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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> | |
8ae8f162 | 23 | #include <linux/security.h> |
a6dda0e6 | 24 | #include <linux/posix_acl_xattr.h> |
af48b85b JK |
25 | #include "f2fs.h" |
26 | #include "xattr.h" | |
27 | ||
d9a82a04 | 28 | static int f2fs_xattr_generic_get(const struct xattr_handler *handler, |
b296821a AV |
29 | struct dentry *unused, struct inode *inode, |
30 | const char *name, void *buffer, size_t size) | |
af48b85b | 31 | { |
b296821a | 32 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); |
af48b85b | 33 | |
d9a82a04 | 34 | switch (handler->flags) { |
af48b85b JK |
35 | case F2FS_XATTR_INDEX_USER: |
36 | if (!test_opt(sbi, XATTR_USER)) | |
37 | return -EOPNOTSUPP; | |
38 | break; | |
39 | case F2FS_XATTR_INDEX_TRUSTED: | |
40 | if (!capable(CAP_SYS_ADMIN)) | |
41 | return -EPERM; | |
42 | break; | |
8ae8f162 JK |
43 | case F2FS_XATTR_INDEX_SECURITY: |
44 | break; | |
af48b85b JK |
45 | default: |
46 | return -EINVAL; | |
47 | } | |
b296821a | 48 | return f2fs_getxattr(inode, handler->flags, name, |
d9a82a04 | 49 | buffer, size, NULL); |
af48b85b JK |
50 | } |
51 | ||
d9a82a04 | 52 | static int f2fs_xattr_generic_set(const struct xattr_handler *handler, |
59301226 AV |
53 | struct dentry *unused, struct inode *inode, |
54 | const char *name, const void *value, | |
d9a82a04 | 55 | size_t size, int flags) |
af48b85b | 56 | { |
59301226 | 57 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); |
af48b85b | 58 | |
d9a82a04 | 59 | switch (handler->flags) { |
af48b85b JK |
60 | case F2FS_XATTR_INDEX_USER: |
61 | if (!test_opt(sbi, XATTR_USER)) | |
62 | return -EOPNOTSUPP; | |
63 | break; | |
64 | case F2FS_XATTR_INDEX_TRUSTED: | |
65 | if (!capable(CAP_SYS_ADMIN)) | |
66 | return -EPERM; | |
67 | break; | |
8ae8f162 JK |
68 | case F2FS_XATTR_INDEX_SECURITY: |
69 | break; | |
af48b85b JK |
70 | default: |
71 | return -EINVAL; | |
72 | } | |
59301226 | 73 | return f2fs_setxattr(inode, handler->flags, name, |
c02745ef | 74 | value, size, NULL, flags); |
af48b85b JK |
75 | } |
76 | ||
764a5c6b | 77 | static bool f2fs_xattr_user_list(struct dentry *dentry) |
573ea5fc | 78 | { |
764a5c6b AG |
79 | struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb); |
80 | ||
81 | return test_opt(sbi, XATTR_USER); | |
82 | } | |
573ea5fc | 83 | |
764a5c6b AG |
84 | static bool f2fs_xattr_trusted_list(struct dentry *dentry) |
85 | { | |
86 | return capable(CAP_SYS_ADMIN); | |
573ea5fc JK |
87 | } |
88 | ||
d9a82a04 | 89 | static int f2fs_xattr_advise_get(const struct xattr_handler *handler, |
b296821a AV |
90 | struct dentry *unused, struct inode *inode, |
91 | const char *name, void *buffer, size_t size) | |
573ea5fc | 92 | { |
84e97c27 CY |
93 | if (buffer) |
94 | *((char *)buffer) = F2FS_I(inode)->i_advise; | |
573ea5fc JK |
95 | return sizeof(char); |
96 | } | |
97 | ||
d9a82a04 | 98 | static int f2fs_xattr_advise_set(const struct xattr_handler *handler, |
59301226 AV |
99 | struct dentry *unused, struct inode *inode, |
100 | const char *name, const void *value, | |
d9a82a04 | 101 | size_t size, int flags) |
573ea5fc | 102 | { |
573ea5fc JK |
103 | if (!inode_owner_or_capable(inode)) |
104 | return -EPERM; | |
105 | if (value == NULL) | |
106 | return -EINVAL; | |
107 | ||
108 | F2FS_I(inode)->i_advise |= *(char *)value; | |
7c45729a | 109 | f2fs_mark_inode_dirty_sync(inode, true); |
573ea5fc JK |
110 | return 0; |
111 | } | |
112 | ||
8ae8f162 JK |
113 | #ifdef CONFIG_F2FS_FS_SECURITY |
114 | static int f2fs_initxattrs(struct inode *inode, const struct xattr *xattr_array, | |
115 | void *page) | |
116 | { | |
117 | const struct xattr *xattr; | |
118 | int err = 0; | |
119 | ||
120 | for (xattr = xattr_array; xattr->name != NULL; xattr++) { | |
d631abda | 121 | err = f2fs_setxattr(inode, F2FS_XATTR_INDEX_SECURITY, |
8ae8f162 | 122 | xattr->name, xattr->value, |
c02745ef | 123 | xattr->value_len, (struct page *)page, 0); |
8ae8f162 JK |
124 | if (err < 0) |
125 | break; | |
126 | } | |
127 | return err; | |
128 | } | |
129 | ||
130 | int f2fs_init_security(struct inode *inode, struct inode *dir, | |
131 | const struct qstr *qstr, struct page *ipage) | |
132 | { | |
133 | return security_inode_init_security(inode, dir, qstr, | |
134 | &f2fs_initxattrs, ipage); | |
135 | } | |
136 | #endif | |
137 | ||
af48b85b JK |
138 | const struct xattr_handler f2fs_xattr_user_handler = { |
139 | .prefix = XATTR_USER_PREFIX, | |
140 | .flags = F2FS_XATTR_INDEX_USER, | |
764a5c6b | 141 | .list = f2fs_xattr_user_list, |
af48b85b JK |
142 | .get = f2fs_xattr_generic_get, |
143 | .set = f2fs_xattr_generic_set, | |
144 | }; | |
145 | ||
146 | const struct xattr_handler f2fs_xattr_trusted_handler = { | |
147 | .prefix = XATTR_TRUSTED_PREFIX, | |
148 | .flags = F2FS_XATTR_INDEX_TRUSTED, | |
764a5c6b | 149 | .list = f2fs_xattr_trusted_list, |
af48b85b JK |
150 | .get = f2fs_xattr_generic_get, |
151 | .set = f2fs_xattr_generic_set, | |
152 | }; | |
153 | ||
573ea5fc | 154 | const struct xattr_handler f2fs_xattr_advise_handler = { |
98e9cb57 | 155 | .name = F2FS_SYSTEM_ADVISE_NAME, |
573ea5fc | 156 | .flags = F2FS_XATTR_INDEX_ADVISE, |
573ea5fc JK |
157 | .get = f2fs_xattr_advise_get, |
158 | .set = f2fs_xattr_advise_set, | |
159 | }; | |
160 | ||
8ae8f162 JK |
161 | const struct xattr_handler f2fs_xattr_security_handler = { |
162 | .prefix = XATTR_SECURITY_PREFIX, | |
163 | .flags = F2FS_XATTR_INDEX_SECURITY, | |
8ae8f162 JK |
164 | .get = f2fs_xattr_generic_get, |
165 | .set = f2fs_xattr_generic_set, | |
166 | }; | |
167 | ||
af48b85b JK |
168 | static const struct xattr_handler *f2fs_xattr_handler_map[] = { |
169 | [F2FS_XATTR_INDEX_USER] = &f2fs_xattr_user_handler, | |
170 | #ifdef CONFIG_F2FS_FS_POSIX_ACL | |
a6dda0e6 CH |
171 | [F2FS_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler, |
172 | [F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler, | |
af48b85b JK |
173 | #endif |
174 | [F2FS_XATTR_INDEX_TRUSTED] = &f2fs_xattr_trusted_handler, | |
8ae8f162 JK |
175 | #ifdef CONFIG_F2FS_FS_SECURITY |
176 | [F2FS_XATTR_INDEX_SECURITY] = &f2fs_xattr_security_handler, | |
177 | #endif | |
af48b85b JK |
178 | [F2FS_XATTR_INDEX_ADVISE] = &f2fs_xattr_advise_handler, |
179 | }; | |
180 | ||
181 | const struct xattr_handler *f2fs_xattr_handlers[] = { | |
182 | &f2fs_xattr_user_handler, | |
183 | #ifdef CONFIG_F2FS_FS_POSIX_ACL | |
a6dda0e6 CH |
184 | &posix_acl_access_xattr_handler, |
185 | &posix_acl_default_xattr_handler, | |
af48b85b JK |
186 | #endif |
187 | &f2fs_xattr_trusted_handler, | |
8ae8f162 JK |
188 | #ifdef CONFIG_F2FS_FS_SECURITY |
189 | &f2fs_xattr_security_handler, | |
190 | #endif | |
af48b85b JK |
191 | &f2fs_xattr_advise_handler, |
192 | NULL, | |
193 | }; | |
194 | ||
e1123268 | 195 | static inline const struct xattr_handler *f2fs_xattr_handler(int index) |
af48b85b JK |
196 | { |
197 | const struct xattr_handler *handler = NULL; | |
198 | ||
e1123268 JK |
199 | if (index > 0 && index < ARRAY_SIZE(f2fs_xattr_handler_map)) |
200 | handler = f2fs_xattr_handler_map[index]; | |
af48b85b JK |
201 | return handler; |
202 | } | |
203 | ||
e1123268 JK |
204 | static struct f2fs_xattr_entry *__find_xattr(void *base_addr, int index, |
205 | size_t len, const char *name) | |
dd9cfe23 JK |
206 | { |
207 | struct f2fs_xattr_entry *entry; | |
208 | ||
209 | list_for_each_xattr(entry, base_addr) { | |
e1123268 | 210 | if (entry->e_name_index != index) |
dd9cfe23 | 211 | continue; |
e1123268 | 212 | if (entry->e_name_len != len) |
dd9cfe23 | 213 | continue; |
e1123268 | 214 | if (!memcmp(entry->e_name, name, len)) |
dd9cfe23 JK |
215 | break; |
216 | } | |
217 | return entry; | |
218 | } | |
219 | ||
ba38c27e CY |
220 | static struct f2fs_xattr_entry *__find_inline_xattr(void *base_addr, |
221 | void **last_addr, int index, | |
222 | size_t len, const char *name) | |
223 | { | |
224 | struct f2fs_xattr_entry *entry; | |
225 | unsigned int inline_size = F2FS_INLINE_XATTR_ADDRS << 2; | |
226 | ||
227 | list_for_each_xattr(entry, base_addr) { | |
228 | if ((void *)entry + sizeof(__u32) > base_addr + inline_size || | |
229 | (void *)XATTR_NEXT_ENTRY(entry) + sizeof(__u32) > | |
230 | base_addr + inline_size) { | |
231 | *last_addr = entry; | |
232 | return NULL; | |
233 | } | |
234 | if (entry->e_name_index != index) | |
235 | continue; | |
236 | if (entry->e_name_len != len) | |
237 | continue; | |
238 | if (!memcmp(entry->e_name, name, len)) | |
239 | break; | |
240 | } | |
241 | return entry; | |
242 | } | |
243 | ||
244 | static int lookup_all_xattrs(struct inode *inode, struct page *ipage, | |
245 | unsigned int index, unsigned int len, | |
246 | const char *name, struct f2fs_xattr_entry **xe, | |
247 | void **base_addr) | |
248 | { | |
249 | struct f2fs_sb_info *sbi = F2FS_I_SB(inode); | |
250 | void *cur_addr, *txattr_addr, *last_addr = NULL; | |
251 | nid_t xnid = F2FS_I(inode)->i_xattr_nid; | |
252 | unsigned int size = xnid ? VALID_XATTR_BLOCK_SIZE : 0; | |
89e9eabd | 253 | unsigned int inline_size = inline_xattr_size(inode); |
ba38c27e CY |
254 | int err = 0; |
255 | ||
ba38c27e CY |
256 | if (!size && !inline_size) |
257 | return -ENODATA; | |
258 | ||
22588f87 | 259 | txattr_addr = kzalloc(inline_size + size + XATTR_PADDING_SIZE, |
ba38c27e CY |
260 | GFP_F2FS_ZERO); |
261 | if (!txattr_addr) | |
262 | return -ENOMEM; | |
263 | ||
264 | /* read from inline xattr */ | |
265 | if (inline_size) { | |
266 | struct page *page = NULL; | |
267 | void *inline_addr; | |
268 | ||
269 | if (ipage) { | |
270 | inline_addr = inline_xattr_addr(ipage); | |
271 | } else { | |
272 | page = get_node_page(sbi, inode->i_ino); | |
273 | if (IS_ERR(page)) { | |
274 | err = PTR_ERR(page); | |
275 | goto out; | |
276 | } | |
277 | inline_addr = inline_xattr_addr(page); | |
278 | } | |
279 | memcpy(txattr_addr, inline_addr, inline_size); | |
280 | f2fs_put_page(page, 1); | |
281 | ||
282 | *xe = __find_inline_xattr(txattr_addr, &last_addr, | |
283 | index, len, name); | |
284 | if (*xe) | |
285 | goto check; | |
286 | } | |
287 | ||
288 | /* read from xattr node block */ | |
289 | if (xnid) { | |
290 | struct page *xpage; | |
291 | void *xattr_addr; | |
292 | ||
293 | /* The inode already has an extended attribute block. */ | |
294 | xpage = get_node_page(sbi, xnid); | |
295 | if (IS_ERR(xpage)) { | |
296 | err = PTR_ERR(xpage); | |
297 | goto out; | |
298 | } | |
299 | ||
300 | xattr_addr = page_address(xpage); | |
301 | memcpy(txattr_addr + inline_size, xattr_addr, size); | |
302 | f2fs_put_page(xpage, 1); | |
303 | } | |
304 | ||
305 | if (last_addr) | |
306 | cur_addr = XATTR_HDR(last_addr) - 1; | |
307 | else | |
308 | cur_addr = txattr_addr; | |
309 | ||
310 | *xe = __find_xattr(cur_addr, index, len, name); | |
311 | check: | |
312 | if (IS_XATTR_LAST_ENTRY(*xe)) { | |
313 | err = -ENODATA; | |
314 | goto out; | |
315 | } | |
316 | ||
317 | *base_addr = txattr_addr; | |
318 | return 0; | |
319 | out: | |
320 | kzfree(txattr_addr); | |
321 | return err; | |
322 | } | |
323 | ||
86696966 CY |
324 | static int read_all_xattrs(struct inode *inode, struct page *ipage, |
325 | void **base_addr) | |
65985d93 | 326 | { |
4081363f | 327 | struct f2fs_sb_info *sbi = F2FS_I_SB(inode); |
65985d93 | 328 | struct f2fs_xattr_header *header; |
89e9eabd CY |
329 | nid_t xnid = F2FS_I(inode)->i_xattr_nid; |
330 | unsigned int size = VALID_XATTR_BLOCK_SIZE; | |
331 | unsigned int inline_size = inline_xattr_size(inode); | |
65985d93 | 332 | void *txattr_addr; |
86696966 | 333 | int err; |
65985d93 | 334 | |
22588f87 | 335 | txattr_addr = kzalloc(inline_size + size + XATTR_PADDING_SIZE, |
89e9eabd | 336 | GFP_F2FS_ZERO); |
65985d93 | 337 | if (!txattr_addr) |
86696966 | 338 | return -ENOMEM; |
65985d93 JK |
339 | |
340 | /* read from inline xattr */ | |
341 | if (inline_size) { | |
342 | struct page *page = NULL; | |
343 | void *inline_addr; | |
344 | ||
345 | if (ipage) { | |
346 | inline_addr = inline_xattr_addr(ipage); | |
347 | } else { | |
348 | page = get_node_page(sbi, inode->i_ino); | |
86696966 CY |
349 | if (IS_ERR(page)) { |
350 | err = PTR_ERR(page); | |
65985d93 | 351 | goto fail; |
86696966 | 352 | } |
65985d93 JK |
353 | inline_addr = inline_xattr_addr(page); |
354 | } | |
355 | memcpy(txattr_addr, inline_addr, inline_size); | |
356 | f2fs_put_page(page, 1); | |
357 | } | |
358 | ||
359 | /* read from xattr node block */ | |
89e9eabd | 360 | if (xnid) { |
65985d93 JK |
361 | struct page *xpage; |
362 | void *xattr_addr; | |
363 | ||
364 | /* The inode already has an extended attribute block. */ | |
89e9eabd | 365 | xpage = get_node_page(sbi, xnid); |
86696966 CY |
366 | if (IS_ERR(xpage)) { |
367 | err = PTR_ERR(xpage); | |
65985d93 | 368 | goto fail; |
86696966 | 369 | } |
65985d93 JK |
370 | |
371 | xattr_addr = page_address(xpage); | |
89e9eabd | 372 | memcpy(txattr_addr + inline_size, xattr_addr, size); |
65985d93 JK |
373 | f2fs_put_page(xpage, 1); |
374 | } | |
375 | ||
376 | header = XATTR_HDR(txattr_addr); | |
377 | ||
378 | /* never been allocated xattrs */ | |
379 | if (le32_to_cpu(header->h_magic) != F2FS_XATTR_MAGIC) { | |
380 | header->h_magic = cpu_to_le32(F2FS_XATTR_MAGIC); | |
381 | header->h_refcount = cpu_to_le32(1); | |
382 | } | |
86696966 CY |
383 | *base_addr = txattr_addr; |
384 | return 0; | |
65985d93 JK |
385 | fail: |
386 | kzfree(txattr_addr); | |
86696966 | 387 | return err; |
65985d93 JK |
388 | } |
389 | ||
390 | static inline int write_all_xattrs(struct inode *inode, __u32 hsize, | |
391 | void *txattr_addr, struct page *ipage) | |
392 | { | |
4081363f | 393 | struct f2fs_sb_info *sbi = F2FS_I_SB(inode); |
89e9eabd | 394 | size_t inline_size = inline_xattr_size(inode); |
65985d93 JK |
395 | void *xattr_addr; |
396 | struct page *xpage; | |
397 | nid_t new_nid = 0; | |
398 | int err; | |
399 | ||
65985d93 JK |
400 | if (hsize > inline_size && !F2FS_I(inode)->i_xattr_nid) |
401 | if (!alloc_nid(sbi, &new_nid)) | |
402 | return -ENOSPC; | |
403 | ||
404 | /* write to inline xattr */ | |
405 | if (inline_size) { | |
406 | struct page *page = NULL; | |
407 | void *inline_addr; | |
408 | ||
409 | if (ipage) { | |
410 | inline_addr = inline_xattr_addr(ipage); | |
fec1d657 | 411 | f2fs_wait_on_page_writeback(ipage, NODE, true); |
ee6d182f | 412 | set_page_dirty(ipage); |
65985d93 JK |
413 | } else { |
414 | page = get_node_page(sbi, inode->i_ino); | |
415 | if (IS_ERR(page)) { | |
416 | alloc_nid_failed(sbi, new_nid); | |
417 | return PTR_ERR(page); | |
418 | } | |
419 | inline_addr = inline_xattr_addr(page); | |
fec1d657 | 420 | f2fs_wait_on_page_writeback(page, NODE, true); |
65985d93 JK |
421 | } |
422 | memcpy(inline_addr, txattr_addr, inline_size); | |
423 | f2fs_put_page(page, 1); | |
424 | ||
425 | /* no need to use xattr node block */ | |
426 | if (hsize <= inline_size) { | |
427 | err = truncate_xattr_node(inode, ipage); | |
428 | alloc_nid_failed(sbi, new_nid); | |
429 | return err; | |
430 | } | |
431 | } | |
432 | ||
433 | /* write to xattr node block */ | |
434 | if (F2FS_I(inode)->i_xattr_nid) { | |
435 | xpage = get_node_page(sbi, F2FS_I(inode)->i_xattr_nid); | |
436 | if (IS_ERR(xpage)) { | |
437 | alloc_nid_failed(sbi, new_nid); | |
438 | return PTR_ERR(xpage); | |
439 | } | |
9850cf4a | 440 | f2fs_bug_on(sbi, new_nid); |
fec1d657 | 441 | f2fs_wait_on_page_writeback(xpage, NODE, true); |
65985d93 JK |
442 | } else { |
443 | struct dnode_of_data dn; | |
444 | set_new_dnode(&dn, inode, NULL, NULL, new_nid); | |
445 | xpage = new_node_page(&dn, XATTR_NODE_OFFSET, ipage); | |
446 | if (IS_ERR(xpage)) { | |
447 | alloc_nid_failed(sbi, new_nid); | |
448 | return PTR_ERR(xpage); | |
449 | } | |
450 | alloc_nid_done(sbi, new_nid); | |
451 | } | |
452 | ||
453 | xattr_addr = page_address(xpage); | |
22588f87 | 454 | memcpy(xattr_addr, txattr_addr + inline_size, VALID_XATTR_BLOCK_SIZE); |
65985d93 JK |
455 | set_page_dirty(xpage); |
456 | f2fs_put_page(xpage, 1); | |
457 | ||
65985d93 JK |
458 | return 0; |
459 | } | |
460 | ||
e1123268 | 461 | int f2fs_getxattr(struct inode *inode, int index, const char *name, |
bce8d112 | 462 | void *buffer, size_t buffer_size, struct page *ipage) |
af48b85b | 463 | { |
ba38c27e | 464 | struct f2fs_xattr_entry *entry = NULL; |
dd9cfe23 | 465 | int error = 0; |
ba38c27e | 466 | unsigned int size, len; |
ba38c27e | 467 | void *base_addr = NULL; |
af48b85b JK |
468 | |
469 | if (name == NULL) | |
470 | return -EINVAL; | |
e1123268 JK |
471 | |
472 | len = strlen(name); | |
473 | if (len > F2FS_NAME_LEN) | |
6e452d69 | 474 | return -ERANGE; |
af48b85b | 475 | |
ba38c27e CY |
476 | error = lookup_all_xattrs(inode, ipage, index, len, name, |
477 | &entry, &base_addr); | |
86696966 CY |
478 | if (error) |
479 | return error; | |
af48b85b | 480 | |
e1123268 | 481 | size = le16_to_cpu(entry->e_value_size); |
af48b85b | 482 | |
e1123268 | 483 | if (buffer && size > buffer_size) { |
af48b85b | 484 | error = -ERANGE; |
ba38c27e | 485 | goto out; |
af48b85b JK |
486 | } |
487 | ||
488 | if (buffer) { | |
489 | char *pval = entry->e_name + entry->e_name_len; | |
e1123268 | 490 | memcpy(buffer, pval, size); |
af48b85b | 491 | } |
e1123268 | 492 | error = size; |
ba38c27e | 493 | out: |
65985d93 | 494 | kzfree(base_addr); |
af48b85b JK |
495 | return error; |
496 | } | |
497 | ||
498 | ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) | |
499 | { | |
2b0143b5 | 500 | struct inode *inode = d_inode(dentry); |
af48b85b | 501 | struct f2fs_xattr_entry *entry; |
af48b85b JK |
502 | void *base_addr; |
503 | int error = 0; | |
504 | size_t rest = buffer_size; | |
505 | ||
86696966 CY |
506 | error = read_all_xattrs(inode, NULL, &base_addr); |
507 | if (error) | |
508 | return error; | |
af48b85b JK |
509 | |
510 | list_for_each_xattr(entry, base_addr) { | |
511 | const struct xattr_handler *handler = | |
512 | f2fs_xattr_handler(entry->e_name_index); | |
764a5c6b AG |
513 | const char *prefix; |
514 | size_t prefix_len; | |
af48b85b JK |
515 | size_t size; |
516 | ||
764a5c6b | 517 | if (!handler || (handler->list && !handler->list(dentry))) |
af48b85b JK |
518 | continue; |
519 | ||
764a5c6b AG |
520 | prefix = handler->prefix ?: handler->name; |
521 | prefix_len = strlen(prefix); | |
522 | size = prefix_len + entry->e_name_len + 1; | |
523 | if (buffer) { | |
524 | if (size > rest) { | |
525 | error = -ERANGE; | |
526 | goto cleanup; | |
527 | } | |
528 | memcpy(buffer, prefix, prefix_len); | |
529 | buffer += prefix_len; | |
530 | memcpy(buffer, entry->e_name, entry->e_name_len); | |
531 | buffer += entry->e_name_len; | |
532 | *buffer++ = 0; | |
af48b85b | 533 | } |
af48b85b JK |
534 | rest -= size; |
535 | } | |
536 | error = buffer_size - rest; | |
537 | cleanup: | |
65985d93 | 538 | kzfree(base_addr); |
af48b85b JK |
539 | return error; |
540 | } | |
541 | ||
5f35a2cd KM |
542 | static bool f2fs_xattr_value_same(struct f2fs_xattr_entry *entry, |
543 | const void *value, size_t size) | |
544 | { | |
545 | void *pval = entry->e_name + entry->e_name_len; | |
b71deadb JK |
546 | |
547 | return (le16_to_cpu(entry->e_value_size) == size) && | |
548 | !memcmp(pval, value, size); | |
5f35a2cd KM |
549 | } |
550 | ||
e1123268 JK |
551 | static int __f2fs_setxattr(struct inode *inode, int index, |
552 | const char *name, const void *value, size_t size, | |
c02745ef | 553 | struct page *ipage, int flags) |
af48b85b | 554 | { |
af48b85b | 555 | struct f2fs_xattr_entry *here, *last; |
af48b85b | 556 | void *base_addr; |
65985d93 | 557 | int found, newsize; |
e1123268 | 558 | size_t len; |
65985d93 | 559 | __u32 new_hsize; |
a0995af6 | 560 | int error = 0; |
af48b85b JK |
561 | |
562 | if (name == NULL) | |
563 | return -EINVAL; | |
af48b85b JK |
564 | |
565 | if (value == NULL) | |
e1123268 | 566 | size = 0; |
af48b85b | 567 | |
e1123268 | 568 | len = strlen(name); |
7c909772 | 569 | |
037fe70c | 570 | if (len > F2FS_NAME_LEN) |
af48b85b JK |
571 | return -ERANGE; |
572 | ||
037fe70c CY |
573 | if (size > MAX_VALUE_LEN(inode)) |
574 | return -E2BIG; | |
575 | ||
86696966 CY |
576 | error = read_all_xattrs(inode, ipage, &base_addr); |
577 | if (error) | |
578 | return error; | |
af48b85b JK |
579 | |
580 | /* find entry with wanted name. */ | |
e1123268 | 581 | here = __find_xattr(base_addr, index, len, name); |
af48b85b | 582 | |
dd9cfe23 | 583 | found = IS_XATTR_LAST_ENTRY(here) ? 0 : 1; |
af48b85b | 584 | |
5f35a2cd KM |
585 | if (found) { |
586 | if ((flags & XATTR_CREATE)) { | |
587 | error = -EEXIST; | |
588 | goto exit; | |
589 | } | |
590 | ||
591 | if (f2fs_xattr_value_same(here, value, size)) | |
592 | goto exit; | |
593 | } else if ((flags & XATTR_REPLACE)) { | |
916decbf JK |
594 | error = -ENODATA; |
595 | goto exit; | |
916decbf JK |
596 | } |
597 | ||
598 | last = here; | |
af48b85b JK |
599 | while (!IS_XATTR_LAST_ENTRY(last)) |
600 | last = XATTR_NEXT_ENTRY(last); | |
601 | ||
e1123268 | 602 | newsize = XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) + len + size); |
af48b85b JK |
603 | |
604 | /* 1. Check space */ | |
605 | if (value) { | |
65985d93 JK |
606 | int free; |
607 | /* | |
608 | * If value is NULL, it is remove operation. | |
e1c42045 | 609 | * In case of update operation, we calculate free. |
af48b85b | 610 | */ |
65985d93 | 611 | free = MIN_OFFSET(inode) - ((char *)last - (char *)base_addr); |
af48b85b | 612 | if (found) |
cc3de6a3 | 613 | free = free + ENTRY_SIZE(here); |
af48b85b | 614 | |
6bacf52f | 615 | if (unlikely(free < newsize)) { |
58457f1c | 616 | error = -E2BIG; |
65985d93 | 617 | goto exit; |
af48b85b JK |
618 | } |
619 | } | |
620 | ||
621 | /* 2. Remove old entry */ | |
622 | if (found) { | |
65985d93 JK |
623 | /* |
624 | * If entry is found, remove old entry. | |
af48b85b JK |
625 | * If not found, remove operation is not needed. |
626 | */ | |
627 | struct f2fs_xattr_entry *next = XATTR_NEXT_ENTRY(here); | |
628 | int oldsize = ENTRY_SIZE(here); | |
629 | ||
630 | memmove(here, next, (char *)last - (char *)next); | |
631 | last = (struct f2fs_xattr_entry *)((char *)last - oldsize); | |
632 | memset(last, 0, oldsize); | |
633 | } | |
634 | ||
65985d93 JK |
635 | new_hsize = (char *)last - (char *)base_addr; |
636 | ||
af48b85b JK |
637 | /* 3. Write new entry */ |
638 | if (value) { | |
65985d93 JK |
639 | char *pval; |
640 | /* | |
641 | * Before we come here, old entry is removed. | |
642 | * We just write new entry. | |
643 | */ | |
e1123268 JK |
644 | last->e_name_index = index; |
645 | last->e_name_len = len; | |
646 | memcpy(last->e_name, name, len); | |
647 | pval = last->e_name + len; | |
648 | memcpy(pval, value, size); | |
649 | last->e_value_size = cpu_to_le16(size); | |
65985d93 | 650 | new_hsize += newsize; |
af48b85b JK |
651 | } |
652 | ||
65985d93 JK |
653 | error = write_all_xattrs(inode, new_hsize, base_addr, ipage); |
654 | if (error) | |
655 | goto exit; | |
af48b85b | 656 | |
91942321 JK |
657 | if (is_inode_flag_set(inode, FI_ACL_MODE)) { |
658 | inode->i_mode = F2FS_I(inode)->i_acl_mode; | |
c2050a45 | 659 | inode->i_ctime = current_time(inode); |
91942321 | 660 | clear_inode_flag(inode, FI_ACL_MODE); |
af48b85b | 661 | } |
f424f664 JK |
662 | if (index == F2FS_XATTR_INDEX_ENCRYPTION && |
663 | !strcmp(name, F2FS_XATTR_NAME_ENCRYPTION_CONTEXT)) | |
664 | f2fs_set_encrypted_inode(inode); | |
7c45729a | 665 | f2fs_mark_inode_dirty_sync(inode, true); |
bbf156f7 JK |
666 | if (!error && S_ISDIR(inode->i_mode)) |
667 | set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_CP); | |
7c909772 | 668 | exit: |
65985d93 | 669 | kzfree(base_addr); |
af48b85b JK |
670 | return error; |
671 | } | |
52ab9560 | 672 | |
e1123268 JK |
673 | int f2fs_setxattr(struct inode *inode, int index, const char *name, |
674 | const void *value, size_t size, | |
c02745ef | 675 | struct page *ipage, int flags) |
52ab9560 | 676 | { |
4081363f | 677 | struct f2fs_sb_info *sbi = F2FS_I_SB(inode); |
52ab9560 RK |
678 | int err; |
679 | ||
d631abda JK |
680 | /* this case is only from init_inode_metadata */ |
681 | if (ipage) | |
682 | return __f2fs_setxattr(inode, index, name, value, | |
683 | size, ipage, flags); | |
2c4db1a6 | 684 | f2fs_balance_fs(sbi, true); |
52ab9560 | 685 | |
e479556b | 686 | f2fs_lock_op(sbi); |
d928bfbf JK |
687 | /* protect xattr_ver */ |
688 | down_write(&F2FS_I(inode)->i_sem); | |
c02745ef | 689 | err = __f2fs_setxattr(inode, index, name, value, size, ipage, flags); |
d928bfbf | 690 | up_write(&F2FS_I(inode)->i_sem); |
e479556b | 691 | f2fs_unlock_op(sbi); |
52ab9560 | 692 | |
d0239e1b | 693 | f2fs_update_time(sbi, REQ_TIME); |
52ab9560 RK |
694 | return err; |
695 | } |