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