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