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