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 | |
32 | static int hfs_writepage(struct page *page, struct writeback_control *wbc) |
33 | { |
34 | return block_write_full_page(page, get_block: hfs_get_block, wbc); |
35 | } |
36 | |
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 | |
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, new: inode->i_size); |
48 | hfs_file_truncate(inode); |
49 | } |
50 | } |
51 | |
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, to: pos + len); |
63 | |
64 | return ret; |
65 | } |
66 | |
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 | |
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(lock: &tree->hash_lock); |
100 | node = hfs_bnode_findhash(tree, nidx); |
101 | if (!node) |
102 | ; |
103 | else if (atomic_read(v: &node->refcnt)) |
104 | res = false; |
105 | if (res && node) { |
106 | hfs_bnode_unhash(node); |
107 | hfs_bnode_free(node); |
108 | } |
109 | spin_unlock(lock: &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(lock: &tree->hash_lock); |
114 | do { |
115 | node = hfs_bnode_findhash(tree, nidx++); |
116 | if (!node) |
117 | continue; |
118 | if (atomic_read(v: &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(lock: &tree->hash_lock); |
126 | } |
127 | return res ? try_to_free_buffers(folio) : false; |
128 | } |
129 | |
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(i: iter); |
136 | ssize_t ret; |
137 | |
138 | ret = blockdev_direct_IO(iocb, inode, iter, get_block: 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, to: end); |
150 | } |
151 | |
152 | return ret; |
153 | } |
154 | |
155 | static int hfs_writepages(struct address_space *mapping, |
156 | struct writeback_control *wbc) |
157 | { |
158 | return mpage_writepages(mapping, wbc, get_block: 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 | */ |
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(list: &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, nlink: 1); |
203 | simple_inode_init_ts(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, addr: &HFS_SB(sb)->flags); |
239 | hfs_mark_mdb_dirty(sb); |
240 | |
241 | return inode; |
242 | } |
243 | |
244 | void 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, addr: &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, addr: &HFS_SB(sb)->flags); |
267 | hfs_mark_mdb_dirty(sb); |
268 | } |
269 | |
270 | void 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 | |
293 | struct hfs_iget_data { |
294 | struct hfs_cat_key *key; |
295 | hfs_cat_rec *rec; |
296 | }; |
297 | |
298 | static 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 | */ |
318 | static 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(list: &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, nlink: 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, ext: rec->file.ExtRec, log_size: rec->file.LgLen, |
346 | phys_size: rec->file.PyLen, be16_to_cpu(rec->file.ClpSize)); |
347 | } else { |
348 | hfs_inode_read_fork(inode, ext: rec->file.RExtRec, log_size: rec->file.RLgLen, |
349 | phys_size: 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_set_mtime_to_ts(inode, |
359 | ts: inode_set_atime_to_ts(inode, ts: inode_set_ctime_to_ts(inode, 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_set_mtime_to_ts(inode, |
370 | ts: inode_set_atime_to_ts(inode, ts: inode_set_ctime_to_ts(inode, 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 | */ |
389 | struct 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, test: hfs_test_inode, set: hfs_read_inode, &data); |
406 | if (inode && (inode->i_state & I_NEW)) |
407 | unlock_new_inode(inode); |
408 | return inode; |
409 | } |
410 | |
411 | void 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 | |
423 | int 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_get_mtime(inode)); |
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, ext: rec.file.RExtRec, |
488 | log_size: &rec.file.RLgLen, phys_size: &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, ext: rec.file.ExtRec, log_size: &rec.file.LgLen, phys_size: &rec.file.PyLen); |
505 | rec.file.MdDat = hfs_u_to_mtime(inode_get_mtime(inode)); |
506 | |
507 | hfs_bnode_write(fd.bnode, &rec, fd.entryoffset, |
508 | sizeof(struct hfs_cat_file)); |
509 | } |
510 | res = 0; |
511 | out: |
512 | hfs_find_exit(&fd); |
513 | return res; |
514 | } |
515 | |
516 | static 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(sb: dir->i_sb); |
532 | if (!inode) |
533 | return ERR_PTR(error: -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(error: 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, data: &idata); |
545 | } |
546 | hfs_find_exit(&fd); |
547 | if (res) { |
548 | iput(inode); |
549 | return ERR_PTR(error: 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); |
557 | out: |
558 | return d_splice_alias(inode, dentry); |
559 | } |
560 | |
561 | void 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 | |
571 | static 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(v: &HFS_I(inode)->opencnt); |
576 | return 0; |
577 | } |
578 | |
579 | static 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(v: &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 | |
614 | int hfs_inode_setattr(struct mnt_idmap *idmap, 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(&nop_mnt_idmap, 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(left: attr->ia_uid, right: hsb->s_uid))) || |
629 | ((attr->ia_valid & ATTR_GID) && |
630 | (!gid_eq(left: attr->ia_gid, right: 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, offset: attr->ia_size); |
652 | if (error) |
653 | return error; |
654 | |
655 | truncate_setsize(inode, newsize: attr->ia_size); |
656 | hfs_file_truncate(inode); |
657 | simple_inode_init_ts(inode); |
658 | } |
659 | |
660 | setattr_copy(&nop_mnt_idmap, inode, attr); |
661 | mark_inode_dirty(inode); |
662 | return 0; |
663 | } |
664 | |
665 | static int hfs_file_fsync(struct file *filp, loff_t start, loff_t end, |
666 | int datasync) |
667 | { |
668 | struct inode *inode = filp->f_mapping->host; |
669 | struct super_block * sb; |
670 | int ret, err; |
671 | |
672 | ret = file_write_and_wait_range(file: filp, start, end); |
673 | if (ret) |
674 | return ret; |
675 | inode_lock(inode); |
676 | |
677 | /* sync the inode to buffers */ |
678 | ret = write_inode_now(inode, sync: 0); |
679 | |
680 | /* sync the superblock to buffers */ |
681 | sb = inode->i_sb; |
682 | flush_delayed_work(dwork: &HFS_SB(sb)->mdb_work); |
683 | /* .. finally sync the buffers to disk */ |
684 | err = sync_blockdev(bdev: sb->s_bdev); |
685 | if (!ret) |
686 | ret = err; |
687 | inode_unlock(inode); |
688 | return ret; |
689 | } |
690 | |
691 | static const struct file_operations hfs_file_operations = { |
692 | .llseek = generic_file_llseek, |
693 | .read_iter = generic_file_read_iter, |
694 | .write_iter = generic_file_write_iter, |
695 | .mmap = generic_file_mmap, |
696 | .splice_read = filemap_splice_read, |
697 | .fsync = hfs_file_fsync, |
698 | .open = hfs_file_open, |
699 | .release = hfs_file_release, |
700 | }; |
701 | |
702 | static const struct inode_operations hfs_file_inode_operations = { |
703 | .lookup = hfs_file_lookup, |
704 | .setattr = hfs_inode_setattr, |
705 | .listxattr = generic_listxattr, |
706 | }; |
707 | |