[linux.git] / fs / f2fs / acl.c

/*
 * fs/f2fs/acl.c
 *
 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
 *             http://www.samsung.com/
 *
 * Portions of this code from linux/fs/ext2/acl.c
 *
 * Copyright (C) 2001-2003 Andreas Gruenbacher, <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/f2fs_fs.h>
#include "f2fs.h"
#include "xattr.h"
#include "acl.h"

#define get_inode_mode(i)	((is_inode_flag_set(F2FS_I(i), FI_ACL_MODE)) ? \
					(F2FS_I(i)->i_acl_mode) : ((i)->i_mode))

static inline size_t f2fs_acl_size(int count)
{
	if (count <= 4) {
		return sizeof(struct f2fs_acl_header) +
			count * sizeof(struct f2fs_acl_entry_short);
	} else {
		return sizeof(struct f2fs_acl_header) +
			4 * sizeof(struct f2fs_acl_entry_short) +
			(count - 4) * sizeof(struct f2fs_acl_entry);
	}
}

static inline int f2fs_acl_count(size_t size)
{
	ssize_t s;
	size -= sizeof(struct f2fs_acl_header);
	s = size - 4 * sizeof(struct f2fs_acl_entry_short);
	if (s < 0) {
		if (size % sizeof(struct f2fs_acl_entry_short))
			return -1;
		return size / sizeof(struct f2fs_acl_entry_short);
	} else {
		if (s % sizeof(struct f2fs_acl_entry))
			return -1;
		return s / sizeof(struct f2fs_acl_entry) + 4;
	}
}

static struct posix_acl *f2fs_acl_from_disk(const char *value, size_t size)
{
	int i, count;
	struct posix_acl *acl;
	struct f2fs_acl_header *hdr = (struct f2fs_acl_header *)value;
	struct f2fs_acl_entry *entry = (struct f2fs_acl_entry *)(hdr + 1);
	const char *end = value + size;

	if (hdr->a_version != cpu_to_le32(F2FS_ACL_VERSION))
		return ERR_PTR(-EINVAL);

	count = f2fs_acl_count(size);
	if (count < 0)
		return ERR_PTR(-EINVAL);
	if (count == 0)
		return NULL;

	acl = posix_acl_alloc(count, GFP_KERNEL);
	if (!acl)
		return ERR_PTR(-ENOMEM);

	for (i = 0; i < count; i++) {

		if ((char *)entry > end)
			goto fail;

		acl->a_entries[i].e_tag  = le16_to_cpu(entry->e_tag);
		acl->a_entries[i].e_perm = le16_to_cpu(entry->e_perm);

		switch (acl->a_entries[i].e_tag) {
		case ACL_USER_OBJ:
		case ACL_GROUP_OBJ:
		case ACL_MASK:
		case ACL_OTHER:
			entry = (struct f2fs_acl_entry *)((char *)entry +
					sizeof(struct f2fs_acl_entry_short));
			break;

		case ACL_USER:
			acl->a_entries[i].e_uid =
				make_kuid(&init_user_ns,
						le32_to_cpu(entry->e_id));
			entry = (struct f2fs_acl_entry *)((char *)entry +
					sizeof(struct f2fs_acl_entry));
			break;
		case ACL_GROUP:
			acl->a_entries[i].e_gid =
				make_kgid(&init_user_ns,
						le32_to_cpu(entry->e_id));
			entry = (struct f2fs_acl_entry *)((char *)entry +
					sizeof(struct f2fs_acl_entry));
			break;
		default:
			goto fail;
		}
	}
	if ((char *)entry != end)
		goto fail;
	return acl;
fail:
	posix_acl_release(acl);
	return ERR_PTR(-EINVAL);
}

static void *f2fs_acl_to_disk(const struct posix_acl *acl, size_t *size)
{
	struct f2fs_acl_header *f2fs_acl;
	struct f2fs_acl_entry *entry;
	int i;

	f2fs_acl = kmalloc(sizeof(struct f2fs_acl_header) + acl->a_count *
			sizeof(struct f2fs_acl_entry), GFP_KERNEL);
	if (!f2fs_acl)
		return ERR_PTR(-ENOMEM);

	f2fs_acl->a_version = cpu_to_le32(F2FS_ACL_VERSION);
	entry = (struct f2fs_acl_entry *)(f2fs_acl + 1);

	for (i = 0; i < acl->a_count; i++) {

		entry->e_tag  = cpu_to_le16(acl->a_entries[i].e_tag);
		entry->e_perm = cpu_to_le16(acl->a_entries[i].e_perm);

		switch (acl->a_entries[i].e_tag) {
		case ACL_USER:
			entry->e_id = cpu_to_le32(
					from_kuid(&init_user_ns,
						acl->a_entries[i].e_uid));
			entry = (struct f2fs_acl_entry *)((char *)entry +
					sizeof(struct f2fs_acl_entry));
			break;
		case ACL_GROUP:
			entry->e_id = cpu_to_le32(
					from_kgid(&init_user_ns,
						acl->a_entries[i].e_gid));
			entry = (struct f2fs_acl_entry *)((char *)entry +
					sizeof(struct f2fs_acl_entry));
			break;
		case ACL_USER_OBJ:
		case ACL_GROUP_OBJ:
		case ACL_MASK:
		case ACL_OTHER:
			entry = (struct f2fs_acl_entry *)((char *)entry +
					sizeof(struct f2fs_acl_entry_short));
			break;
		default:
			goto fail;
		}
	}
	*size = f2fs_acl_size(acl->a_count);
	return (void *)f2fs_acl;

fail:
	kfree(f2fs_acl);
	return ERR_PTR(-EINVAL);
}

struct posix_acl *f2fs_get_acl(struct inode *inode, int type)
{
	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
	int name_index = F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT;
	void *value = NULL;
	struct posix_acl *acl;
	int retval;

	if (!test_opt(sbi, POSIX_ACL))
		return NULL;

	acl = get_cached_acl(inode, type);
	if (acl != ACL_NOT_CACHED)
		return acl;

	if (type == ACL_TYPE_ACCESS)
		name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS;

	retval = f2fs_getxattr(inode, name_index, "", NULL, 0);
	if (retval > 0) {
		value = kmalloc(retval, GFP_KERNEL);
		if (!value)
			return ERR_PTR(-ENOMEM);
		retval = f2fs_getxattr(inode, name_index, "", value, retval);
	}

	if (retval > 0)
		acl = f2fs_acl_from_disk(value, retval);
	else if (retval == -ENODATA)
		acl = NULL;
	else
		acl = ERR_PTR(retval);
	kfree(value);

	if (!IS_ERR(acl))
		set_cached_acl(inode, type, acl);

	return acl;
}

static int f2fs_set_acl(struct inode *inode, int type, struct posix_acl *acl)
{
	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
	struct f2fs_inode_info *fi = F2FS_I(inode);
	int name_index;
	void *value = NULL;
	size_t size = 0;
	int error;

	if (!test_opt(sbi, POSIX_ACL))
		return 0;
	if (S_ISLNK(inode->i_mode))
		return -EOPNOTSUPP;

	switch (type) {
	case ACL_TYPE_ACCESS:
		name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS;
		if (acl) {
			error = posix_acl_equiv_mode(acl, &inode->i_mode);
			if (error < 0)
				return error;
			set_acl_inode(fi, inode->i_mode);
			if (error == 0)
				acl = NULL;
		}
		break;

	case ACL_TYPE_DEFAULT:
		name_index = F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT;
		if (!S_ISDIR(inode->i_mode))
			return acl ? -EACCES : 0;
		break;

	default:
		return -EINVAL;
	}

	if (acl) {
		value = f2fs_acl_to_disk(acl, &size);
		if (IS_ERR(value)) {
			cond_clear_inode_flag(fi, FI_ACL_MODE);
			return (int)PTR_ERR(value);
		}
	}

	error = f2fs_setxattr(inode, name_index, "", value, size, NULL);

	kfree(value);
	if (!error)
		set_cached_acl(inode, type, acl);

	cond_clear_inode_flag(fi, FI_ACL_MODE);
	return error;
}

int f2fs_init_acl(struct inode *inode, struct inode *dir)
{
	struct posix_acl *acl = NULL;
	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
	int error = 0;

	if (!S_ISLNK(inode->i_mode)) {
		if (test_opt(sbi, POSIX_ACL)) {
			acl = f2fs_get_acl(dir, ACL_TYPE_DEFAULT);
			if (IS_ERR(acl))
				return PTR_ERR(acl);
		}
		if (!acl)
			inode->i_mode &= ~current_umask();
	}

	if (test_opt(sbi, POSIX_ACL) && acl) {

		if (S_ISDIR(inode->i_mode)) {
			error = f2fs_set_acl(inode, ACL_TYPE_DEFAULT, acl);
			if (error)
				goto cleanup;
		}
		error = posix_acl_create(&acl, GFP_KERNEL, &inode->i_mode);
		if (error < 0)
			return error;
		if (error > 0)
			error = f2fs_set_acl(inode, ACL_TYPE_ACCESS, acl);
	}
cleanup:
	posix_acl_release(acl);
	return error;
}

int f2fs_acl_chmod(struct inode *inode)
{
	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
	struct posix_acl *acl;
	int error;
	umode_t mode = get_inode_mode(inode);

	if (!test_opt(sbi, POSIX_ACL))
		return 0;
	if (S_ISLNK(mode))
		return -EOPNOTSUPP;

	acl = f2fs_get_acl(inode, ACL_TYPE_ACCESS);
	if (IS_ERR(acl) || !acl)
		return PTR_ERR(acl);

	error = posix_acl_chmod(&acl, GFP_KERNEL, mode);
	if (error)
		return error;
	error = f2fs_set_acl(inode, ACL_TYPE_ACCESS, acl);
	posix_acl_release(acl);
	return error;
}

static size_t f2fs_xattr_list_acl(struct dentry *dentry, char *list,
		size_t list_size, const char *name, size_t name_len, int type)
{
	struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
	const char *xname = POSIX_ACL_XATTR_DEFAULT;
	size_t size;

	if (!test_opt(sbi, POSIX_ACL))
		return 0;

	if (type == ACL_TYPE_ACCESS)
		xname = POSIX_ACL_XATTR_ACCESS;

	size = strlen(xname) + 1;
	if (list && size <= list_size)
		memcpy(list, xname, size);
	return size;
}

static int f2fs_xattr_get_acl(struct dentry *dentry, const char *name,
		void *buffer, size_t size, int type)
{
	struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
	struct posix_acl *acl;
	int error;

	if (strcmp(name, "") != 0)
		return -EINVAL;
	if (!test_opt(sbi, POSIX_ACL))
		return -EOPNOTSUPP;

	acl = f2fs_get_acl(dentry->d_inode, type);
	if (IS_ERR(acl))
		return PTR_ERR(acl);
	if (!acl)
		return -ENODATA;
	error = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
	posix_acl_release(acl);

	return error;
}

static int f2fs_xattr_set_acl(struct dentry *dentry, const char *name,
		const void *value, size_t size, int flags, int type)
{
	struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
	struct inode *inode = dentry->d_inode;
	struct posix_acl *acl = NULL;
	int error;

	if (strcmp(name, "") != 0)
		return -EINVAL;
	if (!test_opt(sbi, POSIX_ACL))
		return -EOPNOTSUPP;
	if (!inode_owner_or_capable(inode))
		return -EPERM;

	if (value) {
		acl = posix_acl_from_xattr(&init_user_ns, value, size);
		if (IS_ERR(acl))
			return PTR_ERR(acl);
		if (acl) {
			error = posix_acl_valid(acl);
			if (error)
				goto release_and_out;
		}
	} else {
		acl = NULL;
	}

	error = f2fs_set_acl(inode, type, acl);

release_and_out:
	posix_acl_release(acl);
	return error;
}

const struct xattr_handler f2fs_xattr_acl_default_handler = {
	.prefix = POSIX_ACL_XATTR_DEFAULT,
	.flags = ACL_TYPE_DEFAULT,
	.list = f2fs_xattr_list_acl,
	.get = f2fs_xattr_get_acl,
	.set = f2fs_xattr_set_acl,
};

const struct xattr_handler f2fs_xattr_acl_access_handler = {
	.prefix = POSIX_ACL_XATTR_ACCESS,
	.flags = ACL_TYPE_ACCESS,
	.list = f2fs_xattr_list_acl,
	.get = f2fs_xattr_get_acl,
	.set = f2fs_xattr_set_acl,
};
Commit	Line	Data
0a8165d7	1	/*
af48b85b JK	2	* fs/f2fs/acl.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/acl.c
	8	*
	9	* Copyright (C) 2001-2003 Andreas Gruenbacher, <[email protected]>
	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License version 2 as
	13	* published by the Free Software Foundation.
	14	*/
	15	#include <linux/f2fs_fs.h>
	16	#include "f2fs.h"
	17	#include "xattr.h"
	18	#include "acl.h"
	19
	20	#define get_inode_mode(i) ((is_inode_flag_set(F2FS_I(i), FI_ACL_MODE)) ? \
	21	(F2FS_I(i)->i_acl_mode) : ((i)->i_mode))
	22
	23	static inline size_t f2fs_acl_size(int count)
	24	{
	25	if (count <= 4) {
	26	return sizeof(struct f2fs_acl_header) +
	27	count * sizeof(struct f2fs_acl_entry_short);
	28	} else {
	29	return sizeof(struct f2fs_acl_header) +
	30	4 * sizeof(struct f2fs_acl_entry_short) +
	31	(count - 4) * sizeof(struct f2fs_acl_entry);
	32	}
	33	}
	34
	35	static inline int f2fs_acl_count(size_t size)
	36	{
	37	ssize_t s;
	38	size -= sizeof(struct f2fs_acl_header);
	39	s = size - 4 * sizeof(struct f2fs_acl_entry_short);
	40	if (s < 0) {
	41	if (size % sizeof(struct f2fs_acl_entry_short))
	42	return -1;
	43	return size / sizeof(struct f2fs_acl_entry_short);
	44	} else {
	45	if (s % sizeof(struct f2fs_acl_entry))
	46	return -1;
	47	return s / sizeof(struct f2fs_acl_entry) + 4;
	48	}
	49	}
	50
	51	static struct posix_acl f2fs_acl_from_disk(const char value, size_t size)
	52	{
	53	int i, count;
	54	struct posix_acl *acl;
	55	struct f2fs_acl_header hdr = (struct f2fs_acl_header )value;
	56	struct f2fs_acl_entry entry = (struct f2fs_acl_entry )(hdr + 1);
	57	const char *end = value + size;
	58
	59	if (hdr->a_version != cpu_to_le32(F2FS_ACL_VERSION))
	60	return ERR_PTR(-EINVAL);
	61
	62	count = f2fs_acl_count(size);
	63	if (count < 0)
	64	return ERR_PTR(-EINVAL);
	65	if (count == 0)
66	return NULL;
67
68	acl = posix_acl_alloc(count, GFP_KERNEL);
69	if (!acl)
70	return ERR_PTR(-ENOMEM);
71
72	for (i = 0; i < count; i++) {
73
74	if ((char *)entry > end)
75	goto fail;
76
77	acl->a_entries[i].e_tag = le16_to_cpu(entry->e_tag);
78	acl->a_entries[i].e_perm = le16_to_cpu(entry->e_perm);
79
80	switch (acl->a_entries[i].e_tag) {
81	case ACL_USER_OBJ:
82	case ACL_GROUP_OBJ:
83	case ACL_MASK:
84	case ACL_OTHER:
af48b85b JK	85	entry = (struct f2fs_acl_entry )((char )entry +
	86	sizeof(struct f2fs_acl_entry_short));
	87	break;
	88
	89	case ACL_USER:
	90	acl->a_entries[i].e_uid =
	91	make_kuid(&init_user_ns,
	92	le32_to_cpu(entry->e_id));
	93	entry = (struct f2fs_acl_entry )((char )entry +
	94	sizeof(struct f2fs_acl_entry));
	95	break;
	96	case ACL_GROUP:
	97	acl->a_entries[i].e_gid =
	98	make_kgid(&init_user_ns,
	99	le32_to_cpu(entry->e_id));
	100	entry = (struct f2fs_acl_entry )((char )entry +
	101	sizeof(struct f2fs_acl_entry));
	102	break;
	103	default:
	104	goto fail;
	105	}
	106	}
	107	if ((char *)entry != end)
	108	goto fail;
	109	return acl;
	110	fail:
	111	posix_acl_release(acl);
	112	return ERR_PTR(-EINVAL);
	113	}
	114
	115	static void f2fs_acl_to_disk(const struct posix_acl acl, size_t *size)
	116	{
	117	struct f2fs_acl_header *f2fs_acl;
	118	struct f2fs_acl_entry *entry;
	119	int i;
	120
	121	f2fs_acl = kmalloc(sizeof(struct f2fs_acl_header) + acl->a_count *
	122	sizeof(struct f2fs_acl_entry), GFP_KERNEL);
	123	if (!f2fs_acl)
	124	return ERR_PTR(-ENOMEM);
	125
	126	f2fs_acl->a_version = cpu_to_le32(F2FS_ACL_VERSION);
	127	entry = (struct f2fs_acl_entry *)(f2fs_acl + 1);
	128
	129	for (i = 0; i < acl->a_count; i++) {
	130
	131	entry->e_tag = cpu_to_le16(acl->a_entries[i].e_tag);
	132	entry->e_perm = cpu_to_le16(acl->a_entries[i].e_perm);
	133
	134	switch (acl->a_entries[i].e_tag) {
	135	case ACL_USER:
	136	entry->e_id = cpu_to_le32(
	137	from_kuid(&init_user_ns,
	138	acl->a_entries[i].e_uid));
	139	entry = (struct f2fs_acl_entry )((char )entry +
	140	sizeof(struct f2fs_acl_entry));
	141	break;
	142	case ACL_GROUP:
	143	entry->e_id = cpu_to_le32(
	144	from_kgid(&init_user_ns,
	145	acl->a_entries[i].e_gid));
	146	entry = (struct f2fs_acl_entry )((char )entry +
	147	sizeof(struct f2fs_acl_entry));
	148	break;
149	case ACL_USER_OBJ:
150	case ACL_GROUP_OBJ:
151	case ACL_MASK:
152	case ACL_OTHER:
153	entry = (struct f2fs_acl_entry )((char )entry +
154	sizeof(struct f2fs_acl_entry_short));
155	break;
156	default:
157	goto fail;
158	}
159	}
160	*size = f2fs_acl_size(acl->a_count);
161	return (void *)f2fs_acl;
162
163	fail:
164	kfree(f2fs_acl);
165	return ERR_PTR(-EINVAL);
166	}
167
168	struct posix_acl f2fs_get_acl(struct inode inode, int type)
169	{
170	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
171	int name_index = F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT;
172	void *value = NULL;
173	struct posix_acl *acl;
174	int retval;
175
176	if (!test_opt(sbi, POSIX_ACL))
177	return NULL;
178
179	acl = get_cached_acl(inode, type);
180	if (acl != ACL_NOT_CACHED)
181	return acl;
182
183	if (type == ACL_TYPE_ACCESS)
184	name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS;
185
186	retval = f2fs_getxattr(inode, name_index, "", NULL, 0);
187	if (retval > 0) {
188	value = kmalloc(retval, GFP_KERNEL);
189	if (!value)
190	return ERR_PTR(-ENOMEM);
191	retval = f2fs_getxattr(inode, name_index, "", value, retval);
192	}
193
c1b75eab	194	if (retval > 0)
af48b85b	195	acl = f2fs_acl_from_disk(value, retval);
c1b75eab JK	196	else if (retval == -ENODATA)
	197	acl = NULL;
	198	else
	199	acl = ERR_PTR(retval);
af48b85b	200	kfree(value);
c1b75eab	201
af48b85b JK	202	if (!IS_ERR(acl))
	203	set_cached_acl(inode, type, acl);
	204
	205	return acl;
	206	}
	207
	208	static int f2fs_set_acl(struct inode inode, int type, struct posix_acl acl)
	209	{
	210	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
	211	struct f2fs_inode_info *fi = F2FS_I(inode);
	212	int name_index;
	213	void *value = NULL;
	214	size_t size = 0;
	215	int error;
	216
	217	if (!test_opt(sbi, POSIX_ACL))
	218	return 0;
	219	if (S_ISLNK(inode->i_mode))
	220	return -EOPNOTSUPP;
	221
	222	switch (type) {
	223	case ACL_TYPE_ACCESS:
	224	name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS;
	225	if (acl) {
	226	error = posix_acl_equiv_mode(acl, &inode->i_mode);
	227	if (error < 0)
	228	return error;
	229	set_acl_inode(fi, inode->i_mode);
	230	if (error == 0)
	231	acl = NULL;
	232	}
	233	break;
	234
	235	case ACL_TYPE_DEFAULT:
	236	name_index = F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT;
	237	if (!S_ISDIR(inode->i_mode))
	238	return acl ? -EACCES : 0;
	239	break;
	240
	241	default:
	242	return -EINVAL;
	243	}
	244
	245	if (acl) {
	246	value = f2fs_acl_to_disk(acl, &size);
	247	if (IS_ERR(value)) {
	248	cond_clear_inode_flag(fi, FI_ACL_MODE);
	249	return (int)PTR_ERR(value);
	250	}
	251	}
	252
8ae8f162	253	error = f2fs_setxattr(inode, name_index, "", value, size, NULL);
af48b85b JK	254
	255	kfree(value);
	256	if (!error)
	257	set_cached_acl(inode, type, acl);
	258
	259	cond_clear_inode_flag(fi, FI_ACL_MODE);
	260	return error;
	261	}
	262
	263	int f2fs_init_acl(struct inode inode, struct inode dir)
	264	{
	265	struct posix_acl *acl = NULL;
	266	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
	267	int error = 0;
	268
	269	if (!S_ISLNK(inode->i_mode)) {
	270	if (test_opt(sbi, POSIX_ACL)) {
	271	acl = f2fs_get_acl(dir, ACL_TYPE_DEFAULT);
	272	if (IS_ERR(acl))
	273	return PTR_ERR(acl);
	274	}
	275	if (!acl)
	276	inode->i_mode &= ~current_umask();
	277	}
	278
	279	if (test_opt(sbi, POSIX_ACL) && acl) {
	280
	281	if (S_ISDIR(inode->i_mode)) {
	282	error = f2fs_set_acl(inode, ACL_TYPE_DEFAULT, acl);
	283	if (error)
	284	goto cleanup;
	285	}
	286	error = posix_acl_create(&acl, GFP_KERNEL, &inode->i_mode);
	287	if (error < 0)
	288	return error;
	289	if (error > 0)
	290	error = f2fs_set_acl(inode, ACL_TYPE_ACCESS, acl);
	291	}
	292	cleanup:
	293	posix_acl_release(acl);
	294	return error;
	295	}
	296
	297	int f2fs_acl_chmod(struct inode *inode)
	298	{
	299	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
	300	struct posix_acl *acl;
	301	int error;
0ecc833b	302	umode_t mode = get_inode_mode(inode);
af48b85b JK	303
	304	if (!test_opt(sbi, POSIX_ACL))
	305	return 0;
	306	if (S_ISLNK(mode))
	307	return -EOPNOTSUPP;
	308
	309	acl = f2fs_get_acl(inode, ACL_TYPE_ACCESS);
	310	if (IS_ERR(acl) \|\| !acl)
	311	return PTR_ERR(acl);
	312
	313	error = posix_acl_chmod(&acl, GFP_KERNEL, mode);
	314	if (error)
	315	return error;
	316	error = f2fs_set_acl(inode, ACL_TYPE_ACCESS, acl);
	317	posix_acl_release(acl);
	318	return error;
	319	}
	320
	321	static size_t f2fs_xattr_list_acl(struct dentry dentry, char list,
	322	size_t list_size, const char *name, size_t name_len, int type)
	323	{
	324	struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
	325	const char *xname = POSIX_ACL_XATTR_DEFAULT;
	326	size_t size;
	327
	328	if (!test_opt(sbi, POSIX_ACL))
	329	return 0;
	330
	331	if (type == ACL_TYPE_ACCESS)
	332	xname = POSIX_ACL_XATTR_ACCESS;
	333
	334	size = strlen(xname) + 1;
	335	if (list && size <= list_size)
	336	memcpy(list, xname, size);
	337	return size;
	338	}
	339
	340	static int f2fs_xattr_get_acl(struct dentry dentry, const char name,
	341	void *buffer, size_t size, int type)
	342	{
	343	struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
	344	struct posix_acl *acl;
	345	int error;
	346
	347	if (strcmp(name, "") != 0)
	348	return -EINVAL;
	349	if (!test_opt(sbi, POSIX_ACL))
	350	return -EOPNOTSUPP;
	351
	352	acl = f2fs_get_acl(dentry->d_inode, type);
	353	if (IS_ERR(acl))
	354	return PTR_ERR(acl);
	355	if (!acl)
	356	return -ENODATA;
	357	error = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
	358	posix_acl_release(acl);
	359
	360	return error;
	361	}
	362
	363	static int f2fs_xattr_set_acl(struct dentry dentry, const char name,
	364	const void *value, size_t size, int flags, int type)
	365	{
	366	struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
367	struct inode *inode = dentry->d_inode;
368	struct posix_acl *acl = NULL;
369	int error;
370
371	if (strcmp(name, "") != 0)
372	return -EINVAL;
373	if (!test_opt(sbi, POSIX_ACL))
374	return -EOPNOTSUPP;
375	if (!inode_owner_or_capable(inode))
376	return -EPERM;
377
378	if (value) {
379	acl = posix_acl_from_xattr(&init_user_ns, value, size);
380	if (IS_ERR(acl))
381	return PTR_ERR(acl);
382	if (acl) {
383	error = posix_acl_valid(acl);
384	if (error)
385	goto release_and_out;
386	}
387	} else {
388	acl = NULL;
389	}
390
391	error = f2fs_set_acl(inode, type, acl);
392
393	release_and_out:
394	posix_acl_release(acl);
395	return error;
396	}
397
398	const struct xattr_handler f2fs_xattr_acl_default_handler = {
399	.prefix = POSIX_ACL_XATTR_DEFAULT,
400	.flags = ACL_TYPE_DEFAULT,
401	.list = f2fs_xattr_list_acl,
402	.get = f2fs_xattr_get_acl,
403	.set = f2fs_xattr_set_acl,
404	};
405
406	const struct xattr_handler f2fs_xattr_acl_access_handler = {
407	.prefix = POSIX_ACL_XATTR_ACCESS,
408	.flags = ACL_TYPE_ACCESS,
409	.list = f2fs_xattr_list_acl,
410	.get = f2fs_xattr_get_acl,
411	.set = f2fs_xattr_set_acl,
412	};