[linux-2.6-block.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, <agruen@suse.de>
 *
 * 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:
			acl->a_entries[i].e_id = ACL_UNDEFINED_ID;
			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) {
		if (retval == -ENODATA)
			acl = NULL;
		else
			acl = ERR_PTR(retval);
	} else {
		acl = f2fs_acl_from_disk(value, 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);

	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;
	mode_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,
};

static size_t f2fs_xattr_advise_list(struct dentry *dentry, char *list,
		size_t list_size, const char *name, size_t name_len, int type)
{
	const char *xname = F2FS_SYSTEM_ADVISE_PREFIX;
	size_t size;

	if (type != F2FS_XATTR_INDEX_ADVISE)
		return 0;

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

static int f2fs_xattr_advise_get(struct dentry *dentry, const char *name,
		void *buffer, size_t size, int type)
{
	struct inode *inode = dentry->d_inode;

	if (strcmp(name, "") != 0)
		return -EINVAL;

	*((char *)buffer) = F2FS_I(inode)->i_advise;
	return sizeof(char);
}

static int f2fs_xattr_advise_set(struct dentry *dentry, const char *name,
		const void *value, size_t size, int flags, int type)
{
	struct inode *inode = dentry->d_inode;

	if (strcmp(name, "") != 0)
		return -EINVAL;
	if (!inode_owner_or_capable(inode))
		return -EPERM;
	if (value == NULL)
		return -EINVAL;

	F2FS_I(inode)->i_advise |= *(char *)value;
	return 0;
}

const struct xattr_handler f2fs_xattr_advise_handler = {
	.prefix = F2FS_SYSTEM_ADVISE_PREFIX,
	.flags	= F2FS_XATTR_INDEX_ADVISE,
	.list   = f2fs_xattr_advise_list,
	.get    = f2fs_xattr_advise_get,
	.set    = f2fs_xattr_advise_set,
};
Commit	Line	Data
af48b85b JK	1	/**
	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, <agruen@suse.de>
	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:
85	acl->a_entries[i].e_id = ACL_UNDEFINED_ID;
86	entry = (struct f2fs_acl_entry )((char )entry +
87	sizeof(struct f2fs_acl_entry_short));
88	break;
89
90	case ACL_USER:
91	acl->a_entries[i].e_uid =
92	make_kuid(&init_user_ns,
93	le32_to_cpu(entry->e_id));
94	entry = (struct f2fs_acl_entry )((char )entry +
95	sizeof(struct f2fs_acl_entry));
96	break;
97	case ACL_GROUP:
98	acl->a_entries[i].e_gid =
99	make_kgid(&init_user_ns,
100	le32_to_cpu(entry->e_id));
101	entry = (struct f2fs_acl_entry )((char )entry +
102	sizeof(struct f2fs_acl_entry));
103	break;
104	default:
105	goto fail;
106	}
107	}
108	if ((char *)entry != end)
109	goto fail;
110	return acl;
111	fail:
112	posix_acl_release(acl);
113	return ERR_PTR(-EINVAL);
114	}
115
116	static void f2fs_acl_to_disk(const struct posix_acl acl, size_t *size)
117	{
118	struct f2fs_acl_header *f2fs_acl;
119	struct f2fs_acl_entry *entry;
120	int i;
121
122	f2fs_acl = kmalloc(sizeof(struct f2fs_acl_header) + acl->a_count *
123	sizeof(struct f2fs_acl_entry), GFP_KERNEL);
124	if (!f2fs_acl)
125	return ERR_PTR(-ENOMEM);
126
127	f2fs_acl->a_version = cpu_to_le32(F2FS_ACL_VERSION);
128	entry = (struct f2fs_acl_entry *)(f2fs_acl + 1);
129
130	for (i = 0; i < acl->a_count; i++) {
131
132	entry->e_tag = cpu_to_le16(acl->a_entries[i].e_tag);
133	entry->e_perm = cpu_to_le16(acl->a_entries[i].e_perm);
134
135	switch (acl->a_entries[i].e_tag) {
136	case ACL_USER:
137	entry->e_id = cpu_to_le32(
138	from_kuid(&init_user_ns,
139	acl->a_entries[i].e_uid));
140	entry = (struct f2fs_acl_entry )((char )entry +
141	sizeof(struct f2fs_acl_entry));
142	break;
143	case ACL_GROUP:
144	entry->e_id = cpu_to_le32(
145	from_kgid(&init_user_ns,
146	acl->a_entries[i].e_gid));
147	entry = (struct f2fs_acl_entry )((char )entry +
148	sizeof(struct f2fs_acl_entry));
149	break;
150	case ACL_USER_OBJ:
151	case ACL_GROUP_OBJ:
152	case ACL_MASK:
153	case ACL_OTHER:
154	entry = (struct f2fs_acl_entry )((char )entry +
155	sizeof(struct f2fs_acl_entry_short));
156	break;
157	default:
158	goto fail;
159	}
160	}
161	*size = f2fs_acl_size(acl->a_count);
162	return (void *)f2fs_acl;
163
164	fail:
165	kfree(f2fs_acl);
166	return ERR_PTR(-EINVAL);
167	}
168
169	struct posix_acl f2fs_get_acl(struct inode inode, int type)
170	{
171	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
172	int name_index = F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT;
173	void *value = NULL;
174	struct posix_acl *acl;
175	int retval;
176
177	if (!test_opt(sbi, POSIX_ACL))
178	return NULL;
179
180	acl = get_cached_acl(inode, type);
181	if (acl != ACL_NOT_CACHED)
182	return acl;
183
184	if (type == ACL_TYPE_ACCESS)
185	name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS;
186
187	retval = f2fs_getxattr(inode, name_index, "", NULL, 0);
188	if (retval > 0) {
189	value = kmalloc(retval, GFP_KERNEL);
190	if (!value)
191	return ERR_PTR(-ENOMEM);
192	retval = f2fs_getxattr(inode, name_index, "", value, retval);
193	}
194
195	if (retval < 0) {
196	if (retval == -ENODATA)
197	acl = NULL;
198	else
199	acl = ERR_PTR(retval);
200	} else {
201	acl = f2fs_acl_from_disk(value, retval);
202	}
203	kfree(value);
204	if (!IS_ERR(acl))
205	set_cached_acl(inode, type, acl);
206
207	return acl;
208	}
209
210	static int f2fs_set_acl(struct inode inode, int type, struct posix_acl acl)
211	{
212	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
213	struct f2fs_inode_info *fi = F2FS_I(inode);
214	int name_index;
215	void *value = NULL;
216	size_t size = 0;
217	int error;
218
219	if (!test_opt(sbi, POSIX_ACL))
220	return 0;
221	if (S_ISLNK(inode->i_mode))
222	return -EOPNOTSUPP;
223
224	switch (type) {
225	case ACL_TYPE_ACCESS:
226	name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS;
227	if (acl) {
228	error = posix_acl_equiv_mode(acl, &inode->i_mode);
229	if (error < 0)
230	return error;
231	set_acl_inode(fi, inode->i_mode);
232	if (error == 0)
233	acl = NULL;
234	}
235	break;
236
237	case ACL_TYPE_DEFAULT:
238	name_index = F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT;
239	if (!S_ISDIR(inode->i_mode))
240	return acl ? -EACCES : 0;
241	break;
242
243	default:
244	return -EINVAL;
245	}
246
247	if (acl) {
248	value = f2fs_acl_to_disk(acl, &size);
249	if (IS_ERR(value)) {
250	cond_clear_inode_flag(fi, FI_ACL_MODE);
251	return (int)PTR_ERR(value);
252	}
253	}
254
255	error = f2fs_setxattr(inode, name_index, "", value, size);
256
257	kfree(value);
258	if (!error)
259	set_cached_acl(inode, type, acl);
260
261	cond_clear_inode_flag(fi, FI_ACL_MODE);
262	return error;
263	}
264
265	int f2fs_init_acl(struct inode inode, struct inode dir)
266	{
267	struct posix_acl *acl = NULL;
268	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
269	int error = 0;
270
271	if (!S_ISLNK(inode->i_mode)) {
272	if (test_opt(sbi, POSIX_ACL)) {
273	acl = f2fs_get_acl(dir, ACL_TYPE_DEFAULT);
274	if (IS_ERR(acl))
275	return PTR_ERR(acl);
276	}
277	if (!acl)
278	inode->i_mode &= ~current_umask();
279	}
280
281	if (test_opt(sbi, POSIX_ACL) && acl) {
282
283	if (S_ISDIR(inode->i_mode)) {
284	error = f2fs_set_acl(inode, ACL_TYPE_DEFAULT, acl);
285	if (error)
286	goto cleanup;
287	}
288	error = posix_acl_create(&acl, GFP_KERNEL, &inode->i_mode);
289	if (error < 0)
290	return error;
291	if (error > 0)
292	error = f2fs_set_acl(inode, ACL_TYPE_ACCESS, acl);
293	}
294	cleanup:
295	posix_acl_release(acl);
296	return error;
297	}
298
299	int f2fs_acl_chmod(struct inode *inode)
300	{
301	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
302	struct posix_acl *acl;
303	int error;
304	mode_t mode = get_inode_mode(inode);
305
306	if (!test_opt(sbi, POSIX_ACL))
307	return 0;
308	if (S_ISLNK(mode))
309	return -EOPNOTSUPP;
310
311	acl = f2fs_get_acl(inode, ACL_TYPE_ACCESS);
312	if (IS_ERR(acl) \|\| !acl)
313	return PTR_ERR(acl);
314
315	error = posix_acl_chmod(&acl, GFP_KERNEL, mode);
316	if (error)
317	return error;
318	error = f2fs_set_acl(inode, ACL_TYPE_ACCESS, acl);
319	posix_acl_release(acl);
320	return error;
321	}
322
323	static size_t f2fs_xattr_list_acl(struct dentry dentry, char list,
324	size_t list_size, const char *name, size_t name_len, int type)
325	{
326	struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
327	const char *xname = POSIX_ACL_XATTR_DEFAULT;
328	size_t size;
329
330	if (!test_opt(sbi, POSIX_ACL))
331	return 0;
332
333	if (type == ACL_TYPE_ACCESS)
334	xname = POSIX_ACL_XATTR_ACCESS;
335
336	size = strlen(xname) + 1;
337	if (list && size <= list_size)
338	memcpy(list, xname, size);
339	return size;
340	}
341
342	static int f2fs_xattr_get_acl(struct dentry dentry, const char name,
343	void *buffer, size_t size, int type)
344	{
345	struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
346	struct posix_acl *acl;
347	int error;
348
349	if (strcmp(name, "") != 0)
350	return -EINVAL;
351	if (!test_opt(sbi, POSIX_ACL))
352	return -EOPNOTSUPP;
353
354	acl = f2fs_get_acl(dentry->d_inode, type);
355	if (IS_ERR(acl))
356	return PTR_ERR(acl);
357	if (!acl)
358	return -ENODATA;
359	error = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
360	posix_acl_release(acl);
361
362	return error;
363	}
364
365	static int f2fs_xattr_set_acl(struct dentry dentry, const char name,
366	const void *value, size_t size, int flags, int type)
367	{
368	struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
369	struct inode *inode = dentry->d_inode;
370	struct posix_acl *acl = NULL;
371	int error;
372
373	if (strcmp(name, "") != 0)
374	return -EINVAL;
375	if (!test_opt(sbi, POSIX_ACL))
376	return -EOPNOTSUPP;
377	if (!inode_owner_or_capable(inode))
378	return -EPERM;
379
380	if (value) {
381	acl = posix_acl_from_xattr(&init_user_ns, value, size);
382	if (IS_ERR(acl))
383	return PTR_ERR(acl);
384	if (acl) {
385	error = posix_acl_valid(acl);
386	if (error)
387	goto release_and_out;
388	}
389	} else {
390	acl = NULL;
391	}
392
393	error = f2fs_set_acl(inode, type, acl);
394
395	release_and_out:
396	posix_acl_release(acl);
397	return error;
398	}
399
400	const struct xattr_handler f2fs_xattr_acl_default_handler = {
401	.prefix = POSIX_ACL_XATTR_DEFAULT,
402	.flags = ACL_TYPE_DEFAULT,
403	.list = f2fs_xattr_list_acl,
404	.get = f2fs_xattr_get_acl,
405	.set = f2fs_xattr_set_acl,
406	};
407
408	const struct xattr_handler f2fs_xattr_acl_access_handler = {
409	.prefix = POSIX_ACL_XATTR_ACCESS,
410	.flags = ACL_TYPE_ACCESS,
411	.list = f2fs_xattr_list_acl,
412	.get = f2fs_xattr_get_acl,
413	.set = f2fs_xattr_set_acl,
414	};
415
416	static size_t f2fs_xattr_advise_list(struct dentry dentry, char list,
417	size_t list_size, const char *name, size_t name_len, int type)
418	{
419	const char *xname = F2FS_SYSTEM_ADVISE_PREFIX;
420	size_t size;
421
422	if (type != F2FS_XATTR_INDEX_ADVISE)
423	return 0;
424
425	size = strlen(xname) + 1;
426	if (list && size <= list_size)
427	memcpy(list, xname, size);
428	return size;
429	}
430
431	static int f2fs_xattr_advise_get(struct dentry dentry, const char name,
432	void *buffer, size_t size, int type)
433	{
434	struct inode *inode = dentry->d_inode;
435
436	if (strcmp(name, "") != 0)
437	return -EINVAL;
438
439	((char )buffer) = F2FS_I(inode)->i_advise;
440	return sizeof(char);
441	}
442
443	static int f2fs_xattr_advise_set(struct dentry dentry, const char name,
444	const void *value, size_t size, int flags, int type)
445	{
446	struct inode *inode = dentry->d_inode;
447
448	if (strcmp(name, "") != 0)
449	return -EINVAL;
450	if (!inode_owner_or_capable(inode))
451	return -EPERM;
452	if (value == NULL)
453	return -EINVAL;
454
455	F2FS_I(inode)->i_advise \|= (char )value;
456	return 0;
457	}
458
459	const struct xattr_handler f2fs_xattr_advise_handler = {
460	.prefix = F2FS_SYSTEM_ADVISE_PREFIX,
461	.flags = F2FS_XATTR_INDEX_ADVISE,
462	.list = f2fs_xattr_advise_list,
463	.get = f2fs_xattr_advise_get,
464	.set = f2fs_xattr_advise_set,
465	};