Commit | Line | Data |
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0a8165d7 | 1 | /* |
af48b85b JK |
2 | * fs/f2fs/xattr.c |
3 | * | |
4 | * Copyright (c) 2012 Samsung Electronics Co., Ltd. | |
5 | * http://www.samsung.com/ | |
6 | * | |
7 | * Portions of this code from linux/fs/ext2/xattr.c | |
8 | * | |
9 | * Copyright (C) 2001-2003 Andreas Gruenbacher <agruen@suse.de> | |
10 | * | |
11 | * Fix by Harrison Xing <harrison@mountainviewdata.com>. | |
12 | * Extended attributes for symlinks and special files added per | |
13 | * suggestion of Luka Renko <luka.renko@hermes.si>. | |
14 | * xattr consolidation Copyright (c) 2004 James Morris <jmorris@redhat.com>, | |
15 | * Red Hat Inc. | |
16 | * | |
17 | * This program is free software; you can redistribute it and/or modify | |
18 | * it under the terms of the GNU General Public License version 2 as | |
19 | * published by the Free Software Foundation. | |
20 | */ | |
21 | #include <linux/rwsem.h> | |
22 | #include <linux/f2fs_fs.h> | |
23 | #include "f2fs.h" | |
24 | #include "xattr.h" | |
25 | ||
26 | static size_t f2fs_xattr_generic_list(struct dentry *dentry, char *list, | |
27 | size_t list_size, const char *name, size_t name_len, int type) | |
28 | { | |
29 | struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb); | |
30 | int total_len, prefix_len = 0; | |
31 | const char *prefix = NULL; | |
32 | ||
33 | switch (type) { | |
34 | case F2FS_XATTR_INDEX_USER: | |
35 | if (!test_opt(sbi, XATTR_USER)) | |
36 | return -EOPNOTSUPP; | |
37 | prefix = XATTR_USER_PREFIX; | |
38 | prefix_len = XATTR_USER_PREFIX_LEN; | |
39 | break; | |
40 | case F2FS_XATTR_INDEX_TRUSTED: | |
41 | if (!capable(CAP_SYS_ADMIN)) | |
42 | return -EPERM; | |
43 | prefix = XATTR_TRUSTED_PREFIX; | |
44 | prefix_len = XATTR_TRUSTED_PREFIX_LEN; | |
45 | break; | |
46 | default: | |
47 | return -EINVAL; | |
48 | } | |
49 | ||
50 | total_len = prefix_len + name_len + 1; | |
51 | if (list && total_len <= list_size) { | |
52 | memcpy(list, prefix, prefix_len); | |
53 | memcpy(list+prefix_len, name, name_len); | |
54 | list[prefix_len + name_len] = '\0'; | |
55 | } | |
56 | return total_len; | |
57 | } | |
58 | ||
59 | static int f2fs_xattr_generic_get(struct dentry *dentry, const char *name, | |
60 | void *buffer, size_t size, int type) | |
61 | { | |
62 | struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb); | |
63 | ||
64 | switch (type) { | |
65 | case F2FS_XATTR_INDEX_USER: | |
66 | if (!test_opt(sbi, XATTR_USER)) | |
67 | return -EOPNOTSUPP; | |
68 | break; | |
69 | case F2FS_XATTR_INDEX_TRUSTED: | |
70 | if (!capable(CAP_SYS_ADMIN)) | |
71 | return -EPERM; | |
72 | break; | |
73 | default: | |
74 | return -EINVAL; | |
75 | } | |
76 | if (strcmp(name, "") == 0) | |
77 | return -EINVAL; | |
78 | return f2fs_getxattr(dentry->d_inode, type, name, | |
79 | buffer, size); | |
80 | } | |
81 | ||
82 | static int f2fs_xattr_generic_set(struct dentry *dentry, const char *name, | |
83 | const void *value, size_t size, int flags, int type) | |
84 | { | |
85 | struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb); | |
86 | ||
87 | switch (type) { | |
88 | case F2FS_XATTR_INDEX_USER: | |
89 | if (!test_opt(sbi, XATTR_USER)) | |
90 | return -EOPNOTSUPP; | |
91 | break; | |
92 | case F2FS_XATTR_INDEX_TRUSTED: | |
93 | if (!capable(CAP_SYS_ADMIN)) | |
94 | return -EPERM; | |
95 | break; | |
96 | default: | |
97 | return -EINVAL; | |
98 | } | |
99 | if (strcmp(name, "") == 0) | |
100 | return -EINVAL; | |
101 | ||
102 | return f2fs_setxattr(dentry->d_inode, type, name, value, size); | |
103 | } | |
104 | ||
573ea5fc JK |
105 | static size_t f2fs_xattr_advise_list(struct dentry *dentry, char *list, |
106 | size_t list_size, const char *name, size_t name_len, int type) | |
107 | { | |
108 | const char *xname = F2FS_SYSTEM_ADVISE_PREFIX; | |
109 | size_t size; | |
110 | ||
111 | if (type != F2FS_XATTR_INDEX_ADVISE) | |
112 | return 0; | |
113 | ||
114 | size = strlen(xname) + 1; | |
115 | if (list && size <= list_size) | |
116 | memcpy(list, xname, size); | |
117 | return size; | |
118 | } | |
119 | ||
120 | static int f2fs_xattr_advise_get(struct dentry *dentry, const char *name, | |
121 | void *buffer, size_t size, int type) | |
122 | { | |
123 | struct inode *inode = dentry->d_inode; | |
124 | ||
125 | if (strcmp(name, "") != 0) | |
126 | return -EINVAL; | |
127 | ||
128 | *((char *)buffer) = F2FS_I(inode)->i_advise; | |
129 | return sizeof(char); | |
130 | } | |
131 | ||
132 | static int f2fs_xattr_advise_set(struct dentry *dentry, const char *name, | |
133 | const void *value, size_t size, int flags, int type) | |
134 | { | |
135 | struct inode *inode = dentry->d_inode; | |
136 | ||
137 | if (strcmp(name, "") != 0) | |
138 | return -EINVAL; | |
139 | if (!inode_owner_or_capable(inode)) | |
140 | return -EPERM; | |
141 | if (value == NULL) | |
142 | return -EINVAL; | |
143 | ||
144 | F2FS_I(inode)->i_advise |= *(char *)value; | |
145 | return 0; | |
146 | } | |
147 | ||
af48b85b JK |
148 | const struct xattr_handler f2fs_xattr_user_handler = { |
149 | .prefix = XATTR_USER_PREFIX, | |
150 | .flags = F2FS_XATTR_INDEX_USER, | |
151 | .list = f2fs_xattr_generic_list, | |
152 | .get = f2fs_xattr_generic_get, | |
153 | .set = f2fs_xattr_generic_set, | |
154 | }; | |
155 | ||
156 | const struct xattr_handler f2fs_xattr_trusted_handler = { | |
157 | .prefix = XATTR_TRUSTED_PREFIX, | |
158 | .flags = F2FS_XATTR_INDEX_TRUSTED, | |
159 | .list = f2fs_xattr_generic_list, | |
160 | .get = f2fs_xattr_generic_get, | |
161 | .set = f2fs_xattr_generic_set, | |
162 | }; | |
163 | ||
573ea5fc JK |
164 | const struct xattr_handler f2fs_xattr_advise_handler = { |
165 | .prefix = F2FS_SYSTEM_ADVISE_PREFIX, | |
166 | .flags = F2FS_XATTR_INDEX_ADVISE, | |
167 | .list = f2fs_xattr_advise_list, | |
168 | .get = f2fs_xattr_advise_get, | |
169 | .set = f2fs_xattr_advise_set, | |
170 | }; | |
171 | ||
af48b85b JK |
172 | static const struct xattr_handler *f2fs_xattr_handler_map[] = { |
173 | [F2FS_XATTR_INDEX_USER] = &f2fs_xattr_user_handler, | |
174 | #ifdef CONFIG_F2FS_FS_POSIX_ACL | |
175 | [F2FS_XATTR_INDEX_POSIX_ACL_ACCESS] = &f2fs_xattr_acl_access_handler, | |
176 | [F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT] = &f2fs_xattr_acl_default_handler, | |
177 | #endif | |
178 | [F2FS_XATTR_INDEX_TRUSTED] = &f2fs_xattr_trusted_handler, | |
179 | [F2FS_XATTR_INDEX_ADVISE] = &f2fs_xattr_advise_handler, | |
180 | }; | |
181 | ||
182 | const struct xattr_handler *f2fs_xattr_handlers[] = { | |
183 | &f2fs_xattr_user_handler, | |
184 | #ifdef CONFIG_F2FS_FS_POSIX_ACL | |
185 | &f2fs_xattr_acl_access_handler, | |
186 | &f2fs_xattr_acl_default_handler, | |
187 | #endif | |
188 | &f2fs_xattr_trusted_handler, | |
189 | &f2fs_xattr_advise_handler, | |
190 | NULL, | |
191 | }; | |
192 | ||
193 | static inline const struct xattr_handler *f2fs_xattr_handler(int name_index) | |
194 | { | |
195 | const struct xattr_handler *handler = NULL; | |
196 | ||
197 | if (name_index > 0 && name_index < ARRAY_SIZE(f2fs_xattr_handler_map)) | |
198 | handler = f2fs_xattr_handler_map[name_index]; | |
199 | return handler; | |
200 | } | |
201 | ||
202 | int f2fs_getxattr(struct inode *inode, int name_index, const char *name, | |
203 | void *buffer, size_t buffer_size) | |
204 | { | |
205 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
206 | struct f2fs_inode_info *fi = F2FS_I(inode); | |
207 | struct f2fs_xattr_entry *entry; | |
208 | struct page *page; | |
209 | void *base_addr; | |
210 | int error = 0, found = 0; | |
9836b8b9 | 211 | size_t value_len, name_len; |
af48b85b JK |
212 | |
213 | if (name == NULL) | |
214 | return -EINVAL; | |
215 | name_len = strlen(name); | |
216 | ||
217 | if (!fi->i_xattr_nid) | |
218 | return -ENODATA; | |
219 | ||
220 | page = get_node_page(sbi, fi->i_xattr_nid); | |
221 | base_addr = page_address(page); | |
222 | ||
223 | list_for_each_xattr(entry, base_addr) { | |
224 | if (entry->e_name_index != name_index) | |
225 | continue; | |
226 | if (entry->e_name_len != name_len) | |
227 | continue; | |
228 | if (!memcmp(entry->e_name, name, name_len)) { | |
229 | found = 1; | |
230 | break; | |
231 | } | |
232 | } | |
233 | if (!found) { | |
234 | error = -ENODATA; | |
235 | goto cleanup; | |
236 | } | |
237 | ||
238 | value_len = le16_to_cpu(entry->e_value_size); | |
239 | ||
240 | if (buffer && value_len > buffer_size) { | |
241 | error = -ERANGE; | |
242 | goto cleanup; | |
243 | } | |
244 | ||
245 | if (buffer) { | |
246 | char *pval = entry->e_name + entry->e_name_len; | |
247 | memcpy(buffer, pval, value_len); | |
248 | } | |
249 | error = value_len; | |
250 | ||
251 | cleanup: | |
252 | f2fs_put_page(page, 1); | |
253 | return error; | |
254 | } | |
255 | ||
256 | ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) | |
257 | { | |
258 | struct inode *inode = dentry->d_inode; | |
259 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
260 | struct f2fs_inode_info *fi = F2FS_I(inode); | |
261 | struct f2fs_xattr_entry *entry; | |
262 | struct page *page; | |
263 | void *base_addr; | |
264 | int error = 0; | |
265 | size_t rest = buffer_size; | |
266 | ||
267 | if (!fi->i_xattr_nid) | |
268 | return 0; | |
269 | ||
270 | page = get_node_page(sbi, fi->i_xattr_nid); | |
271 | base_addr = page_address(page); | |
272 | ||
273 | list_for_each_xattr(entry, base_addr) { | |
274 | const struct xattr_handler *handler = | |
275 | f2fs_xattr_handler(entry->e_name_index); | |
276 | size_t size; | |
277 | ||
278 | if (!handler) | |
279 | continue; | |
280 | ||
281 | size = handler->list(dentry, buffer, rest, entry->e_name, | |
282 | entry->e_name_len, handler->flags); | |
283 | if (buffer && size > rest) { | |
284 | error = -ERANGE; | |
285 | goto cleanup; | |
286 | } | |
287 | ||
288 | if (buffer) | |
289 | buffer += size; | |
290 | rest -= size; | |
291 | } | |
292 | error = buffer_size - rest; | |
293 | cleanup: | |
294 | f2fs_put_page(page, 1); | |
295 | return error; | |
296 | } | |
297 | ||
298 | int f2fs_setxattr(struct inode *inode, int name_index, const char *name, | |
299 | const void *value, size_t value_len) | |
300 | { | |
301 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
302 | struct f2fs_inode_info *fi = F2FS_I(inode); | |
303 | struct f2fs_xattr_header *header = NULL; | |
304 | struct f2fs_xattr_entry *here, *last; | |
305 | struct page *page; | |
306 | void *base_addr; | |
9836b8b9 LR |
307 | int error, found, free, newsize; |
308 | size_t name_len; | |
af48b85b JK |
309 | char *pval; |
310 | ||
311 | if (name == NULL) | |
312 | return -EINVAL; | |
313 | name_len = strlen(name); | |
314 | ||
315 | if (value == NULL) | |
316 | value_len = 0; | |
317 | ||
318 | if (name_len > 255 || value_len > MAX_VALUE_LEN) | |
319 | return -ERANGE; | |
320 | ||
7d82db83 JK |
321 | f2fs_balance_fs(sbi); |
322 | ||
af48b85b JK |
323 | mutex_lock_op(sbi, NODE_NEW); |
324 | if (!fi->i_xattr_nid) { | |
325 | /* Allocate new attribute block */ | |
326 | struct dnode_of_data dn; | |
327 | ||
328 | if (!alloc_nid(sbi, &fi->i_xattr_nid)) { | |
329 | mutex_unlock_op(sbi, NODE_NEW); | |
330 | return -ENOSPC; | |
331 | } | |
332 | set_new_dnode(&dn, inode, NULL, NULL, fi->i_xattr_nid); | |
333 | mark_inode_dirty(inode); | |
334 | ||
335 | page = new_node_page(&dn, XATTR_NODE_OFFSET); | |
336 | if (IS_ERR(page)) { | |
337 | alloc_nid_failed(sbi, fi->i_xattr_nid); | |
338 | fi->i_xattr_nid = 0; | |
339 | mutex_unlock_op(sbi, NODE_NEW); | |
340 | return PTR_ERR(page); | |
341 | } | |
342 | ||
343 | alloc_nid_done(sbi, fi->i_xattr_nid); | |
344 | base_addr = page_address(page); | |
345 | header = XATTR_HDR(base_addr); | |
346 | header->h_magic = cpu_to_le32(F2FS_XATTR_MAGIC); | |
347 | header->h_refcount = cpu_to_le32(1); | |
348 | } else { | |
349 | /* The inode already has an extended attribute block. */ | |
350 | page = get_node_page(sbi, fi->i_xattr_nid); | |
351 | if (IS_ERR(page)) { | |
352 | mutex_unlock_op(sbi, NODE_NEW); | |
353 | return PTR_ERR(page); | |
354 | } | |
355 | ||
356 | base_addr = page_address(page); | |
357 | header = XATTR_HDR(base_addr); | |
358 | } | |
359 | ||
360 | if (le32_to_cpu(header->h_magic) != F2FS_XATTR_MAGIC) { | |
361 | error = -EIO; | |
362 | goto cleanup; | |
363 | } | |
364 | ||
365 | /* find entry with wanted name. */ | |
366 | found = 0; | |
367 | list_for_each_xattr(here, base_addr) { | |
368 | if (here->e_name_index != name_index) | |
369 | continue; | |
370 | if (here->e_name_len != name_len) | |
371 | continue; | |
372 | if (!memcmp(here->e_name, name, name_len)) { | |
373 | found = 1; | |
374 | break; | |
375 | } | |
376 | } | |
377 | ||
378 | last = here; | |
379 | ||
380 | while (!IS_XATTR_LAST_ENTRY(last)) | |
381 | last = XATTR_NEXT_ENTRY(last); | |
382 | ||
383 | newsize = XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) + | |
384 | name_len + value_len); | |
385 | ||
386 | /* 1. Check space */ | |
387 | if (value) { | |
388 | /* If value is NULL, it is remove operation. | |
389 | * In case of update operation, we caculate free. | |
390 | */ | |
391 | free = MIN_OFFSET - ((char *)last - (char *)header); | |
392 | if (found) | |
393 | free = free - ENTRY_SIZE(here); | |
394 | ||
395 | if (free < newsize) { | |
396 | error = -ENOSPC; | |
397 | goto cleanup; | |
398 | } | |
399 | } | |
400 | ||
401 | /* 2. Remove old entry */ | |
402 | if (found) { | |
403 | /* If entry is found, remove old entry. | |
404 | * If not found, remove operation is not needed. | |
405 | */ | |
406 | struct f2fs_xattr_entry *next = XATTR_NEXT_ENTRY(here); | |
407 | int oldsize = ENTRY_SIZE(here); | |
408 | ||
409 | memmove(here, next, (char *)last - (char *)next); | |
410 | last = (struct f2fs_xattr_entry *)((char *)last - oldsize); | |
411 | memset(last, 0, oldsize); | |
412 | } | |
413 | ||
414 | /* 3. Write new entry */ | |
415 | if (value) { | |
416 | /* Before we come here, old entry is removed. | |
417 | * We just write new entry. */ | |
418 | memset(last, 0, newsize); | |
419 | last->e_name_index = name_index; | |
420 | last->e_name_len = name_len; | |
421 | memcpy(last->e_name, name, name_len); | |
422 | pval = last->e_name + name_len; | |
423 | memcpy(pval, value, value_len); | |
424 | last->e_value_size = cpu_to_le16(value_len); | |
425 | } | |
426 | ||
427 | set_page_dirty(page); | |
428 | f2fs_put_page(page, 1); | |
429 | ||
430 | if (is_inode_flag_set(fi, FI_ACL_MODE)) { | |
431 | inode->i_mode = fi->i_acl_mode; | |
432 | inode->i_ctime = CURRENT_TIME; | |
433 | clear_inode_flag(fi, FI_ACL_MODE); | |
434 | } | |
435 | f2fs_write_inode(inode, NULL); | |
436 | mutex_unlock_op(sbi, NODE_NEW); | |
437 | ||
438 | return 0; | |
439 | cleanup: | |
440 | f2fs_put_page(page, 1); | |
441 | mutex_unlock_op(sbi, NODE_NEW); | |
442 | return error; | |
443 | } |