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7c1a000d | 1 | // SPDX-License-Identifier: GPL-2.0 |
0a8165d7 | 2 | /* |
af48b85b JK |
3 | * fs/f2fs/xattr.c |
4 | * | |
5 | * Copyright (c) 2012 Samsung Electronics Co., Ltd. | |
6 | * http://www.samsung.com/ | |
7 | * | |
8 | * Portions of this code from linux/fs/ext2/xattr.c | |
9 | * | |
10 | * Copyright (C) 2001-2003 Andreas Gruenbacher <agruen@suse.de> | |
11 | * | |
12 | * Fix by Harrison Xing <harrison@mountainviewdata.com>. | |
13 | * Extended attributes for symlinks and special files added per | |
14 | * suggestion of Luka Renko <luka.renko@hermes.si>. | |
15 | * xattr consolidation Copyright (c) 2004 James Morris <jmorris@redhat.com>, | |
16 | * Red Hat Inc. | |
af48b85b JK |
17 | */ |
18 | #include <linux/rwsem.h> | |
19 | #include <linux/f2fs_fs.h> | |
8ae8f162 | 20 | #include <linux/security.h> |
a6dda0e6 | 21 | #include <linux/posix_acl_xattr.h> |
af48b85b JK |
22 | #include "f2fs.h" |
23 | #include "xattr.h" | |
24 | ||
d9a82a04 | 25 | static int f2fs_xattr_generic_get(const struct xattr_handler *handler, |
b296821a AV |
26 | struct dentry *unused, struct inode *inode, |
27 | const char *name, void *buffer, size_t size) | |
af48b85b | 28 | { |
b296821a | 29 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); |
af48b85b | 30 | |
d9a82a04 | 31 | switch (handler->flags) { |
af48b85b JK |
32 | case F2FS_XATTR_INDEX_USER: |
33 | if (!test_opt(sbi, XATTR_USER)) | |
34 | return -EOPNOTSUPP; | |
35 | break; | |
36 | case F2FS_XATTR_INDEX_TRUSTED: | |
8ae8f162 JK |
37 | case F2FS_XATTR_INDEX_SECURITY: |
38 | break; | |
af48b85b JK |
39 | default: |
40 | return -EINVAL; | |
41 | } | |
b296821a | 42 | return f2fs_getxattr(inode, handler->flags, name, |
d9a82a04 | 43 | buffer, size, NULL); |
af48b85b JK |
44 | } |
45 | ||
d9a82a04 | 46 | static int f2fs_xattr_generic_set(const struct xattr_handler *handler, |
59301226 AV |
47 | struct dentry *unused, struct inode *inode, |
48 | const char *name, const void *value, | |
d9a82a04 | 49 | size_t size, int flags) |
af48b85b | 50 | { |
59301226 | 51 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); |
af48b85b | 52 | |
d9a82a04 | 53 | switch (handler->flags) { |
af48b85b JK |
54 | case F2FS_XATTR_INDEX_USER: |
55 | if (!test_opt(sbi, XATTR_USER)) | |
56 | return -EOPNOTSUPP; | |
57 | break; | |
58 | case F2FS_XATTR_INDEX_TRUSTED: | |
8ae8f162 JK |
59 | case F2FS_XATTR_INDEX_SECURITY: |
60 | break; | |
af48b85b JK |
61 | default: |
62 | return -EINVAL; | |
63 | } | |
59301226 | 64 | return f2fs_setxattr(inode, handler->flags, name, |
c02745ef | 65 | value, size, NULL, flags); |
af48b85b JK |
66 | } |
67 | ||
764a5c6b | 68 | static bool f2fs_xattr_user_list(struct dentry *dentry) |
573ea5fc | 69 | { |
764a5c6b AG |
70 | struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb); |
71 | ||
72 | return test_opt(sbi, XATTR_USER); | |
73 | } | |
573ea5fc | 74 | |
764a5c6b AG |
75 | static bool f2fs_xattr_trusted_list(struct dentry *dentry) |
76 | { | |
77 | return capable(CAP_SYS_ADMIN); | |
573ea5fc JK |
78 | } |
79 | ||
d9a82a04 | 80 | static int f2fs_xattr_advise_get(const struct xattr_handler *handler, |
b296821a AV |
81 | struct dentry *unused, struct inode *inode, |
82 | const char *name, void *buffer, size_t size) | |
573ea5fc | 83 | { |
84e97c27 CY |
84 | if (buffer) |
85 | *((char *)buffer) = F2FS_I(inode)->i_advise; | |
573ea5fc JK |
86 | return sizeof(char); |
87 | } | |
88 | ||
d9a82a04 | 89 | static int f2fs_xattr_advise_set(const struct xattr_handler *handler, |
59301226 AV |
90 | struct dentry *unused, struct inode *inode, |
91 | const char *name, const void *value, | |
d9a82a04 | 92 | size_t size, int flags) |
573ea5fc | 93 | { |
797c1cb5 CY |
94 | unsigned char old_advise = F2FS_I(inode)->i_advise; |
95 | unsigned char new_advise; | |
96 | ||
573ea5fc JK |
97 | if (!inode_owner_or_capable(inode)) |
98 | return -EPERM; | |
99 | if (value == NULL) | |
100 | return -EINVAL; | |
101 | ||
797c1cb5 CY |
102 | new_advise = *(char *)value; |
103 | if (new_advise & ~FADVISE_MODIFIABLE_BITS) | |
104 | return -EINVAL; | |
105 | ||
106 | new_advise = new_advise & FADVISE_MODIFIABLE_BITS; | |
107 | new_advise |= old_advise & ~FADVISE_MODIFIABLE_BITS; | |
108 | ||
109 | F2FS_I(inode)->i_advise = new_advise; | |
7c45729a | 110 | f2fs_mark_inode_dirty_sync(inode, true); |
573ea5fc JK |
111 | return 0; |
112 | } | |
113 | ||
8ae8f162 JK |
114 | #ifdef CONFIG_F2FS_FS_SECURITY |
115 | static int f2fs_initxattrs(struct inode *inode, const struct xattr *xattr_array, | |
116 | void *page) | |
117 | { | |
118 | const struct xattr *xattr; | |
119 | int err = 0; | |
120 | ||
121 | for (xattr = xattr_array; xattr->name != NULL; xattr++) { | |
d631abda | 122 | err = f2fs_setxattr(inode, F2FS_XATTR_INDEX_SECURITY, |
8ae8f162 | 123 | xattr->name, xattr->value, |
c02745ef | 124 | xattr->value_len, (struct page *)page, 0); |
8ae8f162 JK |
125 | if (err < 0) |
126 | break; | |
127 | } | |
128 | return err; | |
129 | } | |
130 | ||
131 | int f2fs_init_security(struct inode *inode, struct inode *dir, | |
132 | const struct qstr *qstr, struct page *ipage) | |
133 | { | |
134 | return security_inode_init_security(inode, dir, qstr, | |
135 | &f2fs_initxattrs, ipage); | |
136 | } | |
137 | #endif | |
138 | ||
af48b85b JK |
139 | const struct xattr_handler f2fs_xattr_user_handler = { |
140 | .prefix = XATTR_USER_PREFIX, | |
141 | .flags = F2FS_XATTR_INDEX_USER, | |
764a5c6b | 142 | .list = f2fs_xattr_user_list, |
af48b85b JK |
143 | .get = f2fs_xattr_generic_get, |
144 | .set = f2fs_xattr_generic_set, | |
145 | }; | |
146 | ||
147 | const struct xattr_handler f2fs_xattr_trusted_handler = { | |
148 | .prefix = XATTR_TRUSTED_PREFIX, | |
149 | .flags = F2FS_XATTR_INDEX_TRUSTED, | |
764a5c6b | 150 | .list = f2fs_xattr_trusted_list, |
af48b85b JK |
151 | .get = f2fs_xattr_generic_get, |
152 | .set = f2fs_xattr_generic_set, | |
153 | }; | |
154 | ||
573ea5fc | 155 | const struct xattr_handler f2fs_xattr_advise_handler = { |
98e9cb57 | 156 | .name = F2FS_SYSTEM_ADVISE_NAME, |
573ea5fc | 157 | .flags = F2FS_XATTR_INDEX_ADVISE, |
573ea5fc JK |
158 | .get = f2fs_xattr_advise_get, |
159 | .set = f2fs_xattr_advise_set, | |
160 | }; | |
161 | ||
8ae8f162 JK |
162 | const struct xattr_handler f2fs_xattr_security_handler = { |
163 | .prefix = XATTR_SECURITY_PREFIX, | |
164 | .flags = F2FS_XATTR_INDEX_SECURITY, | |
8ae8f162 JK |
165 | .get = f2fs_xattr_generic_get, |
166 | .set = f2fs_xattr_generic_set, | |
167 | }; | |
168 | ||
af48b85b JK |
169 | static const struct xattr_handler *f2fs_xattr_handler_map[] = { |
170 | [F2FS_XATTR_INDEX_USER] = &f2fs_xattr_user_handler, | |
171 | #ifdef CONFIG_F2FS_FS_POSIX_ACL | |
a6dda0e6 CH |
172 | [F2FS_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler, |
173 | [F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler, | |
af48b85b JK |
174 | #endif |
175 | [F2FS_XATTR_INDEX_TRUSTED] = &f2fs_xattr_trusted_handler, | |
8ae8f162 JK |
176 | #ifdef CONFIG_F2FS_FS_SECURITY |
177 | [F2FS_XATTR_INDEX_SECURITY] = &f2fs_xattr_security_handler, | |
178 | #endif | |
af48b85b JK |
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 | |
a6dda0e6 CH |
185 | &posix_acl_access_xattr_handler, |
186 | &posix_acl_default_xattr_handler, | |
af48b85b JK |
187 | #endif |
188 | &f2fs_xattr_trusted_handler, | |
8ae8f162 JK |
189 | #ifdef CONFIG_F2FS_FS_SECURITY |
190 | &f2fs_xattr_security_handler, | |
191 | #endif | |
af48b85b JK |
192 | &f2fs_xattr_advise_handler, |
193 | NULL, | |
194 | }; | |
195 | ||
e1123268 | 196 | static inline const struct xattr_handler *f2fs_xattr_handler(int index) |
af48b85b JK |
197 | { |
198 | const struct xattr_handler *handler = NULL; | |
199 | ||
e1123268 JK |
200 | if (index > 0 && index < ARRAY_SIZE(f2fs_xattr_handler_map)) |
201 | handler = f2fs_xattr_handler_map[index]; | |
af48b85b JK |
202 | return handler; |
203 | } | |
204 | ||
e1123268 JK |
205 | static struct f2fs_xattr_entry *__find_xattr(void *base_addr, int index, |
206 | size_t len, const char *name) | |
dd9cfe23 JK |
207 | { |
208 | struct f2fs_xattr_entry *entry; | |
209 | ||
210 | list_for_each_xattr(entry, base_addr) { | |
e1123268 | 211 | if (entry->e_name_index != index) |
dd9cfe23 | 212 | continue; |
e1123268 | 213 | if (entry->e_name_len != len) |
dd9cfe23 | 214 | continue; |
e1123268 | 215 | if (!memcmp(entry->e_name, name, len)) |
dd9cfe23 JK |
216 | break; |
217 | } | |
218 | return entry; | |
219 | } | |
220 | ||
6afc662e CY |
221 | static struct f2fs_xattr_entry *__find_inline_xattr(struct inode *inode, |
222 | void *base_addr, void **last_addr, int index, | |
223 | size_t len, const char *name) | |
ba38c27e CY |
224 | { |
225 | struct f2fs_xattr_entry *entry; | |
6afc662e | 226 | unsigned int inline_size = inline_xattr_size(inode); |
2c28aba8 | 227 | void *max_addr = base_addr + inline_size; |
ba38c27e CY |
228 | |
229 | list_for_each_xattr(entry, base_addr) { | |
2c28aba8 CY |
230 | if ((void *)entry + sizeof(__u32) > max_addr || |
231 | (void *)XATTR_NEXT_ENTRY(entry) > max_addr) { | |
ba38c27e CY |
232 | *last_addr = entry; |
233 | return NULL; | |
234 | } | |
235 | if (entry->e_name_index != index) | |
236 | continue; | |
237 | if (entry->e_name_len != len) | |
238 | continue; | |
239 | if (!memcmp(entry->e_name, name, len)) | |
240 | break; | |
241 | } | |
2c28aba8 CY |
242 | |
243 | /* inline xattr header or entry across max inline xattr size */ | |
244 | if (IS_XATTR_LAST_ENTRY(entry) && | |
245 | (void *)entry + sizeof(__u32) > max_addr) { | |
246 | *last_addr = entry; | |
247 | return NULL; | |
248 | } | |
ba38c27e CY |
249 | return entry; |
250 | } | |
251 | ||
a5f433f7 CY |
252 | static int read_inline_xattr(struct inode *inode, struct page *ipage, |
253 | void *txattr_addr) | |
254 | { | |
255 | struct f2fs_sb_info *sbi = F2FS_I_SB(inode); | |
256 | unsigned int inline_size = inline_xattr_size(inode); | |
257 | struct page *page = NULL; | |
258 | void *inline_addr; | |
259 | ||
260 | if (ipage) { | |
6afc662e | 261 | inline_addr = inline_xattr_addr(inode, ipage); |
a5f433f7 | 262 | } else { |
4d57b86d | 263 | page = f2fs_get_node_page(sbi, inode->i_ino); |
a5f433f7 CY |
264 | if (IS_ERR(page)) |
265 | return PTR_ERR(page); | |
266 | ||
6afc662e | 267 | inline_addr = inline_xattr_addr(inode, page); |
a5f433f7 CY |
268 | } |
269 | memcpy(txattr_addr, inline_addr, inline_size); | |
270 | f2fs_put_page(page, 1); | |
271 | ||
272 | return 0; | |
273 | } | |
274 | ||
63840695 CY |
275 | static int read_xattr_block(struct inode *inode, void *txattr_addr) |
276 | { | |
277 | struct f2fs_sb_info *sbi = F2FS_I_SB(inode); | |
278 | nid_t xnid = F2FS_I(inode)->i_xattr_nid; | |
279 | unsigned int inline_size = inline_xattr_size(inode); | |
280 | struct page *xpage; | |
281 | void *xattr_addr; | |
282 | ||
283 | /* The inode already has an extended attribute block. */ | |
4d57b86d | 284 | xpage = f2fs_get_node_page(sbi, xnid); |
63840695 CY |
285 | if (IS_ERR(xpage)) |
286 | return PTR_ERR(xpage); | |
287 | ||
288 | xattr_addr = page_address(xpage); | |
289 | memcpy(txattr_addr + inline_size, xattr_addr, VALID_XATTR_BLOCK_SIZE); | |
290 | f2fs_put_page(xpage, 1); | |
291 | ||
292 | return 0; | |
293 | } | |
294 | ||
ba38c27e CY |
295 | static int lookup_all_xattrs(struct inode *inode, struct page *ipage, |
296 | unsigned int index, unsigned int len, | |
297 | const char *name, struct f2fs_xattr_entry **xe, | |
64beba05 | 298 | void **base_addr, int *base_size) |
ba38c27e | 299 | { |
ba38c27e CY |
300 | void *cur_addr, *txattr_addr, *last_addr = NULL; |
301 | nid_t xnid = F2FS_I(inode)->i_xattr_nid; | |
302 | unsigned int size = xnid ? VALID_XATTR_BLOCK_SIZE : 0; | |
89e9eabd | 303 | unsigned int inline_size = inline_xattr_size(inode); |
ba38c27e CY |
304 | int err = 0; |
305 | ||
ba38c27e CY |
306 | if (!size && !inline_size) |
307 | return -ENODATA; | |
308 | ||
64beba05 JK |
309 | *base_size = inline_size + size + XATTR_PADDING_SIZE; |
310 | txattr_addr = f2fs_kzalloc(F2FS_I_SB(inode), *base_size, GFP_NOFS); | |
ba38c27e CY |
311 | if (!txattr_addr) |
312 | return -ENOMEM; | |
313 | ||
314 | /* read from inline xattr */ | |
315 | if (inline_size) { | |
a5f433f7 CY |
316 | err = read_inline_xattr(inode, ipage, txattr_addr); |
317 | if (err) | |
318 | goto out; | |
ba38c27e | 319 | |
6afc662e | 320 | *xe = __find_inline_xattr(inode, txattr_addr, &last_addr, |
ba38c27e | 321 | index, len, name); |
64beba05 JK |
322 | if (*xe) { |
323 | *base_size = inline_size; | |
ba38c27e | 324 | goto check; |
64beba05 | 325 | } |
ba38c27e CY |
326 | } |
327 | ||
328 | /* read from xattr node block */ | |
329 | if (xnid) { | |
63840695 CY |
330 | err = read_xattr_block(inode, txattr_addr); |
331 | if (err) | |
ba38c27e | 332 | goto out; |
ba38c27e CY |
333 | } |
334 | ||
335 | if (last_addr) | |
336 | cur_addr = XATTR_HDR(last_addr) - 1; | |
337 | else | |
338 | cur_addr = txattr_addr; | |
339 | ||
340 | *xe = __find_xattr(cur_addr, index, len, name); | |
341 | check: | |
342 | if (IS_XATTR_LAST_ENTRY(*xe)) { | |
343 | err = -ENODATA; | |
344 | goto out; | |
345 | } | |
346 | ||
347 | *base_addr = txattr_addr; | |
348 | return 0; | |
349 | out: | |
2a6a7e72 | 350 | kvfree(txattr_addr); |
ba38c27e CY |
351 | return err; |
352 | } | |
353 | ||
86696966 CY |
354 | static int read_all_xattrs(struct inode *inode, struct page *ipage, |
355 | void **base_addr) | |
65985d93 | 356 | { |
65985d93 | 357 | struct f2fs_xattr_header *header; |
89e9eabd CY |
358 | nid_t xnid = F2FS_I(inode)->i_xattr_nid; |
359 | unsigned int size = VALID_XATTR_BLOCK_SIZE; | |
360 | unsigned int inline_size = inline_xattr_size(inode); | |
65985d93 | 361 | void *txattr_addr; |
86696966 | 362 | int err; |
65985d93 | 363 | |
acbf054d CY |
364 | txattr_addr = f2fs_kzalloc(F2FS_I_SB(inode), |
365 | inline_size + size + XATTR_PADDING_SIZE, GFP_NOFS); | |
65985d93 | 366 | if (!txattr_addr) |
86696966 | 367 | return -ENOMEM; |
65985d93 JK |
368 | |
369 | /* read from inline xattr */ | |
370 | if (inline_size) { | |
a5f433f7 CY |
371 | err = read_inline_xattr(inode, ipage, txattr_addr); |
372 | if (err) | |
373 | goto fail; | |
65985d93 JK |
374 | } |
375 | ||
376 | /* read from xattr node block */ | |
89e9eabd | 377 | if (xnid) { |
63840695 CY |
378 | err = read_xattr_block(inode, txattr_addr); |
379 | if (err) | |
65985d93 | 380 | goto fail; |
65985d93 JK |
381 | } |
382 | ||
383 | header = XATTR_HDR(txattr_addr); | |
384 | ||
385 | /* never been allocated xattrs */ | |
386 | if (le32_to_cpu(header->h_magic) != F2FS_XATTR_MAGIC) { | |
387 | header->h_magic = cpu_to_le32(F2FS_XATTR_MAGIC); | |
388 | header->h_refcount = cpu_to_le32(1); | |
389 | } | |
86696966 CY |
390 | *base_addr = txattr_addr; |
391 | return 0; | |
65985d93 | 392 | fail: |
2a6a7e72 | 393 | kvfree(txattr_addr); |
86696966 | 394 | return err; |
65985d93 JK |
395 | } |
396 | ||
397 | static inline int write_all_xattrs(struct inode *inode, __u32 hsize, | |
398 | void *txattr_addr, struct page *ipage) | |
399 | { | |
4081363f | 400 | struct f2fs_sb_info *sbi = F2FS_I_SB(inode); |
89e9eabd | 401 | size_t inline_size = inline_xattr_size(inode); |
bf9c1427 | 402 | struct page *in_page = NULL; |
65985d93 | 403 | void *xattr_addr; |
bf9c1427 | 404 | void *inline_addr = NULL; |
65985d93 JK |
405 | struct page *xpage; |
406 | nid_t new_nid = 0; | |
bf9c1427 | 407 | int err = 0; |
65985d93 | 408 | |
65985d93 | 409 | if (hsize > inline_size && !F2FS_I(inode)->i_xattr_nid) |
4d57b86d | 410 | if (!f2fs_alloc_nid(sbi, &new_nid)) |
65985d93 JK |
411 | return -ENOSPC; |
412 | ||
413 | /* write to inline xattr */ | |
414 | if (inline_size) { | |
65985d93 | 415 | if (ipage) { |
6afc662e | 416 | inline_addr = inline_xattr_addr(inode, ipage); |
65985d93 | 417 | } else { |
4d57b86d | 418 | in_page = f2fs_get_node_page(sbi, inode->i_ino); |
bf9c1427 | 419 | if (IS_ERR(in_page)) { |
4d57b86d | 420 | f2fs_alloc_nid_failed(sbi, new_nid); |
bf9c1427 | 421 | return PTR_ERR(in_page); |
65985d93 | 422 | } |
bf9c1427 | 423 | inline_addr = inline_xattr_addr(inode, in_page); |
65985d93 | 424 | } |
65985d93 | 425 | |
bf9c1427 | 426 | f2fs_wait_on_page_writeback(ipage ? ipage : in_page, |
bae0ee7a | 427 | NODE, true, true); |
65985d93 JK |
428 | /* no need to use xattr node block */ |
429 | if (hsize <= inline_size) { | |
4d57b86d CY |
430 | err = f2fs_truncate_xattr_node(inode); |
431 | f2fs_alloc_nid_failed(sbi, new_nid); | |
bf9c1427 JK |
432 | if (err) { |
433 | f2fs_put_page(in_page, 1); | |
434 | return err; | |
435 | } | |
436 | memcpy(inline_addr, txattr_addr, inline_size); | |
437 | set_page_dirty(ipage ? ipage : in_page); | |
438 | goto in_page_out; | |
65985d93 JK |
439 | } |
440 | } | |
441 | ||
442 | /* write to xattr node block */ | |
443 | if (F2FS_I(inode)->i_xattr_nid) { | |
4d57b86d | 444 | xpage = f2fs_get_node_page(sbi, F2FS_I(inode)->i_xattr_nid); |
65985d93 | 445 | if (IS_ERR(xpage)) { |
d620439f | 446 | err = PTR_ERR(xpage); |
4d57b86d | 447 | f2fs_alloc_nid_failed(sbi, new_nid); |
bf9c1427 | 448 | goto in_page_out; |
65985d93 | 449 | } |
9850cf4a | 450 | f2fs_bug_on(sbi, new_nid); |
bae0ee7a | 451 | f2fs_wait_on_page_writeback(xpage, NODE, true, true); |
65985d93 JK |
452 | } else { |
453 | struct dnode_of_data dn; | |
454 | set_new_dnode(&dn, inode, NULL, NULL, new_nid); | |
4d57b86d | 455 | xpage = f2fs_new_node_page(&dn, XATTR_NODE_OFFSET); |
65985d93 | 456 | if (IS_ERR(xpage)) { |
d620439f | 457 | err = PTR_ERR(xpage); |
4d57b86d | 458 | f2fs_alloc_nid_failed(sbi, new_nid); |
bf9c1427 | 459 | goto in_page_out; |
65985d93 | 460 | } |
4d57b86d | 461 | f2fs_alloc_nid_done(sbi, new_nid); |
65985d93 | 462 | } |
65985d93 | 463 | xattr_addr = page_address(xpage); |
bf9c1427 JK |
464 | |
465 | if (inline_size) | |
466 | memcpy(inline_addr, txattr_addr, inline_size); | |
22588f87 | 467 | memcpy(xattr_addr, txattr_addr + inline_size, VALID_XATTR_BLOCK_SIZE); |
bf9c1427 JK |
468 | |
469 | if (inline_size) | |
470 | set_page_dirty(ipage ? ipage : in_page); | |
65985d93 | 471 | set_page_dirty(xpage); |
65985d93 | 472 | |
bf9c1427 JK |
473 | f2fs_put_page(xpage, 1); |
474 | in_page_out: | |
475 | f2fs_put_page(in_page, 1); | |
476 | return err; | |
65985d93 JK |
477 | } |
478 | ||
e1123268 | 479 | int f2fs_getxattr(struct inode *inode, int index, const char *name, |
bce8d112 | 480 | void *buffer, size_t buffer_size, struct page *ipage) |
af48b85b | 481 | { |
ba38c27e | 482 | struct f2fs_xattr_entry *entry = NULL; |
dd9cfe23 | 483 | int error = 0; |
ba38c27e | 484 | unsigned int size, len; |
ba38c27e | 485 | void *base_addr = NULL; |
64beba05 | 486 | int base_size; |
af48b85b JK |
487 | |
488 | if (name == NULL) | |
489 | return -EINVAL; | |
e1123268 JK |
490 | |
491 | len = strlen(name); | |
492 | if (len > F2FS_NAME_LEN) | |
6e452d69 | 493 | return -ERANGE; |
af48b85b | 494 | |
27161f13 | 495 | down_read(&F2FS_I(inode)->i_xattr_sem); |
ba38c27e | 496 | error = lookup_all_xattrs(inode, ipage, index, len, name, |
64beba05 | 497 | &entry, &base_addr, &base_size); |
27161f13 | 498 | up_read(&F2FS_I(inode)->i_xattr_sem); |
86696966 CY |
499 | if (error) |
500 | return error; | |
af48b85b | 501 | |
e1123268 | 502 | size = le16_to_cpu(entry->e_value_size); |
af48b85b | 503 | |
e1123268 | 504 | if (buffer && size > buffer_size) { |
af48b85b | 505 | error = -ERANGE; |
ba38c27e | 506 | goto out; |
af48b85b JK |
507 | } |
508 | ||
509 | if (buffer) { | |
510 | char *pval = entry->e_name + entry->e_name_len; | |
64beba05 JK |
511 | |
512 | if (base_size - (pval - (char *)base_addr) < size) { | |
513 | error = -ERANGE; | |
514 | goto out; | |
515 | } | |
e1123268 | 516 | memcpy(buffer, pval, size); |
af48b85b | 517 | } |
e1123268 | 518 | error = size; |
ba38c27e | 519 | out: |
2a6a7e72 | 520 | kvfree(base_addr); |
af48b85b JK |
521 | return error; |
522 | } | |
523 | ||
524 | ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) | |
525 | { | |
2b0143b5 | 526 | struct inode *inode = d_inode(dentry); |
af48b85b | 527 | struct f2fs_xattr_entry *entry; |
af48b85b JK |
528 | void *base_addr; |
529 | int error = 0; | |
530 | size_t rest = buffer_size; | |
531 | ||
27161f13 | 532 | down_read(&F2FS_I(inode)->i_xattr_sem); |
86696966 | 533 | error = read_all_xattrs(inode, NULL, &base_addr); |
27161f13 | 534 | up_read(&F2FS_I(inode)->i_xattr_sem); |
86696966 CY |
535 | if (error) |
536 | return error; | |
af48b85b JK |
537 | |
538 | list_for_each_xattr(entry, base_addr) { | |
539 | const struct xattr_handler *handler = | |
540 | f2fs_xattr_handler(entry->e_name_index); | |
764a5c6b AG |
541 | const char *prefix; |
542 | size_t prefix_len; | |
af48b85b JK |
543 | size_t size; |
544 | ||
764a5c6b | 545 | if (!handler || (handler->list && !handler->list(dentry))) |
af48b85b JK |
546 | continue; |
547 | ||
eecfa427 | 548 | prefix = xattr_prefix(handler); |
764a5c6b AG |
549 | prefix_len = strlen(prefix); |
550 | size = prefix_len + entry->e_name_len + 1; | |
551 | if (buffer) { | |
552 | if (size > rest) { | |
553 | error = -ERANGE; | |
554 | goto cleanup; | |
555 | } | |
556 | memcpy(buffer, prefix, prefix_len); | |
557 | buffer += prefix_len; | |
558 | memcpy(buffer, entry->e_name, entry->e_name_len); | |
559 | buffer += entry->e_name_len; | |
560 | *buffer++ = 0; | |
af48b85b | 561 | } |
af48b85b JK |
562 | rest -= size; |
563 | } | |
564 | error = buffer_size - rest; | |
565 | cleanup: | |
2a6a7e72 | 566 | kvfree(base_addr); |
af48b85b JK |
567 | return error; |
568 | } | |
569 | ||
5f35a2cd KM |
570 | static bool f2fs_xattr_value_same(struct f2fs_xattr_entry *entry, |
571 | const void *value, size_t size) | |
572 | { | |
573 | void *pval = entry->e_name + entry->e_name_len; | |
b71deadb JK |
574 | |
575 | return (le16_to_cpu(entry->e_value_size) == size) && | |
576 | !memcmp(pval, value, size); | |
5f35a2cd KM |
577 | } |
578 | ||
e1123268 JK |
579 | static int __f2fs_setxattr(struct inode *inode, int index, |
580 | const char *name, const void *value, size_t size, | |
c02745ef | 581 | struct page *ipage, int flags) |
af48b85b | 582 | { |
af48b85b | 583 | struct f2fs_xattr_entry *here, *last; |
af48b85b | 584 | void *base_addr; |
65985d93 | 585 | int found, newsize; |
e1123268 | 586 | size_t len; |
65985d93 | 587 | __u32 new_hsize; |
a0995af6 | 588 | int error = 0; |
af48b85b JK |
589 | |
590 | if (name == NULL) | |
591 | return -EINVAL; | |
af48b85b JK |
592 | |
593 | if (value == NULL) | |
e1123268 | 594 | size = 0; |
af48b85b | 595 | |
e1123268 | 596 | len = strlen(name); |
7c909772 | 597 | |
037fe70c | 598 | if (len > F2FS_NAME_LEN) |
af48b85b JK |
599 | return -ERANGE; |
600 | ||
037fe70c CY |
601 | if (size > MAX_VALUE_LEN(inode)) |
602 | return -E2BIG; | |
603 | ||
86696966 CY |
604 | error = read_all_xattrs(inode, ipage, &base_addr); |
605 | if (error) | |
606 | return error; | |
af48b85b JK |
607 | |
608 | /* find entry with wanted name. */ | |
e1123268 | 609 | here = __find_xattr(base_addr, index, len, name); |
af48b85b | 610 | |
dd9cfe23 | 611 | found = IS_XATTR_LAST_ENTRY(here) ? 0 : 1; |
af48b85b | 612 | |
5f35a2cd KM |
613 | if (found) { |
614 | if ((flags & XATTR_CREATE)) { | |
615 | error = -EEXIST; | |
616 | goto exit; | |
617 | } | |
618 | ||
b2c4692b | 619 | if (value && f2fs_xattr_value_same(here, value, size)) |
5f35a2cd KM |
620 | goto exit; |
621 | } else if ((flags & XATTR_REPLACE)) { | |
916decbf JK |
622 | error = -ENODATA; |
623 | goto exit; | |
916decbf JK |
624 | } |
625 | ||
626 | last = here; | |
af48b85b JK |
627 | while (!IS_XATTR_LAST_ENTRY(last)) |
628 | last = XATTR_NEXT_ENTRY(last); | |
629 | ||
e1123268 | 630 | newsize = XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) + len + size); |
af48b85b JK |
631 | |
632 | /* 1. Check space */ | |
633 | if (value) { | |
65985d93 JK |
634 | int free; |
635 | /* | |
636 | * If value is NULL, it is remove operation. | |
e1c42045 | 637 | * In case of update operation, we calculate free. |
af48b85b | 638 | */ |
65985d93 | 639 | free = MIN_OFFSET(inode) - ((char *)last - (char *)base_addr); |
af48b85b | 640 | if (found) |
cc3de6a3 | 641 | free = free + ENTRY_SIZE(here); |
af48b85b | 642 | |
6bacf52f | 643 | if (unlikely(free < newsize)) { |
58457f1c | 644 | error = -E2BIG; |
65985d93 | 645 | goto exit; |
af48b85b JK |
646 | } |
647 | } | |
648 | ||
649 | /* 2. Remove old entry */ | |
650 | if (found) { | |
65985d93 JK |
651 | /* |
652 | * If entry is found, remove old entry. | |
af48b85b JK |
653 | * If not found, remove operation is not needed. |
654 | */ | |
655 | struct f2fs_xattr_entry *next = XATTR_NEXT_ENTRY(here); | |
656 | int oldsize = ENTRY_SIZE(here); | |
657 | ||
658 | memmove(here, next, (char *)last - (char *)next); | |
659 | last = (struct f2fs_xattr_entry *)((char *)last - oldsize); | |
660 | memset(last, 0, oldsize); | |
661 | } | |
662 | ||
65985d93 JK |
663 | new_hsize = (char *)last - (char *)base_addr; |
664 | ||
af48b85b JK |
665 | /* 3. Write new entry */ |
666 | if (value) { | |
65985d93 JK |
667 | char *pval; |
668 | /* | |
669 | * Before we come here, old entry is removed. | |
670 | * We just write new entry. | |
671 | */ | |
e1123268 JK |
672 | last->e_name_index = index; |
673 | last->e_name_len = len; | |
674 | memcpy(last->e_name, name, len); | |
675 | pval = last->e_name + len; | |
676 | memcpy(pval, value, size); | |
677 | last->e_value_size = cpu_to_le16(size); | |
65985d93 | 678 | new_hsize += newsize; |
af48b85b JK |
679 | } |
680 | ||
65985d93 JK |
681 | error = write_all_xattrs(inode, new_hsize, base_addr, ipage); |
682 | if (error) | |
683 | goto exit; | |
af48b85b | 684 | |
91942321 JK |
685 | if (is_inode_flag_set(inode, FI_ACL_MODE)) { |
686 | inode->i_mode = F2FS_I(inode)->i_acl_mode; | |
c2050a45 | 687 | inode->i_ctime = current_time(inode); |
91942321 | 688 | clear_inode_flag(inode, FI_ACL_MODE); |
af48b85b | 689 | } |
f424f664 JK |
690 | if (index == F2FS_XATTR_INDEX_ENCRYPTION && |
691 | !strcmp(name, F2FS_XATTR_NAME_ENCRYPTION_CONTEXT)) | |
692 | f2fs_set_encrypted_inode(inode); | |
7c45729a | 693 | f2fs_mark_inode_dirty_sync(inode, true); |
bbf156f7 JK |
694 | if (!error && S_ISDIR(inode->i_mode)) |
695 | set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_CP); | |
7c909772 | 696 | exit: |
2a6a7e72 | 697 | kvfree(base_addr); |
af48b85b JK |
698 | return error; |
699 | } | |
52ab9560 | 700 | |
e1123268 JK |
701 | int f2fs_setxattr(struct inode *inode, int index, const char *name, |
702 | const void *value, size_t size, | |
c02745ef | 703 | struct page *ipage, int flags) |
52ab9560 | 704 | { |
4081363f | 705 | struct f2fs_sb_info *sbi = F2FS_I_SB(inode); |
52ab9560 RK |
706 | int err; |
707 | ||
d8d1389e JK |
708 | err = dquot_initialize(inode); |
709 | if (err) | |
710 | return err; | |
711 | ||
4d57b86d | 712 | /* this case is only from f2fs_init_inode_metadata */ |
d631abda JK |
713 | if (ipage) |
714 | return __f2fs_setxattr(inode, index, name, value, | |
715 | size, ipage, flags); | |
2c4db1a6 | 716 | f2fs_balance_fs(sbi, true); |
52ab9560 | 717 | |
e479556b | 718 | f2fs_lock_op(sbi); |
d928bfbf JK |
719 | /* protect xattr_ver */ |
720 | down_write(&F2FS_I(inode)->i_sem); | |
27161f13 | 721 | down_write(&F2FS_I(inode)->i_xattr_sem); |
c02745ef | 722 | err = __f2fs_setxattr(inode, index, name, value, size, ipage, flags); |
27161f13 | 723 | up_write(&F2FS_I(inode)->i_xattr_sem); |
d928bfbf | 724 | up_write(&F2FS_I(inode)->i_sem); |
e479556b | 725 | f2fs_unlock_op(sbi); |
52ab9560 | 726 | |
d0239e1b | 727 | f2fs_update_time(sbi, REQ_TIME); |
52ab9560 RK |
728 | return err; |
729 | } |