Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
127e5f5a VD |
2 | /* |
3 | * linux/fs/hfsplus/xattr.c | |
4 | * | |
5 | * Vyacheslav Dubeyko <slava@dubeyko.com> | |
6 | * | |
7 | * Logic of processing extended attributes | |
8 | */ | |
9 | ||
10 | #include "hfsplus_fs.h" | |
017f8da4 | 11 | #include <linux/nls.h> |
127e5f5a VD |
12 | #include "xattr.h" |
13 | ||
b168fff7 CH |
14 | static int hfsplus_removexattr(struct inode *inode, const char *name); |
15 | ||
127e5f5a VD |
16 | const struct xattr_handler *hfsplus_xattr_handlers[] = { |
17 | &hfsplus_xattr_osx_handler, | |
18 | &hfsplus_xattr_user_handler, | |
19 | &hfsplus_xattr_trusted_handler, | |
20 | &hfsplus_xattr_security_handler, | |
21 | NULL | |
22 | }; | |
23 | ||
24 | static int strcmp_xattr_finder_info(const char *name) | |
25 | { | |
26 | if (name) { | |
27 | return strncmp(name, HFSPLUS_XATTR_FINDER_INFO_NAME, | |
28 | sizeof(HFSPLUS_XATTR_FINDER_INFO_NAME)); | |
29 | } | |
30 | return -1; | |
31 | } | |
32 | ||
33 | static int strcmp_xattr_acl(const char *name) | |
34 | { | |
35 | if (name) { | |
36 | return strncmp(name, HFSPLUS_XATTR_ACL_NAME, | |
37 | sizeof(HFSPLUS_XATTR_ACL_NAME)); | |
38 | } | |
39 | return -1; | |
40 | } | |
41 | ||
1ad8d63d | 42 | static bool is_known_namespace(const char *name) |
127e5f5a VD |
43 | { |
44 | if (strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN) && | |
45 | strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN) && | |
46 | strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) && | |
47 | strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN)) | |
48 | return false; | |
49 | ||
50 | return true; | |
51 | } | |
52 | ||
099e9245 VD |
53 | static void hfsplus_init_header_node(struct inode *attr_file, |
54 | u32 clump_size, | |
a99b7069 | 55 | char *buf, u16 node_size) |
099e9245 VD |
56 | { |
57 | struct hfs_bnode_desc *desc; | |
58 | struct hfs_btree_header_rec *head; | |
59 | u16 offset; | |
60 | __be16 *rec_offsets; | |
61 | u32 hdr_node_map_rec_bits; | |
62 | char *bmp; | |
63 | u32 used_nodes; | |
64 | u32 used_bmp_bytes; | |
df3d4e7a | 65 | u64 tmp; |
099e9245 | 66 | |
a99b7069 | 67 | hfs_dbg(ATTR_MOD, "init_hdr_attr_file: clump %u, node_size %u\n", |
b73f3d0e | 68 | clump_size, node_size); |
099e9245 VD |
69 | |
70 | /* The end of the node contains list of record offsets */ | |
71 | rec_offsets = (__be16 *)(buf + node_size); | |
72 | ||
73 | desc = (struct hfs_bnode_desc *)buf; | |
74 | desc->type = HFS_NODE_HEADER; | |
75 | desc->num_recs = cpu_to_be16(HFSPLUS_BTREE_HDR_NODE_RECS_COUNT); | |
76 | offset = sizeof(struct hfs_bnode_desc); | |
77 | *--rec_offsets = cpu_to_be16(offset); | |
78 | ||
79 | head = (struct hfs_btree_header_rec *)(buf + offset); | |
80 | head->node_size = cpu_to_be16(node_size); | |
a99b7069 GU |
81 | tmp = i_size_read(attr_file); |
82 | do_div(tmp, node_size); | |
83 | head->node_count = cpu_to_be32(tmp); | |
099e9245 VD |
84 | head->free_nodes = cpu_to_be32(be32_to_cpu(head->node_count) - 1); |
85 | head->clump_size = cpu_to_be32(clump_size); | |
86 | head->attributes |= cpu_to_be32(HFS_TREE_BIGKEYS | HFS_TREE_VARIDXKEYS); | |
87 | head->max_key_len = cpu_to_be16(HFSPLUS_ATTR_KEYLEN - sizeof(u16)); | |
88 | offset += sizeof(struct hfs_btree_header_rec); | |
89 | *--rec_offsets = cpu_to_be16(offset); | |
90 | offset += HFSPLUS_BTREE_HDR_USER_BYTES; | |
91 | *--rec_offsets = cpu_to_be16(offset); | |
92 | ||
93 | hdr_node_map_rec_bits = 8 * (node_size - offset - (4 * sizeof(u16))); | |
94 | if (be32_to_cpu(head->node_count) > hdr_node_map_rec_bits) { | |
95 | u32 map_node_bits; | |
96 | u32 map_nodes; | |
97 | ||
98 | desc->next = cpu_to_be32(be32_to_cpu(head->leaf_tail) + 1); | |
99 | map_node_bits = 8 * (node_size - sizeof(struct hfs_bnode_desc) - | |
100 | (2 * sizeof(u16)) - 2); | |
101 | map_nodes = (be32_to_cpu(head->node_count) - | |
102 | hdr_node_map_rec_bits + | |
103 | (map_node_bits - 1)) / map_node_bits; | |
104 | be32_add_cpu(&head->free_nodes, 0 - map_nodes); | |
105 | } | |
106 | ||
107 | bmp = buf + offset; | |
108 | used_nodes = | |
109 | be32_to_cpu(head->node_count) - be32_to_cpu(head->free_nodes); | |
110 | used_bmp_bytes = used_nodes / 8; | |
111 | if (used_bmp_bytes) { | |
112 | memset(bmp, 0xFF, used_bmp_bytes); | |
113 | bmp += used_bmp_bytes; | |
114 | used_nodes %= 8; | |
115 | } | |
116 | *bmp = ~(0xFF >> used_nodes); | |
117 | offset += hdr_node_map_rec_bits / 8; | |
118 | *--rec_offsets = cpu_to_be16(offset); | |
119 | } | |
120 | ||
95e0d7db VD |
121 | static int hfsplus_create_attributes_file(struct super_block *sb) |
122 | { | |
123 | int err = 0; | |
124 | struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); | |
125 | struct inode *attr_file; | |
126 | struct hfsplus_inode_info *hip; | |
127 | u32 clump_size; | |
128 | u16 node_size = HFSPLUS_ATTR_TREE_NODE_SIZE; | |
129 | char *buf; | |
130 | int index, written; | |
131 | struct address_space *mapping; | |
132 | struct page *page; | |
133 | int old_state = HFSPLUS_EMPTY_ATTR_TREE; | |
134 | ||
135 | hfs_dbg(ATTR_MOD, "create_attr_file: ino %d\n", HFSPLUS_ATTR_CNID); | |
136 | ||
137 | check_attr_tree_state_again: | |
138 | switch (atomic_read(&sbi->attr_tree_state)) { | |
139 | case HFSPLUS_EMPTY_ATTR_TREE: | |
140 | if (old_state != atomic_cmpxchg(&sbi->attr_tree_state, | |
141 | old_state, | |
142 | HFSPLUS_CREATING_ATTR_TREE)) | |
143 | goto check_attr_tree_state_again; | |
144 | break; | |
145 | case HFSPLUS_CREATING_ATTR_TREE: | |
146 | /* | |
147 | * This state means that another thread is in process | |
148 | * of AttributesFile creation. Theoretically, it is | |
149 | * possible to be here. But really __setxattr() method | |
150 | * first of all calls hfs_find_init() for lookup in | |
151 | * B-tree of CatalogFile. This method locks mutex of | |
152 | * CatalogFile's B-tree. As a result, if some thread | |
153 | * is inside AttributedFile creation operation then | |
154 | * another threads will be waiting unlocking of | |
155 | * CatalogFile's B-tree's mutex. However, if code will | |
156 | * change then we will return error code (-EAGAIN) from | |
157 | * here. Really, it means that first try to set of xattr | |
158 | * fails with error but second attempt will have success. | |
159 | */ | |
160 | return -EAGAIN; | |
161 | case HFSPLUS_VALID_ATTR_TREE: | |
162 | return 0; | |
163 | case HFSPLUS_FAILED_ATTR_TREE: | |
164 | return -EOPNOTSUPP; | |
165 | default: | |
166 | BUG(); | |
167 | } | |
168 | ||
169 | attr_file = hfsplus_iget(sb, HFSPLUS_ATTR_CNID); | |
170 | if (IS_ERR(attr_file)) { | |
171 | pr_err("failed to load attributes file\n"); | |
172 | return PTR_ERR(attr_file); | |
173 | } | |
174 | ||
175 | BUG_ON(i_size_read(attr_file) != 0); | |
176 | ||
177 | hip = HFSPLUS_I(attr_file); | |
178 | ||
179 | clump_size = hfsplus_calc_btree_clump_size(sb->s_blocksize, | |
180 | node_size, | |
181 | sbi->sect_count, | |
182 | HFSPLUS_ATTR_CNID); | |
183 | ||
184 | mutex_lock(&hip->extents_lock); | |
185 | hip->clump_blocks = clump_size >> sbi->alloc_blksz_shift; | |
186 | mutex_unlock(&hip->extents_lock); | |
187 | ||
188 | if (sbi->free_blocks <= (hip->clump_blocks << 1)) { | |
189 | err = -ENOSPC; | |
190 | goto end_attr_file_creation; | |
191 | } | |
192 | ||
193 | while (hip->alloc_blocks < hip->clump_blocks) { | |
2cd282a1 | 194 | err = hfsplus_file_extend(attr_file, false); |
95e0d7db VD |
195 | if (unlikely(err)) { |
196 | pr_err("failed to extend attributes file\n"); | |
197 | goto end_attr_file_creation; | |
198 | } | |
199 | hip->phys_size = attr_file->i_size = | |
200 | (loff_t)hip->alloc_blocks << sbi->alloc_blksz_shift; | |
201 | hip->fs_blocks = hip->alloc_blocks << sbi->fs_shift; | |
202 | inode_set_bytes(attr_file, attr_file->i_size); | |
203 | } | |
204 | ||
205 | buf = kzalloc(node_size, GFP_NOFS); | |
206 | if (!buf) { | |
95e0d7db VD |
207 | err = -ENOMEM; |
208 | goto end_attr_file_creation; | |
209 | } | |
210 | ||
211 | hfsplus_init_header_node(attr_file, clump_size, buf, node_size); | |
212 | ||
213 | mapping = attr_file->i_mapping; | |
214 | ||
215 | index = 0; | |
216 | written = 0; | |
09cbfeaf | 217 | for (; written < node_size; index++, written += PAGE_SIZE) { |
95e0d7db VD |
218 | void *kaddr; |
219 | ||
220 | page = read_mapping_page(mapping, index, NULL); | |
221 | if (IS_ERR(page)) { | |
222 | err = PTR_ERR(page); | |
223 | goto failed_header_node_init; | |
224 | } | |
225 | ||
226 | kaddr = kmap_atomic(page); | |
227 | memcpy(kaddr, buf + written, | |
09cbfeaf | 228 | min_t(size_t, PAGE_SIZE, node_size - written)); |
95e0d7db VD |
229 | kunmap_atomic(kaddr); |
230 | ||
231 | set_page_dirty(page); | |
09cbfeaf | 232 | put_page(page); |
95e0d7db VD |
233 | } |
234 | ||
235 | hfsplus_mark_inode_dirty(attr_file, HFSPLUS_I_ATTR_DIRTY); | |
236 | ||
237 | sbi->attr_tree = hfs_btree_open(sb, HFSPLUS_ATTR_CNID); | |
238 | if (!sbi->attr_tree) | |
239 | pr_err("failed to load attributes file\n"); | |
240 | ||
241 | failed_header_node_init: | |
242 | kfree(buf); | |
243 | ||
244 | end_attr_file_creation: | |
245 | iput(attr_file); | |
246 | ||
247 | if (!err) | |
248 | atomic_set(&sbi->attr_tree_state, HFSPLUS_VALID_ATTR_TREE); | |
249 | else if (err == -ENOSPC) | |
250 | atomic_set(&sbi->attr_tree_state, HFSPLUS_EMPTY_ATTR_TREE); | |
251 | else | |
252 | atomic_set(&sbi->attr_tree_state, HFSPLUS_FAILED_ATTR_TREE); | |
253 | ||
254 | return err; | |
255 | } | |
256 | ||
127e5f5a VD |
257 | int __hfsplus_setxattr(struct inode *inode, const char *name, |
258 | const void *value, size_t size, int flags) | |
259 | { | |
260 | int err = 0; | |
261 | struct hfs_find_data cat_fd; | |
262 | hfsplus_cat_entry entry; | |
263 | u16 cat_entry_flags, cat_entry_type; | |
264 | u16 folder_finderinfo_len = sizeof(struct DInfo) + | |
265 | sizeof(struct DXInfo); | |
266 | u16 file_finderinfo_len = sizeof(struct FInfo) + | |
267 | sizeof(struct FXInfo); | |
268 | ||
269 | if ((!S_ISREG(inode->i_mode) && | |
270 | !S_ISDIR(inode->i_mode)) || | |
271 | HFSPLUS_IS_RSRC(inode)) | |
272 | return -EOPNOTSUPP; | |
273 | ||
b168fff7 CH |
274 | if (value == NULL) |
275 | return hfsplus_removexattr(inode, name); | |
127e5f5a VD |
276 | |
277 | err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &cat_fd); | |
278 | if (err) { | |
d6142673 | 279 | pr_err("can't init xattr find struct\n"); |
127e5f5a VD |
280 | return err; |
281 | } | |
282 | ||
283 | err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &cat_fd); | |
284 | if (err) { | |
d6142673 | 285 | pr_err("catalog searching failed\n"); |
127e5f5a VD |
286 | goto end_setxattr; |
287 | } | |
288 | ||
289 | if (!strcmp_xattr_finder_info(name)) { | |
290 | if (flags & XATTR_CREATE) { | |
d6142673 | 291 | pr_err("xattr exists yet\n"); |
127e5f5a VD |
292 | err = -EOPNOTSUPP; |
293 | goto end_setxattr; | |
294 | } | |
295 | hfs_bnode_read(cat_fd.bnode, &entry, cat_fd.entryoffset, | |
296 | sizeof(hfsplus_cat_entry)); | |
297 | if (be16_to_cpu(entry.type) == HFSPLUS_FOLDER) { | |
298 | if (size == folder_finderinfo_len) { | |
299 | memcpy(&entry.folder.user_info, value, | |
300 | folder_finderinfo_len); | |
301 | hfs_bnode_write(cat_fd.bnode, &entry, | |
302 | cat_fd.entryoffset, | |
303 | sizeof(struct hfsplus_cat_folder)); | |
304 | hfsplus_mark_inode_dirty(inode, | |
305 | HFSPLUS_I_CAT_DIRTY); | |
306 | } else { | |
307 | err = -ERANGE; | |
308 | goto end_setxattr; | |
309 | } | |
310 | } else if (be16_to_cpu(entry.type) == HFSPLUS_FILE) { | |
311 | if (size == file_finderinfo_len) { | |
312 | memcpy(&entry.file.user_info, value, | |
313 | file_finderinfo_len); | |
314 | hfs_bnode_write(cat_fd.bnode, &entry, | |
315 | cat_fd.entryoffset, | |
316 | sizeof(struct hfsplus_cat_file)); | |
317 | hfsplus_mark_inode_dirty(inode, | |
318 | HFSPLUS_I_CAT_DIRTY); | |
319 | } else { | |
320 | err = -ERANGE; | |
321 | goto end_setxattr; | |
322 | } | |
323 | } else { | |
324 | err = -EOPNOTSUPP; | |
325 | goto end_setxattr; | |
326 | } | |
327 | goto end_setxattr; | |
328 | } | |
329 | ||
330 | if (!HFSPLUS_SB(inode->i_sb)->attr_tree) { | |
95e0d7db VD |
331 | err = hfsplus_create_attributes_file(inode->i_sb); |
332 | if (unlikely(err)) | |
333 | goto end_setxattr; | |
127e5f5a VD |
334 | } |
335 | ||
336 | if (hfsplus_attr_exists(inode, name)) { | |
337 | if (flags & XATTR_CREATE) { | |
d6142673 | 338 | pr_err("xattr exists yet\n"); |
127e5f5a VD |
339 | err = -EOPNOTSUPP; |
340 | goto end_setxattr; | |
341 | } | |
342 | err = hfsplus_delete_attr(inode, name); | |
343 | if (err) | |
344 | goto end_setxattr; | |
345 | err = hfsplus_create_attr(inode, name, value, size); | |
346 | if (err) | |
347 | goto end_setxattr; | |
348 | } else { | |
349 | if (flags & XATTR_REPLACE) { | |
d6142673 | 350 | pr_err("cannot replace xattr\n"); |
127e5f5a VD |
351 | err = -EOPNOTSUPP; |
352 | goto end_setxattr; | |
353 | } | |
354 | err = hfsplus_create_attr(inode, name, value, size); | |
355 | if (err) | |
356 | goto end_setxattr; | |
357 | } | |
358 | ||
359 | cat_entry_type = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset); | |
360 | if (cat_entry_type == HFSPLUS_FOLDER) { | |
361 | cat_entry_flags = hfs_bnode_read_u16(cat_fd.bnode, | |
362 | cat_fd.entryoffset + | |
363 | offsetof(struct hfsplus_cat_folder, flags)); | |
364 | cat_entry_flags |= HFSPLUS_XATTR_EXISTS; | |
365 | if (!strcmp_xattr_acl(name)) | |
366 | cat_entry_flags |= HFSPLUS_ACL_EXISTS; | |
367 | hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset + | |
368 | offsetof(struct hfsplus_cat_folder, flags), | |
369 | cat_entry_flags); | |
370 | hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY); | |
371 | } else if (cat_entry_type == HFSPLUS_FILE) { | |
372 | cat_entry_flags = hfs_bnode_read_u16(cat_fd.bnode, | |
373 | cat_fd.entryoffset + | |
374 | offsetof(struct hfsplus_cat_file, flags)); | |
375 | cat_entry_flags |= HFSPLUS_XATTR_EXISTS; | |
376 | if (!strcmp_xattr_acl(name)) | |
377 | cat_entry_flags |= HFSPLUS_ACL_EXISTS; | |
378 | hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset + | |
379 | offsetof(struct hfsplus_cat_file, flags), | |
380 | cat_entry_flags); | |
381 | hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY); | |
382 | } else { | |
d6142673 | 383 | pr_err("invalid catalog entry type\n"); |
127e5f5a VD |
384 | err = -EIO; |
385 | goto end_setxattr; | |
386 | } | |
387 | ||
388 | end_setxattr: | |
389 | hfs_find_exit(&cat_fd); | |
390 | return err; | |
391 | } | |
392 | ||
127e5f5a VD |
393 | static int name_len(const char *xattr_name, int xattr_name_len) |
394 | { | |
395 | int len = xattr_name_len + 1; | |
396 | ||
b168fff7 | 397 | if (!is_known_namespace(xattr_name)) |
127e5f5a VD |
398 | len += XATTR_MAC_OSX_PREFIX_LEN; |
399 | ||
400 | return len; | |
401 | } | |
402 | ||
403 | static int copy_name(char *buffer, const char *xattr_name, int name_len) | |
404 | { | |
405 | int len = name_len; | |
406 | int offset = 0; | |
407 | ||
b168fff7 | 408 | if (!is_known_namespace(xattr_name)) { |
29774f3f | 409 | memcpy(buffer, XATTR_MAC_OSX_PREFIX, XATTR_MAC_OSX_PREFIX_LEN); |
127e5f5a VD |
410 | offset += XATTR_MAC_OSX_PREFIX_LEN; |
411 | len += XATTR_MAC_OSX_PREFIX_LEN; | |
412 | } | |
413 | ||
414 | strncpy(buffer + offset, xattr_name, name_len); | |
415 | memset(buffer + offset + name_len, 0, 1); | |
416 | len += 1; | |
417 | ||
418 | return len; | |
419 | } | |
420 | ||
59301226 | 421 | int hfsplus_setxattr(struct inode *inode, const char *name, |
5e61473e FF |
422 | const void *value, size_t size, int flags, |
423 | const char *prefix, size_t prefixlen) | |
424 | { | |
425 | char *xattr_name; | |
426 | int res; | |
427 | ||
5e61473e FF |
428 | xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1, |
429 | GFP_KERNEL); | |
430 | if (!xattr_name) | |
431 | return -ENOMEM; | |
432 | strcpy(xattr_name, prefix); | |
433 | strcpy(xattr_name + prefixlen, name); | |
59301226 | 434 | res = __hfsplus_setxattr(inode, xattr_name, value, size, flags); |
5e61473e FF |
435 | kfree(xattr_name); |
436 | return res; | |
437 | } | |
438 | ||
b4c1107c | 439 | static ssize_t hfsplus_getxattr_finder_info(struct inode *inode, |
127e5f5a VD |
440 | void *value, size_t size) |
441 | { | |
442 | ssize_t res = 0; | |
127e5f5a VD |
443 | struct hfs_find_data fd; |
444 | u16 entry_type; | |
445 | u16 folder_rec_len = sizeof(struct DInfo) + sizeof(struct DXInfo); | |
446 | u16 file_rec_len = sizeof(struct FInfo) + sizeof(struct FXInfo); | |
447 | u16 record_len = max(folder_rec_len, file_rec_len); | |
448 | u8 folder_finder_info[sizeof(struct DInfo) + sizeof(struct DXInfo)]; | |
449 | u8 file_finder_info[sizeof(struct FInfo) + sizeof(struct FXInfo)]; | |
450 | ||
451 | if (size >= record_len) { | |
452 | res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd); | |
453 | if (res) { | |
d6142673 | 454 | pr_err("can't init xattr find struct\n"); |
127e5f5a VD |
455 | return res; |
456 | } | |
457 | res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd); | |
458 | if (res) | |
459 | goto end_getxattr_finder_info; | |
460 | entry_type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset); | |
461 | ||
462 | if (entry_type == HFSPLUS_FOLDER) { | |
463 | hfs_bnode_read(fd.bnode, folder_finder_info, | |
464 | fd.entryoffset + | |
465 | offsetof(struct hfsplus_cat_folder, user_info), | |
466 | folder_rec_len); | |
467 | memcpy(value, folder_finder_info, folder_rec_len); | |
468 | res = folder_rec_len; | |
469 | } else if (entry_type == HFSPLUS_FILE) { | |
470 | hfs_bnode_read(fd.bnode, file_finder_info, | |
471 | fd.entryoffset + | |
472 | offsetof(struct hfsplus_cat_file, user_info), | |
473 | file_rec_len); | |
474 | memcpy(value, file_finder_info, file_rec_len); | |
475 | res = file_rec_len; | |
476 | } else { | |
477 | res = -EOPNOTSUPP; | |
478 | goto end_getxattr_finder_info; | |
479 | } | |
480 | } else | |
481 | res = size ? -ERANGE : record_len; | |
482 | ||
483 | end_getxattr_finder_info: | |
484 | if (size >= record_len) | |
485 | hfs_find_exit(&fd); | |
486 | return res; | |
487 | } | |
488 | ||
b4c1107c | 489 | ssize_t __hfsplus_getxattr(struct inode *inode, const char *name, |
127e5f5a VD |
490 | void *value, size_t size) |
491 | { | |
127e5f5a VD |
492 | struct hfs_find_data fd; |
493 | hfsplus_attr_entry *entry; | |
494 | __be32 xattr_record_type; | |
495 | u32 record_type; | |
496 | u16 record_length = 0; | |
497 | ssize_t res = 0; | |
498 | ||
499 | if ((!S_ISREG(inode->i_mode) && | |
500 | !S_ISDIR(inode->i_mode)) || | |
501 | HFSPLUS_IS_RSRC(inode)) | |
502 | return -EOPNOTSUPP; | |
503 | ||
127e5f5a | 504 | if (!strcmp_xattr_finder_info(name)) |
b4c1107c | 505 | return hfsplus_getxattr_finder_info(inode, value, size); |
127e5f5a VD |
506 | |
507 | if (!HFSPLUS_SB(inode->i_sb)->attr_tree) | |
508 | return -EOPNOTSUPP; | |
509 | ||
510 | entry = hfsplus_alloc_attr_entry(); | |
511 | if (!entry) { | |
d6142673 | 512 | pr_err("can't allocate xattr entry\n"); |
127e5f5a VD |
513 | return -ENOMEM; |
514 | } | |
515 | ||
516 | res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->attr_tree, &fd); | |
517 | if (res) { | |
d6142673 | 518 | pr_err("can't init xattr find struct\n"); |
127e5f5a VD |
519 | goto failed_getxattr_init; |
520 | } | |
521 | ||
522 | res = hfsplus_find_attr(inode->i_sb, inode->i_ino, name, &fd); | |
523 | if (res) { | |
524 | if (res == -ENOENT) | |
525 | res = -ENODATA; | |
526 | else | |
d6142673 | 527 | pr_err("xattr searching failed\n"); |
127e5f5a VD |
528 | goto out; |
529 | } | |
530 | ||
531 | hfs_bnode_read(fd.bnode, &xattr_record_type, | |
532 | fd.entryoffset, sizeof(xattr_record_type)); | |
533 | record_type = be32_to_cpu(xattr_record_type); | |
534 | if (record_type == HFSPLUS_ATTR_INLINE_DATA) { | |
535 | record_length = hfs_bnode_read_u16(fd.bnode, | |
536 | fd.entryoffset + | |
537 | offsetof(struct hfsplus_attr_inline_data, | |
538 | length)); | |
539 | if (record_length > HFSPLUS_MAX_INLINE_DATA_SIZE) { | |
d6142673 | 540 | pr_err("invalid xattr record size\n"); |
127e5f5a VD |
541 | res = -EIO; |
542 | goto out; | |
543 | } | |
544 | } else if (record_type == HFSPLUS_ATTR_FORK_DATA || | |
545 | record_type == HFSPLUS_ATTR_EXTENTS) { | |
d6142673 | 546 | pr_err("only inline data xattr are supported\n"); |
127e5f5a VD |
547 | res = -EOPNOTSUPP; |
548 | goto out; | |
549 | } else { | |
d6142673 | 550 | pr_err("invalid xattr record\n"); |
127e5f5a VD |
551 | res = -EIO; |
552 | goto out; | |
553 | } | |
554 | ||
555 | if (size) { | |
556 | hfs_bnode_read(fd.bnode, entry, fd.entryoffset, | |
557 | offsetof(struct hfsplus_attr_inline_data, | |
558 | raw_bytes) + record_length); | |
559 | } | |
560 | ||
561 | if (size >= record_length) { | |
562 | memcpy(value, entry->inline_data.raw_bytes, record_length); | |
563 | res = record_length; | |
564 | } else | |
565 | res = size ? -ERANGE : record_length; | |
566 | ||
567 | out: | |
568 | hfs_find_exit(&fd); | |
569 | ||
570 | failed_getxattr_init: | |
571 | hfsplus_destroy_attr_entry(entry); | |
572 | return res; | |
573 | } | |
574 | ||
b296821a | 575 | ssize_t hfsplus_getxattr(struct inode *inode, const char *name, |
a3cef4cd FF |
576 | void *value, size_t size, |
577 | const char *prefix, size_t prefixlen) | |
578 | { | |
579 | int res; | |
580 | char *xattr_name; | |
581 | ||
a3cef4cd FF |
582 | xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1, |
583 | GFP_KERNEL); | |
584 | if (!xattr_name) | |
585 | return -ENOMEM; | |
586 | ||
587 | strcpy(xattr_name, prefix); | |
588 | strcpy(xattr_name + prefixlen, name); | |
589 | ||
b296821a | 590 | res = __hfsplus_getxattr(inode, xattr_name, value, size); |
a3cef4cd FF |
591 | kfree(xattr_name); |
592 | return res; | |
593 | ||
594 | } | |
595 | ||
127e5f5a VD |
596 | static inline int can_list(const char *xattr_name) |
597 | { | |
598 | if (!xattr_name) | |
599 | return 0; | |
600 | ||
601 | return strncmp(xattr_name, XATTR_TRUSTED_PREFIX, | |
602 | XATTR_TRUSTED_PREFIX_LEN) || | |
603 | capable(CAP_SYS_ADMIN); | |
604 | } | |
605 | ||
606 | static ssize_t hfsplus_listxattr_finder_info(struct dentry *dentry, | |
607 | char *buffer, size_t size) | |
608 | { | |
609 | ssize_t res = 0; | |
2b0143b5 | 610 | struct inode *inode = d_inode(dentry); |
127e5f5a VD |
611 | struct hfs_find_data fd; |
612 | u16 entry_type; | |
613 | u8 folder_finder_info[sizeof(struct DInfo) + sizeof(struct DXInfo)]; | |
614 | u8 file_finder_info[sizeof(struct FInfo) + sizeof(struct FXInfo)]; | |
615 | unsigned long len, found_bit; | |
616 | int xattr_name_len, symbols_count; | |
617 | ||
618 | res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd); | |
619 | if (res) { | |
d6142673 | 620 | pr_err("can't init xattr find struct\n"); |
127e5f5a VD |
621 | return res; |
622 | } | |
623 | ||
624 | res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd); | |
625 | if (res) | |
626 | goto end_listxattr_finder_info; | |
627 | ||
628 | entry_type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset); | |
629 | if (entry_type == HFSPLUS_FOLDER) { | |
630 | len = sizeof(struct DInfo) + sizeof(struct DXInfo); | |
631 | hfs_bnode_read(fd.bnode, folder_finder_info, | |
632 | fd.entryoffset + | |
633 | offsetof(struct hfsplus_cat_folder, user_info), | |
634 | len); | |
635 | found_bit = find_first_bit((void *)folder_finder_info, len*8); | |
636 | } else if (entry_type == HFSPLUS_FILE) { | |
637 | len = sizeof(struct FInfo) + sizeof(struct FXInfo); | |
638 | hfs_bnode_read(fd.bnode, file_finder_info, | |
639 | fd.entryoffset + | |
640 | offsetof(struct hfsplus_cat_file, user_info), | |
641 | len); | |
642 | found_bit = find_first_bit((void *)file_finder_info, len*8); | |
643 | } else { | |
644 | res = -EOPNOTSUPP; | |
645 | goto end_listxattr_finder_info; | |
646 | } | |
647 | ||
648 | if (found_bit >= (len*8)) | |
649 | res = 0; | |
650 | else { | |
651 | symbols_count = sizeof(HFSPLUS_XATTR_FINDER_INFO_NAME) - 1; | |
652 | xattr_name_len = | |
653 | name_len(HFSPLUS_XATTR_FINDER_INFO_NAME, symbols_count); | |
654 | if (!buffer || !size) { | |
655 | if (can_list(HFSPLUS_XATTR_FINDER_INFO_NAME)) | |
656 | res = xattr_name_len; | |
657 | } else if (can_list(HFSPLUS_XATTR_FINDER_INFO_NAME)) { | |
658 | if (size < xattr_name_len) | |
659 | res = -ERANGE; | |
660 | else { | |
661 | res = copy_name(buffer, | |
662 | HFSPLUS_XATTR_FINDER_INFO_NAME, | |
663 | symbols_count); | |
664 | } | |
665 | } | |
666 | } | |
667 | ||
668 | end_listxattr_finder_info: | |
669 | hfs_find_exit(&fd); | |
670 | ||
671 | return res; | |
672 | } | |
673 | ||
674 | ssize_t hfsplus_listxattr(struct dentry *dentry, char *buffer, size_t size) | |
675 | { | |
676 | ssize_t err; | |
677 | ssize_t res = 0; | |
2b0143b5 | 678 | struct inode *inode = d_inode(dentry); |
127e5f5a VD |
679 | struct hfs_find_data fd; |
680 | u16 key_len = 0; | |
681 | struct hfsplus_attr_key attr_key; | |
017f8da4 | 682 | char *strbuf; |
127e5f5a VD |
683 | int xattr_name_len; |
684 | ||
685 | if ((!S_ISREG(inode->i_mode) && | |
686 | !S_ISDIR(inode->i_mode)) || | |
687 | HFSPLUS_IS_RSRC(inode)) | |
688 | return -EOPNOTSUPP; | |
689 | ||
690 | res = hfsplus_listxattr_finder_info(dentry, buffer, size); | |
691 | if (res < 0) | |
692 | return res; | |
693 | else if (!HFSPLUS_SB(inode->i_sb)->attr_tree) | |
694 | return (res == 0) ? -EOPNOTSUPP : res; | |
695 | ||
696 | err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->attr_tree, &fd); | |
697 | if (err) { | |
d6142673 | 698 | pr_err("can't init xattr find struct\n"); |
127e5f5a VD |
699 | return err; |
700 | } | |
701 | ||
017f8da4 HTL |
702 | strbuf = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + |
703 | XATTR_MAC_OSX_PREFIX_LEN + 1, GFP_KERNEL); | |
704 | if (!strbuf) { | |
705 | res = -ENOMEM; | |
706 | goto out; | |
707 | } | |
708 | ||
127e5f5a VD |
709 | err = hfsplus_find_attr(inode->i_sb, inode->i_ino, NULL, &fd); |
710 | if (err) { | |
711 | if (err == -ENOENT) { | |
712 | if (res == 0) | |
713 | res = -ENODATA; | |
714 | goto end_listxattr; | |
715 | } else { | |
716 | res = err; | |
717 | goto end_listxattr; | |
718 | } | |
719 | } | |
720 | ||
721 | for (;;) { | |
722 | key_len = hfs_bnode_read_u16(fd.bnode, fd.keyoffset); | |
723 | if (key_len == 0 || key_len > fd.tree->max_key_len) { | |
d6142673 | 724 | pr_err("invalid xattr key length: %d\n", key_len); |
127e5f5a VD |
725 | res = -EIO; |
726 | goto end_listxattr; | |
727 | } | |
728 | ||
729 | hfs_bnode_read(fd.bnode, &attr_key, | |
730 | fd.keyoffset, key_len + sizeof(key_len)); | |
731 | ||
732 | if (be32_to_cpu(attr_key.cnid) != inode->i_ino) | |
733 | goto end_listxattr; | |
734 | ||
017f8da4 | 735 | xattr_name_len = NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN; |
127e5f5a VD |
736 | if (hfsplus_uni2asc(inode->i_sb, |
737 | (const struct hfsplus_unistr *)&fd.key->attr.key_name, | |
738 | strbuf, &xattr_name_len)) { | |
d6142673 | 739 | pr_err("unicode conversion failed\n"); |
127e5f5a VD |
740 | res = -EIO; |
741 | goto end_listxattr; | |
742 | } | |
743 | ||
744 | if (!buffer || !size) { | |
745 | if (can_list(strbuf)) | |
746 | res += name_len(strbuf, xattr_name_len); | |
747 | } else if (can_list(strbuf)) { | |
748 | if (size < (res + name_len(strbuf, xattr_name_len))) { | |
749 | res = -ERANGE; | |
750 | goto end_listxattr; | |
751 | } else | |
752 | res += copy_name(buffer + res, | |
753 | strbuf, xattr_name_len); | |
754 | } | |
755 | ||
756 | if (hfs_brec_goto(&fd, 1)) | |
757 | goto end_listxattr; | |
758 | } | |
759 | ||
760 | end_listxattr: | |
017f8da4 HTL |
761 | kfree(strbuf); |
762 | out: | |
127e5f5a VD |
763 | hfs_find_exit(&fd); |
764 | return res; | |
765 | } | |
766 | ||
b168fff7 | 767 | static int hfsplus_removexattr(struct inode *inode, const char *name) |
127e5f5a VD |
768 | { |
769 | int err = 0; | |
127e5f5a VD |
770 | struct hfs_find_data cat_fd; |
771 | u16 flags; | |
772 | u16 cat_entry_type; | |
773 | int is_xattr_acl_deleted = 0; | |
774 | int is_all_xattrs_deleted = 0; | |
775 | ||
127e5f5a VD |
776 | if (!HFSPLUS_SB(inode->i_sb)->attr_tree) |
777 | return -EOPNOTSUPP; | |
778 | ||
127e5f5a VD |
779 | if (!strcmp_xattr_finder_info(name)) |
780 | return -EOPNOTSUPP; | |
781 | ||
782 | err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &cat_fd); | |
783 | if (err) { | |
d6142673 | 784 | pr_err("can't init xattr find struct\n"); |
127e5f5a VD |
785 | return err; |
786 | } | |
787 | ||
788 | err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &cat_fd); | |
789 | if (err) { | |
d6142673 | 790 | pr_err("catalog searching failed\n"); |
127e5f5a VD |
791 | goto end_removexattr; |
792 | } | |
793 | ||
794 | err = hfsplus_delete_attr(inode, name); | |
795 | if (err) | |
796 | goto end_removexattr; | |
797 | ||
798 | is_xattr_acl_deleted = !strcmp_xattr_acl(name); | |
799 | is_all_xattrs_deleted = !hfsplus_attr_exists(inode, NULL); | |
800 | ||
801 | if (!is_xattr_acl_deleted && !is_all_xattrs_deleted) | |
802 | goto end_removexattr; | |
803 | ||
804 | cat_entry_type = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset); | |
805 | ||
806 | if (cat_entry_type == HFSPLUS_FOLDER) { | |
807 | flags = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset + | |
808 | offsetof(struct hfsplus_cat_folder, flags)); | |
809 | if (is_xattr_acl_deleted) | |
810 | flags &= ~HFSPLUS_ACL_EXISTS; | |
811 | if (is_all_xattrs_deleted) | |
812 | flags &= ~HFSPLUS_XATTR_EXISTS; | |
813 | hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset + | |
814 | offsetof(struct hfsplus_cat_folder, flags), | |
815 | flags); | |
816 | hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY); | |
817 | } else if (cat_entry_type == HFSPLUS_FILE) { | |
818 | flags = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset + | |
819 | offsetof(struct hfsplus_cat_file, flags)); | |
820 | if (is_xattr_acl_deleted) | |
821 | flags &= ~HFSPLUS_ACL_EXISTS; | |
822 | if (is_all_xattrs_deleted) | |
823 | flags &= ~HFSPLUS_XATTR_EXISTS; | |
824 | hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset + | |
825 | offsetof(struct hfsplus_cat_file, flags), | |
826 | flags); | |
827 | hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY); | |
828 | } else { | |
d6142673 | 829 | pr_err("invalid catalog entry type\n"); |
127e5f5a VD |
830 | err = -EIO; |
831 | goto end_removexattr; | |
832 | } | |
833 | ||
834 | end_removexattr: | |
835 | hfs_find_exit(&cat_fd); | |
836 | return err; | |
837 | } | |
838 | ||
d9a82a04 | 839 | static int hfsplus_osx_getxattr(const struct xattr_handler *handler, |
b296821a AV |
840 | struct dentry *unused, struct inode *inode, |
841 | const char *name, void *buffer, size_t size) | |
127e5f5a | 842 | { |
b168fff7 CH |
843 | /* |
844 | * Don't allow retrieving properly prefixed attributes | |
845 | * by prepending them with "osx." | |
846 | */ | |
847 | if (is_known_namespace(name)) | |
848 | return -EOPNOTSUPP; | |
127e5f5a | 849 | |
db579e76 TH |
850 | /* |
851 | * osx is the namespace we use to indicate an unprefixed | |
852 | * attribute on the filesystem (like the ones that OS X | |
853 | * creates), so we pass the name through unmodified (after | |
854 | * ensuring it doesn't conflict with another namespace). | |
855 | */ | |
b296821a | 856 | return __hfsplus_getxattr(inode, name, buffer, size); |
127e5f5a VD |
857 | } |
858 | ||
d9a82a04 | 859 | static int hfsplus_osx_setxattr(const struct xattr_handler *handler, |
e65ce2a5 | 860 | struct user_namespace *mnt_userns, |
59301226 AV |
861 | struct dentry *unused, struct inode *inode, |
862 | const char *name, const void *buffer, | |
863 | size_t size, int flags) | |
127e5f5a | 864 | { |
b168fff7 CH |
865 | /* |
866 | * Don't allow setting properly prefixed attributes | |
867 | * by prepending them with "osx." | |
868 | */ | |
2796e4ce CH |
869 | if (is_known_namespace(name)) |
870 | return -EOPNOTSUPP; | |
871 | ||
db579e76 TH |
872 | /* |
873 | * osx is the namespace we use to indicate an unprefixed | |
874 | * attribute on the filesystem (like the ones that OS X | |
875 | * creates), so we pass the name through unmodified (after | |
876 | * ensuring it doesn't conflict with another namespace). | |
877 | */ | |
59301226 | 878 | return __hfsplus_setxattr(inode, name, buffer, size, flags); |
127e5f5a VD |
879 | } |
880 | ||
127e5f5a VD |
881 | const struct xattr_handler hfsplus_xattr_osx_handler = { |
882 | .prefix = XATTR_MAC_OSX_PREFIX, | |
127e5f5a VD |
883 | .get = hfsplus_osx_getxattr, |
884 | .set = hfsplus_osx_setxattr, | |
885 | }; |