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" | |
b0a7ab57 | 10 | #include <linux/posix_acl_xattr.h> |
017f8da4 | 11 | #include <linux/nls.h> |
127e5f5a | 12 | #include "xattr.h" |
b4c1107c | 13 | #include "acl.h" |
127e5f5a | 14 | |
b168fff7 CH |
15 | static int hfsplus_removexattr(struct inode *inode, const char *name); |
16 | ||
127e5f5a VD |
17 | const struct xattr_handler *hfsplus_xattr_handlers[] = { |
18 | &hfsplus_xattr_osx_handler, | |
19 | &hfsplus_xattr_user_handler, | |
20 | &hfsplus_xattr_trusted_handler, | |
b4c1107c | 21 | #ifdef CONFIG_HFSPLUS_FS_POSIX_ACL |
b0a7ab57 CH |
22 | &posix_acl_access_xattr_handler, |
23 | &posix_acl_default_xattr_handler, | |
b4c1107c | 24 | #endif |
127e5f5a VD |
25 | &hfsplus_xattr_security_handler, |
26 | NULL | |
27 | }; | |
28 | ||
29 | static int strcmp_xattr_finder_info(const char *name) | |
30 | { | |
31 | if (name) { | |
32 | return strncmp(name, HFSPLUS_XATTR_FINDER_INFO_NAME, | |
33 | sizeof(HFSPLUS_XATTR_FINDER_INFO_NAME)); | |
34 | } | |
35 | return -1; | |
36 | } | |
37 | ||
38 | static int strcmp_xattr_acl(const char *name) | |
39 | { | |
40 | if (name) { | |
41 | return strncmp(name, HFSPLUS_XATTR_ACL_NAME, | |
42 | sizeof(HFSPLUS_XATTR_ACL_NAME)); | |
43 | } | |
44 | return -1; | |
45 | } | |
46 | ||
1ad8d63d | 47 | static bool is_known_namespace(const char *name) |
127e5f5a VD |
48 | { |
49 | if (strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN) && | |
50 | strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN) && | |
51 | strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) && | |
52 | strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN)) | |
53 | return false; | |
54 | ||
55 | return true; | |
56 | } | |
57 | ||
099e9245 VD |
58 | static void hfsplus_init_header_node(struct inode *attr_file, |
59 | u32 clump_size, | |
a99b7069 | 60 | char *buf, u16 node_size) |
099e9245 VD |
61 | { |
62 | struct hfs_bnode_desc *desc; | |
63 | struct hfs_btree_header_rec *head; | |
64 | u16 offset; | |
65 | __be16 *rec_offsets; | |
66 | u32 hdr_node_map_rec_bits; | |
67 | char *bmp; | |
68 | u32 used_nodes; | |
69 | u32 used_bmp_bytes; | |
df3d4e7a | 70 | u64 tmp; |
099e9245 | 71 | |
a99b7069 | 72 | hfs_dbg(ATTR_MOD, "init_hdr_attr_file: clump %u, node_size %u\n", |
b73f3d0e | 73 | clump_size, node_size); |
099e9245 VD |
74 | |
75 | /* The end of the node contains list of record offsets */ | |
76 | rec_offsets = (__be16 *)(buf + node_size); | |
77 | ||
78 | desc = (struct hfs_bnode_desc *)buf; | |
79 | desc->type = HFS_NODE_HEADER; | |
80 | desc->num_recs = cpu_to_be16(HFSPLUS_BTREE_HDR_NODE_RECS_COUNT); | |
81 | offset = sizeof(struct hfs_bnode_desc); | |
82 | *--rec_offsets = cpu_to_be16(offset); | |
83 | ||
84 | head = (struct hfs_btree_header_rec *)(buf + offset); | |
85 | head->node_size = cpu_to_be16(node_size); | |
a99b7069 GU |
86 | tmp = i_size_read(attr_file); |
87 | do_div(tmp, node_size); | |
88 | head->node_count = cpu_to_be32(tmp); | |
099e9245 VD |
89 | head->free_nodes = cpu_to_be32(be32_to_cpu(head->node_count) - 1); |
90 | head->clump_size = cpu_to_be32(clump_size); | |
91 | head->attributes |= cpu_to_be32(HFS_TREE_BIGKEYS | HFS_TREE_VARIDXKEYS); | |
92 | head->max_key_len = cpu_to_be16(HFSPLUS_ATTR_KEYLEN - sizeof(u16)); | |
93 | offset += sizeof(struct hfs_btree_header_rec); | |
94 | *--rec_offsets = cpu_to_be16(offset); | |
95 | offset += HFSPLUS_BTREE_HDR_USER_BYTES; | |
96 | *--rec_offsets = cpu_to_be16(offset); | |
97 | ||
98 | hdr_node_map_rec_bits = 8 * (node_size - offset - (4 * sizeof(u16))); | |
99 | if (be32_to_cpu(head->node_count) > hdr_node_map_rec_bits) { | |
100 | u32 map_node_bits; | |
101 | u32 map_nodes; | |
102 | ||
103 | desc->next = cpu_to_be32(be32_to_cpu(head->leaf_tail) + 1); | |
104 | map_node_bits = 8 * (node_size - sizeof(struct hfs_bnode_desc) - | |
105 | (2 * sizeof(u16)) - 2); | |
106 | map_nodes = (be32_to_cpu(head->node_count) - | |
107 | hdr_node_map_rec_bits + | |
108 | (map_node_bits - 1)) / map_node_bits; | |
109 | be32_add_cpu(&head->free_nodes, 0 - map_nodes); | |
110 | } | |
111 | ||
112 | bmp = buf + offset; | |
113 | used_nodes = | |
114 | be32_to_cpu(head->node_count) - be32_to_cpu(head->free_nodes); | |
115 | used_bmp_bytes = used_nodes / 8; | |
116 | if (used_bmp_bytes) { | |
117 | memset(bmp, 0xFF, used_bmp_bytes); | |
118 | bmp += used_bmp_bytes; | |
119 | used_nodes %= 8; | |
120 | } | |
121 | *bmp = ~(0xFF >> used_nodes); | |
122 | offset += hdr_node_map_rec_bits / 8; | |
123 | *--rec_offsets = cpu_to_be16(offset); | |
124 | } | |
125 | ||
95e0d7db VD |
126 | static int hfsplus_create_attributes_file(struct super_block *sb) |
127 | { | |
128 | int err = 0; | |
129 | struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); | |
130 | struct inode *attr_file; | |
131 | struct hfsplus_inode_info *hip; | |
132 | u32 clump_size; | |
133 | u16 node_size = HFSPLUS_ATTR_TREE_NODE_SIZE; | |
134 | char *buf; | |
135 | int index, written; | |
136 | struct address_space *mapping; | |
137 | struct page *page; | |
138 | int old_state = HFSPLUS_EMPTY_ATTR_TREE; | |
139 | ||
140 | hfs_dbg(ATTR_MOD, "create_attr_file: ino %d\n", HFSPLUS_ATTR_CNID); | |
141 | ||
142 | check_attr_tree_state_again: | |
143 | switch (atomic_read(&sbi->attr_tree_state)) { | |
144 | case HFSPLUS_EMPTY_ATTR_TREE: | |
145 | if (old_state != atomic_cmpxchg(&sbi->attr_tree_state, | |
146 | old_state, | |
147 | HFSPLUS_CREATING_ATTR_TREE)) | |
148 | goto check_attr_tree_state_again; | |
149 | break; | |
150 | case HFSPLUS_CREATING_ATTR_TREE: | |
151 | /* | |
152 | * This state means that another thread is in process | |
153 | * of AttributesFile creation. Theoretically, it is | |
154 | * possible to be here. But really __setxattr() method | |
155 | * first of all calls hfs_find_init() for lookup in | |
156 | * B-tree of CatalogFile. This method locks mutex of | |
157 | * CatalogFile's B-tree. As a result, if some thread | |
158 | * is inside AttributedFile creation operation then | |
159 | * another threads will be waiting unlocking of | |
160 | * CatalogFile's B-tree's mutex. However, if code will | |
161 | * change then we will return error code (-EAGAIN) from | |
162 | * here. Really, it means that first try to set of xattr | |
163 | * fails with error but second attempt will have success. | |
164 | */ | |
165 | return -EAGAIN; | |
166 | case HFSPLUS_VALID_ATTR_TREE: | |
167 | return 0; | |
168 | case HFSPLUS_FAILED_ATTR_TREE: | |
169 | return -EOPNOTSUPP; | |
170 | default: | |
171 | BUG(); | |
172 | } | |
173 | ||
174 | attr_file = hfsplus_iget(sb, HFSPLUS_ATTR_CNID); | |
175 | if (IS_ERR(attr_file)) { | |
176 | pr_err("failed to load attributes file\n"); | |
177 | return PTR_ERR(attr_file); | |
178 | } | |
179 | ||
180 | BUG_ON(i_size_read(attr_file) != 0); | |
181 | ||
182 | hip = HFSPLUS_I(attr_file); | |
183 | ||
184 | clump_size = hfsplus_calc_btree_clump_size(sb->s_blocksize, | |
185 | node_size, | |
186 | sbi->sect_count, | |
187 | HFSPLUS_ATTR_CNID); | |
188 | ||
189 | mutex_lock(&hip->extents_lock); | |
190 | hip->clump_blocks = clump_size >> sbi->alloc_blksz_shift; | |
191 | mutex_unlock(&hip->extents_lock); | |
192 | ||
193 | if (sbi->free_blocks <= (hip->clump_blocks << 1)) { | |
194 | err = -ENOSPC; | |
195 | goto end_attr_file_creation; | |
196 | } | |
197 | ||
198 | while (hip->alloc_blocks < hip->clump_blocks) { | |
2cd282a1 | 199 | err = hfsplus_file_extend(attr_file, false); |
95e0d7db VD |
200 | if (unlikely(err)) { |
201 | pr_err("failed to extend attributes file\n"); | |
202 | goto end_attr_file_creation; | |
203 | } | |
204 | hip->phys_size = attr_file->i_size = | |
205 | (loff_t)hip->alloc_blocks << sbi->alloc_blksz_shift; | |
206 | hip->fs_blocks = hip->alloc_blocks << sbi->fs_shift; | |
207 | inode_set_bytes(attr_file, attr_file->i_size); | |
208 | } | |
209 | ||
210 | buf = kzalloc(node_size, GFP_NOFS); | |
211 | if (!buf) { | |
212 | pr_err("failed to allocate memory for header node\n"); | |
213 | err = -ENOMEM; | |
214 | goto end_attr_file_creation; | |
215 | } | |
216 | ||
217 | hfsplus_init_header_node(attr_file, clump_size, buf, node_size); | |
218 | ||
219 | mapping = attr_file->i_mapping; | |
220 | ||
221 | index = 0; | |
222 | written = 0; | |
223 | for (; written < node_size; index++, written += PAGE_CACHE_SIZE) { | |
224 | void *kaddr; | |
225 | ||
226 | page = read_mapping_page(mapping, index, NULL); | |
227 | if (IS_ERR(page)) { | |
228 | err = PTR_ERR(page); | |
229 | goto failed_header_node_init; | |
230 | } | |
231 | ||
232 | kaddr = kmap_atomic(page); | |
233 | memcpy(kaddr, buf + written, | |
234 | min_t(size_t, PAGE_CACHE_SIZE, node_size - written)); | |
235 | kunmap_atomic(kaddr); | |
236 | ||
237 | set_page_dirty(page); | |
238 | page_cache_release(page); | |
239 | } | |
240 | ||
241 | hfsplus_mark_inode_dirty(attr_file, HFSPLUS_I_ATTR_DIRTY); | |
242 | ||
243 | sbi->attr_tree = hfs_btree_open(sb, HFSPLUS_ATTR_CNID); | |
244 | if (!sbi->attr_tree) | |
245 | pr_err("failed to load attributes file\n"); | |
246 | ||
247 | failed_header_node_init: | |
248 | kfree(buf); | |
249 | ||
250 | end_attr_file_creation: | |
251 | iput(attr_file); | |
252 | ||
253 | if (!err) | |
254 | atomic_set(&sbi->attr_tree_state, HFSPLUS_VALID_ATTR_TREE); | |
255 | else if (err == -ENOSPC) | |
256 | atomic_set(&sbi->attr_tree_state, HFSPLUS_EMPTY_ATTR_TREE); | |
257 | else | |
258 | atomic_set(&sbi->attr_tree_state, HFSPLUS_FAILED_ATTR_TREE); | |
259 | ||
260 | return err; | |
261 | } | |
262 | ||
127e5f5a VD |
263 | int __hfsplus_setxattr(struct inode *inode, const char *name, |
264 | const void *value, size_t size, int flags) | |
265 | { | |
266 | int err = 0; | |
267 | struct hfs_find_data cat_fd; | |
268 | hfsplus_cat_entry entry; | |
269 | u16 cat_entry_flags, cat_entry_type; | |
270 | u16 folder_finderinfo_len = sizeof(struct DInfo) + | |
271 | sizeof(struct DXInfo); | |
272 | u16 file_finderinfo_len = sizeof(struct FInfo) + | |
273 | sizeof(struct FXInfo); | |
274 | ||
275 | if ((!S_ISREG(inode->i_mode) && | |
276 | !S_ISDIR(inode->i_mode)) || | |
277 | HFSPLUS_IS_RSRC(inode)) | |
278 | return -EOPNOTSUPP; | |
279 | ||
b168fff7 CH |
280 | if (value == NULL) |
281 | return hfsplus_removexattr(inode, name); | |
127e5f5a VD |
282 | |
283 | err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &cat_fd); | |
284 | if (err) { | |
d6142673 | 285 | pr_err("can't init xattr find struct\n"); |
127e5f5a VD |
286 | return err; |
287 | } | |
288 | ||
289 | err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &cat_fd); | |
290 | if (err) { | |
d6142673 | 291 | pr_err("catalog searching failed\n"); |
127e5f5a VD |
292 | goto end_setxattr; |
293 | } | |
294 | ||
295 | if (!strcmp_xattr_finder_info(name)) { | |
296 | if (flags & XATTR_CREATE) { | |
d6142673 | 297 | pr_err("xattr exists yet\n"); |
127e5f5a VD |
298 | err = -EOPNOTSUPP; |
299 | goto end_setxattr; | |
300 | } | |
301 | hfs_bnode_read(cat_fd.bnode, &entry, cat_fd.entryoffset, | |
302 | sizeof(hfsplus_cat_entry)); | |
303 | if (be16_to_cpu(entry.type) == HFSPLUS_FOLDER) { | |
304 | if (size == folder_finderinfo_len) { | |
305 | memcpy(&entry.folder.user_info, value, | |
306 | folder_finderinfo_len); | |
307 | hfs_bnode_write(cat_fd.bnode, &entry, | |
308 | cat_fd.entryoffset, | |
309 | sizeof(struct hfsplus_cat_folder)); | |
310 | hfsplus_mark_inode_dirty(inode, | |
311 | HFSPLUS_I_CAT_DIRTY); | |
312 | } else { | |
313 | err = -ERANGE; | |
314 | goto end_setxattr; | |
315 | } | |
316 | } else if (be16_to_cpu(entry.type) == HFSPLUS_FILE) { | |
317 | if (size == file_finderinfo_len) { | |
318 | memcpy(&entry.file.user_info, value, | |
319 | file_finderinfo_len); | |
320 | hfs_bnode_write(cat_fd.bnode, &entry, | |
321 | cat_fd.entryoffset, | |
322 | sizeof(struct hfsplus_cat_file)); | |
323 | hfsplus_mark_inode_dirty(inode, | |
324 | HFSPLUS_I_CAT_DIRTY); | |
325 | } else { | |
326 | err = -ERANGE; | |
327 | goto end_setxattr; | |
328 | } | |
329 | } else { | |
330 | err = -EOPNOTSUPP; | |
331 | goto end_setxattr; | |
332 | } | |
333 | goto end_setxattr; | |
334 | } | |
335 | ||
336 | if (!HFSPLUS_SB(inode->i_sb)->attr_tree) { | |
95e0d7db VD |
337 | err = hfsplus_create_attributes_file(inode->i_sb); |
338 | if (unlikely(err)) | |
339 | goto end_setxattr; | |
127e5f5a VD |
340 | } |
341 | ||
342 | if (hfsplus_attr_exists(inode, name)) { | |
343 | if (flags & XATTR_CREATE) { | |
d6142673 | 344 | pr_err("xattr exists yet\n"); |
127e5f5a VD |
345 | err = -EOPNOTSUPP; |
346 | goto end_setxattr; | |
347 | } | |
348 | err = hfsplus_delete_attr(inode, name); | |
349 | if (err) | |
350 | goto end_setxattr; | |
351 | err = hfsplus_create_attr(inode, name, value, size); | |
352 | if (err) | |
353 | goto end_setxattr; | |
354 | } else { | |
355 | if (flags & XATTR_REPLACE) { | |
d6142673 | 356 | pr_err("cannot replace xattr\n"); |
127e5f5a VD |
357 | err = -EOPNOTSUPP; |
358 | goto end_setxattr; | |
359 | } | |
360 | err = hfsplus_create_attr(inode, name, value, size); | |
361 | if (err) | |
362 | goto end_setxattr; | |
363 | } | |
364 | ||
365 | cat_entry_type = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset); | |
366 | if (cat_entry_type == HFSPLUS_FOLDER) { | |
367 | cat_entry_flags = hfs_bnode_read_u16(cat_fd.bnode, | |
368 | cat_fd.entryoffset + | |
369 | offsetof(struct hfsplus_cat_folder, flags)); | |
370 | cat_entry_flags |= HFSPLUS_XATTR_EXISTS; | |
371 | if (!strcmp_xattr_acl(name)) | |
372 | cat_entry_flags |= HFSPLUS_ACL_EXISTS; | |
373 | hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset + | |
374 | offsetof(struct hfsplus_cat_folder, flags), | |
375 | cat_entry_flags); | |
376 | hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY); | |
377 | } else if (cat_entry_type == HFSPLUS_FILE) { | |
378 | cat_entry_flags = hfs_bnode_read_u16(cat_fd.bnode, | |
379 | cat_fd.entryoffset + | |
380 | offsetof(struct hfsplus_cat_file, flags)); | |
381 | cat_entry_flags |= HFSPLUS_XATTR_EXISTS; | |
382 | if (!strcmp_xattr_acl(name)) | |
383 | cat_entry_flags |= HFSPLUS_ACL_EXISTS; | |
384 | hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset + | |
385 | offsetof(struct hfsplus_cat_file, flags), | |
386 | cat_entry_flags); | |
387 | hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY); | |
388 | } else { | |
d6142673 | 389 | pr_err("invalid catalog entry type\n"); |
127e5f5a VD |
390 | err = -EIO; |
391 | goto end_setxattr; | |
392 | } | |
393 | ||
394 | end_setxattr: | |
395 | hfs_find_exit(&cat_fd); | |
396 | return err; | |
397 | } | |
398 | ||
127e5f5a VD |
399 | static int name_len(const char *xattr_name, int xattr_name_len) |
400 | { | |
401 | int len = xattr_name_len + 1; | |
402 | ||
b168fff7 | 403 | if (!is_known_namespace(xattr_name)) |
127e5f5a VD |
404 | len += XATTR_MAC_OSX_PREFIX_LEN; |
405 | ||
406 | return len; | |
407 | } | |
408 | ||
409 | static int copy_name(char *buffer, const char *xattr_name, int name_len) | |
410 | { | |
411 | int len = name_len; | |
412 | int offset = 0; | |
413 | ||
b168fff7 | 414 | if (!is_known_namespace(xattr_name)) { |
127e5f5a VD |
415 | strncpy(buffer, XATTR_MAC_OSX_PREFIX, XATTR_MAC_OSX_PREFIX_LEN); |
416 | offset += XATTR_MAC_OSX_PREFIX_LEN; | |
417 | len += XATTR_MAC_OSX_PREFIX_LEN; | |
418 | } | |
419 | ||
420 | strncpy(buffer + offset, xattr_name, name_len); | |
421 | memset(buffer + offset + name_len, 0, 1); | |
422 | len += 1; | |
423 | ||
424 | return len; | |
425 | } | |
426 | ||
5e61473e FF |
427 | int hfsplus_setxattr(struct dentry *dentry, const char *name, |
428 | const void *value, size_t size, int flags, | |
429 | const char *prefix, size_t prefixlen) | |
430 | { | |
431 | char *xattr_name; | |
432 | int res; | |
433 | ||
434 | if (!strcmp(name, "")) | |
435 | return -EINVAL; | |
436 | ||
437 | xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1, | |
438 | GFP_KERNEL); | |
439 | if (!xattr_name) | |
440 | return -ENOMEM; | |
441 | strcpy(xattr_name, prefix); | |
442 | strcpy(xattr_name + prefixlen, name); | |
9ec3a646 | 443 | res = __hfsplus_setxattr(d_inode(dentry), xattr_name, value, size, |
5e61473e FF |
444 | flags); |
445 | kfree(xattr_name); | |
446 | return res; | |
447 | } | |
448 | ||
b4c1107c | 449 | static ssize_t hfsplus_getxattr_finder_info(struct inode *inode, |
127e5f5a VD |
450 | void *value, size_t size) |
451 | { | |
452 | ssize_t res = 0; | |
127e5f5a VD |
453 | struct hfs_find_data fd; |
454 | u16 entry_type; | |
455 | u16 folder_rec_len = sizeof(struct DInfo) + sizeof(struct DXInfo); | |
456 | u16 file_rec_len = sizeof(struct FInfo) + sizeof(struct FXInfo); | |
457 | u16 record_len = max(folder_rec_len, file_rec_len); | |
458 | u8 folder_finder_info[sizeof(struct DInfo) + sizeof(struct DXInfo)]; | |
459 | u8 file_finder_info[sizeof(struct FInfo) + sizeof(struct FXInfo)]; | |
460 | ||
461 | if (size >= record_len) { | |
462 | res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd); | |
463 | if (res) { | |
d6142673 | 464 | pr_err("can't init xattr find struct\n"); |
127e5f5a VD |
465 | return res; |
466 | } | |
467 | res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd); | |
468 | if (res) | |
469 | goto end_getxattr_finder_info; | |
470 | entry_type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset); | |
471 | ||
472 | if (entry_type == HFSPLUS_FOLDER) { | |
473 | hfs_bnode_read(fd.bnode, folder_finder_info, | |
474 | fd.entryoffset + | |
475 | offsetof(struct hfsplus_cat_folder, user_info), | |
476 | folder_rec_len); | |
477 | memcpy(value, folder_finder_info, folder_rec_len); | |
478 | res = folder_rec_len; | |
479 | } else if (entry_type == HFSPLUS_FILE) { | |
480 | hfs_bnode_read(fd.bnode, file_finder_info, | |
481 | fd.entryoffset + | |
482 | offsetof(struct hfsplus_cat_file, user_info), | |
483 | file_rec_len); | |
484 | memcpy(value, file_finder_info, file_rec_len); | |
485 | res = file_rec_len; | |
486 | } else { | |
487 | res = -EOPNOTSUPP; | |
488 | goto end_getxattr_finder_info; | |
489 | } | |
490 | } else | |
491 | res = size ? -ERANGE : record_len; | |
492 | ||
493 | end_getxattr_finder_info: | |
494 | if (size >= record_len) | |
495 | hfs_find_exit(&fd); | |
496 | return res; | |
497 | } | |
498 | ||
b4c1107c | 499 | ssize_t __hfsplus_getxattr(struct inode *inode, const char *name, |
127e5f5a VD |
500 | void *value, size_t size) |
501 | { | |
127e5f5a VD |
502 | struct hfs_find_data fd; |
503 | hfsplus_attr_entry *entry; | |
504 | __be32 xattr_record_type; | |
505 | u32 record_type; | |
506 | u16 record_length = 0; | |
507 | ssize_t res = 0; | |
508 | ||
509 | if ((!S_ISREG(inode->i_mode) && | |
510 | !S_ISDIR(inode->i_mode)) || | |
511 | HFSPLUS_IS_RSRC(inode)) | |
512 | return -EOPNOTSUPP; | |
513 | ||
127e5f5a | 514 | if (!strcmp_xattr_finder_info(name)) |
b4c1107c | 515 | return hfsplus_getxattr_finder_info(inode, value, size); |
127e5f5a VD |
516 | |
517 | if (!HFSPLUS_SB(inode->i_sb)->attr_tree) | |
518 | return -EOPNOTSUPP; | |
519 | ||
520 | entry = hfsplus_alloc_attr_entry(); | |
521 | if (!entry) { | |
d6142673 | 522 | pr_err("can't allocate xattr entry\n"); |
127e5f5a VD |
523 | return -ENOMEM; |
524 | } | |
525 | ||
526 | res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->attr_tree, &fd); | |
527 | if (res) { | |
d6142673 | 528 | pr_err("can't init xattr find struct\n"); |
127e5f5a VD |
529 | goto failed_getxattr_init; |
530 | } | |
531 | ||
532 | res = hfsplus_find_attr(inode->i_sb, inode->i_ino, name, &fd); | |
533 | if (res) { | |
534 | if (res == -ENOENT) | |
535 | res = -ENODATA; | |
536 | else | |
d6142673 | 537 | pr_err("xattr searching failed\n"); |
127e5f5a VD |
538 | goto out; |
539 | } | |
540 | ||
541 | hfs_bnode_read(fd.bnode, &xattr_record_type, | |
542 | fd.entryoffset, sizeof(xattr_record_type)); | |
543 | record_type = be32_to_cpu(xattr_record_type); | |
544 | if (record_type == HFSPLUS_ATTR_INLINE_DATA) { | |
545 | record_length = hfs_bnode_read_u16(fd.bnode, | |
546 | fd.entryoffset + | |
547 | offsetof(struct hfsplus_attr_inline_data, | |
548 | length)); | |
549 | if (record_length > HFSPLUS_MAX_INLINE_DATA_SIZE) { | |
d6142673 | 550 | pr_err("invalid xattr record size\n"); |
127e5f5a VD |
551 | res = -EIO; |
552 | goto out; | |
553 | } | |
554 | } else if (record_type == HFSPLUS_ATTR_FORK_DATA || | |
555 | record_type == HFSPLUS_ATTR_EXTENTS) { | |
d6142673 | 556 | pr_err("only inline data xattr are supported\n"); |
127e5f5a VD |
557 | res = -EOPNOTSUPP; |
558 | goto out; | |
559 | } else { | |
d6142673 | 560 | pr_err("invalid xattr record\n"); |
127e5f5a VD |
561 | res = -EIO; |
562 | goto out; | |
563 | } | |
564 | ||
565 | if (size) { | |
566 | hfs_bnode_read(fd.bnode, entry, fd.entryoffset, | |
567 | offsetof(struct hfsplus_attr_inline_data, | |
568 | raw_bytes) + record_length); | |
569 | } | |
570 | ||
571 | if (size >= record_length) { | |
572 | memcpy(value, entry->inline_data.raw_bytes, record_length); | |
573 | res = record_length; | |
574 | } else | |
575 | res = size ? -ERANGE : record_length; | |
576 | ||
577 | out: | |
578 | hfs_find_exit(&fd); | |
579 | ||
580 | failed_getxattr_init: | |
581 | hfsplus_destroy_attr_entry(entry); | |
582 | return res; | |
583 | } | |
584 | ||
a3cef4cd FF |
585 | ssize_t hfsplus_getxattr(struct dentry *dentry, const char *name, |
586 | void *value, size_t size, | |
587 | const char *prefix, size_t prefixlen) | |
588 | { | |
589 | int res; | |
590 | char *xattr_name; | |
591 | ||
592 | if (!strcmp(name, "")) | |
593 | return -EINVAL; | |
594 | ||
595 | xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1, | |
596 | GFP_KERNEL); | |
597 | if (!xattr_name) | |
598 | return -ENOMEM; | |
599 | ||
600 | strcpy(xattr_name, prefix); | |
601 | strcpy(xattr_name + prefixlen, name); | |
602 | ||
9ec3a646 | 603 | res = __hfsplus_getxattr(d_inode(dentry), xattr_name, value, size); |
a3cef4cd FF |
604 | kfree(xattr_name); |
605 | return res; | |
606 | ||
607 | } | |
608 | ||
127e5f5a VD |
609 | static inline int can_list(const char *xattr_name) |
610 | { | |
611 | if (!xattr_name) | |
612 | return 0; | |
613 | ||
614 | return strncmp(xattr_name, XATTR_TRUSTED_PREFIX, | |
615 | XATTR_TRUSTED_PREFIX_LEN) || | |
616 | capable(CAP_SYS_ADMIN); | |
617 | } | |
618 | ||
619 | static ssize_t hfsplus_listxattr_finder_info(struct dentry *dentry, | |
620 | char *buffer, size_t size) | |
621 | { | |
622 | ssize_t res = 0; | |
2b0143b5 | 623 | struct inode *inode = d_inode(dentry); |
127e5f5a VD |
624 | struct hfs_find_data fd; |
625 | u16 entry_type; | |
626 | u8 folder_finder_info[sizeof(struct DInfo) + sizeof(struct DXInfo)]; | |
627 | u8 file_finder_info[sizeof(struct FInfo) + sizeof(struct FXInfo)]; | |
628 | unsigned long len, found_bit; | |
629 | int xattr_name_len, symbols_count; | |
630 | ||
631 | res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd); | |
632 | if (res) { | |
d6142673 | 633 | pr_err("can't init xattr find struct\n"); |
127e5f5a VD |
634 | return res; |
635 | } | |
636 | ||
637 | res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd); | |
638 | if (res) | |
639 | goto end_listxattr_finder_info; | |
640 | ||
641 | entry_type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset); | |
642 | if (entry_type == HFSPLUS_FOLDER) { | |
643 | len = sizeof(struct DInfo) + sizeof(struct DXInfo); | |
644 | hfs_bnode_read(fd.bnode, folder_finder_info, | |
645 | fd.entryoffset + | |
646 | offsetof(struct hfsplus_cat_folder, user_info), | |
647 | len); | |
648 | found_bit = find_first_bit((void *)folder_finder_info, len*8); | |
649 | } else if (entry_type == HFSPLUS_FILE) { | |
650 | len = sizeof(struct FInfo) + sizeof(struct FXInfo); | |
651 | hfs_bnode_read(fd.bnode, file_finder_info, | |
652 | fd.entryoffset + | |
653 | offsetof(struct hfsplus_cat_file, user_info), | |
654 | len); | |
655 | found_bit = find_first_bit((void *)file_finder_info, len*8); | |
656 | } else { | |
657 | res = -EOPNOTSUPP; | |
658 | goto end_listxattr_finder_info; | |
659 | } | |
660 | ||
661 | if (found_bit >= (len*8)) | |
662 | res = 0; | |
663 | else { | |
664 | symbols_count = sizeof(HFSPLUS_XATTR_FINDER_INFO_NAME) - 1; | |
665 | xattr_name_len = | |
666 | name_len(HFSPLUS_XATTR_FINDER_INFO_NAME, symbols_count); | |
667 | if (!buffer || !size) { | |
668 | if (can_list(HFSPLUS_XATTR_FINDER_INFO_NAME)) | |
669 | res = xattr_name_len; | |
670 | } else if (can_list(HFSPLUS_XATTR_FINDER_INFO_NAME)) { | |
671 | if (size < xattr_name_len) | |
672 | res = -ERANGE; | |
673 | else { | |
674 | res = copy_name(buffer, | |
675 | HFSPLUS_XATTR_FINDER_INFO_NAME, | |
676 | symbols_count); | |
677 | } | |
678 | } | |
679 | } | |
680 | ||
681 | end_listxattr_finder_info: | |
682 | hfs_find_exit(&fd); | |
683 | ||
684 | return res; | |
685 | } | |
686 | ||
687 | ssize_t hfsplus_listxattr(struct dentry *dentry, char *buffer, size_t size) | |
688 | { | |
689 | ssize_t err; | |
690 | ssize_t res = 0; | |
2b0143b5 | 691 | struct inode *inode = d_inode(dentry); |
127e5f5a VD |
692 | struct hfs_find_data fd; |
693 | u16 key_len = 0; | |
694 | struct hfsplus_attr_key attr_key; | |
017f8da4 | 695 | char *strbuf; |
127e5f5a VD |
696 | int xattr_name_len; |
697 | ||
698 | if ((!S_ISREG(inode->i_mode) && | |
699 | !S_ISDIR(inode->i_mode)) || | |
700 | HFSPLUS_IS_RSRC(inode)) | |
701 | return -EOPNOTSUPP; | |
702 | ||
703 | res = hfsplus_listxattr_finder_info(dentry, buffer, size); | |
704 | if (res < 0) | |
705 | return res; | |
706 | else if (!HFSPLUS_SB(inode->i_sb)->attr_tree) | |
707 | return (res == 0) ? -EOPNOTSUPP : res; | |
708 | ||
709 | err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->attr_tree, &fd); | |
710 | if (err) { | |
d6142673 | 711 | pr_err("can't init xattr find struct\n"); |
127e5f5a VD |
712 | return err; |
713 | } | |
714 | ||
017f8da4 HTL |
715 | strbuf = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + |
716 | XATTR_MAC_OSX_PREFIX_LEN + 1, GFP_KERNEL); | |
717 | if (!strbuf) { | |
718 | res = -ENOMEM; | |
719 | goto out; | |
720 | } | |
721 | ||
127e5f5a VD |
722 | err = hfsplus_find_attr(inode->i_sb, inode->i_ino, NULL, &fd); |
723 | if (err) { | |
724 | if (err == -ENOENT) { | |
725 | if (res == 0) | |
726 | res = -ENODATA; | |
727 | goto end_listxattr; | |
728 | } else { | |
729 | res = err; | |
730 | goto end_listxattr; | |
731 | } | |
732 | } | |
733 | ||
734 | for (;;) { | |
735 | key_len = hfs_bnode_read_u16(fd.bnode, fd.keyoffset); | |
736 | if (key_len == 0 || key_len > fd.tree->max_key_len) { | |
d6142673 | 737 | pr_err("invalid xattr key length: %d\n", key_len); |
127e5f5a VD |
738 | res = -EIO; |
739 | goto end_listxattr; | |
740 | } | |
741 | ||
742 | hfs_bnode_read(fd.bnode, &attr_key, | |
743 | fd.keyoffset, key_len + sizeof(key_len)); | |
744 | ||
745 | if (be32_to_cpu(attr_key.cnid) != inode->i_ino) | |
746 | goto end_listxattr; | |
747 | ||
017f8da4 | 748 | xattr_name_len = NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN; |
127e5f5a VD |
749 | if (hfsplus_uni2asc(inode->i_sb, |
750 | (const struct hfsplus_unistr *)&fd.key->attr.key_name, | |
751 | strbuf, &xattr_name_len)) { | |
d6142673 | 752 | pr_err("unicode conversion failed\n"); |
127e5f5a VD |
753 | res = -EIO; |
754 | goto end_listxattr; | |
755 | } | |
756 | ||
757 | if (!buffer || !size) { | |
758 | if (can_list(strbuf)) | |
759 | res += name_len(strbuf, xattr_name_len); | |
760 | } else if (can_list(strbuf)) { | |
761 | if (size < (res + name_len(strbuf, xattr_name_len))) { | |
762 | res = -ERANGE; | |
763 | goto end_listxattr; | |
764 | } else | |
765 | res += copy_name(buffer + res, | |
766 | strbuf, xattr_name_len); | |
767 | } | |
768 | ||
769 | if (hfs_brec_goto(&fd, 1)) | |
770 | goto end_listxattr; | |
771 | } | |
772 | ||
773 | end_listxattr: | |
017f8da4 HTL |
774 | kfree(strbuf); |
775 | out: | |
127e5f5a VD |
776 | hfs_find_exit(&fd); |
777 | return res; | |
778 | } | |
779 | ||
b168fff7 | 780 | static int hfsplus_removexattr(struct inode *inode, const char *name) |
127e5f5a VD |
781 | { |
782 | int err = 0; | |
127e5f5a VD |
783 | struct hfs_find_data cat_fd; |
784 | u16 flags; | |
785 | u16 cat_entry_type; | |
786 | int is_xattr_acl_deleted = 0; | |
787 | int is_all_xattrs_deleted = 0; | |
788 | ||
127e5f5a VD |
789 | if (!HFSPLUS_SB(inode->i_sb)->attr_tree) |
790 | return -EOPNOTSUPP; | |
791 | ||
127e5f5a VD |
792 | if (!strcmp_xattr_finder_info(name)) |
793 | return -EOPNOTSUPP; | |
794 | ||
795 | err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &cat_fd); | |
796 | if (err) { | |
d6142673 | 797 | pr_err("can't init xattr find struct\n"); |
127e5f5a VD |
798 | return err; |
799 | } | |
800 | ||
801 | err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &cat_fd); | |
802 | if (err) { | |
d6142673 | 803 | pr_err("catalog searching failed\n"); |
127e5f5a VD |
804 | goto end_removexattr; |
805 | } | |
806 | ||
807 | err = hfsplus_delete_attr(inode, name); | |
808 | if (err) | |
809 | goto end_removexattr; | |
810 | ||
811 | is_xattr_acl_deleted = !strcmp_xattr_acl(name); | |
812 | is_all_xattrs_deleted = !hfsplus_attr_exists(inode, NULL); | |
813 | ||
814 | if (!is_xattr_acl_deleted && !is_all_xattrs_deleted) | |
815 | goto end_removexattr; | |
816 | ||
817 | cat_entry_type = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset); | |
818 | ||
819 | if (cat_entry_type == HFSPLUS_FOLDER) { | |
820 | flags = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset + | |
821 | offsetof(struct hfsplus_cat_folder, flags)); | |
822 | if (is_xattr_acl_deleted) | |
823 | flags &= ~HFSPLUS_ACL_EXISTS; | |
824 | if (is_all_xattrs_deleted) | |
825 | flags &= ~HFSPLUS_XATTR_EXISTS; | |
826 | hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset + | |
827 | offsetof(struct hfsplus_cat_folder, flags), | |
828 | flags); | |
829 | hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY); | |
830 | } else if (cat_entry_type == HFSPLUS_FILE) { | |
831 | flags = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset + | |
832 | offsetof(struct hfsplus_cat_file, flags)); | |
833 | if (is_xattr_acl_deleted) | |
834 | flags &= ~HFSPLUS_ACL_EXISTS; | |
835 | if (is_all_xattrs_deleted) | |
836 | flags &= ~HFSPLUS_XATTR_EXISTS; | |
837 | hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset + | |
838 | offsetof(struct hfsplus_cat_file, flags), | |
839 | flags); | |
840 | hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY); | |
841 | } else { | |
d6142673 | 842 | pr_err("invalid catalog entry type\n"); |
127e5f5a VD |
843 | err = -EIO; |
844 | goto end_removexattr; | |
845 | } | |
846 | ||
847 | end_removexattr: | |
848 | hfs_find_exit(&cat_fd); | |
849 | return err; | |
850 | } | |
851 | ||
852 | static int hfsplus_osx_getxattr(struct dentry *dentry, const char *name, | |
853 | void *buffer, size_t size, int type) | |
854 | { | |
127e5f5a VD |
855 | if (!strcmp(name, "")) |
856 | return -EINVAL; | |
857 | ||
b168fff7 CH |
858 | /* |
859 | * Don't allow retrieving properly prefixed attributes | |
860 | * by prepending them with "osx." | |
861 | */ | |
862 | if (is_known_namespace(name)) | |
863 | return -EOPNOTSUPP; | |
127e5f5a | 864 | |
db579e76 TH |
865 | /* |
866 | * osx is the namespace we use to indicate an unprefixed | |
867 | * attribute on the filesystem (like the ones that OS X | |
868 | * creates), so we pass the name through unmodified (after | |
869 | * ensuring it doesn't conflict with another namespace). | |
870 | */ | |
9ec3a646 | 871 | return __hfsplus_getxattr(d_inode(dentry), name, buffer, size); |
127e5f5a VD |
872 | } |
873 | ||
874 | static int hfsplus_osx_setxattr(struct dentry *dentry, const char *name, | |
875 | const void *buffer, size_t size, int flags, int type) | |
876 | { | |
127e5f5a VD |
877 | if (!strcmp(name, "")) |
878 | return -EINVAL; | |
879 | ||
b168fff7 CH |
880 | /* |
881 | * Don't allow setting properly prefixed attributes | |
882 | * by prepending them with "osx." | |
883 | */ | |
2796e4ce CH |
884 | if (is_known_namespace(name)) |
885 | return -EOPNOTSUPP; | |
886 | ||
db579e76 TH |
887 | /* |
888 | * osx is the namespace we use to indicate an unprefixed | |
889 | * attribute on the filesystem (like the ones that OS X | |
890 | * creates), so we pass the name through unmodified (after | |
891 | * ensuring it doesn't conflict with another namespace). | |
892 | */ | |
9ec3a646 | 893 | return __hfsplus_setxattr(d_inode(dentry), name, buffer, size, flags); |
127e5f5a VD |
894 | } |
895 | ||
896 | static size_t hfsplus_osx_listxattr(struct dentry *dentry, char *list, | |
897 | size_t list_size, const char *name, size_t name_len, int type) | |
898 | { | |
899 | /* | |
900 | * This method is not used. | |
901 | * It is used hfsplus_listxattr() instead of generic_listxattr(). | |
902 | */ | |
903 | return -EOPNOTSUPP; | |
904 | } | |
905 | ||
906 | const struct xattr_handler hfsplus_xattr_osx_handler = { | |
907 | .prefix = XATTR_MAC_OSX_PREFIX, | |
908 | .list = hfsplus_osx_listxattr, | |
909 | .get = hfsplus_osx_getxattr, | |
910 | .set = hfsplus_osx_setxattr, | |
911 | }; |