1// SPDX-License-Identifier: GPL-2.0
2/*
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.
17 */
18#include <linux/rwsem.h>
19#include <linux/f2fs_fs.h>
20#include <linux/security.h>
21#include <linux/posix_acl_xattr.h>
22#include "f2fs.h"
23#include "xattr.h"
24#include "segment.h"
25
26static void *xattr_alloc(struct f2fs_sb_info *sbi, int size, bool *is_inline)
27{
28	if (likely(size == sbi->inline_xattr_slab_size)) {
29		*is_inline = true;
30		return f2fs_kmem_cache_alloc(sbi->inline_xattr_slab,
31					GFP_F2FS_ZERO, false, sbi);
32	}
33	*is_inline = false;
34	return f2fs_kzalloc(sbi, size, GFP_NOFS);
35}
36
37static void xattr_free(struct f2fs_sb_info *sbi, void *xattr_addr,
38							bool is_inline)
39{
40	if (is_inline)
41		kmem_cache_free(sbi->inline_xattr_slab, xattr_addr);
42	else
43		kfree(xattr_addr);
44}
45
46static 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)
49{
50	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
51
52	switch (handler->flags) {
53	case F2FS_XATTR_INDEX_USER:
54		if (!test_opt(sbi, XATTR_USER))
55			return -EOPNOTSUPP;
56		break;
57	case F2FS_XATTR_INDEX_TRUSTED:
58	case F2FS_XATTR_INDEX_SECURITY:
59		break;
60	default:
61		return -EINVAL;
62	}
63	return f2fs_getxattr(inode, handler->flags, name,
64			     buffer, size, NULL);
65}
66
67static int f2fs_xattr_generic_set(const struct xattr_handler *handler,
68		struct mnt_idmap *idmap,
69		struct dentry *unused, struct inode *inode,
70		const char *name, const void *value,
71		size_t size, int flags)
72{
73	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
74
75	switch (handler->flags) {
76	case F2FS_XATTR_INDEX_USER:
77		if (!test_opt(sbi, XATTR_USER))
78			return -EOPNOTSUPP;
79		break;
80	case F2FS_XATTR_INDEX_TRUSTED:
81	case F2FS_XATTR_INDEX_SECURITY:
82		break;
83	default:
84		return -EINVAL;
85	}
86	return f2fs_setxattr(inode, handler->flags, name,
87					value, size, NULL, flags);
88}
89
90static bool f2fs_xattr_user_list(struct dentry *dentry)
91{
92	struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
93
94	return test_opt(sbi, XATTR_USER);
95}
96
97static bool f2fs_xattr_trusted_list(struct dentry *dentry)
98{
99	return capable(CAP_SYS_ADMIN);
100}
101
102static 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)
105{
106	if (buffer)
107		*((char *)buffer) = F2FS_I(inode)->i_advise;
108	return sizeof(char);
109}
110
111static int f2fs_xattr_advise_set(const struct xattr_handler *handler,
112		struct mnt_idmap *idmap,
113		struct dentry *unused, struct inode *inode,
114		const char *name, const void *value,
115		size_t size, int flags)
116{
117	unsigned char old_advise = F2FS_I(inode)->i_advise;
118	unsigned char new_advise;
119
120	if (!inode_owner_or_capable(&nop_mnt_idmap, inode))
121		return -EPERM;
122	if (value == NULL)
123		return -EINVAL;
124
125	new_advise = *(char *)value;
126	if (new_advise & ~FADVISE_MODIFIABLE_BITS)
127		return -EINVAL;
128
129	new_advise = new_advise & FADVISE_MODIFIABLE_BITS;
130	new_advise |= old_advise & ~FADVISE_MODIFIABLE_BITS;
131
132	F2FS_I(inode)->i_advise = new_advise;
133	f2fs_mark_inode_dirty_sync(inode, true);
134	return 0;
135}
136
137#ifdef CONFIG_F2FS_FS_SECURITY
138static int f2fs_initxattrs(struct inode *inode, const struct xattr *xattr_array,
139		void *page)
140{
141	const struct xattr *xattr;
142	int err = 0;
143
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);
148		if (err < 0)
149			break;
150	}
151	return err;
152}
153
154int f2fs_init_security(struct inode *inode, struct inode *dir,
155				const struct qstr *qstr, struct page *ipage)
156{
157	return security_inode_init_security(inode, dir, qstr,
158				&f2fs_initxattrs, ipage);
159}
160#endif
161
162const 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,
168};
169
170const 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,
176};
177
178const 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,
183};
184
185const 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,
190};
191
192static const struct xattr_handler * const 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] = &nop_posix_acl_access,
196	[F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT] = &nop_posix_acl_default,
197#endif
198	[F2FS_XATTR_INDEX_TRUSTED] = &f2fs_xattr_trusted_handler,
199#ifdef CONFIG_F2FS_FS_SECURITY
200	[F2FS_XATTR_INDEX_SECURITY] = &f2fs_xattr_security_handler,
201#endif
202	[F2FS_XATTR_INDEX_ADVISE] = &f2fs_xattr_advise_handler,
203};
204
205const struct xattr_handler * const f2fs_xattr_handlers[] = {
206	&f2fs_xattr_user_handler,
207	&f2fs_xattr_trusted_handler,
208#ifdef CONFIG_F2FS_FS_SECURITY
209	&f2fs_xattr_security_handler,
210#endif
211	&f2fs_xattr_advise_handler,
212	NULL,
213};
214
215static inline const char *f2fs_xattr_prefix(int index,
216					    struct dentry *dentry)
217{
218	const struct xattr_handler *handler = NULL;
219
220	if (index > 0 && index < ARRAY_SIZE(f2fs_xattr_handler_map))
221		handler = f2fs_xattr_handler_map[index];
222
223	if (!xattr_handler_can_list(handler, dentry))
224		return NULL;
225
226	return xattr_prefix(handler);
227}
228
229static struct f2fs_xattr_entry *__find_xattr(void *base_addr,
230				void *last_base_addr, void **last_addr,
231				int index, size_t len, const char *name)
232{
233	struct f2fs_xattr_entry *entry;
234
235	list_for_each_xattr(entry, base_addr) {
236		if ((void *)(entry) + sizeof(__u32) > last_base_addr ||
237			(void *)XATTR_NEXT_ENTRY(entry) > last_base_addr) {
238			if (last_addr)
239				*last_addr = entry;
240			return NULL;
241		}
242
243		if (entry->e_name_index != index)
244			continue;
245		if (entry->e_name_len != len)
246			continue;
247		if (!memcmp(entry->e_name, name, len))
248			break;
249	}
250	return entry;
251}
252
253static struct f2fs_xattr_entry *__find_inline_xattr(struct inode *inode,
254				void *base_addr, void **last_addr, int index,
255				size_t len, const char *name)
256{
257	struct f2fs_xattr_entry *entry;
258	unsigned int inline_size = inline_xattr_size(inode);
259	void *max_addr = base_addr + inline_size;
260
261	entry = __find_xattr(base_addr, max_addr, last_addr, index, len, name);
262	if (!entry)
263		return NULL;
264
265	/* inline xattr header or entry across max inline xattr size */
266	if (IS_XATTR_LAST_ENTRY(entry) &&
267		(void *)entry + sizeof(__u32) > max_addr) {
268		*last_addr = entry;
269		return NULL;
270	}
271	return entry;
272}
273
274static int read_inline_xattr(struct inode *inode, struct page *ipage,
275							void *txattr_addr)
276{
277	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
278	unsigned int inline_size = inline_xattr_size(inode);
279	struct page *page = NULL;
280	void *inline_addr;
281
282	if (ipage) {
283		inline_addr = inline_xattr_addr(inode, ipage);
284	} else {
285		page = f2fs_get_node_page(sbi, inode->i_ino);
286		if (IS_ERR(page))
287			return PTR_ERR(page);
288
289		inline_addr = inline_xattr_addr(inode, page);
290	}
291	memcpy(txattr_addr, inline_addr, inline_size);
292	f2fs_put_page(page, 1);
293
294	return 0;
295}
296
297static int read_xattr_block(struct inode *inode, void *txattr_addr)
298{
299	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
300	nid_t xnid = F2FS_I(inode)->i_xattr_nid;
301	unsigned int inline_size = inline_xattr_size(inode);
302	struct page *xpage;
303	void *xattr_addr;
304
305	/* The inode already has an extended attribute block. */
306	xpage = f2fs_get_node_page(sbi, xnid);
307	if (IS_ERR(xpage))
308		return PTR_ERR(xpage);
309
310	xattr_addr = page_address(xpage);
311	memcpy(txattr_addr + inline_size, xattr_addr, VALID_XATTR_BLOCK_SIZE);
312	f2fs_put_page(xpage, 1);
313
314	return 0;
315}
316
317static int lookup_all_xattrs(struct inode *inode, struct page *ipage,
318				unsigned int index, unsigned int len,
319				const char *name, struct f2fs_xattr_entry **xe,
320				void **base_addr, int *base_size,
321				bool *is_inline)
322{
323	void *cur_addr, *txattr_addr, *last_txattr_addr;
324	void *last_addr = NULL;
325	nid_t xnid = F2FS_I(inode)->i_xattr_nid;
326	unsigned int inline_size = inline_xattr_size(inode);
327	int err;
328
329	if (!xnid && !inline_size)
330		return -ENODATA;
331
332	*base_size = XATTR_SIZE(inode) + XATTR_PADDING_SIZE;
333	txattr_addr = xattr_alloc(F2FS_I_SB(inode), *base_size, is_inline);
334	if (!txattr_addr)
335		return -ENOMEM;
336
337	last_txattr_addr = (void *)txattr_addr + XATTR_SIZE(inode);
338
339	/* read from inline xattr */
340	if (inline_size) {
341		err = read_inline_xattr(inode, ipage, txattr_addr);
342		if (err)
343			goto out;
344
345		*xe = __find_inline_xattr(inode, txattr_addr, &last_addr,
346						index, len, name);
347		if (*xe) {
348			*base_size = inline_size;
349			goto check;
350		}
351	}
352
353	/* read from xattr node block */
354	if (xnid) {
355		err = read_xattr_block(inode, txattr_addr);
356		if (err)
357			goto out;
358	}
359
360	if (last_addr)
361		cur_addr = XATTR_HDR(last_addr) - 1;
362	else
363		cur_addr = txattr_addr;
364
365	*xe = __find_xattr(cur_addr, last_txattr_addr, NULL, index, len, name);
366	if (!*xe) {
367		f2fs_err(F2FS_I_SB(inode), "lookup inode (%lu) has corrupted xattr",
368								inode->i_ino);
369		set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK);
370		err = -ENODATA;
371		f2fs_handle_error(F2FS_I_SB(inode),
372					ERROR_CORRUPTED_XATTR);
373		goto out;
374	}
375check:
376	if (IS_XATTR_LAST_ENTRY(*xe)) {
377		err = -ENODATA;
378		goto out;
379	}
380
381	*base_addr = txattr_addr;
382	return 0;
383out:
384	xattr_free(F2FS_I_SB(inode), txattr_addr, *is_inline);
385	return err;
386}
387
388static int read_all_xattrs(struct inode *inode, struct page *ipage,
389							void **base_addr)
390{
391	struct f2fs_xattr_header *header;
392	nid_t xnid = F2FS_I(inode)->i_xattr_nid;
393	unsigned int size = VALID_XATTR_BLOCK_SIZE;
394	unsigned int inline_size = inline_xattr_size(inode);
395	void *txattr_addr;
396	int err;
397
398	txattr_addr = f2fs_kzalloc(F2FS_I_SB(inode),
399			inline_size + size + XATTR_PADDING_SIZE, GFP_NOFS);
400	if (!txattr_addr)
401		return -ENOMEM;
402
403	/* read from inline xattr */
404	if (inline_size) {
405		err = read_inline_xattr(inode, ipage, txattr_addr);
406		if (err)
407			goto fail;
408	}
409
410	/* read from xattr node block */
411	if (xnid) {
412		err = read_xattr_block(inode, txattr_addr);
413		if (err)
414			goto fail;
415	}
416
417	header = XATTR_HDR(txattr_addr);
418
419	/* never been allocated xattrs */
420	if (le32_to_cpu(header->h_magic) != F2FS_XATTR_MAGIC) {
421		header->h_magic = cpu_to_le32(F2FS_XATTR_MAGIC);
422		header->h_refcount = cpu_to_le32(1);
423	}
424	*base_addr = txattr_addr;
425	return 0;
426fail:
427	kfree(txattr_addr);
428	return err;
429}
430
431static inline int write_all_xattrs(struct inode *inode, __u32 hsize,
432				void *txattr_addr, struct page *ipage)
433{
434	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
435	size_t inline_size = inline_xattr_size(inode);
436	struct page *in_page = NULL;
437	void *xattr_addr;
438	void *inline_addr = NULL;
439	struct page *xpage;
440	nid_t new_nid = 0;
441	int err = 0;
442
443	if (hsize > inline_size && !F2FS_I(inode)->i_xattr_nid)
444		if (!f2fs_alloc_nid(sbi, &new_nid))
445			return -ENOSPC;
446
447	/* write to inline xattr */
448	if (inline_size) {
449		if (ipage) {
450			inline_addr = inline_xattr_addr(inode, ipage);
451		} else {
452			in_page = f2fs_get_node_page(sbi, inode->i_ino);
453			if (IS_ERR(in_page)) {
454				f2fs_alloc_nid_failed(sbi, new_nid);
455				return PTR_ERR(in_page);
456			}
457			inline_addr = inline_xattr_addr(inode, in_page);
458		}
459
460		f2fs_wait_on_page_writeback(ipage ? ipage : in_page,
461							NODE, true, true);
462		/* no need to use xattr node block */
463		if (hsize <= inline_size) {
464			err = f2fs_truncate_xattr_node(inode);
465			f2fs_alloc_nid_failed(sbi, new_nid);
466			if (err) {
467				f2fs_put_page(in_page, 1);
468				return err;
469			}
470			memcpy(inline_addr, txattr_addr, inline_size);
471			set_page_dirty(ipage ? ipage : in_page);
472			goto in_page_out;
473		}
474	}
475
476	/* write to xattr node block */
477	if (F2FS_I(inode)->i_xattr_nid) {
478		xpage = f2fs_get_node_page(sbi, F2FS_I(inode)->i_xattr_nid);
479		if (IS_ERR(xpage)) {
480			err = PTR_ERR(xpage);
481			f2fs_alloc_nid_failed(sbi, new_nid);
482			goto in_page_out;
483		}
484		f2fs_bug_on(sbi, new_nid);
485		f2fs_wait_on_page_writeback(xpage, NODE, true, true);
486	} else {
487		struct dnode_of_data dn;
488
489		set_new_dnode(&dn, inode, NULL, NULL, new_nid);
490		xpage = f2fs_new_node_page(&dn, XATTR_NODE_OFFSET);
491		if (IS_ERR(xpage)) {
492			err = PTR_ERR(xpage);
493			f2fs_alloc_nid_failed(sbi, new_nid);
494			goto in_page_out;
495		}
496		f2fs_alloc_nid_done(sbi, new_nid);
497	}
498	xattr_addr = page_address(xpage);
499
500	if (inline_size)
501		memcpy(inline_addr, txattr_addr, inline_size);
502	memcpy(xattr_addr, txattr_addr + inline_size, VALID_XATTR_BLOCK_SIZE);
503
504	if (inline_size)
505		set_page_dirty(ipage ? ipage : in_page);
506	set_page_dirty(xpage);
507
508	f2fs_put_page(xpage, 1);
509in_page_out:
510	f2fs_put_page(in_page, 1);
511	return err;
512}
513
514int f2fs_getxattr(struct inode *inode, int index, const char *name,
515		void *buffer, size_t buffer_size, struct page *ipage)
516{
517	struct f2fs_xattr_entry *entry = NULL;
518	int error;
519	unsigned int size, len;
520	void *base_addr = NULL;
521	int base_size;
522	bool is_inline;
523
524	if (name == NULL)
525		return -EINVAL;
526
527	len = strlen(name);
528	if (len > F2FS_NAME_LEN)
529		return -ERANGE;
530
531	if (!ipage)
532		f2fs_down_read(&F2FS_I(inode)->i_xattr_sem);
533	error = lookup_all_xattrs(inode, ipage, index, len, name,
534				&entry, &base_addr, &base_size, &is_inline);
535	if (!ipage)
536		f2fs_up_read(&F2FS_I(inode)->i_xattr_sem);
537	if (error)
538		return error;
539
540	size = le16_to_cpu(entry->e_value_size);
541
542	if (buffer && size > buffer_size) {
543		error = -ERANGE;
544		goto out;
545	}
546
547	if (buffer) {
548		char *pval = entry->e_name + entry->e_name_len;
549
550		if (base_size - (pval - (char *)base_addr) < size) {
551			error = -ERANGE;
552			goto out;
553		}
554		memcpy(buffer, pval, size);
555	}
556	error = size;
557out:
558	xattr_free(F2FS_I_SB(inode), base_addr, is_inline);
559	return error;
560}
561
562ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
563{
564	struct inode *inode = d_inode(dentry);
565	struct f2fs_xattr_entry *entry;
566	void *base_addr, *last_base_addr;
567	int error;
568	size_t rest = buffer_size;
569
570	f2fs_down_read(&F2FS_I(inode)->i_xattr_sem);
571	error = read_all_xattrs(inode, NULL, &base_addr);
572	f2fs_up_read(&F2FS_I(inode)->i_xattr_sem);
573	if (error)
574		return error;
575
576	last_base_addr = (void *)base_addr + XATTR_SIZE(inode);
577
578	list_for_each_xattr(entry, base_addr) {
579		const char *prefix;
580		size_t prefix_len;
581		size_t size;
582
583		prefix = f2fs_xattr_prefix(entry->e_name_index, dentry);
584
585		if ((void *)(entry) + sizeof(__u32) > last_base_addr ||
586			(void *)XATTR_NEXT_ENTRY(entry) > last_base_addr) {
587			f2fs_err(F2FS_I_SB(inode), "list inode (%lu) has corrupted xattr",
588						inode->i_ino);
589			set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK);
590			f2fs_handle_error(F2FS_I_SB(inode),
591						ERROR_CORRUPTED_XATTR);
592			break;
593		}
594
595		if (!prefix)
596			continue;
597
598		prefix_len = strlen(prefix);
599		size = prefix_len + entry->e_name_len + 1;
600		if (buffer) {
601			if (size > rest) {
602				error = -ERANGE;
603				goto cleanup;
604			}
605			memcpy(buffer, prefix, prefix_len);
606			buffer += prefix_len;
607			memcpy(buffer, entry->e_name, entry->e_name_len);
608			buffer += entry->e_name_len;
609			*buffer++ = 0;
610		}
611		rest -= size;
612	}
613	error = buffer_size - rest;
614cleanup:
615	kfree(base_addr);
616	return error;
617}
618
619static bool f2fs_xattr_value_same(struct f2fs_xattr_entry *entry,
620					const void *value, size_t size)
621{
622	void *pval = entry->e_name + entry->e_name_len;
623
624	return (le16_to_cpu(entry->e_value_size) == size) &&
625					!memcmp(pval, value, size);
626}
627
628static int __f2fs_setxattr(struct inode *inode, int index,
629			const char *name, const void *value, size_t size,
630			struct page *ipage, int flags)
631{
632	struct f2fs_xattr_entry *here, *last;
633	void *base_addr, *last_base_addr;
634	int found, newsize;
635	size_t len;
636	__u32 new_hsize;
637	int error;
638
639	if (name == NULL)
640		return -EINVAL;
641
642	if (value == NULL)
643		size = 0;
644
645	len = strlen(name);
646
647	if (len > F2FS_NAME_LEN)
648		return -ERANGE;
649
650	if (size > MAX_VALUE_LEN(inode))
651		return -E2BIG;
652retry:
653	error = read_all_xattrs(inode, ipage, &base_addr);
654	if (error)
655		return error;
656
657	last_base_addr = (void *)base_addr + XATTR_SIZE(inode);
658
659	/* find entry with wanted name. */
660	here = __find_xattr(base_addr, last_base_addr, NULL, index, len, name);
661	if (!here) {
662		if (!F2FS_I(inode)->i_xattr_nid) {
663			error = f2fs_recover_xattr_data(inode, NULL);
664			f2fs_notice(F2FS_I_SB(inode),
665				"recover xattr in inode (%lu), error(%d)",
666					inode->i_ino, error);
667			if (!error) {
668				kfree(base_addr);
669				goto retry;
670			}
671		}
672		f2fs_err(F2FS_I_SB(inode), "set inode (%lu) has corrupted xattr",
673								inode->i_ino);
674		set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK);
675		error = -EFSCORRUPTED;
676		f2fs_handle_error(F2FS_I_SB(inode),
677					ERROR_CORRUPTED_XATTR);
678		goto exit;
679	}
680
681	found = IS_XATTR_LAST_ENTRY(here) ? 0 : 1;
682
683	if (found) {
684		if ((flags & XATTR_CREATE)) {
685			error = -EEXIST;
686			goto exit;
687		}
688
689		if (value && f2fs_xattr_value_same(here, value, size))
690			goto same;
691	} else if ((flags & XATTR_REPLACE)) {
692		error = -ENODATA;
693		goto exit;
694	}
695
696	last = here;
697	while (!IS_XATTR_LAST_ENTRY(last)) {
698		if ((void *)(last) + sizeof(__u32) > last_base_addr ||
699			(void *)XATTR_NEXT_ENTRY(last) > last_base_addr) {
700			f2fs_err(F2FS_I_SB(inode), "inode (%lu) has invalid last xattr entry, entry_size: %zu",
701					inode->i_ino, ENTRY_SIZE(last));
702			set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK);
703			error = -EFSCORRUPTED;
704			f2fs_handle_error(F2FS_I_SB(inode),
705						ERROR_CORRUPTED_XATTR);
706			goto exit;
707		}
708		last = XATTR_NEXT_ENTRY(last);
709	}
710
711	newsize = XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) + len + size);
712
713	/* 1. Check space */
714	if (value) {
715		int free;
716		/*
717		 * If value is NULL, it is remove operation.
718		 * In case of update operation, we calculate free.
719		 */
720		free = MIN_OFFSET(inode) - ((char *)last - (char *)base_addr);
721		if (found)
722			free = free + ENTRY_SIZE(here);
723
724		if (unlikely(free < newsize)) {
725			error = -E2BIG;
726			goto exit;
727		}
728	}
729
730	/* 2. Remove old entry */
731	if (found) {
732		/*
733		 * If entry is found, remove old entry.
734		 * If not found, remove operation is not needed.
735		 */
736		struct f2fs_xattr_entry *next = XATTR_NEXT_ENTRY(here);
737		int oldsize = ENTRY_SIZE(here);
738
739		memmove(here, next, (char *)last - (char *)next);
740		last = (struct f2fs_xattr_entry *)((char *)last - oldsize);
741		memset(last, 0, oldsize);
742	}
743
744	new_hsize = (char *)last - (char *)base_addr;
745
746	/* 3. Write new entry */
747	if (value) {
748		char *pval;
749		/*
750		 * Before we come here, old entry is removed.
751		 * We just write new entry.
752		 */
753		last->e_name_index = index;
754		last->e_name_len = len;
755		memcpy(last->e_name, name, len);
756		pval = last->e_name + len;
757		memcpy(pval, value, size);
758		last->e_value_size = cpu_to_le16(size);
759		new_hsize += newsize;
760		/*
761		 * Explicitly add the null terminator.  The unused xattr space
762		 * is supposed to always be zeroed, which would make this
763		 * unnecessary, but don't depend on that.
764		 */
765		*(u32 *)((u8 *)last + newsize) = 0;
766	}
767
768	error = write_all_xattrs(inode, new_hsize, base_addr, ipage);
769	if (error)
770		goto exit;
771
772	if (index == F2FS_XATTR_INDEX_ENCRYPTION &&
773			!strcmp(name, F2FS_XATTR_NAME_ENCRYPTION_CONTEXT))
774		f2fs_set_encrypted_inode(inode);
775	if (S_ISDIR(inode->i_mode))
776		set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_CP);
777
778same:
779	if (is_inode_flag_set(inode, FI_ACL_MODE)) {
780		inode->i_mode = F2FS_I(inode)->i_acl_mode;
781		clear_inode_flag(inode, FI_ACL_MODE);
782	}
783
784	inode_set_ctime_current(inode);
785	f2fs_mark_inode_dirty_sync(inode, true);
786exit:
787	kfree(base_addr);
788	return error;
789}
790
791int f2fs_setxattr(struct inode *inode, int index, const char *name,
792				const void *value, size_t size,
793				struct page *ipage, int flags)
794{
795	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
796	int err;
797
798	if (unlikely(f2fs_cp_error(sbi)))
799		return -EIO;
800	if (!f2fs_is_checkpoint_ready(sbi))
801		return -ENOSPC;
802
803	err = f2fs_dquot_initialize(inode);
804	if (err)
805		return err;
806
807	/* this case is only from f2fs_init_inode_metadata */
808	if (ipage)
809		return __f2fs_setxattr(inode, index, name, value,
810						size, ipage, flags);
811	f2fs_balance_fs(sbi, true);
812
813	f2fs_lock_op(sbi);
814	f2fs_down_write(&F2FS_I(inode)->i_xattr_sem);
815	err = __f2fs_setxattr(inode, index, name, value, size, ipage, flags);
816	f2fs_up_write(&F2FS_I(inode)->i_xattr_sem);
817	f2fs_unlock_op(sbi);
818
819	f2fs_update_time(sbi, REQ_TIME);
820	return err;
821}
822
823int f2fs_init_xattr_caches(struct f2fs_sb_info *sbi)
824{
825	dev_t dev = sbi->sb->s_bdev->bd_dev;
826	char slab_name[32];
827
828	sprintf(slab_name, "f2fs_xattr_entry-%u:%u", MAJOR(dev), MINOR(dev));
829
830	sbi->inline_xattr_slab_size = F2FS_OPTION(sbi).inline_xattr_size *
831					sizeof(__le32) + XATTR_PADDING_SIZE;
832
833	sbi->inline_xattr_slab = f2fs_kmem_cache_create(slab_name,
834					sbi->inline_xattr_slab_size);
835	if (!sbi->inline_xattr_slab)
836		return -ENOMEM;
837
838	return 0;
839}
840
841void f2fs_destroy_xattr_caches(struct f2fs_sb_info *sbi)
842{
843	kmem_cache_destroy(sbi->inline_xattr_slab);
844}
845