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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); |
ba38c27e CY |
227 | |
228 | list_for_each_xattr(entry, base_addr) { | |
229 | if ((void *)entry + sizeof(__u32) > base_addr + inline_size || | |
230 | (void *)XATTR_NEXT_ENTRY(entry) + sizeof(__u32) > | |
231 | base_addr + inline_size) { | |
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 | } | |
242 | return entry; | |
243 | } | |
244 | ||
a5f433f7 CY |
245 | static int read_inline_xattr(struct inode *inode, struct page *ipage, |
246 | void *txattr_addr) | |
247 | { | |
248 | struct f2fs_sb_info *sbi = F2FS_I_SB(inode); | |
249 | unsigned int inline_size = inline_xattr_size(inode); | |
250 | struct page *page = NULL; | |
251 | void *inline_addr; | |
252 | ||
253 | if (ipage) { | |
6afc662e | 254 | inline_addr = inline_xattr_addr(inode, ipage); |
a5f433f7 | 255 | } else { |
4d57b86d | 256 | page = f2fs_get_node_page(sbi, inode->i_ino); |
a5f433f7 CY |
257 | if (IS_ERR(page)) |
258 | return PTR_ERR(page); | |
259 | ||
6afc662e | 260 | inline_addr = inline_xattr_addr(inode, page); |
a5f433f7 CY |
261 | } |
262 | memcpy(txattr_addr, inline_addr, inline_size); | |
263 | f2fs_put_page(page, 1); | |
264 | ||
265 | return 0; | |
266 | } | |
267 | ||
63840695 CY |
268 | static int read_xattr_block(struct inode *inode, void *txattr_addr) |
269 | { | |
270 | struct f2fs_sb_info *sbi = F2FS_I_SB(inode); | |
271 | nid_t xnid = F2FS_I(inode)->i_xattr_nid; | |
272 | unsigned int inline_size = inline_xattr_size(inode); | |
273 | struct page *xpage; | |
274 | void *xattr_addr; | |
275 | ||
276 | /* The inode already has an extended attribute block. */ | |
4d57b86d | 277 | xpage = f2fs_get_node_page(sbi, xnid); |
63840695 CY |
278 | if (IS_ERR(xpage)) |
279 | return PTR_ERR(xpage); | |
280 | ||
281 | xattr_addr = page_address(xpage); | |
282 | memcpy(txattr_addr + inline_size, xattr_addr, VALID_XATTR_BLOCK_SIZE); | |
283 | f2fs_put_page(xpage, 1); | |
284 | ||
285 | return 0; | |
286 | } | |
287 | ||
ba38c27e CY |
288 | static int lookup_all_xattrs(struct inode *inode, struct page *ipage, |
289 | unsigned int index, unsigned int len, | |
290 | const char *name, struct f2fs_xattr_entry **xe, | |
291 | void **base_addr) | |
292 | { | |
ba38c27e CY |
293 | void *cur_addr, *txattr_addr, *last_addr = NULL; |
294 | nid_t xnid = F2FS_I(inode)->i_xattr_nid; | |
295 | unsigned int size = xnid ? VALID_XATTR_BLOCK_SIZE : 0; | |
89e9eabd | 296 | unsigned int inline_size = inline_xattr_size(inode); |
ba38c27e CY |
297 | int err = 0; |
298 | ||
ba38c27e CY |
299 | if (!size && !inline_size) |
300 | return -ENODATA; | |
301 | ||
acbf054d CY |
302 | txattr_addr = f2fs_kzalloc(F2FS_I_SB(inode), |
303 | inline_size + size + XATTR_PADDING_SIZE, GFP_NOFS); | |
ba38c27e CY |
304 | if (!txattr_addr) |
305 | return -ENOMEM; | |
306 | ||
307 | /* read from inline xattr */ | |
308 | if (inline_size) { | |
a5f433f7 CY |
309 | err = read_inline_xattr(inode, ipage, txattr_addr); |
310 | if (err) | |
311 | goto out; | |
ba38c27e | 312 | |
6afc662e | 313 | *xe = __find_inline_xattr(inode, txattr_addr, &last_addr, |
ba38c27e CY |
314 | index, len, name); |
315 | if (*xe) | |
316 | goto check; | |
317 | } | |
318 | ||
319 | /* read from xattr node block */ | |
320 | if (xnid) { | |
63840695 CY |
321 | err = read_xattr_block(inode, txattr_addr); |
322 | if (err) | |
ba38c27e | 323 | goto out; |
ba38c27e CY |
324 | } |
325 | ||
326 | if (last_addr) | |
327 | cur_addr = XATTR_HDR(last_addr) - 1; | |
328 | else | |
329 | cur_addr = txattr_addr; | |
330 | ||
331 | *xe = __find_xattr(cur_addr, index, len, name); | |
332 | check: | |
333 | if (IS_XATTR_LAST_ENTRY(*xe)) { | |
334 | err = -ENODATA; | |
335 | goto out; | |
336 | } | |
337 | ||
338 | *base_addr = txattr_addr; | |
339 | return 0; | |
340 | out: | |
341 | kzfree(txattr_addr); | |
342 | return err; | |
343 | } | |
344 | ||
86696966 CY |
345 | static int read_all_xattrs(struct inode *inode, struct page *ipage, |
346 | void **base_addr) | |
65985d93 | 347 | { |
65985d93 | 348 | struct f2fs_xattr_header *header; |
89e9eabd CY |
349 | nid_t xnid = F2FS_I(inode)->i_xattr_nid; |
350 | unsigned int size = VALID_XATTR_BLOCK_SIZE; | |
351 | unsigned int inline_size = inline_xattr_size(inode); | |
65985d93 | 352 | void *txattr_addr; |
86696966 | 353 | int err; |
65985d93 | 354 | |
acbf054d CY |
355 | txattr_addr = f2fs_kzalloc(F2FS_I_SB(inode), |
356 | inline_size + size + XATTR_PADDING_SIZE, GFP_NOFS); | |
65985d93 | 357 | if (!txattr_addr) |
86696966 | 358 | return -ENOMEM; |
65985d93 JK |
359 | |
360 | /* read from inline xattr */ | |
361 | if (inline_size) { | |
a5f433f7 CY |
362 | err = read_inline_xattr(inode, ipage, txattr_addr); |
363 | if (err) | |
364 | goto fail; | |
65985d93 JK |
365 | } |
366 | ||
367 | /* read from xattr node block */ | |
89e9eabd | 368 | if (xnid) { |
63840695 CY |
369 | err = read_xattr_block(inode, txattr_addr); |
370 | if (err) | |
65985d93 | 371 | goto fail; |
65985d93 JK |
372 | } |
373 | ||
374 | header = XATTR_HDR(txattr_addr); | |
375 | ||
376 | /* never been allocated xattrs */ | |
377 | if (le32_to_cpu(header->h_magic) != F2FS_XATTR_MAGIC) { | |
378 | header->h_magic = cpu_to_le32(F2FS_XATTR_MAGIC); | |
379 | header->h_refcount = cpu_to_le32(1); | |
380 | } | |
86696966 CY |
381 | *base_addr = txattr_addr; |
382 | return 0; | |
65985d93 JK |
383 | fail: |
384 | kzfree(txattr_addr); | |
86696966 | 385 | return err; |
65985d93 JK |
386 | } |
387 | ||
388 | static inline int write_all_xattrs(struct inode *inode, __u32 hsize, | |
389 | void *txattr_addr, struct page *ipage) | |
390 | { | |
4081363f | 391 | struct f2fs_sb_info *sbi = F2FS_I_SB(inode); |
89e9eabd | 392 | size_t inline_size = inline_xattr_size(inode); |
bf9c1427 | 393 | struct page *in_page = NULL; |
65985d93 | 394 | void *xattr_addr; |
bf9c1427 | 395 | void *inline_addr = NULL; |
65985d93 JK |
396 | struct page *xpage; |
397 | nid_t new_nid = 0; | |
bf9c1427 | 398 | int err = 0; |
65985d93 | 399 | |
65985d93 | 400 | if (hsize > inline_size && !F2FS_I(inode)->i_xattr_nid) |
4d57b86d | 401 | if (!f2fs_alloc_nid(sbi, &new_nid)) |
65985d93 JK |
402 | return -ENOSPC; |
403 | ||
404 | /* write to inline xattr */ | |
405 | if (inline_size) { | |
65985d93 | 406 | if (ipage) { |
6afc662e | 407 | inline_addr = inline_xattr_addr(inode, ipage); |
65985d93 | 408 | } else { |
4d57b86d | 409 | in_page = f2fs_get_node_page(sbi, inode->i_ino); |
bf9c1427 | 410 | if (IS_ERR(in_page)) { |
4d57b86d | 411 | f2fs_alloc_nid_failed(sbi, new_nid); |
bf9c1427 | 412 | return PTR_ERR(in_page); |
65985d93 | 413 | } |
bf9c1427 | 414 | inline_addr = inline_xattr_addr(inode, in_page); |
65985d93 | 415 | } |
65985d93 | 416 | |
bf9c1427 JK |
417 | f2fs_wait_on_page_writeback(ipage ? ipage : in_page, |
418 | NODE, true); | |
65985d93 JK |
419 | /* no need to use xattr node block */ |
420 | if (hsize <= inline_size) { | |
4d57b86d CY |
421 | err = f2fs_truncate_xattr_node(inode); |
422 | f2fs_alloc_nid_failed(sbi, new_nid); | |
bf9c1427 JK |
423 | if (err) { |
424 | f2fs_put_page(in_page, 1); | |
425 | return err; | |
426 | } | |
427 | memcpy(inline_addr, txattr_addr, inline_size); | |
428 | set_page_dirty(ipage ? ipage : in_page); | |
429 | goto in_page_out; | |
65985d93 JK |
430 | } |
431 | } | |
432 | ||
433 | /* write to xattr node block */ | |
434 | if (F2FS_I(inode)->i_xattr_nid) { | |
4d57b86d | 435 | xpage = f2fs_get_node_page(sbi, F2FS_I(inode)->i_xattr_nid); |
65985d93 | 436 | if (IS_ERR(xpage)) { |
d620439f | 437 | err = PTR_ERR(xpage); |
4d57b86d | 438 | f2fs_alloc_nid_failed(sbi, new_nid); |
bf9c1427 | 439 | goto in_page_out; |
65985d93 | 440 | } |
9850cf4a | 441 | f2fs_bug_on(sbi, new_nid); |
fec1d657 | 442 | f2fs_wait_on_page_writeback(xpage, NODE, true); |
65985d93 JK |
443 | } else { |
444 | struct dnode_of_data dn; | |
445 | set_new_dnode(&dn, inode, NULL, NULL, new_nid); | |
4d57b86d | 446 | xpage = f2fs_new_node_page(&dn, XATTR_NODE_OFFSET); |
65985d93 | 447 | if (IS_ERR(xpage)) { |
d620439f | 448 | err = PTR_ERR(xpage); |
4d57b86d | 449 | f2fs_alloc_nid_failed(sbi, new_nid); |
bf9c1427 | 450 | goto in_page_out; |
65985d93 | 451 | } |
4d57b86d | 452 | f2fs_alloc_nid_done(sbi, new_nid); |
65985d93 | 453 | } |
65985d93 | 454 | xattr_addr = page_address(xpage); |
bf9c1427 JK |
455 | |
456 | if (inline_size) | |
457 | memcpy(inline_addr, txattr_addr, inline_size); | |
22588f87 | 458 | memcpy(xattr_addr, txattr_addr + inline_size, VALID_XATTR_BLOCK_SIZE); |
bf9c1427 JK |
459 | |
460 | if (inline_size) | |
461 | set_page_dirty(ipage ? ipage : in_page); | |
65985d93 | 462 | set_page_dirty(xpage); |
65985d93 | 463 | |
bf9c1427 JK |
464 | f2fs_put_page(xpage, 1); |
465 | in_page_out: | |
466 | f2fs_put_page(in_page, 1); | |
467 | return err; | |
65985d93 JK |
468 | } |
469 | ||
e1123268 | 470 | int f2fs_getxattr(struct inode *inode, int index, const char *name, |
bce8d112 | 471 | void *buffer, size_t buffer_size, struct page *ipage) |
af48b85b | 472 | { |
ba38c27e | 473 | struct f2fs_xattr_entry *entry = NULL; |
dd9cfe23 | 474 | int error = 0; |
ba38c27e | 475 | unsigned int size, len; |
ba38c27e | 476 | void *base_addr = NULL; |
af48b85b JK |
477 | |
478 | if (name == NULL) | |
479 | return -EINVAL; | |
e1123268 JK |
480 | |
481 | len = strlen(name); | |
482 | if (len > F2FS_NAME_LEN) | |
6e452d69 | 483 | return -ERANGE; |
af48b85b | 484 | |
27161f13 | 485 | down_read(&F2FS_I(inode)->i_xattr_sem); |
ba38c27e CY |
486 | error = lookup_all_xattrs(inode, ipage, index, len, name, |
487 | &entry, &base_addr); | |
27161f13 | 488 | up_read(&F2FS_I(inode)->i_xattr_sem); |
86696966 CY |
489 | if (error) |
490 | return error; | |
af48b85b | 491 | |
e1123268 | 492 | size = le16_to_cpu(entry->e_value_size); |
af48b85b | 493 | |
e1123268 | 494 | if (buffer && size > buffer_size) { |
af48b85b | 495 | error = -ERANGE; |
ba38c27e | 496 | goto out; |
af48b85b JK |
497 | } |
498 | ||
499 | if (buffer) { | |
500 | char *pval = entry->e_name + entry->e_name_len; | |
e1123268 | 501 | memcpy(buffer, pval, size); |
af48b85b | 502 | } |
e1123268 | 503 | error = size; |
ba38c27e | 504 | out: |
65985d93 | 505 | kzfree(base_addr); |
af48b85b JK |
506 | return error; |
507 | } | |
508 | ||
509 | ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) | |
510 | { | |
2b0143b5 | 511 | struct inode *inode = d_inode(dentry); |
af48b85b | 512 | struct f2fs_xattr_entry *entry; |
af48b85b JK |
513 | void *base_addr; |
514 | int error = 0; | |
515 | size_t rest = buffer_size; | |
516 | ||
27161f13 | 517 | down_read(&F2FS_I(inode)->i_xattr_sem); |
86696966 | 518 | error = read_all_xattrs(inode, NULL, &base_addr); |
27161f13 | 519 | up_read(&F2FS_I(inode)->i_xattr_sem); |
86696966 CY |
520 | if (error) |
521 | return error; | |
af48b85b JK |
522 | |
523 | list_for_each_xattr(entry, base_addr) { | |
524 | const struct xattr_handler *handler = | |
525 | f2fs_xattr_handler(entry->e_name_index); | |
764a5c6b AG |
526 | const char *prefix; |
527 | size_t prefix_len; | |
af48b85b JK |
528 | size_t size; |
529 | ||
764a5c6b | 530 | if (!handler || (handler->list && !handler->list(dentry))) |
af48b85b JK |
531 | continue; |
532 | ||
764a5c6b AG |
533 | prefix = handler->prefix ?: handler->name; |
534 | prefix_len = strlen(prefix); | |
535 | size = prefix_len + entry->e_name_len + 1; | |
536 | if (buffer) { | |
537 | if (size > rest) { | |
538 | error = -ERANGE; | |
539 | goto cleanup; | |
540 | } | |
541 | memcpy(buffer, prefix, prefix_len); | |
542 | buffer += prefix_len; | |
543 | memcpy(buffer, entry->e_name, entry->e_name_len); | |
544 | buffer += entry->e_name_len; | |
545 | *buffer++ = 0; | |
af48b85b | 546 | } |
af48b85b JK |
547 | rest -= size; |
548 | } | |
549 | error = buffer_size - rest; | |
550 | cleanup: | |
65985d93 | 551 | kzfree(base_addr); |
af48b85b JK |
552 | return error; |
553 | } | |
554 | ||
5f35a2cd KM |
555 | static bool f2fs_xattr_value_same(struct f2fs_xattr_entry *entry, |
556 | const void *value, size_t size) | |
557 | { | |
558 | void *pval = entry->e_name + entry->e_name_len; | |
b71deadb JK |
559 | |
560 | return (le16_to_cpu(entry->e_value_size) == size) && | |
561 | !memcmp(pval, value, size); | |
5f35a2cd KM |
562 | } |
563 | ||
e1123268 JK |
564 | static int __f2fs_setxattr(struct inode *inode, int index, |
565 | const char *name, const void *value, size_t size, | |
c02745ef | 566 | struct page *ipage, int flags) |
af48b85b | 567 | { |
af48b85b | 568 | struct f2fs_xattr_entry *here, *last; |
af48b85b | 569 | void *base_addr; |
65985d93 | 570 | int found, newsize; |
e1123268 | 571 | size_t len; |
65985d93 | 572 | __u32 new_hsize; |
a0995af6 | 573 | int error = 0; |
af48b85b JK |
574 | |
575 | if (name == NULL) | |
576 | return -EINVAL; | |
af48b85b JK |
577 | |
578 | if (value == NULL) | |
e1123268 | 579 | size = 0; |
af48b85b | 580 | |
e1123268 | 581 | len = strlen(name); |
7c909772 | 582 | |
037fe70c | 583 | if (len > F2FS_NAME_LEN) |
af48b85b JK |
584 | return -ERANGE; |
585 | ||
037fe70c CY |
586 | if (size > MAX_VALUE_LEN(inode)) |
587 | return -E2BIG; | |
588 | ||
86696966 CY |
589 | error = read_all_xattrs(inode, ipage, &base_addr); |
590 | if (error) | |
591 | return error; | |
af48b85b JK |
592 | |
593 | /* find entry with wanted name. */ | |
e1123268 | 594 | here = __find_xattr(base_addr, index, len, name); |
af48b85b | 595 | |
dd9cfe23 | 596 | found = IS_XATTR_LAST_ENTRY(here) ? 0 : 1; |
af48b85b | 597 | |
5f35a2cd KM |
598 | if (found) { |
599 | if ((flags & XATTR_CREATE)) { | |
600 | error = -EEXIST; | |
601 | goto exit; | |
602 | } | |
603 | ||
b2c4692b | 604 | if (value && f2fs_xattr_value_same(here, value, size)) |
5f35a2cd KM |
605 | goto exit; |
606 | } else if ((flags & XATTR_REPLACE)) { | |
916decbf JK |
607 | error = -ENODATA; |
608 | goto exit; | |
916decbf JK |
609 | } |
610 | ||
611 | last = here; | |
af48b85b JK |
612 | while (!IS_XATTR_LAST_ENTRY(last)) |
613 | last = XATTR_NEXT_ENTRY(last); | |
614 | ||
e1123268 | 615 | newsize = XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) + len + size); |
af48b85b JK |
616 | |
617 | /* 1. Check space */ | |
618 | if (value) { | |
65985d93 JK |
619 | int free; |
620 | /* | |
621 | * If value is NULL, it is remove operation. | |
e1c42045 | 622 | * In case of update operation, we calculate free. |
af48b85b | 623 | */ |
65985d93 | 624 | free = MIN_OFFSET(inode) - ((char *)last - (char *)base_addr); |
af48b85b | 625 | if (found) |
cc3de6a3 | 626 | free = free + ENTRY_SIZE(here); |
af48b85b | 627 | |
6bacf52f | 628 | if (unlikely(free < newsize)) { |
58457f1c | 629 | error = -E2BIG; |
65985d93 | 630 | goto exit; |
af48b85b JK |
631 | } |
632 | } | |
633 | ||
634 | /* 2. Remove old entry */ | |
635 | if (found) { | |
65985d93 JK |
636 | /* |
637 | * If entry is found, remove old entry. | |
af48b85b JK |
638 | * If not found, remove operation is not needed. |
639 | */ | |
640 | struct f2fs_xattr_entry *next = XATTR_NEXT_ENTRY(here); | |
641 | int oldsize = ENTRY_SIZE(here); | |
642 | ||
643 | memmove(here, next, (char *)last - (char *)next); | |
644 | last = (struct f2fs_xattr_entry *)((char *)last - oldsize); | |
645 | memset(last, 0, oldsize); | |
646 | } | |
647 | ||
65985d93 JK |
648 | new_hsize = (char *)last - (char *)base_addr; |
649 | ||
af48b85b JK |
650 | /* 3. Write new entry */ |
651 | if (value) { | |
65985d93 JK |
652 | char *pval; |
653 | /* | |
654 | * Before we come here, old entry is removed. | |
655 | * We just write new entry. | |
656 | */ | |
e1123268 JK |
657 | last->e_name_index = index; |
658 | last->e_name_len = len; | |
659 | memcpy(last->e_name, name, len); | |
660 | pval = last->e_name + len; | |
661 | memcpy(pval, value, size); | |
662 | last->e_value_size = cpu_to_le16(size); | |
65985d93 | 663 | new_hsize += newsize; |
af48b85b JK |
664 | } |
665 | ||
65985d93 JK |
666 | error = write_all_xattrs(inode, new_hsize, base_addr, ipage); |
667 | if (error) | |
668 | goto exit; | |
af48b85b | 669 | |
91942321 JK |
670 | if (is_inode_flag_set(inode, FI_ACL_MODE)) { |
671 | inode->i_mode = F2FS_I(inode)->i_acl_mode; | |
c2050a45 | 672 | inode->i_ctime = current_time(inode); |
91942321 | 673 | clear_inode_flag(inode, FI_ACL_MODE); |
af48b85b | 674 | } |
f424f664 JK |
675 | if (index == F2FS_XATTR_INDEX_ENCRYPTION && |
676 | !strcmp(name, F2FS_XATTR_NAME_ENCRYPTION_CONTEXT)) | |
677 | f2fs_set_encrypted_inode(inode); | |
7c45729a | 678 | f2fs_mark_inode_dirty_sync(inode, true); |
bbf156f7 JK |
679 | if (!error && S_ISDIR(inode->i_mode)) |
680 | set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_CP); | |
7c909772 | 681 | exit: |
65985d93 | 682 | kzfree(base_addr); |
af48b85b JK |
683 | return error; |
684 | } | |
52ab9560 | 685 | |
e1123268 JK |
686 | int f2fs_setxattr(struct inode *inode, int index, const char *name, |
687 | const void *value, size_t size, | |
c02745ef | 688 | struct page *ipage, int flags) |
52ab9560 | 689 | { |
4081363f | 690 | struct f2fs_sb_info *sbi = F2FS_I_SB(inode); |
52ab9560 RK |
691 | int err; |
692 | ||
d8d1389e JK |
693 | err = dquot_initialize(inode); |
694 | if (err) | |
695 | return err; | |
696 | ||
4d57b86d | 697 | /* this case is only from f2fs_init_inode_metadata */ |
d631abda JK |
698 | if (ipage) |
699 | return __f2fs_setxattr(inode, index, name, value, | |
700 | size, ipage, flags); | |
2c4db1a6 | 701 | f2fs_balance_fs(sbi, true); |
52ab9560 | 702 | |
e479556b | 703 | f2fs_lock_op(sbi); |
d928bfbf JK |
704 | /* protect xattr_ver */ |
705 | down_write(&F2FS_I(inode)->i_sem); | |
27161f13 | 706 | down_write(&F2FS_I(inode)->i_xattr_sem); |
c02745ef | 707 | err = __f2fs_setxattr(inode, index, name, value, size, ipage, flags); |
27161f13 | 708 | up_write(&F2FS_I(inode)->i_xattr_sem); |
d928bfbf | 709 | up_write(&F2FS_I(inode)->i_sem); |
e479556b | 710 | f2fs_unlock_op(sbi); |
52ab9560 | 711 | |
d0239e1b | 712 | f2fs_update_time(sbi, REQ_TIME); |
52ab9560 RK |
713 | return err; |
714 | } |