {
465 if (fd.entrylength < sizeof(struct hfs_cat_dir))
466 /* panic? */;
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 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
480 sizeof(struct hfs_cat_file));
481 hfs_inode_write_fork(inode, rec.file.RExtRec,
482 &rec.file.RLgLen, &rec.file.RPyLen);
483 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
484 sizeof(struct hfs_cat_file));
485 } else {
486 if (fd.entrylength < sizeof(struct hfs_cat_file))
487 /* panic? */;
488 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
489 sizeof(struct hfs_cat_file));
490 if (rec.type != HFS_CDR_FIL ||
491 be32_to_cpu(rec.file.FlNum) != inode->i_ino) {
492 }
493
494 if (inode->i_mode & S_IWUSR)
495 rec.file.Flags &= ~HFS_FIL_LOCK;
496 else
497 rec.file.Flags |= HFS_FIL_LOCK;
498 hfs_inode_write_fork(inode, rec.file.ExtRec, &rec.file.LgLen, &rec.file.PyLen);
499 rec.file.MdDat = hfs_u_to_mtime(inode->i_mtime);
500
501 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
502 sizeof(struct hfs_cat_file));
503 }
504out:
505 hfs_find_exit(&fd);
506 return 0;
507}
508
509static struct dentry *hfs_file_lookup(struct inode *dir, struct dentry *dentry,
510 unsigned int flags)
511{
512 struct inode *inode = NULL;
513 hfs_cat_rec rec;
514 struct hfs_find_data fd;
515 int res;
516
517 if (HFS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc"))
518 goto out;
519
520 inode = HFS_I(dir)->rsrc_inode;
521 if (inode)
522 goto out;
523
524 inode = new_inode(dir->i_sb);
525 if (!inode)
526 return ERR_PTR(-ENOMEM);
527
528 res = hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd);
529 if (res) {
530 iput(inode);
531 return ERR_PTR(res);
532 }
533 fd.search_key->cat = HFS_I(dir)->cat_key;
534 res = hfs_brec_read(&fd, &rec, sizeof(rec));
535 if (!res) {
536 struct hfs_iget_data idata = { NULL, &rec };
537 hfs_read_inode(inode, &idata);
538 }
539 hfs_find_exit(&fd);
540 if (res) {
541 iput(inode);
542 return ERR_PTR(res);
543 }
544 HFS_I(inode)->rsrc_inode = dir;
545 HFS_I(dir)->rsrc_inode = inode;
546 igrab(dir);
547 inode_fake_hash(inode);
548 mark_inode_dirty(inode);
549 dont_mount(dentry);
550out:
551 return d_splice_alias(inode, dentry);
552}
553
554void hfs_evict_inode(struct inode *inode)
555{
556 truncate_inode_pages_final(&inode->i_data);
557 clear_inode(inode);
558 if (HFS_IS_RSRC(inode) && HFS_I(inode)->rsrc_inode) {
559 HFS_I(HFS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
560 iput(HFS_I(inode)->rsrc_inode);
561 }
562}
563
564static int hfs_file_open(struct inode *inode, struct file *file)
565{
566 if (HFS_IS_RSRC(inode))
567 inode = HFS_I(inode)->rsrc_inode;
568 atomic_inc(&HFS_I(inode)->opencnt);
569 return 0;
570}
571
572static int hfs_file_release(struct inode *inode, struct file *file)
573{
574 //struct super_block *sb = inode->i_sb;
575
576 if (HFS_IS_RSRC(inode))
577 inode = HFS_I(inode)->rsrc_inode;
578 if (atomic_dec_and_test(&HFS_I(inode)->opencnt)) {
579 inode_lock(inode);
580 hfs_file_truncate(inode);
581 //if (inode->i_flags & S_DEAD) {
582 // hfs_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
583 // hfs_delete_inode(inode);
584 //}
585 inode_unlock(inode);
586 }
587 return 0;
588}
589
590/*
591 * hfs_notify_change()
592 *
593 * Based very closely on fs/msdos/inode.c by Werner Almesberger
594 *
595 * This is the notify_change() field in the super_operations structure
596 * for HFS file systems. The purpose is to take that changes made to
597 * an inode and apply then in a filesystem-dependent manner. In this
598 * case the process has a few of tasks to do:
599 * 1) prevent changes to the i_uid and i_gid fields.
600 * 2) map file permissions to the closest allowable permissions
601 * 3) Since multiple Linux files can share the same on-disk inode under
602 * HFS (for instance the data and resource forks of a file) a change
603 * to permissions must be applied to all other in-core inodes which
604 * correspond to the same HFS file.
605 */
606
607int hfs_inode_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
608 struct iattr *attr)
609{
610 struct inode *inode = d_inode(dentry);
611 struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
612 int error;
613
614 error = setattr_prepare(&init_user_ns, dentry,
615 attr); /* basic permission checks */
616 if (error)
617 return error;
618
619 /* no uig/gid changes and limit which mode bits can be set */
620 if (((attr->ia_valid & ATTR_UID) &&
621 (!uid_eq(attr->ia_uid, hsb->s_uid))) ||
622 ((attr->ia_valid & ATTR_GID) &&
623 (!gid_eq(attr->ia_gid, hsb->s_gid))) ||
624 ((attr->ia_valid & ATTR_MODE) &&
625 ((S_ISDIR(inode->i_mode) &&
626 (attr->ia_mode != inode->i_mode)) ||
627 (attr->ia_mode & ~HFS_VALID_MODE_BITS)))) {
628 return hsb->s_quiet ? 0 : error;
629 }
630
631 if (attr->ia_valid & ATTR_MODE) {
632 /* Only the 'w' bits can ever change and only all together. */
633 if (attr->ia_mode & S_IWUSR)
634 attr->ia_mode = inode->i_mode | S_IWUGO;
635 else
636 attr->ia_mode = inode->i_mode & ~S_IWUGO;
637 attr->ia_mode &= S_ISDIR(inode->i_mode) ? ~hsb->s_dir_umask: ~hsb->s_file_umask;
638 }
639
640 if ((attr->ia_valid & ATTR_SIZE) &&
641 attr->ia_size != i_size_read(inode)) {
642 inode_dio_wait(inode);
643
644 error = inode_newsize_ok(inode, attr->ia_size);
645 if (error)
646 return error;
647
648 truncate_setsize(inode, attr->ia_size);
649 hfs_file_truncate(inode);
650 inode->i_atime = inode->i_mtime = inode->i_ctime =
651 current_time(inode);
652 }
653
654 setattr_copy(&init_user_ns, inode, attr);
655 mark_inode_dirty(inode);
656 return 0;
657}
658
659static int hfs_file_fsync(struct file *filp, loff_t start, loff_t end,
660 int datasync)
661{
662 struct inode *inode = filp->f_mapping->host;
663 struct super_block * sb;
664 int ret, err;
665
666 ret = file_write_and_wait_range(filp, start, end);
667 if (ret)
668 return ret;
669 inode_lock(inode);
670
671 /* sync the inode to buffers */
672 ret = write_inode_now(inode, 0);
673
674 /* sync the superblock to buffers */
675 sb = inode->i_sb;
676 flush_delayed_work(&HFS_SB(sb)->mdb_work);
677 /* .. finally sync the buffers to disk */
678 err = sync_blockdev(sb->s_bdev);
679 if (!ret)
680 ret = err;
681 inode_unlock(inode);
682 return ret;
683}
684
685static const struct file_operations hfs_file_operations = {
686 .llseek = generic_file_llseek,
687 .read_iter = generic_file_read_iter,
688 .write_iter = generic_file_write_iter,
689 .mmap = generic_file_mmap,
690 .splice_read = generic_file_splice_read,
691 .fsync = hfs_file_fsync,
692 .open = hfs_file_open,
693 .release = hfs_file_release,
694};
695
696static const struct inode_operations hfs_file_inode_operations = {
697 .lookup = hfs_file_lookup,
698 .setattr = hfs_inode_setattr,
699 .listxattr = generic_listxattr,
700};