xattr.c

  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 struct kmem_cache *inline_xattr_slab;
 27static void *xattr_alloc(struct f2fs_sb_info *sbi, int size, bool *is_inline)
 28{
 29	if (likely(size == DEFAULT_XATTR_SLAB_SIZE)) {
 30		*is_inline = true;
 31		return f2fs_kmem_cache_alloc(inline_xattr_slab,
 32					GFP_F2FS_ZERO, false, sbi);
 33	}
 34	*is_inline = false;
 35	return f2fs_kzalloc(sbi, size, GFP_NOFS);
 36}
 37
 38static void xattr_free(struct f2fs_sb_info *sbi, void *xattr_addr,
 39							bool is_inline)
 40{
 41	if (is_inline)
 42		kmem_cache_free(inline_xattr_slab, xattr_addr);
 43	else
 44		kfree(xattr_addr);
 45}
 46
 47static int f2fs_xattr_generic_get(const struct xattr_handler *handler,
 48		struct dentry *unused, struct inode *inode,
 49		const char *name, void *buffer, size_t size)
 50{
 51	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 52
 53	switch (handler->flags) {
 54	case F2FS_XATTR_INDEX_USER:
 55		if (!test_opt(sbi, XATTR_USER))
 56			return -EOPNOTSUPP;
 57		break;
 58	case F2FS_XATTR_INDEX_TRUSTED:
 59	case F2FS_XATTR_INDEX_SECURITY:
 60		break;
 61	default:
 62		return -EINVAL;
 63	}
 64	return f2fs_getxattr(inode, handler->flags, name,
 65			     buffer, size, NULL);
 66}
 67
 68static int f2fs_xattr_generic_set(const struct xattr_handler *handler,
 69		struct mnt_idmap *idmap,
 70		struct dentry *unused, struct inode *inode,
 71		const char *name, const void *value,
 72		size_t size, int flags)
 73{
 74	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 75
 76	switch (handler->flags) {
 77	case F2FS_XATTR_INDEX_USER:
 78		if (!test_opt(sbi, XATTR_USER))
 79			return -EOPNOTSUPP;
 80		break;
 81	case F2FS_XATTR_INDEX_TRUSTED:
 82	case F2FS_XATTR_INDEX_SECURITY:
 83		break;
 84	default:
 85		return -EINVAL;
 86	}
 87	return f2fs_setxattr(inode, handler->flags, name,
 88					value, size, NULL, flags);
 89}
 90
 91static bool f2fs_xattr_user_list(struct dentry *dentry)
 92{
 93	struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
 94
 95	return test_opt(sbi, XATTR_USER);
 96}
 97
 98static bool f2fs_xattr_trusted_list(struct dentry *dentry)
 99{
100	return capable(CAP_SYS_ADMIN);
101}
102
103static int f2fs_xattr_advise_get(const struct xattr_handler *handler,
104		struct dentry *unused, struct inode *inode,
105		const char *name, void *buffer, size_t size)
106{
107	if (buffer)
108		*((char *)buffer) = F2FS_I(inode)->i_advise;
109	return sizeof(char);
110}
111
112static int f2fs_xattr_advise_set(const struct xattr_handler *handler,
113		struct mnt_idmap *idmap,
114		struct dentry *unused, struct inode *inode,
115		const char *name, const void *value,
116		size_t size, int flags)
117{
118	unsigned char old_advise = F2FS_I(inode)->i_advise;
119	unsigned char new_advise;
120
121	if (!inode_owner_or_capable(&nop_mnt_idmap, inode))
122		return -EPERM;
123	if (value == NULL)
124		return -EINVAL;
125
126	new_advise = *(char *)value;
127	if (new_advise & ~FADVISE_MODIFIABLE_BITS)
128		return -EINVAL;
129
130	new_advise = new_advise & FADVISE_MODIFIABLE_BITS;
131	new_advise |= old_advise & ~FADVISE_MODIFIABLE_BITS;
132
133	F2FS_I(inode)->i_advise = new_advise;
134	f2fs_mark_inode_dirty_sync(inode, true);
135	return 0;
136}
137
138#ifdef CONFIG_F2FS_FS_SECURITY
139static int f2fs_initxattrs(struct inode *inode, const struct xattr *xattr_array,
140		void *folio)
141{
142	const struct xattr *xattr;
143	int err = 0;
144
145	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
146		err = f2fs_setxattr(inode, F2FS_XATTR_INDEX_SECURITY,
147				xattr->name, xattr->value,
148				xattr->value_len, folio, 0);
149		if (err < 0)
150			break;
151	}
152	return err;
153}
154
155int f2fs_init_security(struct inode *inode, struct inode *dir,
156				const struct qstr *qstr, struct folio *ifolio)
157{
158	return security_inode_init_security(inode, dir, qstr,
159				f2fs_initxattrs, ifolio);
160}
161#endif
162
163const struct xattr_handler f2fs_xattr_user_handler = {
164	.prefix	= XATTR_USER_PREFIX,
165	.flags	= F2FS_XATTR_INDEX_USER,
166	.list	= f2fs_xattr_user_list,
167	.get	= f2fs_xattr_generic_get,
168	.set	= f2fs_xattr_generic_set,
169};
170
171const struct xattr_handler f2fs_xattr_trusted_handler = {
172	.prefix	= XATTR_TRUSTED_PREFIX,
173	.flags	= F2FS_XATTR_INDEX_TRUSTED,
174	.list	= f2fs_xattr_trusted_list,
175	.get	= f2fs_xattr_generic_get,
176	.set	= f2fs_xattr_generic_set,
177};
178
179const struct xattr_handler f2fs_xattr_advise_handler = {
180	.name	= F2FS_SYSTEM_ADVISE_NAME,
181	.flags	= F2FS_XATTR_INDEX_ADVISE,
182	.get	= f2fs_xattr_advise_get,
183	.set	= f2fs_xattr_advise_set,
184};
185
186const struct xattr_handler f2fs_xattr_security_handler = {
187	.prefix	= XATTR_SECURITY_PREFIX,
188	.flags	= F2FS_XATTR_INDEX_SECURITY,
189	.get	= f2fs_xattr_generic_get,
190	.set	= f2fs_xattr_generic_set,
191};
192
193static const struct xattr_handler * const f2fs_xattr_handler_map[] = {
194	[F2FS_XATTR_INDEX_USER] = &f2fs_xattr_user_handler,
195#ifdef CONFIG_F2FS_FS_POSIX_ACL
196	[F2FS_XATTR_INDEX_POSIX_ACL_ACCESS] = &nop_posix_acl_access,
197	[F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT] = &nop_posix_acl_default,
198#endif
199	[F2FS_XATTR_INDEX_TRUSTED] = &f2fs_xattr_trusted_handler,
200#ifdef CONFIG_F2FS_FS_SECURITY
201	[F2FS_XATTR_INDEX_SECURITY] = &f2fs_xattr_security_handler,
202#endif
203	[F2FS_XATTR_INDEX_ADVISE] = &f2fs_xattr_advise_handler,
204};
205
206const struct xattr_handler * const f2fs_xattr_handlers[] = {
207	&f2fs_xattr_user_handler,
208	&f2fs_xattr_trusted_handler,
209#ifdef CONFIG_F2FS_FS_SECURITY
210	&f2fs_xattr_security_handler,
211#endif
212	&f2fs_xattr_advise_handler,
213	NULL,
214};
215
216static inline const char *f2fs_xattr_prefix(int index,
217					    struct dentry *dentry)
218{
219	const struct xattr_handler *handler = NULL;
220
221	if (index > 0 && index < ARRAY_SIZE(f2fs_xattr_handler_map))
222		handler = f2fs_xattr_handler_map[index];
223
224	if (!xattr_handler_can_list(handler, dentry))
225		return NULL;
226
227	return xattr_prefix(handler);
228}
229
230static struct f2fs_xattr_entry *__find_xattr(void *base_addr,
231				void *last_base_addr, void **last_addr,
232				int index, size_t len, const char *name)
233{
234	struct f2fs_xattr_entry *entry;
235
236	list_for_each_xattr(entry, base_addr) {
237		if ((void *)(entry) + sizeof(__u32) > last_base_addr ||
238			(void *)XATTR_NEXT_ENTRY(entry) > last_base_addr) {
239			if (last_addr)
240				*last_addr = entry;
241			return NULL;
242		}
243
244		if (entry->e_name_index != index)
245			continue;
246		if (entry->e_name_len != len)
247			continue;
248		if (!memcmp(entry->e_name, name, len))
249			break;
250	}
251	return entry;
252}
253
254static struct f2fs_xattr_entry *__find_inline_xattr(struct inode *inode,
255				void *base_addr, void **last_addr, int index,
256				size_t len, const char *name)
257{
258	struct f2fs_xattr_entry *entry;
259	unsigned int inline_size = inline_xattr_size(inode);
260	void *max_addr = base_addr + inline_size;
261
262	entry = __find_xattr(base_addr, max_addr, last_addr, index, len, name);
263	if (!entry)
264		return NULL;
265
266	/* inline xattr header or entry across max inline xattr size */
267	if (IS_XATTR_LAST_ENTRY(entry) &&
268		(void *)entry + sizeof(__u32) > max_addr) {
269		*last_addr = entry;
270		return NULL;
271	}
272	return entry;
273}
274
275static int read_inline_xattr(struct inode *inode, struct folio *ifolio,
276							void *txattr_addr)
277{
278	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
279	unsigned int inline_size = inline_xattr_size(inode);
280	struct folio *folio = NULL;
281	void *inline_addr;
282
283	if (ifolio) {
284		inline_addr = inline_xattr_addr(inode, ifolio);
285	} else {
286		folio = f2fs_get_inode_folio(sbi, inode->i_ino);
287		if (IS_ERR(folio))
288			return PTR_ERR(folio);
289
290		inline_addr = inline_xattr_addr(inode, folio);
291	}
292	memcpy(txattr_addr, inline_addr, inline_size);
293	f2fs_folio_put(folio, true);
294
295	return 0;
296}
297
298static int read_xattr_block(struct inode *inode, void *txattr_addr)
299{
300	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
301	nid_t xnid = F2FS_I(inode)->i_xattr_nid;
302	unsigned int inline_size = inline_xattr_size(inode);
303	struct folio *xfolio;
304	void *xattr_addr;
305
306	/* The inode already has an extended attribute block. */
307	xfolio = f2fs_get_xnode_folio(sbi, xnid);
308	if (IS_ERR(xfolio))
309		return PTR_ERR(xfolio);
310
311	xattr_addr = folio_address(xfolio);
312	memcpy(txattr_addr + inline_size, xattr_addr, VALID_XATTR_BLOCK_SIZE);
313	f2fs_folio_put(xfolio, true);
314
315	return 0;
316}
317
318static int lookup_all_xattrs(struct inode *inode, struct folio *ifolio,
319				unsigned int index, unsigned int len,
320				const char *name, struct f2fs_xattr_entry **xe,
321				void **base_addr, int *base_size,
322				bool *is_inline)
323{
324	void *cur_addr, *txattr_addr, *last_txattr_addr;
325	void *last_addr = NULL;
326	nid_t xnid = F2FS_I(inode)->i_xattr_nid;
327	unsigned int inline_size = inline_xattr_size(inode);
328	int err;
329
330	if (!xnid && !inline_size)
331		return -ENODATA;
332
333	*base_size = XATTR_SIZE(inode) + XATTR_PADDING_SIZE;
334	txattr_addr = xattr_alloc(F2FS_I_SB(inode), *base_size, is_inline);
335	if (!txattr_addr)
336		return -ENOMEM;
337
338	last_txattr_addr = (void *)txattr_addr + XATTR_SIZE(inode);
339
340	/* read from inline xattr */
341	if (inline_size) {
342		err = read_inline_xattr(inode, ifolio, txattr_addr);
343		if (err)
344			goto out;
345
346		*xe = __find_inline_xattr(inode, txattr_addr, &last_addr,
347						index, len, name);
348		if (*xe) {
349			*base_size = inline_size;
350			goto check;
351		}
352	}
353
354	/* read from xattr node block */
355	if (xnid) {
356		err = read_xattr_block(inode, txattr_addr);
357		if (err)
358			goto out;
359	}
360
361	if (last_addr)
362		cur_addr = XATTR_HDR(last_addr) - 1;
363	else
364		cur_addr = txattr_addr;
365
366	*xe = __find_xattr(cur_addr, last_txattr_addr, NULL, index, len, name);
367	if (!*xe) {
368		f2fs_err(F2FS_I_SB(inode), "lookup inode (%lu) has corrupted xattr",
369								inode->i_ino);
370		set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK);
371		err = -ENODATA;
372		f2fs_handle_error(F2FS_I_SB(inode),
373					ERROR_CORRUPTED_XATTR);
374		goto out;
375	}
376check:
377	if (IS_XATTR_LAST_ENTRY(*xe)) {
378		err = -ENODATA;
379		goto out;
380	}
381
382	*base_addr = txattr_addr;
383	return 0;
384out:
385	xattr_free(F2FS_I_SB(inode), txattr_addr, *is_inline);
386	return err;
387}
388
389static int read_all_xattrs(struct inode *inode, struct folio *ifolio,
390							void **base_addr)
391{
392	struct f2fs_xattr_header *header;
393	nid_t xnid = F2FS_I(inode)->i_xattr_nid;
394	unsigned int size = VALID_XATTR_BLOCK_SIZE;
395	unsigned int inline_size = inline_xattr_size(inode);
396	void *txattr_addr;
397	int err;
398
399	txattr_addr = f2fs_kzalloc(F2FS_I_SB(inode),
400			inline_size + size + XATTR_PADDING_SIZE, GFP_NOFS);
401	if (!txattr_addr)
402		return -ENOMEM;
403
404	/* read from inline xattr */
405	if (inline_size) {
406		err = read_inline_xattr(inode, ifolio, txattr_addr);
407		if (err)
408			goto fail;
409	}
410
411	/* read from xattr node block */
412	if (xnid) {
413		err = read_xattr_block(inode, txattr_addr);
414		if (err)
415			goto fail;
416	}
417
418	header = XATTR_HDR(txattr_addr);
419
420	/* never been allocated xattrs */
421	if (le32_to_cpu(header->h_magic) != F2FS_XATTR_MAGIC) {
422		header->h_magic = cpu_to_le32(F2FS_XATTR_MAGIC);
423		header->h_refcount = cpu_to_le32(1);
424	}
425	*base_addr = txattr_addr;
426	return 0;
427fail:
428	kfree(txattr_addr);
429	return err;
430}
431
432static inline int write_all_xattrs(struct inode *inode, __u32 hsize,
433				void *txattr_addr, struct folio *ifolio)
434{
435	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
436	size_t inline_size = inline_xattr_size(inode);
437	struct folio *in_folio = NULL;
438	void *xattr_addr;
439	void *inline_addr = NULL;
440	struct folio *xfolio;
441	nid_t new_nid = 0;
442	int err = 0;
443
444	if (hsize > inline_size && !F2FS_I(inode)->i_xattr_nid)
445		if (!f2fs_alloc_nid(sbi, &new_nid))
446			return -ENOSPC;
447
448	/* write to inline xattr */
449	if (inline_size) {
450		if (ifolio) {
451			inline_addr = inline_xattr_addr(inode, ifolio);
452		} else {
453			in_folio = f2fs_get_inode_folio(sbi, inode->i_ino);
454			if (IS_ERR(in_folio)) {
455				f2fs_alloc_nid_failed(sbi, new_nid);
456				return PTR_ERR(in_folio);
457			}
458			inline_addr = inline_xattr_addr(inode, in_folio);
459		}
460
461		f2fs_folio_wait_writeback(ifolio ? ifolio : in_folio,
462							NODE, true, true);
463		/* no need to use xattr node block */
464		if (hsize <= inline_size) {
465			err = f2fs_truncate_xattr_node(inode);
466			f2fs_alloc_nid_failed(sbi, new_nid);
467			if (err) {
468				f2fs_folio_put(in_folio, true);
469				return err;
470			}
471			memcpy(inline_addr, txattr_addr, inline_size);
472			folio_mark_dirty(ifolio ? ifolio : in_folio);
473			goto in_page_out;
474		}
475	}
476
477	/* write to xattr node block */
478	if (F2FS_I(inode)->i_xattr_nid) {
479		xfolio = f2fs_get_xnode_folio(sbi, F2FS_I(inode)->i_xattr_nid);
480		if (IS_ERR(xfolio)) {
481			err = PTR_ERR(xfolio);
482			f2fs_alloc_nid_failed(sbi, new_nid);
483			goto in_page_out;
484		}
485		f2fs_bug_on(sbi, new_nid);
486		f2fs_folio_wait_writeback(xfolio, NODE, true, true);
487	} else {
488		struct dnode_of_data dn;
489
490		set_new_dnode(&dn, inode, NULL, NULL, new_nid);
491		xfolio = f2fs_new_node_folio(&dn, XATTR_NODE_OFFSET);
492		if (IS_ERR(xfolio)) {
493			err = PTR_ERR(xfolio);
494			f2fs_alloc_nid_failed(sbi, new_nid);
495			goto in_page_out;
496		}
497		f2fs_alloc_nid_done(sbi, new_nid);
498	}
499	xattr_addr = folio_address(xfolio);
500
501	if (inline_size)
502		memcpy(inline_addr, txattr_addr, inline_size);
503	memcpy(xattr_addr, txattr_addr + inline_size, VALID_XATTR_BLOCK_SIZE);
504
505	if (inline_size)
506		folio_mark_dirty(ifolio ? ifolio : in_folio);
507	folio_mark_dirty(xfolio);
508
509	f2fs_folio_put(xfolio, true);
510in_page_out:
511	f2fs_folio_put(in_folio, true);
512	return err;
513}
514
515int f2fs_getxattr(struct inode *inode, int index, const char *name,
516		void *buffer, size_t buffer_size, struct folio *ifolio)
517{
518	struct f2fs_xattr_entry *entry = NULL;
519	int error;
520	unsigned int size, len;
521	void *base_addr = NULL;
522	int base_size;
523	bool is_inline;
524
525	if (name == NULL)
526		return -EINVAL;
527
528	len = strlen(name);
529	if (len > F2FS_NAME_LEN)
530		return -ERANGE;
531
532	if (!ifolio)
533		f2fs_down_read(&F2FS_I(inode)->i_xattr_sem);
534	error = lookup_all_xattrs(inode, ifolio, index, len, name,
535				&entry, &base_addr, &base_size, &is_inline);
536	if (!ifolio)
537		f2fs_up_read(&F2FS_I(inode)->i_xattr_sem);
538	if (error)
539		return error;
540
541	size = le16_to_cpu(entry->e_value_size);
542
543	if (buffer && size > buffer_size) {
544		error = -ERANGE;
545		goto out;
546	}
547
548	if (buffer) {
549		char *pval = entry->e_name + entry->e_name_len;
550
551		if (base_size - (pval - (char *)base_addr) < size) {
552			error = -ERANGE;
553			goto out;
554		}
555		memcpy(buffer, pval, size);
556	}
557	error = size;
558out:
559	xattr_free(F2FS_I_SB(inode), base_addr, is_inline);
560	return error;
561}
562
563ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
564{
565	struct inode *inode = d_inode(dentry);
566	struct f2fs_xattr_entry *entry;
567	void *base_addr, *last_base_addr;
568	int error;
569	size_t rest = buffer_size;
570
571	f2fs_down_read(&F2FS_I(inode)->i_xattr_sem);
572	error = read_all_xattrs(inode, NULL, &base_addr);
573	f2fs_up_read(&F2FS_I(inode)->i_xattr_sem);
574	if (error)
575		return error;
576
577	last_base_addr = (void *)base_addr + XATTR_SIZE(inode);
578
579	list_for_each_xattr(entry, base_addr) {
580		const char *prefix;
581		size_t prefix_len;
582		size_t size;
583
584		prefix = f2fs_xattr_prefix(entry->e_name_index, dentry);
585
586		if ((void *)(entry) + sizeof(__u32) > last_base_addr ||
587			(void *)XATTR_NEXT_ENTRY(entry) > last_base_addr) {
588			f2fs_err(F2FS_I_SB(inode), "list inode (%lu) has corrupted xattr",
589						inode->i_ino);
590			set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK);
591			f2fs_handle_error(F2FS_I_SB(inode),
592						ERROR_CORRUPTED_XATTR);
593			break;
594		}
595
596		if (!prefix)
597			continue;
598
599		prefix_len = strlen(prefix);
600		size = prefix_len + entry->e_name_len + 1;
601		if (buffer) {
602			if (size > rest) {
603				error = -ERANGE;
604				goto cleanup;
605			}
606			memcpy(buffer, prefix, prefix_len);
607			buffer += prefix_len;
608			memcpy(buffer, entry->e_name, entry->e_name_len);
609			buffer += entry->e_name_len;
610			*buffer++ = 0;
611		}
612		rest -= size;
613	}
614	error = buffer_size - rest;
615cleanup:
616	kfree(base_addr);
617	return error;
618}
619
620static bool f2fs_xattr_value_same(struct f2fs_xattr_entry *entry,
621					const void *value, size_t size)
622{
623	void *pval = entry->e_name + entry->e_name_len;
624
625	return (le16_to_cpu(entry->e_value_size) == size) &&
626					!memcmp(pval, value, size);
627}
628
629static int __f2fs_setxattr(struct inode *inode, int index,
630			const char *name, const void *value, size_t size,
631			struct folio *ifolio, int flags)
632{
633	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
634	struct f2fs_xattr_entry *here, *last;
635	void *base_addr, *last_base_addr;
636	int found, newsize;
637	size_t len;
638	__u32 new_hsize;
639	int error;
640
641	if (name == NULL)
642		return -EINVAL;
643
644	if (value == NULL)
645		size = 0;
646
647	len = strlen(name);
648
649	if (len > F2FS_NAME_LEN)
650		return -ERANGE;
651
652	if (size > MAX_VALUE_LEN(inode))
653		return -E2BIG;
654retry:
655	error = read_all_xattrs(inode, ifolio, &base_addr);
656	if (error)
657		return error;
658
659	last_base_addr = (void *)base_addr + XATTR_SIZE(inode);
660
661	/* find entry with wanted name. */
662	here = __find_xattr(base_addr, last_base_addr, NULL, index, len, name);
663	if (!here) {
664		if (!F2FS_I(inode)->i_xattr_nid) {
665			error = f2fs_recover_xattr_data(inode, NULL);
666			f2fs_notice(F2FS_I_SB(inode),
667				"recover xattr in inode (%lu), error(%d)",
668					inode->i_ino, error);
669			if (!error) {
670				kfree(base_addr);
671				goto retry;
672			}
673		}
674		f2fs_err(F2FS_I_SB(inode), "set inode (%lu) has corrupted xattr",
675								inode->i_ino);
676		set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK);
677		error = -EFSCORRUPTED;
678		f2fs_handle_error(F2FS_I_SB(inode),
679					ERROR_CORRUPTED_XATTR);
680		goto exit;
681	}
682
683	found = IS_XATTR_LAST_ENTRY(here) ? 0 : 1;
684
685	if (found) {
686		if ((flags & XATTR_CREATE)) {
687			error = -EEXIST;
688			goto exit;
689		}
690
691		if (value && f2fs_xattr_value_same(here, value, size))
692			goto same;
693	} else if ((flags & XATTR_REPLACE)) {
694		error = -ENODATA;
695		goto exit;
696	}
697
698	last = here;
699	while (!IS_XATTR_LAST_ENTRY(last)) {
700		if ((void *)(last) + sizeof(__u32) > last_base_addr ||
701			(void *)XATTR_NEXT_ENTRY(last) > last_base_addr) {
702			f2fs_err(F2FS_I_SB(inode), "inode (%lu) has invalid last xattr entry, entry_size: %zu",
703					inode->i_ino, ENTRY_SIZE(last));
704			set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK);
705			error = -EFSCORRUPTED;
706			f2fs_handle_error(F2FS_I_SB(inode),
707						ERROR_CORRUPTED_XATTR);
708			goto exit;
709		}
710		last = XATTR_NEXT_ENTRY(last);
711	}
712
713	newsize = XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) + len + size);
714
715	/* 1. Check space */
716	if (value) {
717		int free;
718		/*
719		 * If value is NULL, it is remove operation.
720		 * In case of update operation, we calculate free.
721		 */
722		free = MIN_OFFSET(inode) - ((char *)last - (char *)base_addr);
723		if (found)
724			free = free + ENTRY_SIZE(here);
725
726		if (unlikely(free < newsize)) {
727			error = -E2BIG;
728			goto exit;
729		}
730	}
731
732	/* 2. Remove old entry */
733	if (found) {
734		/*
735		 * If entry is found, remove old entry.
736		 * If not found, remove operation is not needed.
737		 */
738		struct f2fs_xattr_entry *next = XATTR_NEXT_ENTRY(here);
739		int oldsize = ENTRY_SIZE(here);
740
741		memmove(here, next, (char *)last - (char *)next);
742		last = (struct f2fs_xattr_entry *)((char *)last - oldsize);
743		memset(last, 0, oldsize);
744	}
745
746	new_hsize = (char *)last - (char *)base_addr;
747
748	/* 3. Write new entry */
749	if (value) {
750		char *pval;
751		/*
752		 * Before we come here, old entry is removed.
753		 * We just write new entry.
754		 */
755		last->e_name_index = index;
756		last->e_name_len = len;
757		memcpy(last->e_name, name, len);
758		pval = last->e_name + len;
759		memcpy(pval, value, size);
760		last->e_value_size = cpu_to_le16(size);
761		new_hsize += newsize;
762		/*
763		 * Explicitly add the null terminator.  The unused xattr space
764		 * is supposed to always be zeroed, which would make this
765		 * unnecessary, but don't depend on that.
766		 */
767		*(u32 *)((u8 *)last + newsize) = 0;
768	}
769
770	error = write_all_xattrs(inode, new_hsize, base_addr, ifolio);
771	if (error)
772		goto exit;
773
774	if (index == F2FS_XATTR_INDEX_ENCRYPTION &&
775			!strcmp(name, F2FS_XATTR_NAME_ENCRYPTION_CONTEXT))
776		f2fs_set_encrypted_inode(inode);
777
778	if (!S_ISDIR(inode->i_mode))
779		goto same;
780	/*
781	 * In restrict mode, fsync() always try to trigger checkpoint for all
782	 * metadata consistency, in other mode, it triggers checkpoint when
783	 * parent's xattr metadata was updated.
784	 */
785	if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT)
786		set_sbi_flag(sbi, SBI_NEED_CP);
787	else
788		f2fs_add_ino_entry(sbi, inode->i_ino, XATTR_DIR_INO);
789same:
790	if (is_inode_flag_set(inode, FI_ACL_MODE)) {
791		inode->i_mode = F2FS_I(inode)->i_acl_mode;
792		clear_inode_flag(inode, FI_ACL_MODE);
793	}
794
795	inode_set_ctime_current(inode);
796	f2fs_mark_inode_dirty_sync(inode, true);
797exit:
798	kfree(base_addr);
799	return error;
800}
801
802int f2fs_setxattr(struct inode *inode, int index, const char *name,
803				const void *value, size_t size,
804				struct folio *ifolio, int flags)
805{
806	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
807	int err;
808
809	if (unlikely(f2fs_cp_error(sbi)))
810		return -EIO;
811	if (!f2fs_is_checkpoint_ready(sbi))
812		return -ENOSPC;
813
814	err = f2fs_dquot_initialize(inode);
815	if (err)
816		return err;
817
818	/* this case is only from f2fs_init_inode_metadata */
819	if (ifolio)
820		return __f2fs_setxattr(inode, index, name, value,
821						size, ifolio, flags);
822	f2fs_balance_fs(sbi, true);
823
824	f2fs_lock_op(sbi);
825	f2fs_down_write(&F2FS_I(inode)->i_xattr_sem);
826	err = __f2fs_setxattr(inode, index, name, value, size, NULL, flags);
827	f2fs_up_write(&F2FS_I(inode)->i_xattr_sem);
828	f2fs_unlock_op(sbi);
829
830	f2fs_update_time(sbi, REQ_TIME);
831	return err;
832}
833
834int __init f2fs_init_xattr_cache(void)
835{
836	inline_xattr_slab = f2fs_kmem_cache_create("f2fs_xattr_entry",
837					DEFAULT_XATTR_SLAB_SIZE);
838	return inline_xattr_slab ? 0 : -ENOMEM;
839}
840
841void f2fs_destroy_xattr_cache(void)
842{
843	kmem_cache_destroy(inline_xattr_slab);
844}