Commit | Line | Data |
---|---|---|
127e5f5a VD |
1 | /* |
2 | * linux/fs/hfsplus/xattr.c | |
3 | * | |
4 | * Vyacheslav Dubeyko <slava@dubeyko.com> | |
5 | * | |
6 | * Logic of processing extended attributes | |
7 | */ | |
8 | ||
9 | #include "hfsplus_fs.h" | |
10 | #include "xattr.h" | |
b4c1107c | 11 | #include "acl.h" |
127e5f5a VD |
12 | |
13 | const struct xattr_handler *hfsplus_xattr_handlers[] = { | |
14 | &hfsplus_xattr_osx_handler, | |
15 | &hfsplus_xattr_user_handler, | |
16 | &hfsplus_xattr_trusted_handler, | |
b4c1107c VD |
17 | #ifdef CONFIG_HFSPLUS_FS_POSIX_ACL |
18 | &hfsplus_xattr_acl_access_handler, | |
19 | &hfsplus_xattr_acl_default_handler, | |
20 | #endif | |
127e5f5a VD |
21 | &hfsplus_xattr_security_handler, |
22 | NULL | |
23 | }; | |
24 | ||
25 | static int strcmp_xattr_finder_info(const char *name) | |
26 | { | |
27 | if (name) { | |
28 | return strncmp(name, HFSPLUS_XATTR_FINDER_INFO_NAME, | |
29 | sizeof(HFSPLUS_XATTR_FINDER_INFO_NAME)); | |
30 | } | |
31 | return -1; | |
32 | } | |
33 | ||
34 | static int strcmp_xattr_acl(const char *name) | |
35 | { | |
36 | if (name) { | |
37 | return strncmp(name, HFSPLUS_XATTR_ACL_NAME, | |
38 | sizeof(HFSPLUS_XATTR_ACL_NAME)); | |
39 | } | |
40 | return -1; | |
41 | } | |
42 | ||
43 | static inline int is_known_namespace(const char *name) | |
44 | { | |
45 | if (strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN) && | |
46 | strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN) && | |
47 | strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) && | |
48 | strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN)) | |
49 | return false; | |
50 | ||
51 | return true; | |
52 | } | |
53 | ||
b4c1107c VD |
54 | static int can_set_system_xattr(struct inode *inode, const char *name, |
55 | const void *value, size_t size) | |
56 | { | |
57 | #ifdef CONFIG_HFSPLUS_FS_POSIX_ACL | |
58 | struct posix_acl *acl; | |
59 | int err; | |
60 | ||
61 | if (!inode_owner_or_capable(inode)) | |
62 | return -EPERM; | |
63 | ||
64 | /* | |
65 | * POSIX_ACL_XATTR_ACCESS is tied to i_mode | |
66 | */ | |
67 | if (strcmp(name, POSIX_ACL_XATTR_ACCESS) == 0) { | |
68 | acl = posix_acl_from_xattr(&init_user_ns, value, size); | |
69 | if (IS_ERR(acl)) | |
70 | return PTR_ERR(acl); | |
71 | if (acl) { | |
72 | err = posix_acl_equiv_mode(acl, &inode->i_mode); | |
73 | posix_acl_release(acl); | |
74 | if (err < 0) | |
75 | return err; | |
76 | mark_inode_dirty(inode); | |
77 | } | |
78 | /* | |
79 | * We're changing the ACL. Get rid of the cached one | |
80 | */ | |
81 | forget_cached_acl(inode, ACL_TYPE_ACCESS); | |
82 | ||
83 | return 0; | |
84 | } else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0) { | |
85 | acl = posix_acl_from_xattr(&init_user_ns, value, size); | |
86 | if (IS_ERR(acl)) | |
87 | return PTR_ERR(acl); | |
88 | posix_acl_release(acl); | |
89 | ||
90 | /* | |
91 | * We're changing the default ACL. Get rid of the cached one | |
92 | */ | |
93 | forget_cached_acl(inode, ACL_TYPE_DEFAULT); | |
94 | ||
95 | return 0; | |
96 | } | |
97 | #endif /* CONFIG_HFSPLUS_FS_POSIX_ACL */ | |
98 | return -EOPNOTSUPP; | |
99 | } | |
100 | ||
127e5f5a VD |
101 | static int can_set_xattr(struct inode *inode, const char *name, |
102 | const void *value, size_t value_len) | |
103 | { | |
104 | if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN)) | |
b4c1107c | 105 | return can_set_system_xattr(inode, name, value, value_len); |
127e5f5a VD |
106 | |
107 | if (!strncmp(name, XATTR_MAC_OSX_PREFIX, XATTR_MAC_OSX_PREFIX_LEN)) { | |
108 | /* | |
109 | * This makes sure that we aren't trying to set an | |
110 | * attribute in a different namespace by prefixing it | |
111 | * with "osx." | |
112 | */ | |
113 | if (is_known_namespace(name + XATTR_MAC_OSX_PREFIX_LEN)) | |
114 | return -EOPNOTSUPP; | |
115 | ||
116 | return 0; | |
117 | } | |
118 | ||
119 | /* | |
120 | * Don't allow setting an attribute in an unknown namespace. | |
121 | */ | |
122 | if (strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) && | |
123 | strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) && | |
124 | strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)) | |
125 | return -EOPNOTSUPP; | |
126 | ||
127 | return 0; | |
128 | } | |
129 | ||
099e9245 VD |
130 | static void hfsplus_init_header_node(struct inode *attr_file, |
131 | u32 clump_size, | |
a99b7069 | 132 | char *buf, u16 node_size) |
099e9245 VD |
133 | { |
134 | struct hfs_bnode_desc *desc; | |
135 | struct hfs_btree_header_rec *head; | |
136 | u16 offset; | |
137 | __be16 *rec_offsets; | |
138 | u32 hdr_node_map_rec_bits; | |
139 | char *bmp; | |
140 | u32 used_nodes; | |
141 | u32 used_bmp_bytes; | |
a99b7069 | 142 | loff_t tmp; |
099e9245 | 143 | |
a99b7069 | 144 | hfs_dbg(ATTR_MOD, "init_hdr_attr_file: clump %u, node_size %u\n", |
099e9245 VD |
145 | clump_size, node_size); |
146 | ||
147 | /* The end of the node contains list of record offsets */ | |
148 | rec_offsets = (__be16 *)(buf + node_size); | |
149 | ||
150 | desc = (struct hfs_bnode_desc *)buf; | |
151 | desc->type = HFS_NODE_HEADER; | |
152 | desc->num_recs = cpu_to_be16(HFSPLUS_BTREE_HDR_NODE_RECS_COUNT); | |
153 | offset = sizeof(struct hfs_bnode_desc); | |
154 | *--rec_offsets = cpu_to_be16(offset); | |
155 | ||
156 | head = (struct hfs_btree_header_rec *)(buf + offset); | |
157 | head->node_size = cpu_to_be16(node_size); | |
a99b7069 GU |
158 | tmp = i_size_read(attr_file); |
159 | do_div(tmp, node_size); | |
160 | head->node_count = cpu_to_be32(tmp); | |
099e9245 VD |
161 | head->free_nodes = cpu_to_be32(be32_to_cpu(head->node_count) - 1); |
162 | head->clump_size = cpu_to_be32(clump_size); | |
163 | head->attributes |= cpu_to_be32(HFS_TREE_BIGKEYS | HFS_TREE_VARIDXKEYS); | |
164 | head->max_key_len = cpu_to_be16(HFSPLUS_ATTR_KEYLEN - sizeof(u16)); | |
165 | offset += sizeof(struct hfs_btree_header_rec); | |
166 | *--rec_offsets = cpu_to_be16(offset); | |
167 | offset += HFSPLUS_BTREE_HDR_USER_BYTES; | |
168 | *--rec_offsets = cpu_to_be16(offset); | |
169 | ||
170 | hdr_node_map_rec_bits = 8 * (node_size - offset - (4 * sizeof(u16))); | |
171 | if (be32_to_cpu(head->node_count) > hdr_node_map_rec_bits) { | |
172 | u32 map_node_bits; | |
173 | u32 map_nodes; | |
174 | ||
175 | desc->next = cpu_to_be32(be32_to_cpu(head->leaf_tail) + 1); | |
176 | map_node_bits = 8 * (node_size - sizeof(struct hfs_bnode_desc) - | |
177 | (2 * sizeof(u16)) - 2); | |
178 | map_nodes = (be32_to_cpu(head->node_count) - | |
179 | hdr_node_map_rec_bits + | |
180 | (map_node_bits - 1)) / map_node_bits; | |
181 | be32_add_cpu(&head->free_nodes, 0 - map_nodes); | |
182 | } | |
183 | ||
184 | bmp = buf + offset; | |
185 | used_nodes = | |
186 | be32_to_cpu(head->node_count) - be32_to_cpu(head->free_nodes); | |
187 | used_bmp_bytes = used_nodes / 8; | |
188 | if (used_bmp_bytes) { | |
189 | memset(bmp, 0xFF, used_bmp_bytes); | |
190 | bmp += used_bmp_bytes; | |
191 | used_nodes %= 8; | |
192 | } | |
193 | *bmp = ~(0xFF >> used_nodes); | |
194 | offset += hdr_node_map_rec_bits / 8; | |
195 | *--rec_offsets = cpu_to_be16(offset); | |
196 | } | |
197 | ||
95e0d7db VD |
198 | static int hfsplus_create_attributes_file(struct super_block *sb) |
199 | { | |
200 | int err = 0; | |
201 | struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); | |
202 | struct inode *attr_file; | |
203 | struct hfsplus_inode_info *hip; | |
204 | u32 clump_size; | |
205 | u16 node_size = HFSPLUS_ATTR_TREE_NODE_SIZE; | |
206 | char *buf; | |
207 | int index, written; | |
208 | struct address_space *mapping; | |
209 | struct page *page; | |
210 | int old_state = HFSPLUS_EMPTY_ATTR_TREE; | |
211 | ||
212 | hfs_dbg(ATTR_MOD, "create_attr_file: ino %d\n", HFSPLUS_ATTR_CNID); | |
213 | ||
214 | check_attr_tree_state_again: | |
215 | switch (atomic_read(&sbi->attr_tree_state)) { | |
216 | case HFSPLUS_EMPTY_ATTR_TREE: | |
217 | if (old_state != atomic_cmpxchg(&sbi->attr_tree_state, | |
218 | old_state, | |
219 | HFSPLUS_CREATING_ATTR_TREE)) | |
220 | goto check_attr_tree_state_again; | |
221 | break; | |
222 | case HFSPLUS_CREATING_ATTR_TREE: | |
223 | /* | |
224 | * This state means that another thread is in process | |
225 | * of AttributesFile creation. Theoretically, it is | |
226 | * possible to be here. But really __setxattr() method | |
227 | * first of all calls hfs_find_init() for lookup in | |
228 | * B-tree of CatalogFile. This method locks mutex of | |
229 | * CatalogFile's B-tree. As a result, if some thread | |
230 | * is inside AttributedFile creation operation then | |
231 | * another threads will be waiting unlocking of | |
232 | * CatalogFile's B-tree's mutex. However, if code will | |
233 | * change then we will return error code (-EAGAIN) from | |
234 | * here. Really, it means that first try to set of xattr | |
235 | * fails with error but second attempt will have success. | |
236 | */ | |
237 | return -EAGAIN; | |
238 | case HFSPLUS_VALID_ATTR_TREE: | |
239 | return 0; | |
240 | case HFSPLUS_FAILED_ATTR_TREE: | |
241 | return -EOPNOTSUPP; | |
242 | default: | |
243 | BUG(); | |
244 | } | |
245 | ||
246 | attr_file = hfsplus_iget(sb, HFSPLUS_ATTR_CNID); | |
247 | if (IS_ERR(attr_file)) { | |
248 | pr_err("failed to load attributes file\n"); | |
249 | return PTR_ERR(attr_file); | |
250 | } | |
251 | ||
252 | BUG_ON(i_size_read(attr_file) != 0); | |
253 | ||
254 | hip = HFSPLUS_I(attr_file); | |
255 | ||
256 | clump_size = hfsplus_calc_btree_clump_size(sb->s_blocksize, | |
257 | node_size, | |
258 | sbi->sect_count, | |
259 | HFSPLUS_ATTR_CNID); | |
260 | ||
261 | mutex_lock(&hip->extents_lock); | |
262 | hip->clump_blocks = clump_size >> sbi->alloc_blksz_shift; | |
263 | mutex_unlock(&hip->extents_lock); | |
264 | ||
265 | if (sbi->free_blocks <= (hip->clump_blocks << 1)) { | |
266 | err = -ENOSPC; | |
267 | goto end_attr_file_creation; | |
268 | } | |
269 | ||
270 | while (hip->alloc_blocks < hip->clump_blocks) { | |
271 | err = hfsplus_file_extend(attr_file); | |
272 | if (unlikely(err)) { | |
273 | pr_err("failed to extend attributes file\n"); | |
274 | goto end_attr_file_creation; | |
275 | } | |
276 | hip->phys_size = attr_file->i_size = | |
277 | (loff_t)hip->alloc_blocks << sbi->alloc_blksz_shift; | |
278 | hip->fs_blocks = hip->alloc_blocks << sbi->fs_shift; | |
279 | inode_set_bytes(attr_file, attr_file->i_size); | |
280 | } | |
281 | ||
282 | buf = kzalloc(node_size, GFP_NOFS); | |
283 | if (!buf) { | |
284 | pr_err("failed to allocate memory for header node\n"); | |
285 | err = -ENOMEM; | |
286 | goto end_attr_file_creation; | |
287 | } | |
288 | ||
289 | hfsplus_init_header_node(attr_file, clump_size, buf, node_size); | |
290 | ||
291 | mapping = attr_file->i_mapping; | |
292 | ||
293 | index = 0; | |
294 | written = 0; | |
295 | for (; written < node_size; index++, written += PAGE_CACHE_SIZE) { | |
296 | void *kaddr; | |
297 | ||
298 | page = read_mapping_page(mapping, index, NULL); | |
299 | if (IS_ERR(page)) { | |
300 | err = PTR_ERR(page); | |
301 | goto failed_header_node_init; | |
302 | } | |
303 | ||
304 | kaddr = kmap_atomic(page); | |
305 | memcpy(kaddr, buf + written, | |
306 | min_t(size_t, PAGE_CACHE_SIZE, node_size - written)); | |
307 | kunmap_atomic(kaddr); | |
308 | ||
309 | set_page_dirty(page); | |
310 | page_cache_release(page); | |
311 | } | |
312 | ||
313 | hfsplus_mark_inode_dirty(attr_file, HFSPLUS_I_ATTR_DIRTY); | |
314 | ||
315 | sbi->attr_tree = hfs_btree_open(sb, HFSPLUS_ATTR_CNID); | |
316 | if (!sbi->attr_tree) | |
317 | pr_err("failed to load attributes file\n"); | |
318 | ||
319 | failed_header_node_init: | |
320 | kfree(buf); | |
321 | ||
322 | end_attr_file_creation: | |
323 | iput(attr_file); | |
324 | ||
325 | if (!err) | |
326 | atomic_set(&sbi->attr_tree_state, HFSPLUS_VALID_ATTR_TREE); | |
327 | else if (err == -ENOSPC) | |
328 | atomic_set(&sbi->attr_tree_state, HFSPLUS_EMPTY_ATTR_TREE); | |
329 | else | |
330 | atomic_set(&sbi->attr_tree_state, HFSPLUS_FAILED_ATTR_TREE); | |
331 | ||
332 | return err; | |
333 | } | |
334 | ||
127e5f5a VD |
335 | int __hfsplus_setxattr(struct inode *inode, const char *name, |
336 | const void *value, size_t size, int flags) | |
337 | { | |
338 | int err = 0; | |
339 | struct hfs_find_data cat_fd; | |
340 | hfsplus_cat_entry entry; | |
341 | u16 cat_entry_flags, cat_entry_type; | |
342 | u16 folder_finderinfo_len = sizeof(struct DInfo) + | |
343 | sizeof(struct DXInfo); | |
344 | u16 file_finderinfo_len = sizeof(struct FInfo) + | |
345 | sizeof(struct FXInfo); | |
346 | ||
347 | if ((!S_ISREG(inode->i_mode) && | |
348 | !S_ISDIR(inode->i_mode)) || | |
349 | HFSPLUS_IS_RSRC(inode)) | |
350 | return -EOPNOTSUPP; | |
351 | ||
352 | err = can_set_xattr(inode, name, value, size); | |
353 | if (err) | |
354 | return err; | |
355 | ||
356 | if (strncmp(name, XATTR_MAC_OSX_PREFIX, | |
357 | XATTR_MAC_OSX_PREFIX_LEN) == 0) | |
358 | name += XATTR_MAC_OSX_PREFIX_LEN; | |
359 | ||
360 | if (value == NULL) { | |
361 | value = ""; | |
362 | size = 0; | |
363 | } | |
364 | ||
365 | err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &cat_fd); | |
366 | if (err) { | |
d6142673 | 367 | pr_err("can't init xattr find struct\n"); |
127e5f5a VD |
368 | return err; |
369 | } | |
370 | ||
371 | err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &cat_fd); | |
372 | if (err) { | |
d6142673 | 373 | pr_err("catalog searching failed\n"); |
127e5f5a VD |
374 | goto end_setxattr; |
375 | } | |
376 | ||
377 | if (!strcmp_xattr_finder_info(name)) { | |
378 | if (flags & XATTR_CREATE) { | |
d6142673 | 379 | pr_err("xattr exists yet\n"); |
127e5f5a VD |
380 | err = -EOPNOTSUPP; |
381 | goto end_setxattr; | |
382 | } | |
383 | hfs_bnode_read(cat_fd.bnode, &entry, cat_fd.entryoffset, | |
384 | sizeof(hfsplus_cat_entry)); | |
385 | if (be16_to_cpu(entry.type) == HFSPLUS_FOLDER) { | |
386 | if (size == folder_finderinfo_len) { | |
387 | memcpy(&entry.folder.user_info, value, | |
388 | folder_finderinfo_len); | |
389 | hfs_bnode_write(cat_fd.bnode, &entry, | |
390 | cat_fd.entryoffset, | |
391 | sizeof(struct hfsplus_cat_folder)); | |
392 | hfsplus_mark_inode_dirty(inode, | |
393 | HFSPLUS_I_CAT_DIRTY); | |
394 | } else { | |
395 | err = -ERANGE; | |
396 | goto end_setxattr; | |
397 | } | |
398 | } else if (be16_to_cpu(entry.type) == HFSPLUS_FILE) { | |
399 | if (size == file_finderinfo_len) { | |
400 | memcpy(&entry.file.user_info, value, | |
401 | file_finderinfo_len); | |
402 | hfs_bnode_write(cat_fd.bnode, &entry, | |
403 | cat_fd.entryoffset, | |
404 | sizeof(struct hfsplus_cat_file)); | |
405 | hfsplus_mark_inode_dirty(inode, | |
406 | HFSPLUS_I_CAT_DIRTY); | |
407 | } else { | |
408 | err = -ERANGE; | |
409 | goto end_setxattr; | |
410 | } | |
411 | } else { | |
412 | err = -EOPNOTSUPP; | |
413 | goto end_setxattr; | |
414 | } | |
415 | goto end_setxattr; | |
416 | } | |
417 | ||
418 | if (!HFSPLUS_SB(inode->i_sb)->attr_tree) { | |
95e0d7db VD |
419 | err = hfsplus_create_attributes_file(inode->i_sb); |
420 | if (unlikely(err)) | |
421 | goto end_setxattr; | |
127e5f5a VD |
422 | } |
423 | ||
424 | if (hfsplus_attr_exists(inode, name)) { | |
425 | if (flags & XATTR_CREATE) { | |
d6142673 | 426 | pr_err("xattr exists yet\n"); |
127e5f5a VD |
427 | err = -EOPNOTSUPP; |
428 | goto end_setxattr; | |
429 | } | |
430 | err = hfsplus_delete_attr(inode, name); | |
431 | if (err) | |
432 | goto end_setxattr; | |
433 | err = hfsplus_create_attr(inode, name, value, size); | |
434 | if (err) | |
435 | goto end_setxattr; | |
436 | } else { | |
437 | if (flags & XATTR_REPLACE) { | |
d6142673 | 438 | pr_err("cannot replace xattr\n"); |
127e5f5a VD |
439 | err = -EOPNOTSUPP; |
440 | goto end_setxattr; | |
441 | } | |
442 | err = hfsplus_create_attr(inode, name, value, size); | |
443 | if (err) | |
444 | goto end_setxattr; | |
445 | } | |
446 | ||
447 | cat_entry_type = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset); | |
448 | if (cat_entry_type == HFSPLUS_FOLDER) { | |
449 | cat_entry_flags = hfs_bnode_read_u16(cat_fd.bnode, | |
450 | cat_fd.entryoffset + | |
451 | offsetof(struct hfsplus_cat_folder, flags)); | |
452 | cat_entry_flags |= HFSPLUS_XATTR_EXISTS; | |
453 | if (!strcmp_xattr_acl(name)) | |
454 | cat_entry_flags |= HFSPLUS_ACL_EXISTS; | |
455 | hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset + | |
456 | offsetof(struct hfsplus_cat_folder, flags), | |
457 | cat_entry_flags); | |
458 | hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY); | |
459 | } else if (cat_entry_type == HFSPLUS_FILE) { | |
460 | cat_entry_flags = hfs_bnode_read_u16(cat_fd.bnode, | |
461 | cat_fd.entryoffset + | |
462 | offsetof(struct hfsplus_cat_file, flags)); | |
463 | cat_entry_flags |= HFSPLUS_XATTR_EXISTS; | |
464 | if (!strcmp_xattr_acl(name)) | |
465 | cat_entry_flags |= HFSPLUS_ACL_EXISTS; | |
466 | hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset + | |
467 | offsetof(struct hfsplus_cat_file, flags), | |
468 | cat_entry_flags); | |
469 | hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY); | |
470 | } else { | |
d6142673 | 471 | pr_err("invalid catalog entry type\n"); |
127e5f5a VD |
472 | err = -EIO; |
473 | goto end_setxattr; | |
474 | } | |
475 | ||
476 | end_setxattr: | |
477 | hfs_find_exit(&cat_fd); | |
478 | return err; | |
479 | } | |
480 | ||
481 | static inline int is_osx_xattr(const char *xattr_name) | |
482 | { | |
483 | return !is_known_namespace(xattr_name); | |
484 | } | |
485 | ||
486 | static int name_len(const char *xattr_name, int xattr_name_len) | |
487 | { | |
488 | int len = xattr_name_len + 1; | |
489 | ||
490 | if (is_osx_xattr(xattr_name)) | |
491 | len += XATTR_MAC_OSX_PREFIX_LEN; | |
492 | ||
493 | return len; | |
494 | } | |
495 | ||
496 | static int copy_name(char *buffer, const char *xattr_name, int name_len) | |
497 | { | |
498 | int len = name_len; | |
499 | int offset = 0; | |
500 | ||
501 | if (is_osx_xattr(xattr_name)) { | |
502 | strncpy(buffer, XATTR_MAC_OSX_PREFIX, XATTR_MAC_OSX_PREFIX_LEN); | |
503 | offset += XATTR_MAC_OSX_PREFIX_LEN; | |
504 | len += XATTR_MAC_OSX_PREFIX_LEN; | |
505 | } | |
506 | ||
507 | strncpy(buffer + offset, xattr_name, name_len); | |
508 | memset(buffer + offset + name_len, 0, 1); | |
509 | len += 1; | |
510 | ||
511 | return len; | |
512 | } | |
513 | ||
b4c1107c | 514 | static ssize_t hfsplus_getxattr_finder_info(struct inode *inode, |
127e5f5a VD |
515 | void *value, size_t size) |
516 | { | |
517 | ssize_t res = 0; | |
127e5f5a VD |
518 | struct hfs_find_data fd; |
519 | u16 entry_type; | |
520 | u16 folder_rec_len = sizeof(struct DInfo) + sizeof(struct DXInfo); | |
521 | u16 file_rec_len = sizeof(struct FInfo) + sizeof(struct FXInfo); | |
522 | u16 record_len = max(folder_rec_len, file_rec_len); | |
523 | u8 folder_finder_info[sizeof(struct DInfo) + sizeof(struct DXInfo)]; | |
524 | u8 file_finder_info[sizeof(struct FInfo) + sizeof(struct FXInfo)]; | |
525 | ||
526 | if (size >= record_len) { | |
527 | res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd); | |
528 | if (res) { | |
d6142673 | 529 | pr_err("can't init xattr find struct\n"); |
127e5f5a VD |
530 | return res; |
531 | } | |
532 | res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd); | |
533 | if (res) | |
534 | goto end_getxattr_finder_info; | |
535 | entry_type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset); | |
536 | ||
537 | if (entry_type == HFSPLUS_FOLDER) { | |
538 | hfs_bnode_read(fd.bnode, folder_finder_info, | |
539 | fd.entryoffset + | |
540 | offsetof(struct hfsplus_cat_folder, user_info), | |
541 | folder_rec_len); | |
542 | memcpy(value, folder_finder_info, folder_rec_len); | |
543 | res = folder_rec_len; | |
544 | } else if (entry_type == HFSPLUS_FILE) { | |
545 | hfs_bnode_read(fd.bnode, file_finder_info, | |
546 | fd.entryoffset + | |
547 | offsetof(struct hfsplus_cat_file, user_info), | |
548 | file_rec_len); | |
549 | memcpy(value, file_finder_info, file_rec_len); | |
550 | res = file_rec_len; | |
551 | } else { | |
552 | res = -EOPNOTSUPP; | |
553 | goto end_getxattr_finder_info; | |
554 | } | |
555 | } else | |
556 | res = size ? -ERANGE : record_len; | |
557 | ||
558 | end_getxattr_finder_info: | |
559 | if (size >= record_len) | |
560 | hfs_find_exit(&fd); | |
561 | return res; | |
562 | } | |
563 | ||
b4c1107c | 564 | ssize_t __hfsplus_getxattr(struct inode *inode, const char *name, |
127e5f5a VD |
565 | void *value, size_t size) |
566 | { | |
127e5f5a VD |
567 | struct hfs_find_data fd; |
568 | hfsplus_attr_entry *entry; | |
569 | __be32 xattr_record_type; | |
570 | u32 record_type; | |
571 | u16 record_length = 0; | |
572 | ssize_t res = 0; | |
573 | ||
574 | if ((!S_ISREG(inode->i_mode) && | |
575 | !S_ISDIR(inode->i_mode)) || | |
576 | HFSPLUS_IS_RSRC(inode)) | |
577 | return -EOPNOTSUPP; | |
578 | ||
579 | if (strncmp(name, XATTR_MAC_OSX_PREFIX, | |
580 | XATTR_MAC_OSX_PREFIX_LEN) == 0) { | |
581 | /* skip "osx." prefix */ | |
582 | name += XATTR_MAC_OSX_PREFIX_LEN; | |
583 | /* | |
584 | * Don't allow retrieving properly prefixed attributes | |
585 | * by prepending them with "osx." | |
586 | */ | |
587 | if (is_known_namespace(name)) | |
588 | return -EOPNOTSUPP; | |
589 | } | |
590 | ||
591 | if (!strcmp_xattr_finder_info(name)) | |
b4c1107c | 592 | return hfsplus_getxattr_finder_info(inode, value, size); |
127e5f5a VD |
593 | |
594 | if (!HFSPLUS_SB(inode->i_sb)->attr_tree) | |
595 | return -EOPNOTSUPP; | |
596 | ||
597 | entry = hfsplus_alloc_attr_entry(); | |
598 | if (!entry) { | |
d6142673 | 599 | pr_err("can't allocate xattr entry\n"); |
127e5f5a VD |
600 | return -ENOMEM; |
601 | } | |
602 | ||
603 | res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->attr_tree, &fd); | |
604 | if (res) { | |
d6142673 | 605 | pr_err("can't init xattr find struct\n"); |
127e5f5a VD |
606 | goto failed_getxattr_init; |
607 | } | |
608 | ||
609 | res = hfsplus_find_attr(inode->i_sb, inode->i_ino, name, &fd); | |
610 | if (res) { | |
611 | if (res == -ENOENT) | |
612 | res = -ENODATA; | |
613 | else | |
d6142673 | 614 | pr_err("xattr searching failed\n"); |
127e5f5a VD |
615 | goto out; |
616 | } | |
617 | ||
618 | hfs_bnode_read(fd.bnode, &xattr_record_type, | |
619 | fd.entryoffset, sizeof(xattr_record_type)); | |
620 | record_type = be32_to_cpu(xattr_record_type); | |
621 | if (record_type == HFSPLUS_ATTR_INLINE_DATA) { | |
622 | record_length = hfs_bnode_read_u16(fd.bnode, | |
623 | fd.entryoffset + | |
624 | offsetof(struct hfsplus_attr_inline_data, | |
625 | length)); | |
626 | if (record_length > HFSPLUS_MAX_INLINE_DATA_SIZE) { | |
d6142673 | 627 | pr_err("invalid xattr record size\n"); |
127e5f5a VD |
628 | res = -EIO; |
629 | goto out; | |
630 | } | |
631 | } else if (record_type == HFSPLUS_ATTR_FORK_DATA || | |
632 | record_type == HFSPLUS_ATTR_EXTENTS) { | |
d6142673 | 633 | pr_err("only inline data xattr are supported\n"); |
127e5f5a VD |
634 | res = -EOPNOTSUPP; |
635 | goto out; | |
636 | } else { | |
d6142673 | 637 | pr_err("invalid xattr record\n"); |
127e5f5a VD |
638 | res = -EIO; |
639 | goto out; | |
640 | } | |
641 | ||
642 | if (size) { | |
643 | hfs_bnode_read(fd.bnode, entry, fd.entryoffset, | |
644 | offsetof(struct hfsplus_attr_inline_data, | |
645 | raw_bytes) + record_length); | |
646 | } | |
647 | ||
648 | if (size >= record_length) { | |
649 | memcpy(value, entry->inline_data.raw_bytes, record_length); | |
650 | res = record_length; | |
651 | } else | |
652 | res = size ? -ERANGE : record_length; | |
653 | ||
654 | out: | |
655 | hfs_find_exit(&fd); | |
656 | ||
657 | failed_getxattr_init: | |
658 | hfsplus_destroy_attr_entry(entry); | |
659 | return res; | |
660 | } | |
661 | ||
662 | static inline int can_list(const char *xattr_name) | |
663 | { | |
664 | if (!xattr_name) | |
665 | return 0; | |
666 | ||
667 | return strncmp(xattr_name, XATTR_TRUSTED_PREFIX, | |
668 | XATTR_TRUSTED_PREFIX_LEN) || | |
669 | capable(CAP_SYS_ADMIN); | |
670 | } | |
671 | ||
672 | static ssize_t hfsplus_listxattr_finder_info(struct dentry *dentry, | |
673 | char *buffer, size_t size) | |
674 | { | |
675 | ssize_t res = 0; | |
676 | struct inode *inode = dentry->d_inode; | |
677 | struct hfs_find_data fd; | |
678 | u16 entry_type; | |
679 | u8 folder_finder_info[sizeof(struct DInfo) + sizeof(struct DXInfo)]; | |
680 | u8 file_finder_info[sizeof(struct FInfo) + sizeof(struct FXInfo)]; | |
681 | unsigned long len, found_bit; | |
682 | int xattr_name_len, symbols_count; | |
683 | ||
684 | res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd); | |
685 | if (res) { | |
d6142673 | 686 | pr_err("can't init xattr find struct\n"); |
127e5f5a VD |
687 | return res; |
688 | } | |
689 | ||
690 | res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd); | |
691 | if (res) | |
692 | goto end_listxattr_finder_info; | |
693 | ||
694 | entry_type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset); | |
695 | if (entry_type == HFSPLUS_FOLDER) { | |
696 | len = sizeof(struct DInfo) + sizeof(struct DXInfo); | |
697 | hfs_bnode_read(fd.bnode, folder_finder_info, | |
698 | fd.entryoffset + | |
699 | offsetof(struct hfsplus_cat_folder, user_info), | |
700 | len); | |
701 | found_bit = find_first_bit((void *)folder_finder_info, len*8); | |
702 | } else if (entry_type == HFSPLUS_FILE) { | |
703 | len = sizeof(struct FInfo) + sizeof(struct FXInfo); | |
704 | hfs_bnode_read(fd.bnode, file_finder_info, | |
705 | fd.entryoffset + | |
706 | offsetof(struct hfsplus_cat_file, user_info), | |
707 | len); | |
708 | found_bit = find_first_bit((void *)file_finder_info, len*8); | |
709 | } else { | |
710 | res = -EOPNOTSUPP; | |
711 | goto end_listxattr_finder_info; | |
712 | } | |
713 | ||
714 | if (found_bit >= (len*8)) | |
715 | res = 0; | |
716 | else { | |
717 | symbols_count = sizeof(HFSPLUS_XATTR_FINDER_INFO_NAME) - 1; | |
718 | xattr_name_len = | |
719 | name_len(HFSPLUS_XATTR_FINDER_INFO_NAME, symbols_count); | |
720 | if (!buffer || !size) { | |
721 | if (can_list(HFSPLUS_XATTR_FINDER_INFO_NAME)) | |
722 | res = xattr_name_len; | |
723 | } else if (can_list(HFSPLUS_XATTR_FINDER_INFO_NAME)) { | |
724 | if (size < xattr_name_len) | |
725 | res = -ERANGE; | |
726 | else { | |
727 | res = copy_name(buffer, | |
728 | HFSPLUS_XATTR_FINDER_INFO_NAME, | |
729 | symbols_count); | |
730 | } | |
731 | } | |
732 | } | |
733 | ||
734 | end_listxattr_finder_info: | |
735 | hfs_find_exit(&fd); | |
736 | ||
737 | return res; | |
738 | } | |
739 | ||
740 | ssize_t hfsplus_listxattr(struct dentry *dentry, char *buffer, size_t size) | |
741 | { | |
742 | ssize_t err; | |
743 | ssize_t res = 0; | |
744 | struct inode *inode = dentry->d_inode; | |
745 | struct hfs_find_data fd; | |
746 | u16 key_len = 0; | |
747 | struct hfsplus_attr_key attr_key; | |
748 | char strbuf[HFSPLUS_ATTR_MAX_STRLEN + | |
749 | XATTR_MAC_OSX_PREFIX_LEN + 1] = {0}; | |
750 | int xattr_name_len; | |
751 | ||
752 | if ((!S_ISREG(inode->i_mode) && | |
753 | !S_ISDIR(inode->i_mode)) || | |
754 | HFSPLUS_IS_RSRC(inode)) | |
755 | return -EOPNOTSUPP; | |
756 | ||
757 | res = hfsplus_listxattr_finder_info(dentry, buffer, size); | |
758 | if (res < 0) | |
759 | return res; | |
760 | else if (!HFSPLUS_SB(inode->i_sb)->attr_tree) | |
761 | return (res == 0) ? -EOPNOTSUPP : res; | |
762 | ||
763 | err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->attr_tree, &fd); | |
764 | if (err) { | |
d6142673 | 765 | pr_err("can't init xattr find struct\n"); |
127e5f5a VD |
766 | return err; |
767 | } | |
768 | ||
769 | err = hfsplus_find_attr(inode->i_sb, inode->i_ino, NULL, &fd); | |
770 | if (err) { | |
771 | if (err == -ENOENT) { | |
772 | if (res == 0) | |
773 | res = -ENODATA; | |
774 | goto end_listxattr; | |
775 | } else { | |
776 | res = err; | |
777 | goto end_listxattr; | |
778 | } | |
779 | } | |
780 | ||
781 | for (;;) { | |
782 | key_len = hfs_bnode_read_u16(fd.bnode, fd.keyoffset); | |
783 | if (key_len == 0 || key_len > fd.tree->max_key_len) { | |
d6142673 | 784 | pr_err("invalid xattr key length: %d\n", key_len); |
127e5f5a VD |
785 | res = -EIO; |
786 | goto end_listxattr; | |
787 | } | |
788 | ||
789 | hfs_bnode_read(fd.bnode, &attr_key, | |
790 | fd.keyoffset, key_len + sizeof(key_len)); | |
791 | ||
792 | if (be32_to_cpu(attr_key.cnid) != inode->i_ino) | |
793 | goto end_listxattr; | |
794 | ||
795 | xattr_name_len = HFSPLUS_ATTR_MAX_STRLEN; | |
796 | if (hfsplus_uni2asc(inode->i_sb, | |
797 | (const struct hfsplus_unistr *)&fd.key->attr.key_name, | |
798 | strbuf, &xattr_name_len)) { | |
d6142673 | 799 | pr_err("unicode conversion failed\n"); |
127e5f5a VD |
800 | res = -EIO; |
801 | goto end_listxattr; | |
802 | } | |
803 | ||
804 | if (!buffer || !size) { | |
805 | if (can_list(strbuf)) | |
806 | res += name_len(strbuf, xattr_name_len); | |
807 | } else if (can_list(strbuf)) { | |
808 | if (size < (res + name_len(strbuf, xattr_name_len))) { | |
809 | res = -ERANGE; | |
810 | goto end_listxattr; | |
811 | } else | |
812 | res += copy_name(buffer + res, | |
813 | strbuf, xattr_name_len); | |
814 | } | |
815 | ||
816 | if (hfs_brec_goto(&fd, 1)) | |
817 | goto end_listxattr; | |
818 | } | |
819 | ||
820 | end_listxattr: | |
821 | hfs_find_exit(&fd); | |
822 | return res; | |
823 | } | |
824 | ||
825 | int hfsplus_removexattr(struct dentry *dentry, const char *name) | |
826 | { | |
827 | int err = 0; | |
828 | struct inode *inode = dentry->d_inode; | |
829 | struct hfs_find_data cat_fd; | |
830 | u16 flags; | |
831 | u16 cat_entry_type; | |
832 | int is_xattr_acl_deleted = 0; | |
833 | int is_all_xattrs_deleted = 0; | |
834 | ||
835 | if ((!S_ISREG(inode->i_mode) && | |
836 | !S_ISDIR(inode->i_mode)) || | |
837 | HFSPLUS_IS_RSRC(inode)) | |
838 | return -EOPNOTSUPP; | |
839 | ||
840 | if (!HFSPLUS_SB(inode->i_sb)->attr_tree) | |
841 | return -EOPNOTSUPP; | |
842 | ||
843 | err = can_set_xattr(inode, name, NULL, 0); | |
844 | if (err) | |
845 | return err; | |
846 | ||
847 | if (strncmp(name, XATTR_MAC_OSX_PREFIX, | |
848 | XATTR_MAC_OSX_PREFIX_LEN) == 0) | |
849 | name += XATTR_MAC_OSX_PREFIX_LEN; | |
850 | ||
851 | if (!strcmp_xattr_finder_info(name)) | |
852 | return -EOPNOTSUPP; | |
853 | ||
854 | err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &cat_fd); | |
855 | if (err) { | |
d6142673 | 856 | pr_err("can't init xattr find struct\n"); |
127e5f5a VD |
857 | return err; |
858 | } | |
859 | ||
860 | err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &cat_fd); | |
861 | if (err) { | |
d6142673 | 862 | pr_err("catalog searching failed\n"); |
127e5f5a VD |
863 | goto end_removexattr; |
864 | } | |
865 | ||
866 | err = hfsplus_delete_attr(inode, name); | |
867 | if (err) | |
868 | goto end_removexattr; | |
869 | ||
870 | is_xattr_acl_deleted = !strcmp_xattr_acl(name); | |
871 | is_all_xattrs_deleted = !hfsplus_attr_exists(inode, NULL); | |
872 | ||
873 | if (!is_xattr_acl_deleted && !is_all_xattrs_deleted) | |
874 | goto end_removexattr; | |
875 | ||
876 | cat_entry_type = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset); | |
877 | ||
878 | if (cat_entry_type == HFSPLUS_FOLDER) { | |
879 | flags = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset + | |
880 | offsetof(struct hfsplus_cat_folder, flags)); | |
881 | if (is_xattr_acl_deleted) | |
882 | flags &= ~HFSPLUS_ACL_EXISTS; | |
883 | if (is_all_xattrs_deleted) | |
884 | flags &= ~HFSPLUS_XATTR_EXISTS; | |
885 | hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset + | |
886 | offsetof(struct hfsplus_cat_folder, flags), | |
887 | flags); | |
888 | hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY); | |
889 | } else if (cat_entry_type == HFSPLUS_FILE) { | |
890 | flags = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset + | |
891 | offsetof(struct hfsplus_cat_file, flags)); | |
892 | if (is_xattr_acl_deleted) | |
893 | flags &= ~HFSPLUS_ACL_EXISTS; | |
894 | if (is_all_xattrs_deleted) | |
895 | flags &= ~HFSPLUS_XATTR_EXISTS; | |
896 | hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset + | |
897 | offsetof(struct hfsplus_cat_file, flags), | |
898 | flags); | |
899 | hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY); | |
900 | } else { | |
d6142673 | 901 | pr_err("invalid catalog entry type\n"); |
127e5f5a VD |
902 | err = -EIO; |
903 | goto end_removexattr; | |
904 | } | |
905 | ||
906 | end_removexattr: | |
907 | hfs_find_exit(&cat_fd); | |
908 | return err; | |
909 | } | |
910 | ||
911 | static int hfsplus_osx_getxattr(struct dentry *dentry, const char *name, | |
912 | void *buffer, size_t size, int type) | |
913 | { | |
914 | char xattr_name[HFSPLUS_ATTR_MAX_STRLEN + | |
915 | XATTR_MAC_OSX_PREFIX_LEN + 1] = {0}; | |
916 | size_t len = strlen(name); | |
917 | ||
918 | if (!strcmp(name, "")) | |
919 | return -EINVAL; | |
920 | ||
921 | if (len > HFSPLUS_ATTR_MAX_STRLEN) | |
922 | return -EOPNOTSUPP; | |
923 | ||
924 | strcpy(xattr_name, XATTR_MAC_OSX_PREFIX); | |
925 | strcpy(xattr_name + XATTR_MAC_OSX_PREFIX_LEN, name); | |
926 | ||
927 | return hfsplus_getxattr(dentry, xattr_name, buffer, size); | |
928 | } | |
929 | ||
930 | static int hfsplus_osx_setxattr(struct dentry *dentry, const char *name, | |
931 | const void *buffer, size_t size, int flags, int type) | |
932 | { | |
933 | char xattr_name[HFSPLUS_ATTR_MAX_STRLEN + | |
934 | XATTR_MAC_OSX_PREFIX_LEN + 1] = {0}; | |
935 | size_t len = strlen(name); | |
936 | ||
937 | if (!strcmp(name, "")) | |
938 | return -EINVAL; | |
939 | ||
940 | if (len > HFSPLUS_ATTR_MAX_STRLEN) | |
941 | return -EOPNOTSUPP; | |
942 | ||
943 | strcpy(xattr_name, XATTR_MAC_OSX_PREFIX); | |
944 | strcpy(xattr_name + XATTR_MAC_OSX_PREFIX_LEN, name); | |
945 | ||
946 | return hfsplus_setxattr(dentry, xattr_name, buffer, size, flags); | |
947 | } | |
948 | ||
949 | static size_t hfsplus_osx_listxattr(struct dentry *dentry, char *list, | |
950 | size_t list_size, const char *name, size_t name_len, int type) | |
951 | { | |
952 | /* | |
953 | * This method is not used. | |
954 | * It is used hfsplus_listxattr() instead of generic_listxattr(). | |
955 | */ | |
956 | return -EOPNOTSUPP; | |
957 | } | |
958 | ||
959 | const struct xattr_handler hfsplus_xattr_osx_handler = { | |
960 | .prefix = XATTR_MAC_OSX_PREFIX, | |
961 | .list = hfsplus_osx_listxattr, | |
962 | .get = hfsplus_osx_getxattr, | |
963 | .set = hfsplus_osx_setxattr, | |
964 | }; |