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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 AG |
28 | static size_t f2fs_xattr_generic_list(const struct xattr_handler *handler, |
29 | struct dentry *dentry, char *list, size_t list_size, | |
30 | const char *name, size_t len) | |
af48b85b JK |
31 | { |
32 | struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb); | |
33 | int total_len, prefix_len = 0; | |
34 | const char *prefix = NULL; | |
35 | ||
d9a82a04 | 36 | switch (handler->flags) { |
af48b85b JK |
37 | case F2FS_XATTR_INDEX_USER: |
38 | if (!test_opt(sbi, XATTR_USER)) | |
39 | return -EOPNOTSUPP; | |
40 | prefix = XATTR_USER_PREFIX; | |
41 | prefix_len = XATTR_USER_PREFIX_LEN; | |
42 | break; | |
43 | case F2FS_XATTR_INDEX_TRUSTED: | |
44 | if (!capable(CAP_SYS_ADMIN)) | |
45 | return -EPERM; | |
46 | prefix = XATTR_TRUSTED_PREFIX; | |
47 | prefix_len = XATTR_TRUSTED_PREFIX_LEN; | |
48 | break; | |
8ae8f162 JK |
49 | case F2FS_XATTR_INDEX_SECURITY: |
50 | prefix = XATTR_SECURITY_PREFIX; | |
51 | prefix_len = XATTR_SECURITY_PREFIX_LEN; | |
52 | break; | |
af48b85b JK |
53 | default: |
54 | return -EINVAL; | |
55 | } | |
56 | ||
e1123268 | 57 | total_len = prefix_len + len + 1; |
af48b85b JK |
58 | if (list && total_len <= list_size) { |
59 | memcpy(list, prefix, prefix_len); | |
e1123268 JK |
60 | memcpy(list + prefix_len, name, len); |
61 | list[prefix_len + len] = '\0'; | |
af48b85b JK |
62 | } |
63 | return total_len; | |
64 | } | |
65 | ||
d9a82a04 AG |
66 | static int f2fs_xattr_generic_get(const struct xattr_handler *handler, |
67 | struct dentry *dentry, const char *name, void *buffer, | |
68 | size_t size) | |
af48b85b JK |
69 | { |
70 | struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb); | |
71 | ||
d9a82a04 | 72 | switch (handler->flags) { |
af48b85b JK |
73 | case F2FS_XATTR_INDEX_USER: |
74 | if (!test_opt(sbi, XATTR_USER)) | |
75 | return -EOPNOTSUPP; | |
76 | break; | |
77 | case F2FS_XATTR_INDEX_TRUSTED: | |
78 | if (!capable(CAP_SYS_ADMIN)) | |
79 | return -EPERM; | |
80 | break; | |
8ae8f162 JK |
81 | case F2FS_XATTR_INDEX_SECURITY: |
82 | break; | |
af48b85b JK |
83 | default: |
84 | return -EINVAL; | |
85 | } | |
86 | if (strcmp(name, "") == 0) | |
87 | return -EINVAL; | |
d9a82a04 AG |
88 | return f2fs_getxattr(d_inode(dentry), handler->flags, name, |
89 | buffer, size, NULL); | |
af48b85b JK |
90 | } |
91 | ||
d9a82a04 AG |
92 | static int f2fs_xattr_generic_set(const struct xattr_handler *handler, |
93 | struct dentry *dentry, const char *name, const void *value, | |
94 | size_t size, int flags) | |
af48b85b JK |
95 | { |
96 | struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb); | |
97 | ||
d9a82a04 | 98 | switch (handler->flags) { |
af48b85b JK |
99 | case F2FS_XATTR_INDEX_USER: |
100 | if (!test_opt(sbi, XATTR_USER)) | |
101 | return -EOPNOTSUPP; | |
102 | break; | |
103 | case F2FS_XATTR_INDEX_TRUSTED: | |
104 | if (!capable(CAP_SYS_ADMIN)) | |
105 | return -EPERM; | |
106 | break; | |
8ae8f162 JK |
107 | case F2FS_XATTR_INDEX_SECURITY: |
108 | break; | |
af48b85b JK |
109 | default: |
110 | return -EINVAL; | |
111 | } | |
112 | if (strcmp(name, "") == 0) | |
113 | return -EINVAL; | |
114 | ||
d9a82a04 | 115 | return f2fs_setxattr(d_inode(dentry), handler->flags, name, |
c02745ef | 116 | value, size, NULL, flags); |
af48b85b JK |
117 | } |
118 | ||
d9a82a04 AG |
119 | static size_t f2fs_xattr_advise_list(const struct xattr_handler *handler, |
120 | struct dentry *dentry, char *list, size_t list_size, | |
121 | const char *name, size_t len) | |
573ea5fc JK |
122 | { |
123 | const char *xname = F2FS_SYSTEM_ADVISE_PREFIX; | |
124 | size_t size; | |
125 | ||
d9a82a04 | 126 | if (handler->flags != F2FS_XATTR_INDEX_ADVISE) |
573ea5fc JK |
127 | return 0; |
128 | ||
129 | size = strlen(xname) + 1; | |
130 | if (list && size <= list_size) | |
131 | memcpy(list, xname, size); | |
132 | return size; | |
133 | } | |
134 | ||
d9a82a04 AG |
135 | static int f2fs_xattr_advise_get(const struct xattr_handler *handler, |
136 | struct dentry *dentry, const char *name, void *buffer, | |
137 | size_t size) | |
573ea5fc | 138 | { |
2b0143b5 | 139 | struct inode *inode = d_inode(dentry); |
573ea5fc JK |
140 | |
141 | if (strcmp(name, "") != 0) | |
142 | return -EINVAL; | |
143 | ||
84e97c27 CY |
144 | if (buffer) |
145 | *((char *)buffer) = F2FS_I(inode)->i_advise; | |
573ea5fc JK |
146 | return sizeof(char); |
147 | } | |
148 | ||
d9a82a04 AG |
149 | static int f2fs_xattr_advise_set(const struct xattr_handler *handler, |
150 | struct dentry *dentry, const char *name, const void *value, | |
151 | size_t size, int flags) | |
573ea5fc | 152 | { |
2b0143b5 | 153 | struct inode *inode = d_inode(dentry); |
573ea5fc JK |
154 | |
155 | if (strcmp(name, "") != 0) | |
156 | return -EINVAL; | |
157 | if (!inode_owner_or_capable(inode)) | |
158 | return -EPERM; | |
159 | if (value == NULL) | |
160 | return -EINVAL; | |
161 | ||
162 | F2FS_I(inode)->i_advise |= *(char *)value; | |
30c62fdb | 163 | mark_inode_dirty(inode); |
573ea5fc JK |
164 | return 0; |
165 | } | |
166 | ||
8ae8f162 JK |
167 | #ifdef CONFIG_F2FS_FS_SECURITY |
168 | static int f2fs_initxattrs(struct inode *inode, const struct xattr *xattr_array, | |
169 | void *page) | |
170 | { | |
171 | const struct xattr *xattr; | |
172 | int err = 0; | |
173 | ||
174 | for (xattr = xattr_array; xattr->name != NULL; xattr++) { | |
d631abda | 175 | err = f2fs_setxattr(inode, F2FS_XATTR_INDEX_SECURITY, |
8ae8f162 | 176 | xattr->name, xattr->value, |
c02745ef | 177 | xattr->value_len, (struct page *)page, 0); |
8ae8f162 JK |
178 | if (err < 0) |
179 | break; | |
180 | } | |
181 | return err; | |
182 | } | |
183 | ||
184 | int f2fs_init_security(struct inode *inode, struct inode *dir, | |
185 | const struct qstr *qstr, struct page *ipage) | |
186 | { | |
187 | return security_inode_init_security(inode, dir, qstr, | |
188 | &f2fs_initxattrs, ipage); | |
189 | } | |
190 | #endif | |
191 | ||
af48b85b JK |
192 | const struct xattr_handler f2fs_xattr_user_handler = { |
193 | .prefix = XATTR_USER_PREFIX, | |
194 | .flags = F2FS_XATTR_INDEX_USER, | |
195 | .list = f2fs_xattr_generic_list, | |
196 | .get = f2fs_xattr_generic_get, | |
197 | .set = f2fs_xattr_generic_set, | |
198 | }; | |
199 | ||
200 | const struct xattr_handler f2fs_xattr_trusted_handler = { | |
201 | .prefix = XATTR_TRUSTED_PREFIX, | |
202 | .flags = F2FS_XATTR_INDEX_TRUSTED, | |
203 | .list = f2fs_xattr_generic_list, | |
204 | .get = f2fs_xattr_generic_get, | |
205 | .set = f2fs_xattr_generic_set, | |
206 | }; | |
207 | ||
573ea5fc JK |
208 | const struct xattr_handler f2fs_xattr_advise_handler = { |
209 | .prefix = F2FS_SYSTEM_ADVISE_PREFIX, | |
210 | .flags = F2FS_XATTR_INDEX_ADVISE, | |
211 | .list = f2fs_xattr_advise_list, | |
212 | .get = f2fs_xattr_advise_get, | |
213 | .set = f2fs_xattr_advise_set, | |
214 | }; | |
215 | ||
8ae8f162 JK |
216 | const struct xattr_handler f2fs_xattr_security_handler = { |
217 | .prefix = XATTR_SECURITY_PREFIX, | |
218 | .flags = F2FS_XATTR_INDEX_SECURITY, | |
219 | .list = f2fs_xattr_generic_list, | |
220 | .get = f2fs_xattr_generic_get, | |
221 | .set = f2fs_xattr_generic_set, | |
222 | }; | |
223 | ||
af48b85b JK |
224 | static const struct xattr_handler *f2fs_xattr_handler_map[] = { |
225 | [F2FS_XATTR_INDEX_USER] = &f2fs_xattr_user_handler, | |
226 | #ifdef CONFIG_F2FS_FS_POSIX_ACL | |
a6dda0e6 CH |
227 | [F2FS_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler, |
228 | [F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler, | |
af48b85b JK |
229 | #endif |
230 | [F2FS_XATTR_INDEX_TRUSTED] = &f2fs_xattr_trusted_handler, | |
8ae8f162 JK |
231 | #ifdef CONFIG_F2FS_FS_SECURITY |
232 | [F2FS_XATTR_INDEX_SECURITY] = &f2fs_xattr_security_handler, | |
233 | #endif | |
af48b85b JK |
234 | [F2FS_XATTR_INDEX_ADVISE] = &f2fs_xattr_advise_handler, |
235 | }; | |
236 | ||
237 | const struct xattr_handler *f2fs_xattr_handlers[] = { | |
238 | &f2fs_xattr_user_handler, | |
239 | #ifdef CONFIG_F2FS_FS_POSIX_ACL | |
a6dda0e6 CH |
240 | &posix_acl_access_xattr_handler, |
241 | &posix_acl_default_xattr_handler, | |
af48b85b JK |
242 | #endif |
243 | &f2fs_xattr_trusted_handler, | |
8ae8f162 JK |
244 | #ifdef CONFIG_F2FS_FS_SECURITY |
245 | &f2fs_xattr_security_handler, | |
246 | #endif | |
af48b85b JK |
247 | &f2fs_xattr_advise_handler, |
248 | NULL, | |
249 | }; | |
250 | ||
e1123268 | 251 | static inline const struct xattr_handler *f2fs_xattr_handler(int index) |
af48b85b JK |
252 | { |
253 | const struct xattr_handler *handler = NULL; | |
254 | ||
e1123268 JK |
255 | if (index > 0 && index < ARRAY_SIZE(f2fs_xattr_handler_map)) |
256 | handler = f2fs_xattr_handler_map[index]; | |
af48b85b JK |
257 | return handler; |
258 | } | |
259 | ||
e1123268 JK |
260 | static struct f2fs_xattr_entry *__find_xattr(void *base_addr, int index, |
261 | size_t len, const char *name) | |
dd9cfe23 JK |
262 | { |
263 | struct f2fs_xattr_entry *entry; | |
264 | ||
265 | list_for_each_xattr(entry, base_addr) { | |
e1123268 | 266 | if (entry->e_name_index != index) |
dd9cfe23 | 267 | continue; |
e1123268 | 268 | if (entry->e_name_len != len) |
dd9cfe23 | 269 | continue; |
e1123268 | 270 | if (!memcmp(entry->e_name, name, len)) |
dd9cfe23 JK |
271 | break; |
272 | } | |
273 | return entry; | |
274 | } | |
275 | ||
65985d93 JK |
276 | static void *read_all_xattrs(struct inode *inode, struct page *ipage) |
277 | { | |
4081363f | 278 | struct f2fs_sb_info *sbi = F2FS_I_SB(inode); |
65985d93 JK |
279 | struct f2fs_xattr_header *header; |
280 | size_t size = PAGE_SIZE, inline_size = 0; | |
281 | void *txattr_addr; | |
282 | ||
283 | inline_size = inline_xattr_size(inode); | |
284 | ||
808a1d74 | 285 | txattr_addr = kzalloc(inline_size + size, GFP_F2FS_ZERO); |
65985d93 JK |
286 | if (!txattr_addr) |
287 | return NULL; | |
288 | ||
289 | /* read from inline xattr */ | |
290 | if (inline_size) { | |
291 | struct page *page = NULL; | |
292 | void *inline_addr; | |
293 | ||
294 | if (ipage) { | |
295 | inline_addr = inline_xattr_addr(ipage); | |
296 | } else { | |
297 | page = get_node_page(sbi, inode->i_ino); | |
298 | if (IS_ERR(page)) | |
299 | goto fail; | |
300 | inline_addr = inline_xattr_addr(page); | |
301 | } | |
302 | memcpy(txattr_addr, inline_addr, inline_size); | |
303 | f2fs_put_page(page, 1); | |
304 | } | |
305 | ||
306 | /* read from xattr node block */ | |
307 | if (F2FS_I(inode)->i_xattr_nid) { | |
308 | struct page *xpage; | |
309 | void *xattr_addr; | |
310 | ||
311 | /* The inode already has an extended attribute block. */ | |
312 | xpage = get_node_page(sbi, F2FS_I(inode)->i_xattr_nid); | |
313 | if (IS_ERR(xpage)) | |
314 | goto fail; | |
315 | ||
316 | xattr_addr = page_address(xpage); | |
317 | memcpy(txattr_addr + inline_size, xattr_addr, PAGE_SIZE); | |
318 | f2fs_put_page(xpage, 1); | |
319 | } | |
320 | ||
321 | header = XATTR_HDR(txattr_addr); | |
322 | ||
323 | /* never been allocated xattrs */ | |
324 | if (le32_to_cpu(header->h_magic) != F2FS_XATTR_MAGIC) { | |
325 | header->h_magic = cpu_to_le32(F2FS_XATTR_MAGIC); | |
326 | header->h_refcount = cpu_to_le32(1); | |
327 | } | |
328 | return txattr_addr; | |
329 | fail: | |
330 | kzfree(txattr_addr); | |
331 | return NULL; | |
332 | } | |
333 | ||
334 | static inline int write_all_xattrs(struct inode *inode, __u32 hsize, | |
335 | void *txattr_addr, struct page *ipage) | |
336 | { | |
4081363f | 337 | struct f2fs_sb_info *sbi = F2FS_I_SB(inode); |
65985d93 JK |
338 | size_t inline_size = 0; |
339 | void *xattr_addr; | |
340 | struct page *xpage; | |
341 | nid_t new_nid = 0; | |
342 | int err; | |
343 | ||
344 | inline_size = inline_xattr_size(inode); | |
345 | ||
346 | if (hsize > inline_size && !F2FS_I(inode)->i_xattr_nid) | |
347 | if (!alloc_nid(sbi, &new_nid)) | |
348 | return -ENOSPC; | |
349 | ||
350 | /* write to inline xattr */ | |
351 | if (inline_size) { | |
352 | struct page *page = NULL; | |
353 | void *inline_addr; | |
354 | ||
355 | if (ipage) { | |
356 | inline_addr = inline_xattr_addr(ipage); | |
54b591df | 357 | f2fs_wait_on_page_writeback(ipage, NODE); |
65985d93 JK |
358 | } else { |
359 | page = get_node_page(sbi, inode->i_ino); | |
360 | if (IS_ERR(page)) { | |
361 | alloc_nid_failed(sbi, new_nid); | |
362 | return PTR_ERR(page); | |
363 | } | |
364 | inline_addr = inline_xattr_addr(page); | |
54b591df | 365 | f2fs_wait_on_page_writeback(page, NODE); |
65985d93 JK |
366 | } |
367 | memcpy(inline_addr, txattr_addr, inline_size); | |
368 | f2fs_put_page(page, 1); | |
369 | ||
370 | /* no need to use xattr node block */ | |
371 | if (hsize <= inline_size) { | |
372 | err = truncate_xattr_node(inode, ipage); | |
373 | alloc_nid_failed(sbi, new_nid); | |
374 | return err; | |
375 | } | |
376 | } | |
377 | ||
378 | /* write to xattr node block */ | |
379 | if (F2FS_I(inode)->i_xattr_nid) { | |
380 | xpage = get_node_page(sbi, F2FS_I(inode)->i_xattr_nid); | |
381 | if (IS_ERR(xpage)) { | |
382 | alloc_nid_failed(sbi, new_nid); | |
383 | return PTR_ERR(xpage); | |
384 | } | |
9850cf4a | 385 | f2fs_bug_on(sbi, new_nid); |
54b591df | 386 | f2fs_wait_on_page_writeback(xpage, NODE); |
65985d93 JK |
387 | } else { |
388 | struct dnode_of_data dn; | |
389 | set_new_dnode(&dn, inode, NULL, NULL, new_nid); | |
390 | xpage = new_node_page(&dn, XATTR_NODE_OFFSET, ipage); | |
391 | if (IS_ERR(xpage)) { | |
392 | alloc_nid_failed(sbi, new_nid); | |
393 | return PTR_ERR(xpage); | |
394 | } | |
395 | alloc_nid_done(sbi, new_nid); | |
396 | } | |
397 | ||
398 | xattr_addr = page_address(xpage); | |
399 | memcpy(xattr_addr, txattr_addr + inline_size, PAGE_SIZE - | |
400 | sizeof(struct node_footer)); | |
401 | set_page_dirty(xpage); | |
402 | f2fs_put_page(xpage, 1); | |
403 | ||
404 | /* need to checkpoint during fsync */ | |
405 | F2FS_I(inode)->xattr_ver = cur_cp_version(F2FS_CKPT(sbi)); | |
406 | return 0; | |
407 | } | |
408 | ||
e1123268 | 409 | int f2fs_getxattr(struct inode *inode, int index, const char *name, |
bce8d112 | 410 | void *buffer, size_t buffer_size, struct page *ipage) |
af48b85b | 411 | { |
af48b85b | 412 | struct f2fs_xattr_entry *entry; |
65985d93 | 413 | void *base_addr; |
dd9cfe23 | 414 | int error = 0; |
e1123268 | 415 | size_t size, len; |
af48b85b JK |
416 | |
417 | if (name == NULL) | |
418 | return -EINVAL; | |
e1123268 JK |
419 | |
420 | len = strlen(name); | |
421 | if (len > F2FS_NAME_LEN) | |
6e452d69 | 422 | return -ERANGE; |
af48b85b | 423 | |
bce8d112 | 424 | base_addr = read_all_xattrs(inode, ipage); |
65985d93 JK |
425 | if (!base_addr) |
426 | return -ENOMEM; | |
af48b85b | 427 | |
e1123268 | 428 | entry = __find_xattr(base_addr, index, len, name); |
dd9cfe23 | 429 | if (IS_XATTR_LAST_ENTRY(entry)) { |
af48b85b JK |
430 | error = -ENODATA; |
431 | goto cleanup; | |
432 | } | |
433 | ||
e1123268 | 434 | size = le16_to_cpu(entry->e_value_size); |
af48b85b | 435 | |
e1123268 | 436 | if (buffer && size > buffer_size) { |
af48b85b JK |
437 | error = -ERANGE; |
438 | goto cleanup; | |
439 | } | |
440 | ||
441 | if (buffer) { | |
442 | char *pval = entry->e_name + entry->e_name_len; | |
e1123268 | 443 | memcpy(buffer, pval, size); |
af48b85b | 444 | } |
e1123268 | 445 | error = size; |
af48b85b JK |
446 | |
447 | cleanup: | |
65985d93 | 448 | kzfree(base_addr); |
af48b85b JK |
449 | return error; |
450 | } | |
451 | ||
452 | ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) | |
453 | { | |
2b0143b5 | 454 | struct inode *inode = d_inode(dentry); |
af48b85b | 455 | struct f2fs_xattr_entry *entry; |
af48b85b JK |
456 | void *base_addr; |
457 | int error = 0; | |
458 | size_t rest = buffer_size; | |
459 | ||
65985d93 JK |
460 | base_addr = read_all_xattrs(inode, NULL); |
461 | if (!base_addr) | |
462 | return -ENOMEM; | |
af48b85b JK |
463 | |
464 | list_for_each_xattr(entry, base_addr) { | |
465 | const struct xattr_handler *handler = | |
466 | f2fs_xattr_handler(entry->e_name_index); | |
467 | size_t size; | |
468 | ||
469 | if (!handler) | |
470 | continue; | |
471 | ||
d9a82a04 AG |
472 | size = handler->list(handler, dentry, buffer, rest, |
473 | entry->e_name, entry->e_name_len); | |
af48b85b JK |
474 | if (buffer && size > rest) { |
475 | error = -ERANGE; | |
476 | goto cleanup; | |
477 | } | |
478 | ||
479 | if (buffer) | |
480 | buffer += size; | |
481 | rest -= size; | |
482 | } | |
483 | error = buffer_size - rest; | |
484 | cleanup: | |
65985d93 | 485 | kzfree(base_addr); |
af48b85b JK |
486 | return error; |
487 | } | |
488 | ||
e1123268 JK |
489 | static int __f2fs_setxattr(struct inode *inode, int index, |
490 | const char *name, const void *value, size_t size, | |
c02745ef | 491 | struct page *ipage, int flags) |
af48b85b | 492 | { |
af48b85b | 493 | struct f2fs_inode_info *fi = F2FS_I(inode); |
af48b85b | 494 | struct f2fs_xattr_entry *here, *last; |
af48b85b | 495 | void *base_addr; |
65985d93 | 496 | int found, newsize; |
e1123268 | 497 | size_t len; |
65985d93 JK |
498 | __u32 new_hsize; |
499 | int error = -ENOMEM; | |
af48b85b JK |
500 | |
501 | if (name == NULL) | |
502 | return -EINVAL; | |
af48b85b JK |
503 | |
504 | if (value == NULL) | |
e1123268 | 505 | size = 0; |
af48b85b | 506 | |
e1123268 | 507 | len = strlen(name); |
7c909772 | 508 | |
037fe70c | 509 | if (len > F2FS_NAME_LEN) |
af48b85b JK |
510 | return -ERANGE; |
511 | ||
037fe70c CY |
512 | if (size > MAX_VALUE_LEN(inode)) |
513 | return -E2BIG; | |
514 | ||
65985d93 JK |
515 | base_addr = read_all_xattrs(inode, ipage); |
516 | if (!base_addr) | |
517 | goto exit; | |
af48b85b JK |
518 | |
519 | /* find entry with wanted name. */ | |
e1123268 | 520 | here = __find_xattr(base_addr, index, len, name); |
af48b85b | 521 | |
dd9cfe23 | 522 | found = IS_XATTR_LAST_ENTRY(here) ? 0 : 1; |
af48b85b | 523 | |
916decbf JK |
524 | if ((flags & XATTR_REPLACE) && !found) { |
525 | error = -ENODATA; | |
526 | goto exit; | |
527 | } else if ((flags & XATTR_CREATE) && found) { | |
528 | error = -EEXIST; | |
529 | goto exit; | |
530 | } | |
531 | ||
532 | last = here; | |
af48b85b JK |
533 | while (!IS_XATTR_LAST_ENTRY(last)) |
534 | last = XATTR_NEXT_ENTRY(last); | |
535 | ||
e1123268 | 536 | newsize = XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) + len + size); |
af48b85b JK |
537 | |
538 | /* 1. Check space */ | |
539 | if (value) { | |
65985d93 JK |
540 | int free; |
541 | /* | |
542 | * If value is NULL, it is remove operation. | |
e1c42045 | 543 | * In case of update operation, we calculate free. |
af48b85b | 544 | */ |
65985d93 | 545 | free = MIN_OFFSET(inode) - ((char *)last - (char *)base_addr); |
af48b85b | 546 | if (found) |
cc3de6a3 | 547 | free = free + ENTRY_SIZE(here); |
af48b85b | 548 | |
6bacf52f | 549 | if (unlikely(free < newsize)) { |
af48b85b | 550 | error = -ENOSPC; |
65985d93 | 551 | goto exit; |
af48b85b JK |
552 | } |
553 | } | |
554 | ||
555 | /* 2. Remove old entry */ | |
556 | if (found) { | |
65985d93 JK |
557 | /* |
558 | * If entry is found, remove old entry. | |
af48b85b JK |
559 | * If not found, remove operation is not needed. |
560 | */ | |
561 | struct f2fs_xattr_entry *next = XATTR_NEXT_ENTRY(here); | |
562 | int oldsize = ENTRY_SIZE(here); | |
563 | ||
564 | memmove(here, next, (char *)last - (char *)next); | |
565 | last = (struct f2fs_xattr_entry *)((char *)last - oldsize); | |
566 | memset(last, 0, oldsize); | |
567 | } | |
568 | ||
65985d93 JK |
569 | new_hsize = (char *)last - (char *)base_addr; |
570 | ||
af48b85b JK |
571 | /* 3. Write new entry */ |
572 | if (value) { | |
65985d93 JK |
573 | char *pval; |
574 | /* | |
575 | * Before we come here, old entry is removed. | |
576 | * We just write new entry. | |
577 | */ | |
af48b85b | 578 | memset(last, 0, newsize); |
e1123268 JK |
579 | last->e_name_index = index; |
580 | last->e_name_len = len; | |
581 | memcpy(last->e_name, name, len); | |
582 | pval = last->e_name + len; | |
583 | memcpy(pval, value, size); | |
584 | last->e_value_size = cpu_to_le16(size); | |
65985d93 | 585 | new_hsize += newsize; |
af48b85b JK |
586 | } |
587 | ||
65985d93 JK |
588 | error = write_all_xattrs(inode, new_hsize, base_addr, ipage); |
589 | if (error) | |
590 | goto exit; | |
af48b85b JK |
591 | |
592 | if (is_inode_flag_set(fi, FI_ACL_MODE)) { | |
593 | inode->i_mode = fi->i_acl_mode; | |
594 | inode->i_ctime = CURRENT_TIME; | |
595 | clear_inode_flag(fi, FI_ACL_MODE); | |
596 | } | |
f424f664 JK |
597 | if (index == F2FS_XATTR_INDEX_ENCRYPTION && |
598 | !strcmp(name, F2FS_XATTR_NAME_ENCRYPTION_CONTEXT)) | |
599 | f2fs_set_encrypted_inode(inode); | |
e518ff81 | 600 | |
8ae8f162 JK |
601 | if (ipage) |
602 | update_inode(inode, ipage); | |
603 | else | |
604 | update_inode_page(inode); | |
7c909772 | 605 | exit: |
65985d93 | 606 | kzfree(base_addr); |
af48b85b JK |
607 | return error; |
608 | } | |
52ab9560 | 609 | |
e1123268 JK |
610 | int f2fs_setxattr(struct inode *inode, int index, const char *name, |
611 | const void *value, size_t size, | |
c02745ef | 612 | struct page *ipage, int flags) |
52ab9560 | 613 | { |
4081363f | 614 | struct f2fs_sb_info *sbi = F2FS_I_SB(inode); |
52ab9560 RK |
615 | int err; |
616 | ||
d631abda JK |
617 | /* this case is only from init_inode_metadata */ |
618 | if (ipage) | |
619 | return __f2fs_setxattr(inode, index, name, value, | |
620 | size, ipage, flags); | |
52ab9560 RK |
621 | f2fs_balance_fs(sbi); |
622 | ||
e479556b | 623 | f2fs_lock_op(sbi); |
d928bfbf JK |
624 | /* protect xattr_ver */ |
625 | down_write(&F2FS_I(inode)->i_sem); | |
c02745ef | 626 | err = __f2fs_setxattr(inode, index, name, value, size, ipage, flags); |
d928bfbf | 627 | up_write(&F2FS_I(inode)->i_sem); |
e479556b | 628 | f2fs_unlock_op(sbi); |
52ab9560 RK |
629 | |
630 | return err; | |
631 | } |