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powerpc/perf/hv-24x7: Simplify extracting counter from result buffer
[linux-2.6/btrfs-unstable.git] / fs / hfsplus / xattr.c
blob416b1dbafe516583b22efad4a851e7f6cf2abb25
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 <linux/posix_acl_xattr.h>
11 #include <linux/nls.h>
12 #include "xattr.h"
13 #include "acl.h"
14
15 static int hfsplus_removexattr(struct inode *inode, const char *name);
16
17 const struct xattr_handler *hfsplus_xattr_handlers[] = {
18 &hfsplus_xattr_osx_handler,
19 &hfsplus_xattr_user_handler,
20 &hfsplus_xattr_trusted_handler,
21 #ifdef CONFIG_HFSPLUS_FS_POSIX_ACL
22 &posix_acl_access_xattr_handler,
23 &posix_acl_default_xattr_handler,
24 #endif
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
47 static bool is_known_namespace(const char *name)
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
58 static void hfsplus_init_header_node(struct inode *attr_file,
59 u32 clump_size,
60 char *buf, u16 node_size)
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;
70 u64 tmp;
71
72 hfs_dbg(ATTR_MOD, "init_hdr_attr_file: clump %u, node_size %u\n",
73 clump_size, node_size);
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);
86 tmp = i_size_read(attr_file);
87 do_div(tmp, node_size);
88 head->node_count = cpu_to_be32(tmp);
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
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) {
199 err = hfsplus_file_extend(attr_file, false);
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
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
280 if (value == NULL)
281 return hfsplus_removexattr(inode, name);
282
283 err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &cat_fd);
284 if (err) {
285 pr_err("can't init xattr find struct\n");
286 return err;
287 }
288
289 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &cat_fd);
290 if (err) {
291 pr_err("catalog searching failed\n");
292 goto end_setxattr;
293 }
294
295 if (!strcmp_xattr_finder_info(name)) {
296 if (flags & XATTR_CREATE) {
297 pr_err("xattr exists yet\n");
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) {
337 err = hfsplus_create_attributes_file(inode->i_sb);
338 if (unlikely(err))
339 goto end_setxattr;
340 }
341
342 if (hfsplus_attr_exists(inode, name)) {
343 if (flags & XATTR_CREATE) {
344 pr_err("xattr exists yet\n");
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) {
356 pr_err("cannot replace xattr\n");
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 {
389 pr_err("invalid catalog entry type\n");
390 err = -EIO;
391 goto end_setxattr;
392 }
393
394 end_setxattr:
395 hfs_find_exit(&cat_fd);
396 return err;
397 }
398
399 static int name_len(const char *xattr_name, int xattr_name_len)
400 {
401 int len = xattr_name_len + 1;
402
403 if (!is_known_namespace(xattr_name))
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
414 if (!is_known_namespace(xattr_name)) {
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
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);
443 res = __hfsplus_setxattr(d_inode(dentry), xattr_name, value, size,
444 flags);
445 kfree(xattr_name);
446 return res;
447 }
448
449 static ssize_t hfsplus_getxattr_finder_info(struct inode *inode,
450 void *value, size_t size)
451 {
452 ssize_t res = 0;
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) {
464 pr_err("can't init xattr find struct\n");
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
499 ssize_t __hfsplus_getxattr(struct inode *inode, const char *name,
500 void *value, size_t size)
501 {
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
514 if (!strcmp_xattr_finder_info(name))
515 return hfsplus_getxattr_finder_info(inode, value, size);
516
517 if (!HFSPLUS_SB(inode->i_sb)->attr_tree)
518 return -EOPNOTSUPP;
519
520 entry = hfsplus_alloc_attr_entry();
521 if (!entry) {
522 pr_err("can't allocate xattr entry\n");
523 return -ENOMEM;
524 }
525
526 res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->attr_tree, &fd);
527 if (res) {
528 pr_err("can't init xattr find struct\n");
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
537 pr_err("xattr searching failed\n");
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) {
550 pr_err("invalid xattr record size\n");
551 res = -EIO;
552 goto out;
553 }
554 } else if (record_type == HFSPLUS_ATTR_FORK_DATA ||
555 record_type == HFSPLUS_ATTR_EXTENTS) {
556 pr_err("only inline data xattr are supported\n");
557 res = -EOPNOTSUPP;
558 goto out;
559 } else {
560 pr_err("invalid xattr record\n");
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
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
603 res = __hfsplus_getxattr(d_inode(dentry), xattr_name, value, size);
604 kfree(xattr_name);
605 return res;
606
607 }
608
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;
623 struct inode *inode = d_inode(dentry);
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) {
633 pr_err("can't init xattr find struct\n");
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;
691 struct inode *inode = d_inode(dentry);
692 struct hfs_find_data fd;
693 u16 key_len = 0;
694 struct hfsplus_attr_key attr_key;
695 char *strbuf;
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) {
711 pr_err("can't init xattr find struct\n");
712 return err;
713 }
714
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
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) {
737 pr_err("invalid xattr key length: %d\n", key_len);
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
748 xattr_name_len = NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN;
749 if (hfsplus_uni2asc(inode->i_sb,
750 (const struct hfsplus_unistr *)&fd.key->attr.key_name,
751 strbuf, &xattr_name_len)) {
752 pr_err("unicode conversion failed\n");
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:
774 kfree(strbuf);
775 out:
776 hfs_find_exit(&fd);
777 return res;
778 }
779
780 static int hfsplus_removexattr(struct inode *inode, const char *name)
781 {
782 int err = 0;
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
789 if (!HFSPLUS_SB(inode->i_sb)->attr_tree)
790 return -EOPNOTSUPP;
791
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) {
797 pr_err("can't init xattr find struct\n");
798 return err;
799 }
800
801 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &cat_fd);
802 if (err) {
803 pr_err("catalog searching failed\n");
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 {
842 pr_err("invalid catalog entry type\n");
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 {
855 if (!strcmp(name, ""))
856 return -EINVAL;
857
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;
864
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 */
871 return __hfsplus_getxattr(d_inode(dentry), name, buffer, size);
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 {
877 if (!strcmp(name, ""))
878 return -EINVAL;
879
880 /*
881 * Don't allow setting properly prefixed attributes
882 * by prepending them with "osx."
883 */
884 if (is_known_namespace(name))
885 return -EOPNOTSUPP;
886
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 */
893 return __hfsplus_setxattr(d_inode(dentry), name, buffer, size, flags);
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 };
(deprecated) Btrfs devel tree