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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/cred.h>
18#include <linux/uio.h>
19#include <linux/xattr.h>
20
21#include "hfs_fs.h"
22#include "btree.h"
23
24static const struct file_operations hfs_file_operations;
25static const struct inode_operations hfs_file_inode_operations;
26
27/*================ Variable-like macros ================*/
28
29#define HFS_VALID_MODE_BITS (S_IFREG | S_IFDIR | S_IRWXUGO)
30
31static int hfs_writepage(struct page *page, struct writeback_control *wbc)
32{
33 return block_write_full_page(page, hfs_get_block, wbc);
34}
35
36static int hfs_readpage(struct file *file, struct page *page)
37{
38 return block_read_full_page(page, hfs_get_block);
39}
40
41static void hfs_write_failed(struct address_space *mapping, loff_t to)
42{
43 struct inode *inode = mapping->host;
44
45 if (to > inode->i_size) {
46 truncate_pagecache(inode, inode->i_size);
47 hfs_file_truncate(inode);
48 }
49}
50
51static int hfs_write_begin(struct file *file, struct address_space *mapping,
52 loff_t pos, unsigned len, unsigned flags,
53 struct page **pagep, void **fsdata)
54{
55 int ret;
56
57 *pagep = NULL;
58 ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
59 hfs_get_block,
60 &HFS_I(mapping->host)->phys_size);
61 if (unlikely(ret))
62 hfs_write_failed(mapping, pos + len);
63
64 return ret;
65}
66
67static sector_t hfs_bmap(struct address_space *mapping, sector_t block)
68{
69 return generic_block_bmap(mapping, block, hfs_get_block);
70}
71
72static int hfs_releasepage(struct page *page, gfp_t mask)
73{
74 struct inode *inode = page->mapping->host;
75 struct super_block *sb = inode->i_sb;
76 struct hfs_btree *tree;
77 struct hfs_bnode *node;
78 u32 nidx;
79 int i, res = 1;
80
81 switch (inode->i_ino) {
82 case HFS_EXT_CNID:
83 tree = HFS_SB(sb)->ext_tree;
84 break;
85 case HFS_CAT_CNID:
86 tree = HFS_SB(sb)->cat_tree;
87 break;
88 default:
89 BUG();
90 return 0;
91 }
92
93 if (!tree)
94 return 0;
95
96 if (tree->node_size >= PAGE_SIZE) {
97 nidx = page->index >> (tree->node_size_shift - PAGE_SHIFT);
98 spin_lock(&tree->hash_lock);
99 node = hfs_bnode_findhash(tree, nidx);
100 if (!node)
101 ;
102 else if (atomic_read(&node->refcnt))
103 res = 0;
104 if (res && node) {
105 hfs_bnode_unhash(node);
106 hfs_bnode_free(node);
107 }
108 spin_unlock(&tree->hash_lock);
109 } else {
110 nidx = page->index << (PAGE_SHIFT - tree->node_size_shift);
111 i = 1 << (PAGE_SHIFT - tree->node_size_shift);
112 spin_lock(&tree->hash_lock);
113 do {
114 node = hfs_bnode_findhash(tree, nidx++);
115 if (!node)
116 continue;
117 if (atomic_read(&node->refcnt)) {
118 res = 0;
119 break;
120 }
121 hfs_bnode_unhash(node);
122 hfs_bnode_free(node);
123 } while (--i && nidx < tree->node_count);
124 spin_unlock(&tree->hash_lock);
125 }
126 return res ? try_to_free_buffers(page) : 0;
127}
128
129static ssize_t hfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
130{
131 struct file *file = iocb->ki_filp;
132 struct address_space *mapping = file->f_mapping;
133 struct inode *inode = mapping->host;
134 size_t count = iov_iter_count(iter);
135 ssize_t ret;
136
137 ret = blockdev_direct_IO(iocb, inode, iter, hfs_get_block);
138
139 /*
140 * In case of error extending write may have instantiated a few
141 * blocks outside i_size. Trim these off again.
142 */
143 if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) {
144 loff_t isize = i_size_read(inode);
145 loff_t end = iocb->ki_pos + count;
146
147 if (end > isize)
148 hfs_write_failed(mapping, end);
149 }
150
151 return ret;
152}
153
154static int hfs_writepages(struct address_space *mapping,
155 struct writeback_control *wbc)
156{
157 return mpage_writepages(mapping, wbc, hfs_get_block);
158}
159
160const struct address_space_operations hfs_btree_aops = {
161 .readpage = hfs_readpage,
162 .writepage = hfs_writepage,
163 .write_begin = hfs_write_begin,
164 .write_end = generic_write_end,
165 .bmap = hfs_bmap,
166 .releasepage = hfs_releasepage,
167};
168
169const struct address_space_operations hfs_aops = {
170 .readpage = hfs_readpage,
171 .writepage = hfs_writepage,
172 .write_begin = hfs_write_begin,
173 .write_end = generic_write_end,
174 .bmap = hfs_bmap,
175 .direct_IO = hfs_direct_IO,
176 .writepages = hfs_writepages,
177};
178
179/*
180 * hfs_new_inode
181 */
182struct inode *hfs_new_inode(struct inode *dir, const struct qstr *name, umode_t mode)
183{
184 struct super_block *sb = dir->i_sb;
185 struct inode *inode = new_inode(sb);
186 if (!inode)
187 return NULL;
188
189 mutex_init(&HFS_I(inode)->extents_lock);
190 INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
191 spin_lock_init(&HFS_I(inode)->open_dir_lock);
192 hfs_cat_build_key(sb, (btree_key *)&HFS_I(inode)->cat_key, dir->i_ino, name);
193 inode->i_ino = HFS_SB(sb)->next_id++;
194 inode->i_mode = mode;
195 inode->i_uid = current_fsuid();
196 inode->i_gid = current_fsgid();
197 set_nlink(inode, 1);
198 inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
199 HFS_I(inode)->flags = 0;
200 HFS_I(inode)->rsrc_inode = NULL;
201 HFS_I(inode)->fs_blocks = 0;
202 if (S_ISDIR(mode)) {
203 inode->i_size = 2;
204 HFS_SB(sb)->folder_count++;
205 if (dir->i_ino == HFS_ROOT_CNID)
206 HFS_SB(sb)->root_dirs++;
207 inode->i_op = &hfs_dir_inode_operations;
208 inode->i_fop = &hfs_dir_operations;
209 inode->i_mode |= S_IRWXUGO;
210 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_dir_umask;
211 } else if (S_ISREG(mode)) {
212 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
213 HFS_SB(sb)->file_count++;
214 if (dir->i_ino == HFS_ROOT_CNID)
215 HFS_SB(sb)->root_files++;
216 inode->i_op = &hfs_file_inode_operations;
217 inode->i_fop = &hfs_file_operations;
218 inode->i_mapping->a_ops = &hfs_aops;
219 inode->i_mode |= S_IRUGO|S_IXUGO;
220 if (mode & S_IWUSR)
221 inode->i_mode |= S_IWUGO;
222 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_file_umask;
223 HFS_I(inode)->phys_size = 0;
224 HFS_I(inode)->alloc_blocks = 0;
225 HFS_I(inode)->first_blocks = 0;
226 HFS_I(inode)->cached_start = 0;
227 HFS_I(inode)->cached_blocks = 0;
228 memset(HFS_I(inode)->first_extents, 0, sizeof(hfs_extent_rec));
229 memset(HFS_I(inode)->cached_extents, 0, sizeof(hfs_extent_rec));
230 }
231 insert_inode_hash(inode);
232 mark_inode_dirty(inode);
233 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
234 hfs_mark_mdb_dirty(sb);
235
236 return inode;
237}
238
239void hfs_delete_inode(struct inode *inode)
240{
241 struct super_block *sb = inode->i_sb;
242
243 hfs_dbg(INODE, "delete_inode: %lu\n", inode->i_ino);
244 if (S_ISDIR(inode->i_mode)) {
245 HFS_SB(sb)->folder_count--;
246 if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
247 HFS_SB(sb)->root_dirs--;
248 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
249 hfs_mark_mdb_dirty(sb);
250 return;
251 }
252 HFS_SB(sb)->file_count--;
253 if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
254 HFS_SB(sb)->root_files--;
255 if (S_ISREG(inode->i_mode)) {
256 if (!inode->i_nlink) {
257 inode->i_size = 0;
258 hfs_file_truncate(inode);
259 }
260 }
261 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
262 hfs_mark_mdb_dirty(sb);
263}
264
265void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext,
266 __be32 __log_size, __be32 phys_size, u32 clump_size)
267{
268 struct super_block *sb = inode->i_sb;
269 u32 log_size = be32_to_cpu(__log_size);
270 u16 count;
271 int i;
272
273 memcpy(HFS_I(inode)->first_extents, ext, sizeof(hfs_extent_rec));
274 for (count = 0, i = 0; i < 3; i++)
275 count += be16_to_cpu(ext[i].count);
276 HFS_I(inode)->first_blocks = count;
277
278 inode->i_size = HFS_I(inode)->phys_size = log_size;
279 HFS_I(inode)->fs_blocks = (log_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
280 inode_set_bytes(inode, HFS_I(inode)->fs_blocks << sb->s_blocksize_bits);
281 HFS_I(inode)->alloc_blocks = be32_to_cpu(phys_size) /
282 HFS_SB(sb)->alloc_blksz;
283 HFS_I(inode)->clump_blocks = clump_size / HFS_SB(sb)->alloc_blksz;
284 if (!HFS_I(inode)->clump_blocks)
285 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
286}
287
288struct hfs_iget_data {
289 struct hfs_cat_key *key;
290 hfs_cat_rec *rec;
291};
292
293static int hfs_test_inode(struct inode *inode, void *data)
294{
295 struct hfs_iget_data *idata = data;
296 hfs_cat_rec *rec;
297
298 rec = idata->rec;
299 switch (rec->type) {
300 case HFS_CDR_DIR:
301 return inode->i_ino == be32_to_cpu(rec->dir.DirID);
302 case HFS_CDR_FIL:
303 return inode->i_ino == be32_to_cpu(rec->file.FlNum);
304 default:
305 BUG();
306 return 1;
307 }
308}
309
310/*
311 * hfs_read_inode
312 */
313static int hfs_read_inode(struct inode *inode, void *data)
314{
315 struct hfs_iget_data *idata = data;
316 struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
317 hfs_cat_rec *rec;
318
319 HFS_I(inode)->flags = 0;
320 HFS_I(inode)->rsrc_inode = NULL;
321 mutex_init(&HFS_I(inode)->extents_lock);
322 INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
323 spin_lock_init(&HFS_I(inode)->open_dir_lock);
324
325 /* Initialize the inode */
326 inode->i_uid = hsb->s_uid;
327 inode->i_gid = hsb->s_gid;
328 set_nlink(inode, 1);
329
330 if (idata->key)
331 HFS_I(inode)->cat_key = *idata->key;
332 else
333 HFS_I(inode)->flags |= HFS_FLG_RSRC;
334 HFS_I(inode)->tz_secondswest = sys_tz.tz_minuteswest * 60;
335
336 rec = idata->rec;
337 switch (rec->type) {
338 case HFS_CDR_FIL:
339 if (!HFS_IS_RSRC(inode)) {
340 hfs_inode_read_fork(inode, rec->file.ExtRec, rec->file.LgLen,
341 rec->file.PyLen, be16_to_cpu(rec->file.ClpSize));
342 } else {
343 hfs_inode_read_fork(inode, rec->file.RExtRec, rec->file.RLgLen,
344 rec->file.RPyLen, be16_to_cpu(rec->file.ClpSize));
345 }
346
347 inode->i_ino = be32_to_cpu(rec->file.FlNum);
348 inode->i_mode = S_IRUGO | S_IXUGO;
349 if (!(rec->file.Flags & HFS_FIL_LOCK))
350 inode->i_mode |= S_IWUGO;
351 inode->i_mode &= ~hsb->s_file_umask;
352 inode->i_mode |= S_IFREG;
353 inode->i_ctime = inode->i_atime = inode->i_mtime =
354 hfs_m_to_utime(rec->file.MdDat);
355 inode->i_op = &hfs_file_inode_operations;
356 inode->i_fop = &hfs_file_operations;
357 inode->i_mapping->a_ops = &hfs_aops;
358 break;
359 case HFS_CDR_DIR:
360 inode->i_ino = be32_to_cpu(rec->dir.DirID);
361 inode->i_size = be16_to_cpu(rec->dir.Val) + 2;
362 HFS_I(inode)->fs_blocks = 0;
363 inode->i_mode = S_IFDIR | (S_IRWXUGO & ~hsb->s_dir_umask);
364 inode->i_ctime = inode->i_atime = inode->i_mtime =
365 hfs_m_to_utime(rec->dir.MdDat);
366 inode->i_op = &hfs_dir_inode_operations;
367 inode->i_fop = &hfs_dir_operations;
368 break;
369 default:
370 make_bad_inode(inode);
371 }
372 return 0;
373}
374
375/*
376 * __hfs_iget()
377 *
378 * Given the MDB for a HFS filesystem, a 'key' and an 'entry' in
379 * the catalog B-tree and the 'type' of the desired file return the
380 * inode for that file/directory or NULL. Note that 'type' indicates
381 * whether we want the actual file or directory, or the corresponding
382 * metadata (AppleDouble header file or CAP metadata file).
383 */
384struct inode *hfs_iget(struct super_block *sb, struct hfs_cat_key *key, hfs_cat_rec *rec)
385{
386 struct hfs_iget_data data = { key, rec };
387 struct inode *inode;
388 u32 cnid;
389
390 switch (rec->type) {
391 case HFS_CDR_DIR:
392 cnid = be32_to_cpu(rec->dir.DirID);
393 break;
394 case HFS_CDR_FIL:
395 cnid = be32_to_cpu(rec->file.FlNum);
396 break;
397 default:
398 return NULL;
399 }
400 inode = iget5_locked(sb, cnid, hfs_test_inode, hfs_read_inode, &data);
401 if (inode && (inode->i_state & I_NEW))
402 unlock_new_inode(inode);
403 return inode;
404}
405
406void hfs_inode_write_fork(struct inode *inode, struct hfs_extent *ext,
407 __be32 *log_size, __be32 *phys_size)
408{
409 memcpy(ext, HFS_I(inode)->first_extents, sizeof(hfs_extent_rec));
410
411 if (log_size)
412 *log_size = cpu_to_be32(inode->i_size);
413 if (phys_size)
414 *phys_size = cpu_to_be32(HFS_I(inode)->alloc_blocks *
415 HFS_SB(inode->i_sb)->alloc_blksz);
416}
417
418int hfs_write_inode(struct inode *inode, struct writeback_control *wbc)
419{
420 struct inode *main_inode = inode;
421 struct hfs_find_data fd;
422 hfs_cat_rec rec;
423 int res;
424
425 hfs_dbg(INODE, "hfs_write_inode: %lu\n", inode->i_ino);
426 res = hfs_ext_write_extent(inode);
427 if (res)
428 return res;
429
430 if (inode->i_ino < HFS_FIRSTUSER_CNID) {
431 switch (inode->i_ino) {
432 case HFS_ROOT_CNID:
433 break;
434 case HFS_EXT_CNID:
435 hfs_btree_write(HFS_SB(inode->i_sb)->ext_tree);
436 return 0;
437 case HFS_CAT_CNID:
438 hfs_btree_write(HFS_SB(inode->i_sb)->cat_tree);
439 return 0;
440 default:
441 BUG();
442 return -EIO;
443 }
444 }
445
446 if (HFS_IS_RSRC(inode))
447 main_inode = HFS_I(inode)->rsrc_inode;
448
449 if (!main_inode->i_nlink)
450 return 0;
451
452 if (hfs_find_init(HFS_SB(main_inode->i_sb)->cat_tree, &fd))
453 /* panic? */
454 return -EIO;
455
456 fd.search_key->cat = HFS_I(main_inode)->cat_key;
457 if (hfs_brec_find(&fd))
458 /* panic? */
459 goto out;
460
461 if (S_ISDIR(main_inode->i_mode)) {
462 if (fd.entrylength < sizeof(struct hfs_cat_dir))
463 /* panic? */;
464 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
465 sizeof(struct hfs_cat_dir));
466 if (rec.type != HFS_CDR_DIR ||
467 be32_to_cpu(rec.dir.DirID) != inode->i_ino) {
468 }
469
470 rec.dir.MdDat = hfs_u_to_mtime(inode->i_mtime);
471 rec.dir.Val = cpu_to_be16(inode->i_size - 2);
472
473 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
474 sizeof(struct hfs_cat_dir));
475 } else if (HFS_IS_RSRC(inode)) {
476 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
477 sizeof(struct hfs_cat_file));
478 hfs_inode_write_fork(inode, rec.file.RExtRec,
479 &rec.file.RLgLen, &rec.file.RPyLen);
480 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
481 sizeof(struct hfs_cat_file));
482 } else {
483 if (fd.entrylength < sizeof(struct hfs_cat_file))
484 /* panic? */;
485 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
486 sizeof(struct hfs_cat_file));
487 if (rec.type != HFS_CDR_FIL ||
488 be32_to_cpu(rec.file.FlNum) != inode->i_ino) {
489 }
490
491 if (inode->i_mode & S_IWUSR)
492 rec.file.Flags &= ~HFS_FIL_LOCK;
493 else
494 rec.file.Flags |= HFS_FIL_LOCK;
495 hfs_inode_write_fork(inode, rec.file.ExtRec, &rec.file.LgLen, &rec.file.PyLen);
496 rec.file.MdDat = hfs_u_to_mtime(inode->i_mtime);
497
498 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
499 sizeof(struct hfs_cat_file));
500 }
501out:
502 hfs_find_exit(&fd);
503 return 0;
504}
505
506static struct dentry *hfs_file_lookup(struct inode *dir, struct dentry *dentry,
507 unsigned int flags)
508{
509 struct inode *inode = NULL;
510 hfs_cat_rec rec;
511 struct hfs_find_data fd;
512 int res;
513
514 if (HFS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc"))
515 goto out;
516
517 inode = HFS_I(dir)->rsrc_inode;
518 if (inode)
519 goto out;
520
521 inode = new_inode(dir->i_sb);
522 if (!inode)
523 return ERR_PTR(-ENOMEM);
524
525 res = hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd);
526 if (res) {
527 iput(inode);
528 return ERR_PTR(res);
529 }
530 fd.search_key->cat = HFS_I(dir)->cat_key;
531 res = hfs_brec_read(&fd, &rec, sizeof(rec));
532 if (!res) {
533 struct hfs_iget_data idata = { NULL, &rec };
534 hfs_read_inode(inode, &idata);
535 }
536 hfs_find_exit(&fd);
537 if (res) {
538 iput(inode);
539 return ERR_PTR(res);
540 }
541 HFS_I(inode)->rsrc_inode = dir;
542 HFS_I(dir)->rsrc_inode = inode;
543 igrab(dir);
544 hlist_add_fake(&inode->i_hash);
545 mark_inode_dirty(inode);
546out:
547 d_add(dentry, inode);
548 return NULL;
549}
550
551void hfs_evict_inode(struct inode *inode)
552{
553 truncate_inode_pages_final(&inode->i_data);
554 clear_inode(inode);
555 if (HFS_IS_RSRC(inode) && HFS_I(inode)->rsrc_inode) {
556 HFS_I(HFS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
557 iput(HFS_I(inode)->rsrc_inode);
558 }
559}
560
561static int hfs_file_open(struct inode *inode, struct file *file)
562{
563 if (HFS_IS_RSRC(inode))
564 inode = HFS_I(inode)->rsrc_inode;
565 atomic_inc(&HFS_I(inode)->opencnt);
566 return 0;
567}
568
569static int hfs_file_release(struct inode *inode, struct file *file)
570{
571 //struct super_block *sb = inode->i_sb;
572
573 if (HFS_IS_RSRC(inode))
574 inode = HFS_I(inode)->rsrc_inode;
575 if (atomic_dec_and_test(&HFS_I(inode)->opencnt)) {
576 inode_lock(inode);
577 hfs_file_truncate(inode);
578 //if (inode->i_flags & S_DEAD) {
579 // hfs_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
580 // hfs_delete_inode(inode);
581 //}
582 inode_unlock(inode);
583 }
584 return 0;
585}
586
587/*
588 * hfs_notify_change()
589 *
590 * Based very closely on fs/msdos/inode.c by Werner Almesberger
591 *
592 * This is the notify_change() field in the super_operations structure
593 * for HFS file systems. The purpose is to take that changes made to
594 * an inode and apply then in a filesystem-dependent manner. In this
595 * case the process has a few of tasks to do:
596 * 1) prevent changes to the i_uid and i_gid fields.
597 * 2) map file permissions to the closest allowable permissions
598 * 3) Since multiple Linux files can share the same on-disk inode under
599 * HFS (for instance the data and resource forks of a file) a change
600 * to permissions must be applied to all other in-core inodes which
601 * correspond to the same HFS file.
602 */
603
604int hfs_inode_setattr(struct dentry *dentry, struct iattr * attr)
605{
606 struct inode *inode = d_inode(dentry);
607 struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
608 int error;
609
610 error = setattr_prepare(dentry, attr); /* basic permission checks */
611 if (error)
612 return error;
613
614 /* no uig/gid changes and limit which mode bits can be set */
615 if (((attr->ia_valid & ATTR_UID) &&
616 (!uid_eq(attr->ia_uid, hsb->s_uid))) ||
617 ((attr->ia_valid & ATTR_GID) &&
618 (!gid_eq(attr->ia_gid, hsb->s_gid))) ||
619 ((attr->ia_valid & ATTR_MODE) &&
620 ((S_ISDIR(inode->i_mode) &&
621 (attr->ia_mode != inode->i_mode)) ||
622 (attr->ia_mode & ~HFS_VALID_MODE_BITS)))) {
623 return hsb->s_quiet ? 0 : error;
624 }
625
626 if (attr->ia_valid & ATTR_MODE) {
627 /* Only the 'w' bits can ever change and only all together. */
628 if (attr->ia_mode & S_IWUSR)
629 attr->ia_mode = inode->i_mode | S_IWUGO;
630 else
631 attr->ia_mode = inode->i_mode & ~S_IWUGO;
632 attr->ia_mode &= S_ISDIR(inode->i_mode) ? ~hsb->s_dir_umask: ~hsb->s_file_umask;
633 }
634
635 if ((attr->ia_valid & ATTR_SIZE) &&
636 attr->ia_size != i_size_read(inode)) {
637 inode_dio_wait(inode);
638
639 error = inode_newsize_ok(inode, attr->ia_size);
640 if (error)
641 return error;
642
643 truncate_setsize(inode, attr->ia_size);
644 hfs_file_truncate(inode);
645 }
646
647 setattr_copy(inode, attr);
648 mark_inode_dirty(inode);
649 return 0;
650}
651
652static int hfs_file_fsync(struct file *filp, loff_t start, loff_t end,
653 int datasync)
654{
655 struct inode *inode = filp->f_mapping->host;
656 struct super_block * sb;
657 int ret, err;
658
659 ret = file_write_and_wait_range(filp, start, end);
660 if (ret)
661 return ret;
662 inode_lock(inode);
663
664 /* sync the inode to buffers */
665 ret = write_inode_now(inode, 0);
666
667 /* sync the superblock to buffers */
668 sb = inode->i_sb;
669 flush_delayed_work(&HFS_SB(sb)->mdb_work);
670 /* .. finally sync the buffers to disk */
671 err = sync_blockdev(sb->s_bdev);
672 if (!ret)
673 ret = err;
674 inode_unlock(inode);
675 return ret;
676}
677
678static const struct file_operations hfs_file_operations = {
679 .llseek = generic_file_llseek,
680 .read_iter = generic_file_read_iter,
681 .write_iter = generic_file_write_iter,
682 .mmap = generic_file_mmap,
683 .splice_read = generic_file_splice_read,
684 .fsync = hfs_file_fsync,
685 .open = hfs_file_open,
686 .release = hfs_file_release,
687};
688
689static const struct inode_operations hfs_file_inode_operations = {
690 .lookup = hfs_file_lookup,
691 .setattr = hfs_inode_setattr,
692 .listxattr = generic_listxattr,
693};
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_read_folio(struct file *file, struct folio *folio)
38{
39 return block_read_full_folio(folio, 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
52int hfs_write_begin(struct file *file, struct address_space *mapping,
53 loff_t pos, unsigned len, struct page **pagep, void **fsdata)
54{
55 int ret;
56
57 *pagep = NULL;
58 ret = cont_write_begin(file, mapping, pos, len, pagep, fsdata,
59 hfs_get_block,
60 &HFS_I(mapping->host)->phys_size);
61 if (unlikely(ret))
62 hfs_write_failed(mapping, pos + len);
63
64 return ret;
65}
66
67static sector_t hfs_bmap(struct address_space *mapping, sector_t block)
68{
69 return generic_block_bmap(mapping, block, hfs_get_block);
70}
71
72static bool hfs_release_folio(struct folio *folio, gfp_t mask)
73{
74 struct inode *inode = folio->mapping->host;
75 struct super_block *sb = inode->i_sb;
76 struct hfs_btree *tree;
77 struct hfs_bnode *node;
78 u32 nidx;
79 int i;
80 bool res = true;
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 false;
92 }
93
94 if (!tree)
95 return false;
96
97 if (tree->node_size >= PAGE_SIZE) {
98 nidx = folio->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 = false;
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 = folio->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 = false;
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(folio) : false;
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 .dirty_folio = block_dirty_folio,
163 .invalidate_folio = block_invalidate_folio,
164 .read_folio = hfs_read_folio,
165 .writepage = hfs_writepage,
166 .write_begin = hfs_write_begin,
167 .write_end = generic_write_end,
168 .bmap = hfs_bmap,
169 .release_folio = hfs_release_folio,
170};
171
172const struct address_space_operations hfs_aops = {
173 .dirty_folio = block_dirty_folio,
174 .invalidate_folio = block_invalidate_folio,
175 .read_folio = hfs_read_folio,
176 .write_begin = hfs_write_begin,
177 .write_end = generic_write_end,
178 .bmap = hfs_bmap,
179 .direct_IO = hfs_direct_IO,
180 .writepages = hfs_writepages,
181 .migrate_folio = buffer_migrate_folio,
182};
183
184/*
185 * hfs_new_inode
186 */
187struct inode *hfs_new_inode(struct inode *dir, const struct qstr *name, umode_t mode)
188{
189 struct super_block *sb = dir->i_sb;
190 struct inode *inode = new_inode(sb);
191 if (!inode)
192 return NULL;
193
194 mutex_init(&HFS_I(inode)->extents_lock);
195 INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
196 spin_lock_init(&HFS_I(inode)->open_dir_lock);
197 hfs_cat_build_key(sb, (btree_key *)&HFS_I(inode)->cat_key, dir->i_ino, name);
198 inode->i_ino = HFS_SB(sb)->next_id++;
199 inode->i_mode = mode;
200 inode->i_uid = current_fsuid();
201 inode->i_gid = current_fsgid();
202 set_nlink(inode, 1);
203 inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
204 HFS_I(inode)->flags = 0;
205 HFS_I(inode)->rsrc_inode = NULL;
206 HFS_I(inode)->fs_blocks = 0;
207 if (S_ISDIR(mode)) {
208 inode->i_size = 2;
209 HFS_SB(sb)->folder_count++;
210 if (dir->i_ino == HFS_ROOT_CNID)
211 HFS_SB(sb)->root_dirs++;
212 inode->i_op = &hfs_dir_inode_operations;
213 inode->i_fop = &hfs_dir_operations;
214 inode->i_mode |= S_IRWXUGO;
215 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_dir_umask;
216 } else if (S_ISREG(mode)) {
217 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
218 HFS_SB(sb)->file_count++;
219 if (dir->i_ino == HFS_ROOT_CNID)
220 HFS_SB(sb)->root_files++;
221 inode->i_op = &hfs_file_inode_operations;
222 inode->i_fop = &hfs_file_operations;
223 inode->i_mapping->a_ops = &hfs_aops;
224 inode->i_mode |= S_IRUGO|S_IXUGO;
225 if (mode & S_IWUSR)
226 inode->i_mode |= S_IWUGO;
227 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_file_umask;
228 HFS_I(inode)->phys_size = 0;
229 HFS_I(inode)->alloc_blocks = 0;
230 HFS_I(inode)->first_blocks = 0;
231 HFS_I(inode)->cached_start = 0;
232 HFS_I(inode)->cached_blocks = 0;
233 memset(HFS_I(inode)->first_extents, 0, sizeof(hfs_extent_rec));
234 memset(HFS_I(inode)->cached_extents, 0, sizeof(hfs_extent_rec));
235 }
236 insert_inode_hash(inode);
237 mark_inode_dirty(inode);
238 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
239 hfs_mark_mdb_dirty(sb);
240
241 return inode;
242}
243
244void hfs_delete_inode(struct inode *inode)
245{
246 struct super_block *sb = inode->i_sb;
247
248 hfs_dbg(INODE, "delete_inode: %lu\n", inode->i_ino);
249 if (S_ISDIR(inode->i_mode)) {
250 HFS_SB(sb)->folder_count--;
251 if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
252 HFS_SB(sb)->root_dirs--;
253 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
254 hfs_mark_mdb_dirty(sb);
255 return;
256 }
257 HFS_SB(sb)->file_count--;
258 if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
259 HFS_SB(sb)->root_files--;
260 if (S_ISREG(inode->i_mode)) {
261 if (!inode->i_nlink) {
262 inode->i_size = 0;
263 hfs_file_truncate(inode);
264 }
265 }
266 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
267 hfs_mark_mdb_dirty(sb);
268}
269
270void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext,
271 __be32 __log_size, __be32 phys_size, u32 clump_size)
272{
273 struct super_block *sb = inode->i_sb;
274 u32 log_size = be32_to_cpu(__log_size);
275 u16 count;
276 int i;
277
278 memcpy(HFS_I(inode)->first_extents, ext, sizeof(hfs_extent_rec));
279 for (count = 0, i = 0; i < 3; i++)
280 count += be16_to_cpu(ext[i].count);
281 HFS_I(inode)->first_blocks = count;
282
283 inode->i_size = HFS_I(inode)->phys_size = log_size;
284 HFS_I(inode)->fs_blocks = (log_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
285 inode_set_bytes(inode, HFS_I(inode)->fs_blocks << sb->s_blocksize_bits);
286 HFS_I(inode)->alloc_blocks = be32_to_cpu(phys_size) /
287 HFS_SB(sb)->alloc_blksz;
288 HFS_I(inode)->clump_blocks = clump_size / HFS_SB(sb)->alloc_blksz;
289 if (!HFS_I(inode)->clump_blocks)
290 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
291}
292
293struct hfs_iget_data {
294 struct hfs_cat_key *key;
295 hfs_cat_rec *rec;
296};
297
298static int hfs_test_inode(struct inode *inode, void *data)
299{
300 struct hfs_iget_data *idata = data;
301 hfs_cat_rec *rec;
302
303 rec = idata->rec;
304 switch (rec->type) {
305 case HFS_CDR_DIR:
306 return inode->i_ino == be32_to_cpu(rec->dir.DirID);
307 case HFS_CDR_FIL:
308 return inode->i_ino == be32_to_cpu(rec->file.FlNum);
309 default:
310 BUG();
311 return 1;
312 }
313}
314
315/*
316 * hfs_read_inode
317 */
318static int hfs_read_inode(struct inode *inode, void *data)
319{
320 struct hfs_iget_data *idata = data;
321 struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
322 hfs_cat_rec *rec;
323
324 HFS_I(inode)->flags = 0;
325 HFS_I(inode)->rsrc_inode = NULL;
326 mutex_init(&HFS_I(inode)->extents_lock);
327 INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
328 spin_lock_init(&HFS_I(inode)->open_dir_lock);
329
330 /* Initialize the inode */
331 inode->i_uid = hsb->s_uid;
332 inode->i_gid = hsb->s_gid;
333 set_nlink(inode, 1);
334
335 if (idata->key)
336 HFS_I(inode)->cat_key = *idata->key;
337 else
338 HFS_I(inode)->flags |= HFS_FLG_RSRC;
339 HFS_I(inode)->tz_secondswest = sys_tz.tz_minuteswest * 60;
340
341 rec = idata->rec;
342 switch (rec->type) {
343 case HFS_CDR_FIL:
344 if (!HFS_IS_RSRC(inode)) {
345 hfs_inode_read_fork(inode, rec->file.ExtRec, rec->file.LgLen,
346 rec->file.PyLen, be16_to_cpu(rec->file.ClpSize));
347 } else {
348 hfs_inode_read_fork(inode, rec->file.RExtRec, rec->file.RLgLen,
349 rec->file.RPyLen, be16_to_cpu(rec->file.ClpSize));
350 }
351
352 inode->i_ino = be32_to_cpu(rec->file.FlNum);
353 inode->i_mode = S_IRUGO | S_IXUGO;
354 if (!(rec->file.Flags & HFS_FIL_LOCK))
355 inode->i_mode |= S_IWUGO;
356 inode->i_mode &= ~hsb->s_file_umask;
357 inode->i_mode |= S_IFREG;
358 inode->i_ctime = inode->i_atime = inode->i_mtime =
359 hfs_m_to_utime(rec->file.MdDat);
360 inode->i_op = &hfs_file_inode_operations;
361 inode->i_fop = &hfs_file_operations;
362 inode->i_mapping->a_ops = &hfs_aops;
363 break;
364 case HFS_CDR_DIR:
365 inode->i_ino = be32_to_cpu(rec->dir.DirID);
366 inode->i_size = be16_to_cpu(rec->dir.Val) + 2;
367 HFS_I(inode)->fs_blocks = 0;
368 inode->i_mode = S_IFDIR | (S_IRWXUGO & ~hsb->s_dir_umask);
369 inode->i_ctime = inode->i_atime = inode->i_mtime =
370 hfs_m_to_utime(rec->dir.MdDat);
371 inode->i_op = &hfs_dir_inode_operations;
372 inode->i_fop = &hfs_dir_operations;
373 break;
374 default:
375 make_bad_inode(inode);
376 }
377 return 0;
378}
379
380/*
381 * __hfs_iget()
382 *
383 * Given the MDB for a HFS filesystem, a 'key' and an 'entry' in
384 * the catalog B-tree and the 'type' of the desired file return the
385 * inode for that file/directory or NULL. Note that 'type' indicates
386 * whether we want the actual file or directory, or the corresponding
387 * metadata (AppleDouble header file or CAP metadata file).
388 */
389struct inode *hfs_iget(struct super_block *sb, struct hfs_cat_key *key, hfs_cat_rec *rec)
390{
391 struct hfs_iget_data data = { key, rec };
392 struct inode *inode;
393 u32 cnid;
394
395 switch (rec->type) {
396 case HFS_CDR_DIR:
397 cnid = be32_to_cpu(rec->dir.DirID);
398 break;
399 case HFS_CDR_FIL:
400 cnid = be32_to_cpu(rec->file.FlNum);
401 break;
402 default:
403 return NULL;
404 }
405 inode = iget5_locked(sb, cnid, hfs_test_inode, hfs_read_inode, &data);
406 if (inode && (inode->i_state & I_NEW))
407 unlock_new_inode(inode);
408 return inode;
409}
410
411void hfs_inode_write_fork(struct inode *inode, struct hfs_extent *ext,
412 __be32 *log_size, __be32 *phys_size)
413{
414 memcpy(ext, HFS_I(inode)->first_extents, sizeof(hfs_extent_rec));
415
416 if (log_size)
417 *log_size = cpu_to_be32(inode->i_size);
418 if (phys_size)
419 *phys_size = cpu_to_be32(HFS_I(inode)->alloc_blocks *
420 HFS_SB(inode->i_sb)->alloc_blksz);
421}
422
423int hfs_write_inode(struct inode *inode, struct writeback_control *wbc)
424{
425 struct inode *main_inode = inode;
426 struct hfs_find_data fd;
427 hfs_cat_rec rec;
428 int res;
429
430 hfs_dbg(INODE, "hfs_write_inode: %lu\n", inode->i_ino);
431 res = hfs_ext_write_extent(inode);
432 if (res)
433 return res;
434
435 if (inode->i_ino < HFS_FIRSTUSER_CNID) {
436 switch (inode->i_ino) {
437 case HFS_ROOT_CNID:
438 break;
439 case HFS_EXT_CNID:
440 hfs_btree_write(HFS_SB(inode->i_sb)->ext_tree);
441 return 0;
442 case HFS_CAT_CNID:
443 hfs_btree_write(HFS_SB(inode->i_sb)->cat_tree);
444 return 0;
445 default:
446 BUG();
447 return -EIO;
448 }
449 }
450
451 if (HFS_IS_RSRC(inode))
452 main_inode = HFS_I(inode)->rsrc_inode;
453
454 if (!main_inode->i_nlink)
455 return 0;
456
457 if (hfs_find_init(HFS_SB(main_inode->i_sb)->cat_tree, &fd))
458 /* panic? */
459 return -EIO;
460
461 res = -EIO;
462 if (HFS_I(main_inode)->cat_key.CName.len > HFS_NAMELEN)
463 goto out;
464 fd.search_key->cat = HFS_I(main_inode)->cat_key;
465 if (hfs_brec_find(&fd))
466 goto out;
467
468 if (S_ISDIR(main_inode->i_mode)) {
469 if (fd.entrylength < sizeof(struct hfs_cat_dir))
470 goto out;
471 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
472 sizeof(struct hfs_cat_dir));
473 if (rec.type != HFS_CDR_DIR ||
474 be32_to_cpu(rec.dir.DirID) != inode->i_ino) {
475 }
476
477 rec.dir.MdDat = hfs_u_to_mtime(inode->i_mtime);
478 rec.dir.Val = cpu_to_be16(inode->i_size - 2);
479
480 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
481 sizeof(struct hfs_cat_dir));
482 } else if (HFS_IS_RSRC(inode)) {
483 if (fd.entrylength < sizeof(struct hfs_cat_file))
484 goto out;
485 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
486 sizeof(struct hfs_cat_file));
487 hfs_inode_write_fork(inode, rec.file.RExtRec,
488 &rec.file.RLgLen, &rec.file.RPyLen);
489 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
490 sizeof(struct hfs_cat_file));
491 } else {
492 if (fd.entrylength < sizeof(struct hfs_cat_file))
493 goto out;
494 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
495 sizeof(struct hfs_cat_file));
496 if (rec.type != HFS_CDR_FIL ||
497 be32_to_cpu(rec.file.FlNum) != inode->i_ino) {
498 }
499
500 if (inode->i_mode & S_IWUSR)
501 rec.file.Flags &= ~HFS_FIL_LOCK;
502 else
503 rec.file.Flags |= HFS_FIL_LOCK;
504 hfs_inode_write_fork(inode, rec.file.ExtRec, &rec.file.LgLen, &rec.file.PyLen);
505 rec.file.MdDat = hfs_u_to_mtime(inode->i_mtime);
506
507 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
508 sizeof(struct hfs_cat_file));
509 }
510 res = 0;
511out:
512 hfs_find_exit(&fd);
513 return res;
514}
515
516static struct dentry *hfs_file_lookup(struct inode *dir, struct dentry *dentry,
517 unsigned int flags)
518{
519 struct inode *inode = NULL;
520 hfs_cat_rec rec;
521 struct hfs_find_data fd;
522 int res;
523
524 if (HFS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc"))
525 goto out;
526
527 inode = HFS_I(dir)->rsrc_inode;
528 if (inode)
529 goto out;
530
531 inode = new_inode(dir->i_sb);
532 if (!inode)
533 return ERR_PTR(-ENOMEM);
534
535 res = hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd);
536 if (res) {
537 iput(inode);
538 return ERR_PTR(res);
539 }
540 fd.search_key->cat = HFS_I(dir)->cat_key;
541 res = hfs_brec_read(&fd, &rec, sizeof(rec));
542 if (!res) {
543 struct hfs_iget_data idata = { NULL, &rec };
544 hfs_read_inode(inode, &idata);
545 }
546 hfs_find_exit(&fd);
547 if (res) {
548 iput(inode);
549 return ERR_PTR(res);
550 }
551 HFS_I(inode)->rsrc_inode = dir;
552 HFS_I(dir)->rsrc_inode = inode;
553 igrab(dir);
554 inode_fake_hash(inode);
555 mark_inode_dirty(inode);
556 dont_mount(dentry);
557out:
558 return d_splice_alias(inode, dentry);
559}
560
561void hfs_evict_inode(struct inode *inode)
562{
563 truncate_inode_pages_final(&inode->i_data);
564 clear_inode(inode);
565 if (HFS_IS_RSRC(inode) && HFS_I(inode)->rsrc_inode) {
566 HFS_I(HFS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
567 iput(HFS_I(inode)->rsrc_inode);
568 }
569}
570
571static int hfs_file_open(struct inode *inode, struct file *file)
572{
573 if (HFS_IS_RSRC(inode))
574 inode = HFS_I(inode)->rsrc_inode;
575 atomic_inc(&HFS_I(inode)->opencnt);
576 return 0;
577}
578
579static int hfs_file_release(struct inode *inode, struct file *file)
580{
581 //struct super_block *sb = inode->i_sb;
582
583 if (HFS_IS_RSRC(inode))
584 inode = HFS_I(inode)->rsrc_inode;
585 if (atomic_dec_and_test(&HFS_I(inode)->opencnt)) {
586 inode_lock(inode);
587 hfs_file_truncate(inode);
588 //if (inode->i_flags & S_DEAD) {
589 // hfs_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
590 // hfs_delete_inode(inode);
591 //}
592 inode_unlock(inode);
593 }
594 return 0;
595}
596
597/*
598 * hfs_notify_change()
599 *
600 * Based very closely on fs/msdos/inode.c by Werner Almesberger
601 *
602 * This is the notify_change() field in the super_operations structure
603 * for HFS file systems. The purpose is to take that changes made to
604 * an inode and apply then in a filesystem-dependent manner. In this
605 * case the process has a few of tasks to do:
606 * 1) prevent changes to the i_uid and i_gid fields.
607 * 2) map file permissions to the closest allowable permissions
608 * 3) Since multiple Linux files can share the same on-disk inode under
609 * HFS (for instance the data and resource forks of a file) a change
610 * to permissions must be applied to all other in-core inodes which
611 * correspond to the same HFS file.
612 */
613
614int hfs_inode_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
615 struct iattr *attr)
616{
617 struct inode *inode = d_inode(dentry);
618 struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
619 int error;
620
621 error = setattr_prepare(&init_user_ns, dentry,
622 attr); /* basic permission checks */
623 if (error)
624 return error;
625
626 /* no uig/gid changes and limit which mode bits can be set */
627 if (((attr->ia_valid & ATTR_UID) &&
628 (!uid_eq(attr->ia_uid, hsb->s_uid))) ||
629 ((attr->ia_valid & ATTR_GID) &&
630 (!gid_eq(attr->ia_gid, hsb->s_gid))) ||
631 ((attr->ia_valid & ATTR_MODE) &&
632 ((S_ISDIR(inode->i_mode) &&
633 (attr->ia_mode != inode->i_mode)) ||
634 (attr->ia_mode & ~HFS_VALID_MODE_BITS)))) {
635 return hsb->s_quiet ? 0 : error;
636 }
637
638 if (attr->ia_valid & ATTR_MODE) {
639 /* Only the 'w' bits can ever change and only all together. */
640 if (attr->ia_mode & S_IWUSR)
641 attr->ia_mode = inode->i_mode | S_IWUGO;
642 else
643 attr->ia_mode = inode->i_mode & ~S_IWUGO;
644 attr->ia_mode &= S_ISDIR(inode->i_mode) ? ~hsb->s_dir_umask: ~hsb->s_file_umask;
645 }
646
647 if ((attr->ia_valid & ATTR_SIZE) &&
648 attr->ia_size != i_size_read(inode)) {
649 inode_dio_wait(inode);
650
651 error = inode_newsize_ok(inode, attr->ia_size);
652 if (error)
653 return error;
654
655 truncate_setsize(inode, attr->ia_size);
656 hfs_file_truncate(inode);
657 inode->i_atime = inode->i_mtime = inode->i_ctime =
658 current_time(inode);
659 }
660
661 setattr_copy(&init_user_ns, inode, attr);
662 mark_inode_dirty(inode);
663 return 0;
664}
665
666static int hfs_file_fsync(struct file *filp, loff_t start, loff_t end,
667 int datasync)
668{
669 struct inode *inode = filp->f_mapping->host;
670 struct super_block * sb;
671 int ret, err;
672
673 ret = file_write_and_wait_range(filp, start, end);
674 if (ret)
675 return ret;
676 inode_lock(inode);
677
678 /* sync the inode to buffers */
679 ret = write_inode_now(inode, 0);
680
681 /* sync the superblock to buffers */
682 sb = inode->i_sb;
683 flush_delayed_work(&HFS_SB(sb)->mdb_work);
684 /* .. finally sync the buffers to disk */
685 err = sync_blockdev(sb->s_bdev);
686 if (!ret)
687 ret = err;
688 inode_unlock(inode);
689 return ret;
690}
691
692static const struct file_operations hfs_file_operations = {
693 .llseek = generic_file_llseek,
694 .read_iter = generic_file_read_iter,
695 .write_iter = generic_file_write_iter,
696 .mmap = generic_file_mmap,
697 .splice_read = generic_file_splice_read,
698 .fsync = hfs_file_fsync,
699 .open = hfs_file_open,
700 .release = hfs_file_release,
701};
702
703static const struct inode_operations hfs_file_inode_operations = {
704 .lookup = hfs_file_lookup,
705 .setattr = hfs_inode_setattr,
706 .listxattr = generic_listxattr,
707};