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License cleanup: add SPDX GPL-2.0 license identifier to files with no license
[thirdparty/kernel/linux.git] / fs / hfsplus / xattr.c
1 // SPDX-License-Identifier: GPL-2.0
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"
11 #include <linux/posix_acl_xattr.h>
12 #include <linux/nls.h>
13 #include "xattr.h"
14 #include "acl.h"
15
16 static int hfsplus_removexattr(struct inode *inode, const char *name);
17
18 const struct xattr_handler *hfsplus_xattr_handlers[] = {
19 &hfsplus_xattr_osx_handler,
20 &hfsplus_xattr_user_handler,
21 &hfsplus_xattr_trusted_handler,
22 #ifdef CONFIG_HFSPLUS_FS_POSIX_ACL
23 &posix_acl_access_xattr_handler,
24 &posix_acl_default_xattr_handler,
25 #endif
26 &hfsplus_xattr_security_handler,
27 NULL
28 };
29
30 static int strcmp_xattr_finder_info(const char *name)
31 {
32 if (name) {
33 return strncmp(name, HFSPLUS_XATTR_FINDER_INFO_NAME,
34 sizeof(HFSPLUS_XATTR_FINDER_INFO_NAME));
35 }
36 return -1;
37 }
38
39 static int strcmp_xattr_acl(const char *name)
40 {
41 if (name) {
42 return strncmp(name, HFSPLUS_XATTR_ACL_NAME,
43 sizeof(HFSPLUS_XATTR_ACL_NAME));
44 }
45 return -1;
46 }
47
48 static bool is_known_namespace(const char *name)
49 {
50 if (strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN) &&
51 strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN) &&
52 strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) &&
53 strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN))
54 return false;
55
56 return true;
57 }
58
59 static void hfsplus_init_header_node(struct inode *attr_file,
60 u32 clump_size,
61 char *buf, u16 node_size)
62 {
63 struct hfs_bnode_desc *desc;
64 struct hfs_btree_header_rec *head;
65 u16 offset;
66 __be16 *rec_offsets;
67 u32 hdr_node_map_rec_bits;
68 char *bmp;
69 u32 used_nodes;
70 u32 used_bmp_bytes;
71 u64 tmp;
72
73 hfs_dbg(ATTR_MOD, "init_hdr_attr_file: clump %u, node_size %u\n",
74 clump_size, node_size);
75
76 /* The end of the node contains list of record offsets */
77 rec_offsets = (__be16 *)(buf + node_size);
78
79 desc = (struct hfs_bnode_desc *)buf;
80 desc->type = HFS_NODE_HEADER;
81 desc->num_recs = cpu_to_be16(HFSPLUS_BTREE_HDR_NODE_RECS_COUNT);
82 offset = sizeof(struct hfs_bnode_desc);
83 *--rec_offsets = cpu_to_be16(offset);
84
85 head = (struct hfs_btree_header_rec *)(buf + offset);
86 head->node_size = cpu_to_be16(node_size);
87 tmp = i_size_read(attr_file);
88 do_div(tmp, node_size);
89 head->node_count = cpu_to_be32(tmp);
90 head->free_nodes = cpu_to_be32(be32_to_cpu(head->node_count) - 1);
91 head->clump_size = cpu_to_be32(clump_size);
92 head->attributes |= cpu_to_be32(HFS_TREE_BIGKEYS | HFS_TREE_VARIDXKEYS);
93 head->max_key_len = cpu_to_be16(HFSPLUS_ATTR_KEYLEN - sizeof(u16));
94 offset += sizeof(struct hfs_btree_header_rec);
95 *--rec_offsets = cpu_to_be16(offset);
96 offset += HFSPLUS_BTREE_HDR_USER_BYTES;
97 *--rec_offsets = cpu_to_be16(offset);
98
99 hdr_node_map_rec_bits = 8 * (node_size - offset - (4 * sizeof(u16)));
100 if (be32_to_cpu(head->node_count) > hdr_node_map_rec_bits) {
101 u32 map_node_bits;
102 u32 map_nodes;
103
104 desc->next = cpu_to_be32(be32_to_cpu(head->leaf_tail) + 1);
105 map_node_bits = 8 * (node_size - sizeof(struct hfs_bnode_desc) -
106 (2 * sizeof(u16)) - 2);
107 map_nodes = (be32_to_cpu(head->node_count) -
108 hdr_node_map_rec_bits +
109 (map_node_bits - 1)) / map_node_bits;
110 be32_add_cpu(&head->free_nodes, 0 - map_nodes);
111 }
112
113 bmp = buf + offset;
114 used_nodes =
115 be32_to_cpu(head->node_count) - be32_to_cpu(head->free_nodes);
116 used_bmp_bytes = used_nodes / 8;
117 if (used_bmp_bytes) {
118 memset(bmp, 0xFF, used_bmp_bytes);
119 bmp += used_bmp_bytes;
120 used_nodes %= 8;
121 }
122 *bmp = ~(0xFF >> used_nodes);
123 offset += hdr_node_map_rec_bits / 8;
124 *--rec_offsets = cpu_to_be16(offset);
125 }
126
127 static int hfsplus_create_attributes_file(struct super_block *sb)
128 {
129 int err = 0;
130 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
131 struct inode *attr_file;
132 struct hfsplus_inode_info *hip;
133 u32 clump_size;
134 u16 node_size = HFSPLUS_ATTR_TREE_NODE_SIZE;
135 char *buf;
136 int index, written;
137 struct address_space *mapping;
138 struct page *page;
139 int old_state = HFSPLUS_EMPTY_ATTR_TREE;
140
141 hfs_dbg(ATTR_MOD, "create_attr_file: ino %d\n", HFSPLUS_ATTR_CNID);
142
143 check_attr_tree_state_again:
144 switch (atomic_read(&sbi->attr_tree_state)) {
145 case HFSPLUS_EMPTY_ATTR_TREE:
146 if (old_state != atomic_cmpxchg(&sbi->attr_tree_state,
147 old_state,
148 HFSPLUS_CREATING_ATTR_TREE))
149 goto check_attr_tree_state_again;
150 break;
151 case HFSPLUS_CREATING_ATTR_TREE:
152 /*
153 * This state means that another thread is in process
154 * of AttributesFile creation. Theoretically, it is
155 * possible to be here. But really __setxattr() method
156 * first of all calls hfs_find_init() for lookup in
157 * B-tree of CatalogFile. This method locks mutex of
158 * CatalogFile's B-tree. As a result, if some thread
159 * is inside AttributedFile creation operation then
160 * another threads will be waiting unlocking of
161 * CatalogFile's B-tree's mutex. However, if code will
162 * change then we will return error code (-EAGAIN) from
163 * here. Really, it means that first try to set of xattr
164 * fails with error but second attempt will have success.
165 */
166 return -EAGAIN;
167 case HFSPLUS_VALID_ATTR_TREE:
168 return 0;
169 case HFSPLUS_FAILED_ATTR_TREE:
170 return -EOPNOTSUPP;
171 default:
172 BUG();
173 }
174
175 attr_file = hfsplus_iget(sb, HFSPLUS_ATTR_CNID);
176 if (IS_ERR(attr_file)) {
177 pr_err("failed to load attributes file\n");
178 return PTR_ERR(attr_file);
179 }
180
181 BUG_ON(i_size_read(attr_file) != 0);
182
183 hip = HFSPLUS_I(attr_file);
184
185 clump_size = hfsplus_calc_btree_clump_size(sb->s_blocksize,
186 node_size,
187 sbi->sect_count,
188 HFSPLUS_ATTR_CNID);
189
190 mutex_lock(&hip->extents_lock);
191 hip->clump_blocks = clump_size >> sbi->alloc_blksz_shift;
192 mutex_unlock(&hip->extents_lock);
193
194 if (sbi->free_blocks <= (hip->clump_blocks << 1)) {
195 err = -ENOSPC;
196 goto end_attr_file_creation;
197 }
198
199 while (hip->alloc_blocks < hip->clump_blocks) {
200 err = hfsplus_file_extend(attr_file, false);
201 if (unlikely(err)) {
202 pr_err("failed to extend attributes file\n");
203 goto end_attr_file_creation;
204 }
205 hip->phys_size = attr_file->i_size =
206 (loff_t)hip->alloc_blocks << sbi->alloc_blksz_shift;
207 hip->fs_blocks = hip->alloc_blocks << sbi->fs_shift;
208 inode_set_bytes(attr_file, attr_file->i_size);
209 }
210
211 buf = kzalloc(node_size, GFP_NOFS);
212 if (!buf) {
213 pr_err("failed to allocate memory for header node\n");
214 err = -ENOMEM;
215 goto end_attr_file_creation;
216 }
217
218 hfsplus_init_header_node(attr_file, clump_size, buf, node_size);
219
220 mapping = attr_file->i_mapping;
221
222 index = 0;
223 written = 0;
224 for (; written < node_size; index++, written += PAGE_SIZE) {
225 void *kaddr;
226
227 page = read_mapping_page(mapping, index, NULL);
228 if (IS_ERR(page)) {
229 err = PTR_ERR(page);
230 goto failed_header_node_init;
231 }
232
233 kaddr = kmap_atomic(page);
234 memcpy(kaddr, buf + written,
235 min_t(size_t, PAGE_SIZE, node_size - written));
236 kunmap_atomic(kaddr);
237
238 set_page_dirty(page);
239 put_page(page);
240 }
241
242 hfsplus_mark_inode_dirty(attr_file, HFSPLUS_I_ATTR_DIRTY);
243
244 sbi->attr_tree = hfs_btree_open(sb, HFSPLUS_ATTR_CNID);
245 if (!sbi->attr_tree)
246 pr_err("failed to load attributes file\n");
247
248 failed_header_node_init:
249 kfree(buf);
250
251 end_attr_file_creation:
252 iput(attr_file);
253
254 if (!err)
255 atomic_set(&sbi->attr_tree_state, HFSPLUS_VALID_ATTR_TREE);
256 else if (err == -ENOSPC)
257 atomic_set(&sbi->attr_tree_state, HFSPLUS_EMPTY_ATTR_TREE);
258 else
259 atomic_set(&sbi->attr_tree_state, HFSPLUS_FAILED_ATTR_TREE);
260
261 return err;
262 }
263
264 int __hfsplus_setxattr(struct inode *inode, const char *name,
265 const void *value, size_t size, int flags)
266 {
267 int err = 0;
268 struct hfs_find_data cat_fd;
269 hfsplus_cat_entry entry;
270 u16 cat_entry_flags, cat_entry_type;
271 u16 folder_finderinfo_len = sizeof(struct DInfo) +
272 sizeof(struct DXInfo);
273 u16 file_finderinfo_len = sizeof(struct FInfo) +
274 sizeof(struct FXInfo);
275
276 if ((!S_ISREG(inode->i_mode) &&
277 !S_ISDIR(inode->i_mode)) ||
278 HFSPLUS_IS_RSRC(inode))
279 return -EOPNOTSUPP;
280
281 if (value == NULL)
282 return hfsplus_removexattr(inode, name);
283
284 err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &cat_fd);
285 if (err) {
286 pr_err("can't init xattr find struct\n");
287 return err;
288 }
289
290 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &cat_fd);
291 if (err) {
292 pr_err("catalog searching failed\n");
293 goto end_setxattr;
294 }
295
296 if (!strcmp_xattr_finder_info(name)) {
297 if (flags & XATTR_CREATE) {
298 pr_err("xattr exists yet\n");
299 err = -EOPNOTSUPP;
300 goto end_setxattr;
301 }
302 hfs_bnode_read(cat_fd.bnode, &entry, cat_fd.entryoffset,
303 sizeof(hfsplus_cat_entry));
304 if (be16_to_cpu(entry.type) == HFSPLUS_FOLDER) {
305 if (size == folder_finderinfo_len) {
306 memcpy(&entry.folder.user_info, value,
307 folder_finderinfo_len);
308 hfs_bnode_write(cat_fd.bnode, &entry,
309 cat_fd.entryoffset,
310 sizeof(struct hfsplus_cat_folder));
311 hfsplus_mark_inode_dirty(inode,
312 HFSPLUS_I_CAT_DIRTY);
313 } else {
314 err = -ERANGE;
315 goto end_setxattr;
316 }
317 } else if (be16_to_cpu(entry.type) == HFSPLUS_FILE) {
318 if (size == file_finderinfo_len) {
319 memcpy(&entry.file.user_info, value,
320 file_finderinfo_len);
321 hfs_bnode_write(cat_fd.bnode, &entry,
322 cat_fd.entryoffset,
323 sizeof(struct hfsplus_cat_file));
324 hfsplus_mark_inode_dirty(inode,
325 HFSPLUS_I_CAT_DIRTY);
326 } else {
327 err = -ERANGE;
328 goto end_setxattr;
329 }
330 } else {
331 err = -EOPNOTSUPP;
332 goto end_setxattr;
333 }
334 goto end_setxattr;
335 }
336
337 if (!HFSPLUS_SB(inode->i_sb)->attr_tree) {
338 err = hfsplus_create_attributes_file(inode->i_sb);
339 if (unlikely(err))
340 goto end_setxattr;
341 }
342
343 if (hfsplus_attr_exists(inode, name)) {
344 if (flags & XATTR_CREATE) {
345 pr_err("xattr exists yet\n");
346 err = -EOPNOTSUPP;
347 goto end_setxattr;
348 }
349 err = hfsplus_delete_attr(inode, name);
350 if (err)
351 goto end_setxattr;
352 err = hfsplus_create_attr(inode, name, value, size);
353 if (err)
354 goto end_setxattr;
355 } else {
356 if (flags & XATTR_REPLACE) {
357 pr_err("cannot replace xattr\n");
358 err = -EOPNOTSUPP;
359 goto end_setxattr;
360 }
361 err = hfsplus_create_attr(inode, name, value, size);
362 if (err)
363 goto end_setxattr;
364 }
365
366 cat_entry_type = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset);
367 if (cat_entry_type == HFSPLUS_FOLDER) {
368 cat_entry_flags = hfs_bnode_read_u16(cat_fd.bnode,
369 cat_fd.entryoffset +
370 offsetof(struct hfsplus_cat_folder, flags));
371 cat_entry_flags |= HFSPLUS_XATTR_EXISTS;
372 if (!strcmp_xattr_acl(name))
373 cat_entry_flags |= HFSPLUS_ACL_EXISTS;
374 hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset +
375 offsetof(struct hfsplus_cat_folder, flags),
376 cat_entry_flags);
377 hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY);
378 } else if (cat_entry_type == HFSPLUS_FILE) {
379 cat_entry_flags = hfs_bnode_read_u16(cat_fd.bnode,
380 cat_fd.entryoffset +
381 offsetof(struct hfsplus_cat_file, flags));
382 cat_entry_flags |= HFSPLUS_XATTR_EXISTS;
383 if (!strcmp_xattr_acl(name))
384 cat_entry_flags |= HFSPLUS_ACL_EXISTS;
385 hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset +
386 offsetof(struct hfsplus_cat_file, flags),
387 cat_entry_flags);
388 hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY);
389 } else {
390 pr_err("invalid catalog entry type\n");
391 err = -EIO;
392 goto end_setxattr;
393 }
394
395 end_setxattr:
396 hfs_find_exit(&cat_fd);
397 return err;
398 }
399
400 static int name_len(const char *xattr_name, int xattr_name_len)
401 {
402 int len = xattr_name_len + 1;
403
404 if (!is_known_namespace(xattr_name))
405 len += XATTR_MAC_OSX_PREFIX_LEN;
406
407 return len;
408 }
409
410 static int copy_name(char *buffer, const char *xattr_name, int name_len)
411 {
412 int len = name_len;
413 int offset = 0;
414
415 if (!is_known_namespace(xattr_name)) {
416 strncpy(buffer, XATTR_MAC_OSX_PREFIX, XATTR_MAC_OSX_PREFIX_LEN);
417 offset += XATTR_MAC_OSX_PREFIX_LEN;
418 len += XATTR_MAC_OSX_PREFIX_LEN;
419 }
420
421 strncpy(buffer + offset, xattr_name, name_len);
422 memset(buffer + offset + name_len, 0, 1);
423 len += 1;
424
425 return len;
426 }
427
428 int hfsplus_setxattr(struct inode *inode, const char *name,
429 const void *value, size_t size, int flags,
430 const char *prefix, size_t prefixlen)
431 {
432 char *xattr_name;
433 int res;
434
435 xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
436 GFP_KERNEL);
437 if (!xattr_name)
438 return -ENOMEM;
439 strcpy(xattr_name, prefix);
440 strcpy(xattr_name + prefixlen, name);
441 res = __hfsplus_setxattr(inode, xattr_name, value, size, flags);
442 kfree(xattr_name);
443 return res;
444 }
445
446 static ssize_t hfsplus_getxattr_finder_info(struct inode *inode,
447 void *value, size_t size)
448 {
449 ssize_t res = 0;
450 struct hfs_find_data fd;
451 u16 entry_type;
452 u16 folder_rec_len = sizeof(struct DInfo) + sizeof(struct DXInfo);
453 u16 file_rec_len = sizeof(struct FInfo) + sizeof(struct FXInfo);
454 u16 record_len = max(folder_rec_len, file_rec_len);
455 u8 folder_finder_info[sizeof(struct DInfo) + sizeof(struct DXInfo)];
456 u8 file_finder_info[sizeof(struct FInfo) + sizeof(struct FXInfo)];
457
458 if (size >= record_len) {
459 res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
460 if (res) {
461 pr_err("can't init xattr find struct\n");
462 return res;
463 }
464 res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
465 if (res)
466 goto end_getxattr_finder_info;
467 entry_type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset);
468
469 if (entry_type == HFSPLUS_FOLDER) {
470 hfs_bnode_read(fd.bnode, folder_finder_info,
471 fd.entryoffset +
472 offsetof(struct hfsplus_cat_folder, user_info),
473 folder_rec_len);
474 memcpy(value, folder_finder_info, folder_rec_len);
475 res = folder_rec_len;
476 } else if (entry_type == HFSPLUS_FILE) {
477 hfs_bnode_read(fd.bnode, file_finder_info,
478 fd.entryoffset +
479 offsetof(struct hfsplus_cat_file, user_info),
480 file_rec_len);
481 memcpy(value, file_finder_info, file_rec_len);
482 res = file_rec_len;
483 } else {
484 res = -EOPNOTSUPP;
485 goto end_getxattr_finder_info;
486 }
487 } else
488 res = size ? -ERANGE : record_len;
489
490 end_getxattr_finder_info:
491 if (size >= record_len)
492 hfs_find_exit(&fd);
493 return res;
494 }
495
496 ssize_t __hfsplus_getxattr(struct inode *inode, const char *name,
497 void *value, size_t size)
498 {
499 struct hfs_find_data fd;
500 hfsplus_attr_entry *entry;
501 __be32 xattr_record_type;
502 u32 record_type;
503 u16 record_length = 0;
504 ssize_t res = 0;
505
506 if ((!S_ISREG(inode->i_mode) &&
507 !S_ISDIR(inode->i_mode)) ||
508 HFSPLUS_IS_RSRC(inode))
509 return -EOPNOTSUPP;
510
511 if (!strcmp_xattr_finder_info(name))
512 return hfsplus_getxattr_finder_info(inode, value, size);
513
514 if (!HFSPLUS_SB(inode->i_sb)->attr_tree)
515 return -EOPNOTSUPP;
516
517 entry = hfsplus_alloc_attr_entry();
518 if (!entry) {
519 pr_err("can't allocate xattr entry\n");
520 return -ENOMEM;
521 }
522
523 res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->attr_tree, &fd);
524 if (res) {
525 pr_err("can't init xattr find struct\n");
526 goto failed_getxattr_init;
527 }
528
529 res = hfsplus_find_attr(inode->i_sb, inode->i_ino, name, &fd);
530 if (res) {
531 if (res == -ENOENT)
532 res = -ENODATA;
533 else
534 pr_err("xattr searching failed\n");
535 goto out;
536 }
537
538 hfs_bnode_read(fd.bnode, &xattr_record_type,
539 fd.entryoffset, sizeof(xattr_record_type));
540 record_type = be32_to_cpu(xattr_record_type);
541 if (record_type == HFSPLUS_ATTR_INLINE_DATA) {
542 record_length = hfs_bnode_read_u16(fd.bnode,
543 fd.entryoffset +
544 offsetof(struct hfsplus_attr_inline_data,
545 length));
546 if (record_length > HFSPLUS_MAX_INLINE_DATA_SIZE) {
547 pr_err("invalid xattr record size\n");
548 res = -EIO;
549 goto out;
550 }
551 } else if (record_type == HFSPLUS_ATTR_FORK_DATA ||
552 record_type == HFSPLUS_ATTR_EXTENTS) {
553 pr_err("only inline data xattr are supported\n");
554 res = -EOPNOTSUPP;
555 goto out;
556 } else {
557 pr_err("invalid xattr record\n");
558 res = -EIO;
559 goto out;
560 }
561
562 if (size) {
563 hfs_bnode_read(fd.bnode, entry, fd.entryoffset,
564 offsetof(struct hfsplus_attr_inline_data,
565 raw_bytes) + record_length);
566 }
567
568 if (size >= record_length) {
569 memcpy(value, entry->inline_data.raw_bytes, record_length);
570 res = record_length;
571 } else
572 res = size ? -ERANGE : record_length;
573
574 out:
575 hfs_find_exit(&fd);
576
577 failed_getxattr_init:
578 hfsplus_destroy_attr_entry(entry);
579 return res;
580 }
581
582 ssize_t hfsplus_getxattr(struct inode *inode, const char *name,
583 void *value, size_t size,
584 const char *prefix, size_t prefixlen)
585 {
586 int res;
587 char *xattr_name;
588
589 xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
590 GFP_KERNEL);
591 if (!xattr_name)
592 return -ENOMEM;
593
594 strcpy(xattr_name, prefix);
595 strcpy(xattr_name + prefixlen, name);
596
597 res = __hfsplus_getxattr(inode, xattr_name, value, size);
598 kfree(xattr_name);
599 return res;
600
601 }
602
603 static inline int can_list(const char *xattr_name)
604 {
605 if (!xattr_name)
606 return 0;
607
608 return strncmp(xattr_name, XATTR_TRUSTED_PREFIX,
609 XATTR_TRUSTED_PREFIX_LEN) ||
610 capable(CAP_SYS_ADMIN);
611 }
612
613 static ssize_t hfsplus_listxattr_finder_info(struct dentry *dentry,
614 char *buffer, size_t size)
615 {
616 ssize_t res = 0;
617 struct inode *inode = d_inode(dentry);
618 struct hfs_find_data fd;
619 u16 entry_type;
620 u8 folder_finder_info[sizeof(struct DInfo) + sizeof(struct DXInfo)];
621 u8 file_finder_info[sizeof(struct FInfo) + sizeof(struct FXInfo)];
622 unsigned long len, found_bit;
623 int xattr_name_len, symbols_count;
624
625 res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
626 if (res) {
627 pr_err("can't init xattr find struct\n");
628 return res;
629 }
630
631 res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
632 if (res)
633 goto end_listxattr_finder_info;
634
635 entry_type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset);
636 if (entry_type == HFSPLUS_FOLDER) {
637 len = sizeof(struct DInfo) + sizeof(struct DXInfo);
638 hfs_bnode_read(fd.bnode, folder_finder_info,
639 fd.entryoffset +
640 offsetof(struct hfsplus_cat_folder, user_info),
641 len);
642 found_bit = find_first_bit((void *)folder_finder_info, len*8);
643 } else if (entry_type == HFSPLUS_FILE) {
644 len = sizeof(struct FInfo) + sizeof(struct FXInfo);
645 hfs_bnode_read(fd.bnode, file_finder_info,
646 fd.entryoffset +
647 offsetof(struct hfsplus_cat_file, user_info),
648 len);
649 found_bit = find_first_bit((void *)file_finder_info, len*8);
650 } else {
651 res = -EOPNOTSUPP;
652 goto end_listxattr_finder_info;
653 }
654
655 if (found_bit >= (len*8))
656 res = 0;
657 else {
658 symbols_count = sizeof(HFSPLUS_XATTR_FINDER_INFO_NAME) - 1;
659 xattr_name_len =
660 name_len(HFSPLUS_XATTR_FINDER_INFO_NAME, symbols_count);
661 if (!buffer || !size) {
662 if (can_list(HFSPLUS_XATTR_FINDER_INFO_NAME))
663 res = xattr_name_len;
664 } else if (can_list(HFSPLUS_XATTR_FINDER_INFO_NAME)) {
665 if (size < xattr_name_len)
666 res = -ERANGE;
667 else {
668 res = copy_name(buffer,
669 HFSPLUS_XATTR_FINDER_INFO_NAME,
670 symbols_count);
671 }
672 }
673 }
674
675 end_listxattr_finder_info:
676 hfs_find_exit(&fd);
677
678 return res;
679 }
680
681 ssize_t hfsplus_listxattr(struct dentry *dentry, char *buffer, size_t size)
682 {
683 ssize_t err;
684 ssize_t res = 0;
685 struct inode *inode = d_inode(dentry);
686 struct hfs_find_data fd;
687 u16 key_len = 0;
688 struct hfsplus_attr_key attr_key;
689 char *strbuf;
690 int xattr_name_len;
691
692 if ((!S_ISREG(inode->i_mode) &&
693 !S_ISDIR(inode->i_mode)) ||
694 HFSPLUS_IS_RSRC(inode))
695 return -EOPNOTSUPP;
696
697 res = hfsplus_listxattr_finder_info(dentry, buffer, size);
698 if (res < 0)
699 return res;
700 else if (!HFSPLUS_SB(inode->i_sb)->attr_tree)
701 return (res == 0) ? -EOPNOTSUPP : res;
702
703 err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->attr_tree, &fd);
704 if (err) {
705 pr_err("can't init xattr find struct\n");
706 return err;
707 }
708
709 strbuf = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN +
710 XATTR_MAC_OSX_PREFIX_LEN + 1, GFP_KERNEL);
711 if (!strbuf) {
712 res = -ENOMEM;
713 goto out;
714 }
715
716 err = hfsplus_find_attr(inode->i_sb, inode->i_ino, NULL, &fd);
717 if (err) {
718 if (err == -ENOENT) {
719 if (res == 0)
720 res = -ENODATA;
721 goto end_listxattr;
722 } else {
723 res = err;
724 goto end_listxattr;
725 }
726 }
727
728 for (;;) {
729 key_len = hfs_bnode_read_u16(fd.bnode, fd.keyoffset);
730 if (key_len == 0 || key_len > fd.tree->max_key_len) {
731 pr_err("invalid xattr key length: %d\n", key_len);
732 res = -EIO;
733 goto end_listxattr;
734 }
735
736 hfs_bnode_read(fd.bnode, &attr_key,
737 fd.keyoffset, key_len + sizeof(key_len));
738
739 if (be32_to_cpu(attr_key.cnid) != inode->i_ino)
740 goto end_listxattr;
741
742 xattr_name_len = NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN;
743 if (hfsplus_uni2asc(inode->i_sb,
744 (const struct hfsplus_unistr *)&fd.key->attr.key_name,
745 strbuf, &xattr_name_len)) {
746 pr_err("unicode conversion failed\n");
747 res = -EIO;
748 goto end_listxattr;
749 }
750
751 if (!buffer || !size) {
752 if (can_list(strbuf))
753 res += name_len(strbuf, xattr_name_len);
754 } else if (can_list(strbuf)) {
755 if (size < (res + name_len(strbuf, xattr_name_len))) {
756 res = -ERANGE;
757 goto end_listxattr;
758 } else
759 res += copy_name(buffer + res,
760 strbuf, xattr_name_len);
761 }
762
763 if (hfs_brec_goto(&fd, 1))
764 goto end_listxattr;
765 }
766
767 end_listxattr:
768 kfree(strbuf);
769 out:
770 hfs_find_exit(&fd);
771 return res;
772 }
773
774 static int hfsplus_removexattr(struct inode *inode, const char *name)
775 {
776 int err = 0;
777 struct hfs_find_data cat_fd;
778 u16 flags;
779 u16 cat_entry_type;
780 int is_xattr_acl_deleted = 0;
781 int is_all_xattrs_deleted = 0;
782
783 if (!HFSPLUS_SB(inode->i_sb)->attr_tree)
784 return -EOPNOTSUPP;
785
786 if (!strcmp_xattr_finder_info(name))
787 return -EOPNOTSUPP;
788
789 err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &cat_fd);
790 if (err) {
791 pr_err("can't init xattr find struct\n");
792 return err;
793 }
794
795 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &cat_fd);
796 if (err) {
797 pr_err("catalog searching failed\n");
798 goto end_removexattr;
799 }
800
801 err = hfsplus_delete_attr(inode, name);
802 if (err)
803 goto end_removexattr;
804
805 is_xattr_acl_deleted = !strcmp_xattr_acl(name);
806 is_all_xattrs_deleted = !hfsplus_attr_exists(inode, NULL);
807
808 if (!is_xattr_acl_deleted && !is_all_xattrs_deleted)
809 goto end_removexattr;
810
811 cat_entry_type = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset);
812
813 if (cat_entry_type == HFSPLUS_FOLDER) {
814 flags = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset +
815 offsetof(struct hfsplus_cat_folder, flags));
816 if (is_xattr_acl_deleted)
817 flags &= ~HFSPLUS_ACL_EXISTS;
818 if (is_all_xattrs_deleted)
819 flags &= ~HFSPLUS_XATTR_EXISTS;
820 hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset +
821 offsetof(struct hfsplus_cat_folder, flags),
822 flags);
823 hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY);
824 } else if (cat_entry_type == HFSPLUS_FILE) {
825 flags = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset +
826 offsetof(struct hfsplus_cat_file, flags));
827 if (is_xattr_acl_deleted)
828 flags &= ~HFSPLUS_ACL_EXISTS;
829 if (is_all_xattrs_deleted)
830 flags &= ~HFSPLUS_XATTR_EXISTS;
831 hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset +
832 offsetof(struct hfsplus_cat_file, flags),
833 flags);
834 hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY);
835 } else {
836 pr_err("invalid catalog entry type\n");
837 err = -EIO;
838 goto end_removexattr;
839 }
840
841 end_removexattr:
842 hfs_find_exit(&cat_fd);
843 return err;
844 }
845
846 static int hfsplus_osx_getxattr(const struct xattr_handler *handler,
847 struct dentry *unused, struct inode *inode,
848 const char *name, void *buffer, size_t size)
849 {
850 /*
851 * Don't allow retrieving properly prefixed attributes
852 * by prepending them with "osx."
853 */
854 if (is_known_namespace(name))
855 return -EOPNOTSUPP;
856
857 /*
858 * osx is the namespace we use to indicate an unprefixed
859 * attribute on the filesystem (like the ones that OS X
860 * creates), so we pass the name through unmodified (after
861 * ensuring it doesn't conflict with another namespace).
862 */
863 return __hfsplus_getxattr(inode, name, buffer, size);
864 }
865
866 static int hfsplus_osx_setxattr(const struct xattr_handler *handler,
867 struct dentry *unused, struct inode *inode,
868 const char *name, const void *buffer,
869 size_t size, int flags)
870 {
871 /*
872 * Don't allow setting properly prefixed attributes
873 * by prepending them with "osx."
874 */
875 if (is_known_namespace(name))
876 return -EOPNOTSUPP;
877
878 /*
879 * osx is the namespace we use to indicate an unprefixed
880 * attribute on the filesystem (like the ones that OS X
881 * creates), so we pass the name through unmodified (after
882 * ensuring it doesn't conflict with another namespace).
883 */
884 return __hfsplus_setxattr(inode, name, buffer, size, flags);
885 }
886
887 const struct xattr_handler hfsplus_xattr_osx_handler = {
888 .prefix = XATTR_MAC_OSX_PREFIX,
889 .get = hfsplus_osx_getxattr,
890 .set = hfsplus_osx_setxattr,
891 };
A mirror of Linus' kernel repository