1 /*
2 * linux/fs/hfs/inode.c
3 *
4 * Copyright (C) 1995-1997 Paul H. Hargrove
5 * (C) 2003 Ardis Technologies <roman@ardistech.com>
6 * This file may be distributed under the terms of the GNU General Public License.
7 *
8 * This file contains inode-related functions which do not depend on
9 * which scheme is being used to represent forks.
10 *
11 * Based on the minix file system code, (C) 1991, 1992 by Linus Torvalds
12 */
13
14 #include <linux/pagemap.h>
15 #include <linux/mpage.h>
16 #include <linux/sched.h>
17 #include <linux/cred.h>
18 #include <linux/uio.h>
19 #include <linux/xattr.h>
20 #include <linux/blkdev.h>
21
22 #include "hfs_fs.h"
23 #include "btree.h"
24
25 static const struct file_operations hfs_file_operations;
26 static const struct inode_operations hfs_file_inode_operations;
27
28 /*================ Variable-like macros ================*/
29
30 #define HFS_VALID_MODE_BITS (S_IFREG | S_IFDIR | S_IRWXUGO)
31
hfs_writepage(struct page * page,struct writeback_control * wbc)32 static int hfs_writepage(struct page *page, struct writeback_control *wbc)
33 {
34 return block_write_full_page(page, hfs_get_block, wbc);
35 }
36
hfs_read_folio(struct file * file,struct folio * folio)37 static int hfs_read_folio(struct file *file, struct folio *folio)
38 {
39 return block_read_full_folio(folio, hfs_get_block);
40 }
41
hfs_write_failed(struct address_space * mapping,loff_t to)42 static void hfs_write_failed(struct address_space *mapping, loff_t to)
43 {
44 struct inode *inode = mapping->host;
45
46 if (to > inode->i_size) {
47 truncate_pagecache(inode, inode->i_size);
48 hfs_file_truncate(inode);
49 }
50 }
51
hfs_write_begin(struct file * file,struct address_space * mapping,loff_t pos,unsigned len,struct page ** pagep,void ** fsdata)52 int 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
hfs_bmap(struct address_space * mapping,sector_t block)67 static sector_t hfs_bmap(struct address_space *mapping, sector_t block)
68 {
69 return generic_block_bmap(mapping, block, hfs_get_block);
70 }
71
hfs_release_folio(struct folio * folio,gfp_t mask)72 static 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
hfs_direct_IO(struct kiocb * iocb,struct iov_iter * iter)130 static ssize_t hfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
131 {
132 struct file *file = iocb->ki_filp;
133 struct address_space *mapping = file->f_mapping;
134 struct inode *inode = mapping->host;
135 size_t count = iov_iter_count(iter);
136 ssize_t ret;
137
138 ret = blockdev_direct_IO(iocb, inode, iter, hfs_get_block);
139
140 /*
141 * In case of error extending write may have instantiated a few
142 * blocks outside i_size. Trim these off again.
143 */
144 if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) {
145 loff_t isize = i_size_read(inode);
146 loff_t end = iocb->ki_pos + count;
147
148 if (end > isize)
149 hfs_write_failed(mapping, end);
150 }
151
152 return ret;
153 }
154
hfs_writepages(struct address_space * mapping,struct writeback_control * wbc)155 static int hfs_writepages(struct address_space *mapping,
156 struct writeback_control *wbc)
157 {
158 return mpage_writepages(mapping, wbc, hfs_get_block);
159 }
160
161 const struct address_space_operations hfs_btree_aops = {
162 .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
172 const 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 */
hfs_new_inode(struct inode * dir,const struct qstr * name,umode_t mode)187 struct 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_set_ctime_current(inode);
204 HFS_I(inode)->flags = 0;
205 HFS_I(inode)->rsrc_inode = NULL;
206 HFS_I(inode)->fs_blocks = 0;
207 HFS_I(inode)->tz_secondswest = sys_tz.tz_minuteswest * 60;
208 if (S_ISDIR(mode)) {
209 inode->i_size = 2;
210 HFS_SB(sb)->folder_count++;
211 if (dir->i_ino == HFS_ROOT_CNID)
212 HFS_SB(sb)->root_dirs++;
213 inode->i_op = &hfs_dir_inode_operations;
214 inode->i_fop = &hfs_dir_operations;
215 inode->i_mode |= S_IRWXUGO;
216 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_dir_umask;
217 } else if (S_ISREG(mode)) {
218 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
219 HFS_SB(sb)->file_count++;
220 if (dir->i_ino == HFS_ROOT_CNID)
221 HFS_SB(sb)->root_files++;
222 inode->i_op = &hfs_file_inode_operations;
223 inode->i_fop = &hfs_file_operations;
224 inode->i_mapping->a_ops = &hfs_aops;
225 inode->i_mode |= S_IRUGO|S_IXUGO;
226 if (mode & S_IWUSR)
227 inode->i_mode |= S_IWUGO;
228 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_file_umask;
229 HFS_I(inode)->phys_size = 0;
230 HFS_I(inode)->alloc_blocks = 0;
231 HFS_I(inode)->first_blocks = 0;
232 HFS_I(inode)->cached_start = 0;
233 HFS_I(inode)->cached_blocks = 0;
234 memset(HFS_I(inode)->first_extents, 0, sizeof(hfs_extent_rec));
235 memset(HFS_I(inode)->cached_extents, 0, sizeof(hfs_extent_rec));
236 }
237 insert_inode_hash(inode);
238 mark_inode_dirty(inode);
239 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
240 hfs_mark_mdb_dirty(sb);
241
242 return inode;
243 }
244
hfs_delete_inode(struct inode * inode)245 void hfs_delete_inode(struct inode *inode)
246 {
247 struct super_block *sb = inode->i_sb;
248
249 hfs_dbg(INODE, "delete_inode: %lu\n", inode->i_ino);
250 if (S_ISDIR(inode->i_mode)) {
251 HFS_SB(sb)->folder_count--;
252 if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
253 HFS_SB(sb)->root_dirs--;
254 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
255 hfs_mark_mdb_dirty(sb);
256 return;
257 }
258 HFS_SB(sb)->file_count--;
259 if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
260 HFS_SB(sb)->root_files--;
261 if (S_ISREG(inode->i_mode)) {
262 if (!inode->i_nlink) {
263 inode->i_size = 0;
264 hfs_file_truncate(inode);
265 }
266 }
267 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
268 hfs_mark_mdb_dirty(sb);
269 }
270
hfs_inode_read_fork(struct inode * inode,struct hfs_extent * ext,__be32 __log_size,__be32 phys_size,u32 clump_size)271 void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext,
272 __be32 __log_size, __be32 phys_size, u32 clump_size)
273 {
274 struct super_block *sb = inode->i_sb;
275 u32 log_size = be32_to_cpu(__log_size);
276 u16 count;
277 int i;
278
279 memcpy(HFS_I(inode)->first_extents, ext, sizeof(hfs_extent_rec));
280 for (count = 0, i = 0; i < 3; i++)
281 count += be16_to_cpu(ext[i].count);
282 HFS_I(inode)->first_blocks = count;
283 HFS_I(inode)->cached_start = 0;
284 HFS_I(inode)->cached_blocks = 0;
285
286 inode->i_size = HFS_I(inode)->phys_size = log_size;
287 HFS_I(inode)->fs_blocks = (log_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
288 inode_set_bytes(inode, HFS_I(inode)->fs_blocks << sb->s_blocksize_bits);
289 HFS_I(inode)->alloc_blocks = be32_to_cpu(phys_size) /
290 HFS_SB(sb)->alloc_blksz;
291 HFS_I(inode)->clump_blocks = clump_size / HFS_SB(sb)->alloc_blksz;
292 if (!HFS_I(inode)->clump_blocks)
293 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
294 }
295
296 struct hfs_iget_data {
297 struct hfs_cat_key *key;
298 hfs_cat_rec *rec;
299 };
300
hfs_test_inode(struct inode * inode,void * data)301 static int hfs_test_inode(struct inode *inode, void *data)
302 {
303 struct hfs_iget_data *idata = data;
304 hfs_cat_rec *rec;
305
306 rec = idata->rec;
307 switch (rec->type) {
308 case HFS_CDR_DIR:
309 return inode->i_ino == be32_to_cpu(rec->dir.DirID);
310 case HFS_CDR_FIL:
311 return inode->i_ino == be32_to_cpu(rec->file.FlNum);
312 default:
313 BUG();
314 return 1;
315 }
316 }
317
318 /*
319 * hfs_read_inode
320 */
hfs_read_inode(struct inode * inode,void * data)321 static int hfs_read_inode(struct inode *inode, void *data)
322 {
323 struct hfs_iget_data *idata = data;
324 struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
325 hfs_cat_rec *rec;
326
327 HFS_I(inode)->flags = 0;
328 HFS_I(inode)->rsrc_inode = NULL;
329 mutex_init(&HFS_I(inode)->extents_lock);
330 INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
331 spin_lock_init(&HFS_I(inode)->open_dir_lock);
332
333 /* Initialize the inode */
334 inode->i_uid = hsb->s_uid;
335 inode->i_gid = hsb->s_gid;
336 set_nlink(inode, 1);
337
338 if (idata->key)
339 HFS_I(inode)->cat_key = *idata->key;
340 else
341 HFS_I(inode)->flags |= HFS_FLG_RSRC;
342 HFS_I(inode)->tz_secondswest = sys_tz.tz_minuteswest * 60;
343
344 rec = idata->rec;
345 switch (rec->type) {
346 case HFS_CDR_FIL:
347 if (!HFS_IS_RSRC(inode)) {
348 hfs_inode_read_fork(inode, rec->file.ExtRec, rec->file.LgLen,
349 rec->file.PyLen, be16_to_cpu(rec->file.ClpSize));
350 } else {
351 hfs_inode_read_fork(inode, rec->file.RExtRec, rec->file.RLgLen,
352 rec->file.RPyLen, be16_to_cpu(rec->file.ClpSize));
353 }
354
355 inode->i_ino = be32_to_cpu(rec->file.FlNum);
356 inode->i_mode = S_IRUGO | S_IXUGO;
357 if (!(rec->file.Flags & HFS_FIL_LOCK))
358 inode->i_mode |= S_IWUGO;
359 inode->i_mode &= ~hsb->s_file_umask;
360 inode->i_mode |= S_IFREG;
361 inode->i_atime = inode->i_mtime = inode_set_ctime_to_ts(inode,
362 hfs_m_to_utime(rec->file.MdDat));
363 inode->i_op = &hfs_file_inode_operations;
364 inode->i_fop = &hfs_file_operations;
365 inode->i_mapping->a_ops = &hfs_aops;
366 break;
367 case HFS_CDR_DIR:
368 inode->i_ino = be32_to_cpu(rec->dir.DirID);
369 inode->i_size = be16_to_cpu(rec->dir.Val) + 2;
370 HFS_I(inode)->fs_blocks = 0;
371 inode->i_mode = S_IFDIR | (S_IRWXUGO & ~hsb->s_dir_umask);
372 inode->i_atime = inode->i_mtime = inode_set_ctime_to_ts(inode,
373 hfs_m_to_utime(rec->dir.MdDat));
374 inode->i_op = &hfs_dir_inode_operations;
375 inode->i_fop = &hfs_dir_operations;
376 break;
377 default:
378 make_bad_inode(inode);
379 }
380 return 0;
381 }
382
383 /*
384 * __hfs_iget()
385 *
386 * Given the MDB for a HFS filesystem, a 'key' and an 'entry' in
387 * the catalog B-tree and the 'type' of the desired file return the
388 * inode for that file/directory or NULL. Note that 'type' indicates
389 * whether we want the actual file or directory, or the corresponding
390 * metadata (AppleDouble header file or CAP metadata file).
391 */
hfs_iget(struct super_block * sb,struct hfs_cat_key * key,hfs_cat_rec * rec)392 struct inode *hfs_iget(struct super_block *sb, struct hfs_cat_key *key, hfs_cat_rec *rec)
393 {
394 struct hfs_iget_data data = { key, rec };
395 struct inode *inode;
396 u32 cnid;
397
398 switch (rec->type) {
399 case HFS_CDR_DIR:
400 cnid = be32_to_cpu(rec->dir.DirID);
401 break;
402 case HFS_CDR_FIL:
403 cnid = be32_to_cpu(rec->file.FlNum);
404 break;
405 default:
406 return NULL;
407 }
408 inode = iget5_locked(sb, cnid, hfs_test_inode, hfs_read_inode, &data);
409 if (inode && (inode->i_state & I_NEW))
410 unlock_new_inode(inode);
411 return inode;
412 }
413
hfs_inode_write_fork(struct inode * inode,struct hfs_extent * ext,__be32 * log_size,__be32 * phys_size)414 void hfs_inode_write_fork(struct inode *inode, struct hfs_extent *ext,
415 __be32 *log_size, __be32 *phys_size)
416 {
417 memcpy(ext, HFS_I(inode)->first_extents, sizeof(hfs_extent_rec));
418
419 if (log_size)
420 *log_size = cpu_to_be32(inode->i_size);
421 if (phys_size)
422 *phys_size = cpu_to_be32(HFS_I(inode)->alloc_blocks *
423 HFS_SB(inode->i_sb)->alloc_blksz);
424 }
425
hfs_write_inode(struct inode * inode,struct writeback_control * wbc)426 int hfs_write_inode(struct inode *inode, struct writeback_control *wbc)
427 {
428 struct inode *main_inode = inode;
429 struct hfs_find_data fd;
430 hfs_cat_rec rec;
431 int res;
432
433 hfs_dbg(INODE, "hfs_write_inode: %lu\n", inode->i_ino);
434 res = hfs_ext_write_extent(inode);
435 if (res)
436 return res;
437
438 if (inode->i_ino < HFS_FIRSTUSER_CNID) {
439 switch (inode->i_ino) {
440 case HFS_ROOT_CNID:
441 break;
442 case HFS_EXT_CNID:
443 hfs_btree_write(HFS_SB(inode->i_sb)->ext_tree);
444 return 0;
445 case HFS_CAT_CNID:
446 hfs_btree_write(HFS_SB(inode->i_sb)->cat_tree);
447 return 0;
448 default:
449 BUG();
450 return -EIO;
451 }
452 }
453
454 if (HFS_IS_RSRC(inode))
455 main_inode = HFS_I(inode)->rsrc_inode;
456
457 if (!main_inode->i_nlink)
458 return 0;
459
460 if (hfs_find_init(HFS_SB(main_inode->i_sb)->cat_tree, &fd))
461 /* panic? */
462 return -EIO;
463
464 res = -EIO;
465 if (HFS_I(main_inode)->cat_key.CName.len > HFS_NAMELEN)
466 goto out;
467 fd.search_key->cat = HFS_I(main_inode)->cat_key;
468 if (hfs_brec_find(&fd))
469 goto out;
470
471 if (S_ISDIR(main_inode->i_mode)) {
472 if (fd.entrylength < sizeof(struct hfs_cat_dir))
473 goto out;
474 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
475 sizeof(struct hfs_cat_dir));
476 if (rec.type != HFS_CDR_DIR ||
477 be32_to_cpu(rec.dir.DirID) != inode->i_ino) {
478 }
479
480 rec.dir.MdDat = hfs_u_to_mtime(inode->i_mtime);
481 rec.dir.Val = cpu_to_be16(inode->i_size - 2);
482
483 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
484 sizeof(struct hfs_cat_dir));
485 } else if (HFS_IS_RSRC(inode)) {
486 if (fd.entrylength < sizeof(struct hfs_cat_file))
487 goto out;
488 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
489 sizeof(struct hfs_cat_file));
490 hfs_inode_write_fork(inode, rec.file.RExtRec,
491 &rec.file.RLgLen, &rec.file.RPyLen);
492 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
493 sizeof(struct hfs_cat_file));
494 } else {
495 if (fd.entrylength < sizeof(struct hfs_cat_file))
496 goto out;
497 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
498 sizeof(struct hfs_cat_file));
499 if (rec.type != HFS_CDR_FIL ||
500 be32_to_cpu(rec.file.FlNum) != inode->i_ino) {
501 }
502
503 if (inode->i_mode & S_IWUSR)
504 rec.file.Flags &= ~HFS_FIL_LOCK;
505 else
506 rec.file.Flags |= HFS_FIL_LOCK;
507 hfs_inode_write_fork(inode, rec.file.ExtRec, &rec.file.LgLen, &rec.file.PyLen);
508 rec.file.MdDat = hfs_u_to_mtime(inode->i_mtime);
509
510 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
511 sizeof(struct hfs_cat_file));
512 }
513 res = 0;
514 out:
515 hfs_find_exit(&fd);
516 return res;
517 }
518
hfs_file_lookup(struct inode * dir,struct dentry * dentry,unsigned int flags)519 static struct dentry *hfs_file_lookup(struct inode *dir, struct dentry *dentry,
520 unsigned int flags)
521 {
522 struct inode *inode = NULL;
523 hfs_cat_rec rec;
524 struct hfs_find_data fd;
525 int res;
526
527 if (HFS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc"))
528 goto out;
529
530 inode = HFS_I(dir)->rsrc_inode;
531 if (inode)
532 goto out;
533
534 inode = new_inode(dir->i_sb);
535 if (!inode)
536 return ERR_PTR(-ENOMEM);
537
538 res = hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd);
539 if (res) {
540 iput(inode);
541 return ERR_PTR(res);
542 }
543 fd.search_key->cat = HFS_I(dir)->cat_key;
544 res = hfs_brec_read(&fd, &rec, sizeof(rec));
545 if (!res) {
546 struct hfs_iget_data idata = { NULL, &rec };
547 hfs_read_inode(inode, &idata);
548 }
549 hfs_find_exit(&fd);
550 if (res) {
551 iput(inode);
552 return ERR_PTR(res);
553 }
554 HFS_I(inode)->rsrc_inode = dir;
555 HFS_I(dir)->rsrc_inode = inode;
556 igrab(dir);
557 inode_fake_hash(inode);
558 mark_inode_dirty(inode);
559 dont_mount(dentry);
560 out:
561 return d_splice_alias(inode, dentry);
562 }
563
hfs_evict_inode(struct inode * inode)564 void hfs_evict_inode(struct inode *inode)
565 {
566 truncate_inode_pages_final(&inode->i_data);
567 clear_inode(inode);
568 if (HFS_IS_RSRC(inode) && HFS_I(inode)->rsrc_inode) {
569 HFS_I(HFS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
570 iput(HFS_I(inode)->rsrc_inode);
571 }
572 }
573
hfs_file_open(struct inode * inode,struct file * file)574 static int hfs_file_open(struct inode *inode, struct file *file)
575 {
576 if (HFS_IS_RSRC(inode))
577 inode = HFS_I(inode)->rsrc_inode;
578 atomic_inc(&HFS_I(inode)->opencnt);
579 return 0;
580 }
581
hfs_file_release(struct inode * inode,struct file * file)582 static int hfs_file_release(struct inode *inode, struct file *file)
583 {
584 //struct super_block *sb = inode->i_sb;
585
586 if (HFS_IS_RSRC(inode))
587 inode = HFS_I(inode)->rsrc_inode;
588 if (atomic_dec_and_test(&HFS_I(inode)->opencnt)) {
589 inode_lock(inode);
590 hfs_file_truncate(inode);
591 //if (inode->i_flags & S_DEAD) {
592 // hfs_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
593 // hfs_delete_inode(inode);
594 //}
595 inode_unlock(inode);
596 }
597 return 0;
598 }
599
600 /*
601 * hfs_notify_change()
602 *
603 * Based very closely on fs/msdos/inode.c by Werner Almesberger
604 *
605 * This is the notify_change() field in the super_operations structure
606 * for HFS file systems. The purpose is to take that changes made to
607 * an inode and apply then in a filesystem-dependent manner. In this
608 * case the process has a few of tasks to do:
609 * 1) prevent changes to the i_uid and i_gid fields.
610 * 2) map file permissions to the closest allowable permissions
611 * 3) Since multiple Linux files can share the same on-disk inode under
612 * HFS (for instance the data and resource forks of a file) a change
613 * to permissions must be applied to all other in-core inodes which
614 * correspond to the same HFS file.
615 */
616
hfs_inode_setattr(struct mnt_idmap * idmap,struct dentry * dentry,struct iattr * attr)617 int hfs_inode_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
618 struct iattr *attr)
619 {
620 struct inode *inode = d_inode(dentry);
621 struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
622 int error;
623
624 error = setattr_prepare(&nop_mnt_idmap, dentry,
625 attr); /* basic permission checks */
626 if (error)
627 return error;
628
629 /* no uig/gid changes and limit which mode bits can be set */
630 if (((attr->ia_valid & ATTR_UID) &&
631 (!uid_eq(attr->ia_uid, hsb->s_uid))) ||
632 ((attr->ia_valid & ATTR_GID) &&
633 (!gid_eq(attr->ia_gid, hsb->s_gid))) ||
634 ((attr->ia_valid & ATTR_MODE) &&
635 ((S_ISDIR(inode->i_mode) &&
636 (attr->ia_mode != inode->i_mode)) ||
637 (attr->ia_mode & ~HFS_VALID_MODE_BITS)))) {
638 return hsb->s_quiet ? 0 : error;
639 }
640
641 if (attr->ia_valid & ATTR_MODE) {
642 /* Only the 'w' bits can ever change and only all together. */
643 if (attr->ia_mode & S_IWUSR)
644 attr->ia_mode = inode->i_mode | S_IWUGO;
645 else
646 attr->ia_mode = inode->i_mode & ~S_IWUGO;
647 attr->ia_mode &= S_ISDIR(inode->i_mode) ? ~hsb->s_dir_umask: ~hsb->s_file_umask;
648 }
649
650 if ((attr->ia_valid & ATTR_SIZE) &&
651 attr->ia_size != i_size_read(inode)) {
652 inode_dio_wait(inode);
653
654 error = inode_newsize_ok(inode, attr->ia_size);
655 if (error)
656 return error;
657
658 truncate_setsize(inode, attr->ia_size);
659 hfs_file_truncate(inode);
660 inode->i_atime = inode->i_mtime = inode_set_ctime_current(inode);
661 }
662
663 setattr_copy(&nop_mnt_idmap, inode, attr);
664 mark_inode_dirty(inode);
665 return 0;
666 }
667
hfs_file_fsync(struct file * filp,loff_t start,loff_t end,int datasync)668 static int hfs_file_fsync(struct file *filp, loff_t start, loff_t end,
669 int datasync)
670 {
671 struct inode *inode = filp->f_mapping->host;
672 struct super_block * sb;
673 int ret, err;
674
675 ret = file_write_and_wait_range(filp, start, end);
676 if (ret)
677 return ret;
678 inode_lock(inode);
679
680 /* sync the inode to buffers */
681 ret = write_inode_now(inode, 0);
682
683 /* sync the superblock to buffers */
684 sb = inode->i_sb;
685 flush_delayed_work(&HFS_SB(sb)->mdb_work);
686 /* .. finally sync the buffers to disk */
687 err = sync_blockdev(sb->s_bdev);
688 if (!ret)
689 ret = err;
690 inode_unlock(inode);
691 return ret;
692 }
693
694 static const struct file_operations hfs_file_operations = {
695 .llseek = generic_file_llseek,
696 .read_iter = generic_file_read_iter,
697 .write_iter = generic_file_write_iter,
698 .mmap = generic_file_mmap,
699 .splice_read = filemap_splice_read,
700 .fsync = hfs_file_fsync,
701 .open = hfs_file_open,
702 .release = hfs_file_release,
703 };
704
705 static const struct inode_operations hfs_file_inode_operations = {
706 .lookup = hfs_file_lookup,
707 .setattr = hfs_inode_setattr,
708 .listxattr = generic_listxattr,
709 };
710