1 // SPDX-License-Identifier: GPL-2.0
5 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
6 * http://www.samsung.com/
8 * Portions of this code from linux/fs/ext2/xattr.c
13 * Extended attributes for symlinks and special files added per
18 #include <linux/rwsem.h>
19 #include <linux/f2fs_fs.h>
20 #include <linux/security.h>
21 #include <linux/posix_acl_xattr.h>
26 static void *xattr_alloc(struct f2fs_sb_info *sbi, int size, bool *is_inline)
28 if (likely(size == sbi->inline_xattr_slab_size)) {
30 return f2fs_kmem_cache_alloc(sbi->inline_xattr_slab,
31 GFP_F2FS_ZERO, false, sbi);
34 return f2fs_kzalloc(sbi, size, GFP_NOFS);
37 static void xattr_free(struct f2fs_sb_info *sbi, void *xattr_addr,
41 kmem_cache_free(sbi->inline_xattr_slab, xattr_addr);
46 static int f2fs_xattr_generic_get(const struct xattr_handler *handler,
47 struct dentry *unused, struct inode *inode,
48 const char *name, void *buffer, size_t size)
50 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
52 switch (handler->flags) {
53 case F2FS_XATTR_INDEX_USER:
54 if (!test_opt(sbi, XATTR_USER))
57 case F2FS_XATTR_INDEX_TRUSTED:
58 case F2FS_XATTR_INDEX_SECURITY:
63 return f2fs_getxattr(inode, handler->flags, name,
67 static int f2fs_xattr_generic_set(const struct xattr_handler *handler,
68 struct user_namespace *mnt_userns,
69 struct dentry *unused, struct inode *inode,
70 const char *name, const void *value,
71 size_t size, int flags)
73 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
75 switch (handler->flags) {
76 case F2FS_XATTR_INDEX_USER:
77 if (!test_opt(sbi, XATTR_USER))
80 case F2FS_XATTR_INDEX_TRUSTED:
81 case F2FS_XATTR_INDEX_SECURITY:
86 return f2fs_setxattr(inode, handler->flags, name,
87 value, size, NULL, flags);
90 static bool f2fs_xattr_user_list(struct dentry *dentry)
92 struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
94 return test_opt(sbi, XATTR_USER);
97 static bool f2fs_xattr_trusted_list(struct dentry *dentry)
99 return capable(CAP_SYS_ADMIN);
102 static int f2fs_xattr_advise_get(const struct xattr_handler *handler,
103 struct dentry *unused, struct inode *inode,
104 const char *name, void *buffer, size_t size)
107 *((char *)buffer) = F2FS_I(inode)->i_advise;
111 static int f2fs_xattr_advise_set(const struct xattr_handler *handler,
112 struct user_namespace *mnt_userns,
113 struct dentry *unused, struct inode *inode,
114 const char *name, const void *value,
115 size_t size, int flags)
117 unsigned char old_advise = F2FS_I(inode)->i_advise;
118 unsigned char new_advise;
120 if (!inode_owner_or_capable(&init_user_ns, inode))
125 new_advise = *(char *)value;
126 if (new_advise & ~FADVISE_MODIFIABLE_BITS)
129 new_advise = new_advise & FADVISE_MODIFIABLE_BITS;
130 new_advise |= old_advise & ~FADVISE_MODIFIABLE_BITS;
132 F2FS_I(inode)->i_advise = new_advise;
133 f2fs_mark_inode_dirty_sync(inode, true);
137 #ifdef CONFIG_F2FS_FS_SECURITY
138 static int f2fs_initxattrs(struct inode *inode, const struct xattr *xattr_array,
141 const struct xattr *xattr;
144 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
145 err = f2fs_setxattr(inode, F2FS_XATTR_INDEX_SECURITY,
146 xattr->name, xattr->value,
147 xattr->value_len, (struct page *)page, 0);
154 int f2fs_init_security(struct inode *inode, struct inode *dir,
155 const struct qstr *qstr, struct page *ipage)
157 return security_inode_init_security(inode, dir, qstr,
158 &f2fs_initxattrs, ipage);
162 const struct xattr_handler f2fs_xattr_user_handler = {
163 .prefix = XATTR_USER_PREFIX,
164 .flags = F2FS_XATTR_INDEX_USER,
165 .list = f2fs_xattr_user_list,
166 .get = f2fs_xattr_generic_get,
167 .set = f2fs_xattr_generic_set,
170 const struct xattr_handler f2fs_xattr_trusted_handler = {
171 .prefix = XATTR_TRUSTED_PREFIX,
172 .flags = F2FS_XATTR_INDEX_TRUSTED,
173 .list = f2fs_xattr_trusted_list,
174 .get = f2fs_xattr_generic_get,
175 .set = f2fs_xattr_generic_set,
178 const struct xattr_handler f2fs_xattr_advise_handler = {
179 .name = F2FS_SYSTEM_ADVISE_NAME,
180 .flags = F2FS_XATTR_INDEX_ADVISE,
181 .get = f2fs_xattr_advise_get,
182 .set = f2fs_xattr_advise_set,
185 const struct xattr_handler f2fs_xattr_security_handler = {
186 .prefix = XATTR_SECURITY_PREFIX,
187 .flags = F2FS_XATTR_INDEX_SECURITY,
188 .get = f2fs_xattr_generic_get,
189 .set = f2fs_xattr_generic_set,
192 static const struct xattr_handler *f2fs_xattr_handler_map[] = {
193 [F2FS_XATTR_INDEX_USER] = &f2fs_xattr_user_handler,
194 #ifdef CONFIG_F2FS_FS_POSIX_ACL
195 [F2FS_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler,
196 [F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler,
198 [F2FS_XATTR_INDEX_TRUSTED] = &f2fs_xattr_trusted_handler,
199 #ifdef CONFIG_F2FS_FS_SECURITY
200 [F2FS_XATTR_INDEX_SECURITY] = &f2fs_xattr_security_handler,
202 [F2FS_XATTR_INDEX_ADVISE] = &f2fs_xattr_advise_handler,
205 const struct xattr_handler *f2fs_xattr_handlers[] = {
206 &f2fs_xattr_user_handler,
207 #ifdef CONFIG_F2FS_FS_POSIX_ACL
208 &posix_acl_access_xattr_handler,
209 &posix_acl_default_xattr_handler,
211 &f2fs_xattr_trusted_handler,
212 #ifdef CONFIG_F2FS_FS_SECURITY
213 &f2fs_xattr_security_handler,
215 &f2fs_xattr_advise_handler,
219 static inline const struct xattr_handler *f2fs_xattr_handler(int index)
221 const struct xattr_handler *handler = NULL;
223 if (index > 0 && index < ARRAY_SIZE(f2fs_xattr_handler_map))
224 handler = f2fs_xattr_handler_map[index];
228 static struct f2fs_xattr_entry *__find_xattr(void *base_addr,
229 void *last_base_addr, int index,
230 size_t len, const char *name)
232 struct f2fs_xattr_entry *entry;
234 list_for_each_xattr(entry, base_addr) {
235 if ((void *)(entry) + sizeof(__u32) > last_base_addr ||
236 (void *)XATTR_NEXT_ENTRY(entry) > last_base_addr)
239 if (entry->e_name_index != index)
241 if (entry->e_name_len != len)
243 if (!memcmp(entry->e_name, name, len))
249 static struct f2fs_xattr_entry *__find_inline_xattr(struct inode *inode,
250 void *base_addr, void **last_addr, int index,
251 size_t len, const char *name)
253 struct f2fs_xattr_entry *entry;
254 unsigned int inline_size = inline_xattr_size(inode);
255 void *max_addr = base_addr + inline_size;
257 list_for_each_xattr(entry, base_addr) {
258 if ((void *)entry + sizeof(__u32) > max_addr ||
259 (void *)XATTR_NEXT_ENTRY(entry) > max_addr) {
263 if (entry->e_name_index != index)
265 if (entry->e_name_len != len)
267 if (!memcmp(entry->e_name, name, len))
271 /* inline xattr header or entry across max inline xattr size */
272 if (IS_XATTR_LAST_ENTRY(entry) &&
273 (void *)entry + sizeof(__u32) > max_addr) {
280 static int read_inline_xattr(struct inode *inode, struct page *ipage,
283 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
284 unsigned int inline_size = inline_xattr_size(inode);
285 struct page *page = NULL;
289 inline_addr = inline_xattr_addr(inode, ipage);
291 page = f2fs_get_node_page(sbi, inode->i_ino);
293 return PTR_ERR(page);
295 inline_addr = inline_xattr_addr(inode, page);
297 memcpy(txattr_addr, inline_addr, inline_size);
298 f2fs_put_page(page, 1);
303 static int read_xattr_block(struct inode *inode, void *txattr_addr)
305 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
306 nid_t xnid = F2FS_I(inode)->i_xattr_nid;
307 unsigned int inline_size = inline_xattr_size(inode);
311 /* The inode already has an extended attribute block. */
312 xpage = f2fs_get_node_page(sbi, xnid);
314 return PTR_ERR(xpage);
316 xattr_addr = page_address(xpage);
317 memcpy(txattr_addr + inline_size, xattr_addr, VALID_XATTR_BLOCK_SIZE);
318 f2fs_put_page(xpage, 1);
323 static int lookup_all_xattrs(struct inode *inode, struct page *ipage,
324 unsigned int index, unsigned int len,
325 const char *name, struct f2fs_xattr_entry **xe,
326 void **base_addr, int *base_size,
329 void *cur_addr, *txattr_addr, *last_txattr_addr;
330 void *last_addr = NULL;
331 nid_t xnid = F2FS_I(inode)->i_xattr_nid;
332 unsigned int inline_size = inline_xattr_size(inode);
335 if (!xnid && !inline_size)
338 *base_size = XATTR_SIZE(inode) + XATTR_PADDING_SIZE;
339 txattr_addr = xattr_alloc(F2FS_I_SB(inode), *base_size, is_inline);
343 last_txattr_addr = (void *)txattr_addr + XATTR_SIZE(inode);
345 /* read from inline xattr */
347 err = read_inline_xattr(inode, ipage, txattr_addr);
351 *xe = __find_inline_xattr(inode, txattr_addr, &last_addr,
354 *base_size = inline_size;
359 /* read from xattr node block */
361 err = read_xattr_block(inode, txattr_addr);
367 cur_addr = XATTR_HDR(last_addr) - 1;
369 cur_addr = txattr_addr;
371 *xe = __find_xattr(cur_addr, last_txattr_addr, index, len, name);
373 f2fs_err(F2FS_I_SB(inode), "inode (%lu) has corrupted xattr",
375 set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK);
380 if (IS_XATTR_LAST_ENTRY(*xe)) {
385 *base_addr = txattr_addr;
388 xattr_free(F2FS_I_SB(inode), txattr_addr, *is_inline);
392 static int read_all_xattrs(struct inode *inode, struct page *ipage,
395 struct f2fs_xattr_header *header;
396 nid_t xnid = F2FS_I(inode)->i_xattr_nid;
397 unsigned int size = VALID_XATTR_BLOCK_SIZE;
398 unsigned int inline_size = inline_xattr_size(inode);
402 txattr_addr = f2fs_kzalloc(F2FS_I_SB(inode),
403 inline_size + size + XATTR_PADDING_SIZE, GFP_NOFS);
407 /* read from inline xattr */
409 err = read_inline_xattr(inode, ipage, txattr_addr);
414 /* read from xattr node block */
416 err = read_xattr_block(inode, txattr_addr);
421 header = XATTR_HDR(txattr_addr);
423 /* never been allocated xattrs */
424 if (le32_to_cpu(header->h_magic) != F2FS_XATTR_MAGIC) {
425 header->h_magic = cpu_to_le32(F2FS_XATTR_MAGIC);
426 header->h_refcount = cpu_to_le32(1);
428 *base_addr = txattr_addr;
435 static inline int write_all_xattrs(struct inode *inode, __u32 hsize,
436 void *txattr_addr, struct page *ipage)
438 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
439 size_t inline_size = inline_xattr_size(inode);
440 struct page *in_page = NULL;
442 void *inline_addr = NULL;
447 if (hsize > inline_size && !F2FS_I(inode)->i_xattr_nid)
448 if (!f2fs_alloc_nid(sbi, &new_nid))
451 /* write to inline xattr */
454 inline_addr = inline_xattr_addr(inode, ipage);
456 in_page = f2fs_get_node_page(sbi, inode->i_ino);
457 if (IS_ERR(in_page)) {
458 f2fs_alloc_nid_failed(sbi, new_nid);
459 return PTR_ERR(in_page);
461 inline_addr = inline_xattr_addr(inode, in_page);
464 f2fs_wait_on_page_writeback(ipage ? ipage : in_page,
466 /* no need to use xattr node block */
467 if (hsize <= inline_size) {
468 err = f2fs_truncate_xattr_node(inode);
469 f2fs_alloc_nid_failed(sbi, new_nid);
471 f2fs_put_page(in_page, 1);
474 memcpy(inline_addr, txattr_addr, inline_size);
475 set_page_dirty(ipage ? ipage : in_page);
480 /* write to xattr node block */
481 if (F2FS_I(inode)->i_xattr_nid) {
482 xpage = f2fs_get_node_page(sbi, F2FS_I(inode)->i_xattr_nid);
484 err = PTR_ERR(xpage);
485 f2fs_alloc_nid_failed(sbi, new_nid);
488 f2fs_bug_on(sbi, new_nid);
489 f2fs_wait_on_page_writeback(xpage, NODE, true, true);
491 struct dnode_of_data dn;
493 set_new_dnode(&dn, inode, NULL, NULL, new_nid);
494 xpage = f2fs_new_node_page(&dn, XATTR_NODE_OFFSET);
496 err = PTR_ERR(xpage);
497 f2fs_alloc_nid_failed(sbi, new_nid);
500 f2fs_alloc_nid_done(sbi, new_nid);
502 xattr_addr = page_address(xpage);
505 memcpy(inline_addr, txattr_addr, inline_size);
506 memcpy(xattr_addr, txattr_addr + inline_size, VALID_XATTR_BLOCK_SIZE);
509 set_page_dirty(ipage ? ipage : in_page);
510 set_page_dirty(xpage);
512 f2fs_put_page(xpage, 1);
514 f2fs_put_page(in_page, 1);
518 int f2fs_getxattr(struct inode *inode, int index, const char *name,
519 void *buffer, size_t buffer_size, struct page *ipage)
521 struct f2fs_xattr_entry *entry = NULL;
523 unsigned int size, len;
524 void *base_addr = NULL;
532 if (len > F2FS_NAME_LEN)
535 down_read(&F2FS_I(inode)->i_xattr_sem);
536 error = lookup_all_xattrs(inode, ipage, index, len, name,
537 &entry, &base_addr, &base_size, &is_inline);
538 up_read(&F2FS_I(inode)->i_xattr_sem);
542 size = le16_to_cpu(entry->e_value_size);
544 if (buffer && size > buffer_size) {
550 char *pval = entry->e_name + entry->e_name_len;
552 if (base_size - (pval - (char *)base_addr) < size) {
556 memcpy(buffer, pval, size);
560 xattr_free(F2FS_I_SB(inode), base_addr, is_inline);
564 ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
566 struct inode *inode = d_inode(dentry);
567 struct f2fs_xattr_entry *entry;
568 void *base_addr, *last_base_addr;
570 size_t rest = buffer_size;
572 down_read(&F2FS_I(inode)->i_xattr_sem);
573 error = read_all_xattrs(inode, NULL, &base_addr);
574 up_read(&F2FS_I(inode)->i_xattr_sem);
578 last_base_addr = (void *)base_addr + XATTR_SIZE(inode);
580 list_for_each_xattr(entry, base_addr) {
581 const struct xattr_handler *handler =
582 f2fs_xattr_handler(entry->e_name_index);
587 if ((void *)(entry) + sizeof(__u32) > last_base_addr ||
588 (void *)XATTR_NEXT_ENTRY(entry) > last_base_addr) {
589 f2fs_err(F2FS_I_SB(inode), "inode (%lu) has corrupted xattr",
591 set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK);
592 error = -EFSCORRUPTED;
596 if (!handler || (handler->list && !handler->list(dentry)))
599 prefix = xattr_prefix(handler);
600 prefix_len = strlen(prefix);
601 size = prefix_len + entry->e_name_len + 1;
607 memcpy(buffer, prefix, prefix_len);
608 buffer += prefix_len;
609 memcpy(buffer, entry->e_name, entry->e_name_len);
610 buffer += entry->e_name_len;
615 error = buffer_size - rest;
621 static bool f2fs_xattr_value_same(struct f2fs_xattr_entry *entry,
622 const void *value, size_t size)
624 void *pval = entry->e_name + entry->e_name_len;
626 return (le16_to_cpu(entry->e_value_size) == size) &&
627 !memcmp(pval, value, size);
630 static int __f2fs_setxattr(struct inode *inode, int index,
631 const char *name, const void *value, size_t size,
632 struct page *ipage, int flags)
634 struct f2fs_xattr_entry *here, *last;
635 void *base_addr, *last_base_addr;
649 if (len > F2FS_NAME_LEN)
652 if (size > MAX_VALUE_LEN(inode))
655 error = read_all_xattrs(inode, ipage, &base_addr);
659 last_base_addr = (void *)base_addr + XATTR_SIZE(inode);
661 /* find entry with wanted name. */
662 here = __find_xattr(base_addr, last_base_addr, index, len, name);
664 f2fs_err(F2FS_I_SB(inode), "inode (%lu) has corrupted xattr",
666 set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK);
667 error = -EFSCORRUPTED;
671 found = IS_XATTR_LAST_ENTRY(here) ? 0 : 1;
674 if ((flags & XATTR_CREATE)) {
679 if (value && f2fs_xattr_value_same(here, value, size))
681 } else if ((flags & XATTR_REPLACE)) {
687 while (!IS_XATTR_LAST_ENTRY(last))
688 last = XATTR_NEXT_ENTRY(last);
690 newsize = XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) + len + size);
696 * If value is NULL, it is remove operation.
697 * In case of update operation, we calculate free.
699 free = MIN_OFFSET(inode) - ((char *)last - (char *)base_addr);
701 free = free + ENTRY_SIZE(here);
703 if (unlikely(free < newsize)) {
709 /* 2. Remove old entry */
712 * If entry is found, remove old entry.
713 * If not found, remove operation is not needed.
715 struct f2fs_xattr_entry *next = XATTR_NEXT_ENTRY(here);
716 int oldsize = ENTRY_SIZE(here);
718 memmove(here, next, (char *)last - (char *)next);
719 last = (struct f2fs_xattr_entry *)((char *)last - oldsize);
720 memset(last, 0, oldsize);
723 new_hsize = (char *)last - (char *)base_addr;
725 /* 3. Write new entry */
729 * Before we come here, old entry is removed.
730 * We just write new entry.
732 last->e_name_index = index;
733 last->e_name_len = len;
734 memcpy(last->e_name, name, len);
735 pval = last->e_name + len;
736 memcpy(pval, value, size);
737 last->e_value_size = cpu_to_le16(size);
738 new_hsize += newsize;
741 error = write_all_xattrs(inode, new_hsize, base_addr, ipage);
745 if (index == F2FS_XATTR_INDEX_ENCRYPTION &&
746 !strcmp(name, F2FS_XATTR_NAME_ENCRYPTION_CONTEXT))
747 f2fs_set_encrypted_inode(inode);
748 f2fs_mark_inode_dirty_sync(inode, true);
749 if (!error && S_ISDIR(inode->i_mode))
750 set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_CP);
753 if (is_inode_flag_set(inode, FI_ACL_MODE)) {
754 inode->i_mode = F2FS_I(inode)->i_acl_mode;
755 inode->i_ctime = current_time(inode);
756 clear_inode_flag(inode, FI_ACL_MODE);
764 int f2fs_setxattr(struct inode *inode, int index, const char *name,
765 const void *value, size_t size,
766 struct page *ipage, int flags)
768 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
771 if (unlikely(f2fs_cp_error(sbi)))
773 if (!f2fs_is_checkpoint_ready(sbi))
776 err = dquot_initialize(inode);
780 /* this case is only from f2fs_init_inode_metadata */
782 return __f2fs_setxattr(inode, index, name, value,
784 f2fs_balance_fs(sbi, true);
787 down_write(&F2FS_I(inode)->i_xattr_sem);
788 err = __f2fs_setxattr(inode, index, name, value, size, ipage, flags);
789 up_write(&F2FS_I(inode)->i_xattr_sem);
792 f2fs_update_time(sbi, REQ_TIME);
796 int f2fs_init_xattr_caches(struct f2fs_sb_info *sbi)
798 dev_t dev = sbi->sb->s_bdev->bd_dev;
801 sprintf(slab_name, "f2fs_xattr_entry-%u:%u", MAJOR(dev), MINOR(dev));
803 sbi->inline_xattr_slab_size = F2FS_OPTION(sbi).inline_xattr_size *
804 sizeof(__le32) + XATTR_PADDING_SIZE;
806 sbi->inline_xattr_slab = f2fs_kmem_cache_create(slab_name,
807 sbi->inline_xattr_slab_size);
808 if (!sbi->inline_xattr_slab)
814 void f2fs_destroy_xattr_caches(struct f2fs_sb_info *sbi)
816 kmem_cache_destroy(sbi->inline_xattr_slab);