[mirror_ubuntu-zesty-kernel.git] / fs / jffs2 / acl.c

/*
 * JFFS2 -- Journalling Flash File System, Version 2.
 *
 * Copyright © 2006  NEC Corporation
 *
 * Created by KaiGai Kohei <kaigai@ak.jp.nec.com>
 *
 * For licensing information, see the file 'LICENCE' in this directory.
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/sched.h>
#include <linux/time.h>
#include <linux/crc32.h>
#include <linux/jffs2.h>
#include <linux/xattr.h>
#include <linux/posix_acl_xattr.h>
#include <linux/mtd/mtd.h>
#include "nodelist.h"

static size_t jffs2_acl_size(int count)
{
	if (count <= 4) {
		return sizeof(struct jffs2_acl_header)
		       + count * sizeof(struct jffs2_acl_entry_short);
	} else {
		return sizeof(struct jffs2_acl_header)
		       + 4 * sizeof(struct jffs2_acl_entry_short)
		       + (count - 4) * sizeof(struct jffs2_acl_entry);
	}
}

static int jffs2_acl_count(size_t size)
{
	size_t s;

	size -= sizeof(struct jffs2_acl_header);
	if (size < 4 * sizeof(struct jffs2_acl_entry_short)) {
		if (size % sizeof(struct jffs2_acl_entry_short))
			return -1;
		return size / sizeof(struct jffs2_acl_entry_short);
	} else {
		s = size - 4 * sizeof(struct jffs2_acl_entry_short);
		if (s % sizeof(struct jffs2_acl_entry))
			return -1;
		return s / sizeof(struct jffs2_acl_entry) + 4;
	}
}

static struct posix_acl *jffs2_acl_from_medium(void *value, size_t size)
{
	void *end = value + size;
	struct jffs2_acl_header *header = value;
	struct jffs2_acl_entry *entry;
	struct posix_acl *acl;
	uint32_t ver;
	int i, count;

	if (!value)
		return NULL;
	if (size < sizeof(struct jffs2_acl_header))
		return ERR_PTR(-EINVAL);
	ver = je32_to_cpu(header->a_version);
	if (ver != JFFS2_ACL_VERSION) {
		JFFS2_WARNING("Invalid ACL version. (=%u)\n", ver);
		return ERR_PTR(-EINVAL);
	}

	value += sizeof(struct jffs2_acl_header);
	count = jffs2_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++) {
		entry = value;
		if (value + sizeof(struct jffs2_acl_entry_short) > end)
			goto fail;
		acl->a_entries[i].e_tag = je16_to_cpu(entry->e_tag);
		acl->a_entries[i].e_perm = je16_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:
				value += sizeof(struct jffs2_acl_entry_short);
				acl->a_entries[i].e_id = ACL_UNDEFINED_ID;
				break;

			case ACL_USER:
			case ACL_GROUP:
				value += sizeof(struct jffs2_acl_entry);
				if (value > end)
					goto fail;
				acl->a_entries[i].e_id = je32_to_cpu(entry->e_id);
				break;

			default:
				goto fail;
		}
	}
	if (value != end)
		goto fail;
	return acl;
 fail:
	posix_acl_release(acl);
	return ERR_PTR(-EINVAL);
}

static void *jffs2_acl_to_medium(const struct posix_acl *acl, size_t *size)
{
	struct jffs2_acl_header *header;
	struct jffs2_acl_entry *entry;
	void *e;
	size_t i;

	*size = jffs2_acl_size(acl->a_count);
	header = kmalloc(sizeof(*header) + acl->a_count * sizeof(*entry), GFP_KERNEL);
	if (!header)
		return ERR_PTR(-ENOMEM);
	header->a_version = cpu_to_je32(JFFS2_ACL_VERSION);
	e = header + 1;
	for (i=0; i < acl->a_count; i++) {
		entry = e;
		entry->e_tag = cpu_to_je16(acl->a_entries[i].e_tag);
		entry->e_perm = cpu_to_je16(acl->a_entries[i].e_perm);
		switch(acl->a_entries[i].e_tag) {
			case ACL_USER:
			case ACL_GROUP:
				entry->e_id = cpu_to_je32(acl->a_entries[i].e_id);
				e += sizeof(struct jffs2_acl_entry);
				break;

			case ACL_USER_OBJ:
			case ACL_GROUP_OBJ:
			case ACL_MASK:
			case ACL_OTHER:
				e += sizeof(struct jffs2_acl_entry_short);
				break;

			default:
				goto fail;
		}
	}
	return header;
 fail:
	kfree(header);
	return ERR_PTR(-EINVAL);
}

struct posix_acl *jffs2_get_acl(struct inode *inode, int type)
{
	struct posix_acl *acl;
	char *value = NULL;
	int rc, xprefix;

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

	switch (type) {
	case ACL_TYPE_ACCESS:
		xprefix = JFFS2_XPREFIX_ACL_ACCESS;
		break;
	case ACL_TYPE_DEFAULT:
		xprefix = JFFS2_XPREFIX_ACL_DEFAULT;
		break;
	default:
		BUG();
	}
	rc = do_jffs2_getxattr(inode, xprefix, "", NULL, 0);
	if (rc > 0) {
		value = kmalloc(rc, GFP_KERNEL);
		if (!value)
			return ERR_PTR(-ENOMEM);
		rc = do_jffs2_getxattr(inode, xprefix, "", value, rc);
	}
	if (rc > 0) {
		acl = jffs2_acl_from_medium(value, rc);
	} else if (rc == -ENODATA || rc == -ENOSYS) {
		acl = NULL;
	} else {
		acl = ERR_PTR(rc);
	}
	if (value)
		kfree(value);
	if (!IS_ERR(acl))
		set_cached_acl(inode, type, acl);
	return acl;
}

static int __jffs2_set_acl(struct inode *inode, int xprefix, struct posix_acl *acl)
{
	char *value = NULL;
	size_t size = 0;
	int rc;

	if (acl) {
		value = jffs2_acl_to_medium(acl, &size);
		if (IS_ERR(value))
			return PTR_ERR(value);
	}
	rc = do_jffs2_setxattr(inode, xprefix, "", value, size, 0);
	if (!value && rc == -ENODATA)
		rc = 0;
	kfree(value);

	return rc;
}

static int jffs2_set_acl(struct inode *inode, int type, struct posix_acl *acl)
{
	int rc, xprefix;

	if (S_ISLNK(inode->i_mode))
		return -EOPNOTSUPP;

	switch (type) {
	case ACL_TYPE_ACCESS:
		xprefix = JFFS2_XPREFIX_ACL_ACCESS;
		if (acl) {
			umode_t mode = inode->i_mode;
			rc = posix_acl_equiv_mode(acl, &mode);
			if (rc < 0)
				return rc;
			if (inode->i_mode != mode) {
				struct iattr attr;

				attr.ia_valid = ATTR_MODE | ATTR_CTIME;
				attr.ia_mode = mode;
				attr.ia_ctime = CURRENT_TIME_SEC;
				rc = jffs2_do_setattr(inode, &attr);
				if (rc < 0)
					return rc;
			}
			if (rc == 0)
				acl = NULL;
		}
		break;
	case ACL_TYPE_DEFAULT:
		xprefix = JFFS2_XPREFIX_ACL_DEFAULT;
		if (!S_ISDIR(inode->i_mode))
			return acl ? -EACCES : 0;
		break;
	default:
		return -EINVAL;
	}
	rc = __jffs2_set_acl(inode, xprefix, acl);
	if (!rc)
		set_cached_acl(inode, type, acl);
	return rc;
}

int jffs2_init_acl_pre(struct inode *dir_i, struct inode *inode, umode_t *i_mode)
{
	struct posix_acl *acl;
	int rc;

	cache_no_acl(inode);

	if (S_ISLNK(*i_mode))
		return 0;	/* Symlink always has no-ACL */

	acl = jffs2_get_acl(dir_i, ACL_TYPE_DEFAULT);
	if (IS_ERR(acl))
		return PTR_ERR(acl);

	if (!acl) {
		*i_mode &= ~current_umask();
	} else {
		if (S_ISDIR(*i_mode))
			set_cached_acl(inode, ACL_TYPE_DEFAULT, acl);

		rc = posix_acl_create(&acl, GFP_KERNEL, i_mode);
		if (rc < 0)
			return rc;
		if (rc > 0)
			set_cached_acl(inode, ACL_TYPE_ACCESS, acl);

		posix_acl_release(acl);
	}
	return 0;
}

int jffs2_init_acl_post(struct inode *inode)
{
	int rc;

	if (inode->i_default_acl) {
		rc = __jffs2_set_acl(inode, JFFS2_XPREFIX_ACL_DEFAULT, inode->i_default_acl);
		if (rc)
			return rc;
	}

	if (inode->i_acl) {
		rc = __jffs2_set_acl(inode, JFFS2_XPREFIX_ACL_ACCESS, inode->i_acl);
		if (rc)
			return rc;
	}

	return 0;
}

int jffs2_acl_chmod(struct inode *inode)
{
	struct posix_acl *acl;
	int rc;

	if (S_ISLNK(inode->i_mode))
		return -EOPNOTSUPP;
	acl = jffs2_get_acl(inode, ACL_TYPE_ACCESS);
	if (IS_ERR(acl) || !acl)
		return PTR_ERR(acl);
	rc = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
	if (rc)
		return rc;
	rc = jffs2_set_acl(inode, ACL_TYPE_ACCESS, acl);
	posix_acl_release(acl);
	return rc;
}

static size_t jffs2_acl_access_listxattr(struct dentry *dentry, char *list,
		size_t list_size, const char *name, size_t name_len, int type)
{
	const int retlen = sizeof(POSIX_ACL_XATTR_ACCESS);

	if (list && retlen <= list_size)
		strcpy(list, POSIX_ACL_XATTR_ACCESS);
	return retlen;
}

static size_t jffs2_acl_default_listxattr(struct dentry *dentry, char *list,
		size_t list_size, const char *name, size_t name_len, int type)
{
	const int retlen = sizeof(POSIX_ACL_XATTR_DEFAULT);

	if (list && retlen <= list_size)
		strcpy(list, POSIX_ACL_XATTR_DEFAULT);
	return retlen;
}

static int jffs2_acl_getxattr(struct dentry *dentry, const char *name,
		void *buffer, size_t size, int type)
{
	struct posix_acl *acl;
	int rc;

	if (name[0] != '\0')
		return -EINVAL;

	acl = jffs2_get_acl(dentry->d_inode, type);
	if (IS_ERR(acl))
		return PTR_ERR(acl);
	if (!acl)
		return -ENODATA;
	rc = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
	posix_acl_release(acl);

	return rc;
}

static int jffs2_acl_setxattr(struct dentry *dentry, const char *name,
		const void *value, size_t size, int flags, int type)
{
	struct posix_acl *acl;
	int rc;

	if (name[0] != '\0')
		return -EINVAL;
	if (!inode_owner_or_capable(dentry->d_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) {
			rc = posix_acl_valid(acl);
			if (rc)
				goto out;
		}
	} else {
		acl = NULL;
	}
	rc = jffs2_set_acl(dentry->d_inode, type, acl);
 out:
	posix_acl_release(acl);
	return rc;
}

const struct xattr_handler jffs2_acl_access_xattr_handler = {
	.prefix	= POSIX_ACL_XATTR_ACCESS,
	.flags	= ACL_TYPE_DEFAULT,
	.list	= jffs2_acl_access_listxattr,
	.get	= jffs2_acl_getxattr,
	.set	= jffs2_acl_setxattr,
};

const struct xattr_handler jffs2_acl_default_xattr_handler = {
	.prefix	= POSIX_ACL_XATTR_DEFAULT,
	.flags	= ACL_TYPE_DEFAULT,
	.list	= jffs2_acl_default_listxattr,
	.get	= jffs2_acl_getxattr,
	.set	= jffs2_acl_setxattr,
};
Commit	Line	Data
652ecc20 KK	1	/*
652ecc20 KK	2	* JFFS2 -- Journalling Flash File System, Version 2.
aa98d7cf	3	*
c00c310e	4	* Copyright © 2006 NEC Corporation
aa98d7cf	5	*
652ecc20 KK	6	* Created by KaiGai Kohei <kaigai@ak.jp.nec.com>
	7	*
	8	* For licensing information, see the file 'LICENCE' in this directory.
	9	*
	10	*/
c00c310e	11
5a528957 JP	12	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
5a528957 JP	13
aa98d7cf KK	14	#include <linux/kernel.h>
	15	#include <linux/slab.h>
	16	#include <linux/fs.h>
914e2637	17	#include <linux/sched.h>
aa98d7cf KK	18	#include <linux/time.h>
	19	#include <linux/crc32.h>
	20	#include <linux/jffs2.h>
	21	#include <linux/xattr.h>
	22	#include <linux/posix_acl_xattr.h>
	23	#include <linux/mtd/mtd.h>
	24	#include "nodelist.h"
	25
	26	static size_t jffs2_acl_size(int count)
	27	{
	28	if (count <= 4) {
de1f72fa KK	29	return sizeof(struct jffs2_acl_header)
de1f72fa KK	30	+ count * sizeof(struct jffs2_acl_entry_short);
aa98d7cf	31	} else {
de1f72fa KK	32	return sizeof(struct jffs2_acl_header)
	33	+ 4 * sizeof(struct jffs2_acl_entry_short)
	34	+ (count - 4) * sizeof(struct jffs2_acl_entry);
aa98d7cf KK	35	}
	36	}
	37
	38	static int jffs2_acl_count(size_t size)
	39	{
	40	size_t s;
	41
de1f72fa	42	size -= sizeof(struct jffs2_acl_header);
fc371a25	43	if (size < 4 * sizeof(struct jffs2_acl_entry_short)) {
de1f72fa	44	if (size % sizeof(struct jffs2_acl_entry_short))
aa98d7cf	45	return -1;
de1f72fa	46	return size / sizeof(struct jffs2_acl_entry_short);
aa98d7cf	47	} else {
fc371a25	48	s = size - 4 * sizeof(struct jffs2_acl_entry_short);
de1f72fa	49	if (s % sizeof(struct jffs2_acl_entry))
aa98d7cf	50	return -1;
de1f72fa	51	return s / sizeof(struct jffs2_acl_entry) + 4;
aa98d7cf KK	52	}
	53	}
	54
dea80134	55	static struct posix_acl jffs2_acl_from_medium(void value, size_t size)
aa98d7cf	56	{
dea80134 KK	57	void *end = value + size;
	58	struct jffs2_acl_header *header = value;
	59	struct jffs2_acl_entry *entry;
aa98d7cf KK	60	struct posix_acl *acl;
	61	uint32_t ver;
	62	int i, count;
	63
	64	if (!value)
	65	return NULL;
de1f72fa	66	if (size < sizeof(struct jffs2_acl_header))
aa98d7cf	67	return ERR_PTR(-EINVAL);
dea80134	68	ver = je32_to_cpu(header->a_version);
aa98d7cf KK	69	if (ver != JFFS2_ACL_VERSION) {
	70	JFFS2_WARNING("Invalid ACL version. (=%u)\n", ver);
	71	return ERR_PTR(-EINVAL);
	72	}
	73
dea80134	74	value += sizeof(struct jffs2_acl_header);
aa98d7cf KK	75	count = jffs2_acl_count(size);
	76	if (count < 0)
	77	return ERR_PTR(-EINVAL);
	78	if (count == 0)
	79	return NULL;
	80
	81	acl = posix_acl_alloc(count, GFP_KERNEL);
	82	if (!acl)
	83	return ERR_PTR(-ENOMEM);
	84
	85	for (i=0; i < count; i++) {
dea80134 KK	86	entry = value;
dea80134 KK	87	if (value + sizeof(struct jffs2_acl_entry_short) > end)
aa98d7cf KK	88	goto fail;
	89	acl->a_entries[i].e_tag = je16_to_cpu(entry->e_tag);
	90	acl->a_entries[i].e_perm = je16_to_cpu(entry->e_perm);
	91	switch (acl->a_entries[i].e_tag) {
	92	case ACL_USER_OBJ:
	93	case ACL_GROUP_OBJ:
	94	case ACL_MASK:
	95	case ACL_OTHER:
dea80134	96	value += sizeof(struct jffs2_acl_entry_short);
aa98d7cf KK	97	acl->a_entries[i].e_id = ACL_UNDEFINED_ID;
	98	break;
	99
	100	case ACL_USER:
	101	case ACL_GROUP:
dea80134 KK	102	value += sizeof(struct jffs2_acl_entry);
dea80134 KK	103	if (value > end)
aa98d7cf KK	104	goto fail;
	105	acl->a_entries[i].e_id = je32_to_cpu(entry->e_id);
	106	break;
	107
	108	default:
	109	goto fail;
	110	}
	111	}
	112	if (value != end)
	113	goto fail;
	114	return acl;
	115	fail:
	116	posix_acl_release(acl);
	117	return ERR_PTR(-EINVAL);
	118	}
	119
	120	static void jffs2_acl_to_medium(const struct posix_acl acl, size_t *size)
	121	{
dea80134 KK	122	struct jffs2_acl_header *header;
	123	struct jffs2_acl_entry *entry;
	124	void *e;
aa98d7cf KK	125	size_t i;
	126
	127	*size = jffs2_acl_size(acl->a_count);
dea80134 KK	128	header = kmalloc(sizeof(header) + acl->a_count sizeof(*entry), GFP_KERNEL);
dea80134 KK	129	if (!header)
aa98d7cf	130	return ERR_PTR(-ENOMEM);
dea80134 KK	131	header->a_version = cpu_to_je32(JFFS2_ACL_VERSION);
dea80134 KK	132	e = header + 1;
aa98d7cf	133	for (i=0; i < acl->a_count; i++) {
dea80134	134	entry = e;
aa98d7cf KK	135	entry->e_tag = cpu_to_je16(acl->a_entries[i].e_tag);
	136	entry->e_perm = cpu_to_je16(acl->a_entries[i].e_perm);
	137	switch(acl->a_entries[i].e_tag) {
	138	case ACL_USER:
	139	case ACL_GROUP:
	140	entry->e_id = cpu_to_je32(acl->a_entries[i].e_id);
de1f72fa	141	e += sizeof(struct jffs2_acl_entry);
aa98d7cf KK	142	break;
	143
	144	case ACL_USER_OBJ:
	145	case ACL_GROUP_OBJ:
	146	case ACL_MASK:
	147	case ACL_OTHER:
de1f72fa	148	e += sizeof(struct jffs2_acl_entry_short);
aa98d7cf KK	149	break;
	150
	151	default:
	152	goto fail;
	153	}
	154	}
dea80134	155	return header;
aa98d7cf	156	fail:
dea80134	157	kfree(header);
aa98d7cf KK	158	return ERR_PTR(-EINVAL);
	159	}
	160
4e34e719	161	struct posix_acl jffs2_get_acl(struct inode inode, int type)
aa98d7cf	162	{
aa98d7cf KK	163	struct posix_acl *acl;
	164	char *value = NULL;
	165	int rc, xprefix;
	166
073aaa1b AV	167	acl = get_cached_acl(inode, type);
	168	if (acl != ACL_NOT_CACHED)
	169	return acl;
	170
aa98d7cf KK	171	switch (type) {
aa98d7cf KK	172	case ACL_TYPE_ACCESS:
aa98d7cf KK	173	xprefix = JFFS2_XPREFIX_ACL_ACCESS;
	174	break;
	175	case ACL_TYPE_DEFAULT:
aa98d7cf KK	176	xprefix = JFFS2_XPREFIX_ACL_DEFAULT;
	177	break;
	178	default:
073aaa1b	179	BUG();
aa98d7cf KK	180	}
	181	rc = do_jffs2_getxattr(inode, xprefix, "", NULL, 0);
	182	if (rc > 0) {
	183	value = kmalloc(rc, GFP_KERNEL);
	184	if (!value)
	185	return ERR_PTR(-ENOMEM);
	186	rc = do_jffs2_getxattr(inode, xprefix, "", value, rc);
	187	}
	188	if (rc > 0) {
	189	acl = jffs2_acl_from_medium(value, rc);
	190	} else if (rc == -ENODATA \|\| rc == -ENOSYS) {
	191	acl = NULL;
	192	} else {
	193	acl = ERR_PTR(rc);
	194	}
	195	if (value)
	196	kfree(value);
073aaa1b AV	197	if (!IS_ERR(acl))
073aaa1b AV	198	set_cached_acl(inode, type, acl);
aa98d7cf KK	199	return acl;
	200	}
	201
cfc8dc6f KK	202	static int __jffs2_set_acl(struct inode inode, int xprefix, struct posix_acl acl)
	203	{
	204	char *value = NULL;
	205	size_t size = 0;
	206	int rc;
	207
	208	if (acl) {
	209	value = jffs2_acl_to_medium(acl, &size);
	210	if (IS_ERR(value))
	211	return PTR_ERR(value);
	212	}
	213	rc = do_jffs2_setxattr(inode, xprefix, "", value, size, 0);
	214	if (!value && rc == -ENODATA)
	215	rc = 0;
	216	kfree(value);
	217
	218	return rc;
	219	}
	220
aa98d7cf KK	221	static int jffs2_set_acl(struct inode inode, int type, struct posix_acl acl)
aa98d7cf KK	222	{
aa98d7cf KK	223	int rc, xprefix;
	224
	225	if (S_ISLNK(inode->i_mode))
	226	return -EOPNOTSUPP;
	227
	228	switch (type) {
	229	case ACL_TYPE_ACCESS:
	230	xprefix = JFFS2_XPREFIX_ACL_ACCESS;
	231	if (acl) {
d6952123	232	umode_t mode = inode->i_mode;
aa98d7cf KK	233	rc = posix_acl_equiv_mode(acl, &mode);
	234	if (rc < 0)
	235	return rc;
	236	if (inode->i_mode != mode) {
9ed437c5 DW	237	struct iattr attr;
9ed437c5 DW	238
1c24d06f	239	attr.ia_valid = ATTR_MODE \| ATTR_CTIME;
9ed437c5	240	attr.ia_mode = mode;
1c24d06f	241	attr.ia_ctime = CURRENT_TIME_SEC;
9ed437c5 DW	242	rc = jffs2_do_setattr(inode, &attr);
	243	if (rc < 0)
	244	return rc;
aa98d7cf KK	245	}
	246	if (rc == 0)
	247	acl = NULL;
	248	}
	249	break;
	250	case ACL_TYPE_DEFAULT:
	251	xprefix = JFFS2_XPREFIX_ACL_DEFAULT;
	252	if (!S_ISDIR(inode->i_mode))
	253	return acl ? -EACCES : 0;
	254	break;
	255	default:
	256	return -EINVAL;
	257	}
cfc8dc6f	258	rc = __jffs2_set_acl(inode, xprefix, acl);
073aaa1b AV	259	if (!rc)
073aaa1b AV	260	set_cached_acl(inode, type, acl);
aa98d7cf KK	261	return rc;
	262	}
	263
d3fb6120	264	int jffs2_init_acl_pre(struct inode dir_i, struct inode inode, umode_t *i_mode)
aa98d7cf	265	{
826cae2f	266	struct posix_acl *acl;
cfc8dc6f	267	int rc;
aa98d7cf	268
72c04902	269	cache_no_acl(inode);
cfc8dc6f KK	270
	271	if (S_ISLNK(*i_mode))
	272	return 0; /* Symlink always has no-ACL */
	273
	274	acl = jffs2_get_acl(dir_i, ACL_TYPE_DEFAULT);
	275	if (IS_ERR(acl))
	276	return PTR_ERR(acl);
	277
	278	if (!acl) {
ce3b0f8d	279	*i_mode &= ~current_umask();
cfc8dc6f KK	280	} else {
cfc8dc6f KK	281	if (S_ISDIR(*i_mode))
073aaa1b	282	set_cached_acl(inode, ACL_TYPE_DEFAULT, acl);
9ed437c5	283
826cae2f AV	284	rc = posix_acl_create(&acl, GFP_KERNEL, i_mode);
826cae2f AV	285	if (rc < 0)
cfc8dc6f KK	286	return rc;
cfc8dc6f KK	287	if (rc > 0)
826cae2f	288	set_cached_acl(inode, ACL_TYPE_ACCESS, acl);
cfc8dc6f	289
826cae2f	290	posix_acl_release(acl);
aa98d7cf	291	}
cfc8dc6f KK	292	return 0;
	293	}
	294
	295	int jffs2_init_acl_post(struct inode *inode)
	296	{
cfc8dc6f KK	297	int rc;
cfc8dc6f KK	298
290c263b AV	299	if (inode->i_default_acl) {
290c263b AV	300	rc = __jffs2_set_acl(inode, JFFS2_XPREFIX_ACL_DEFAULT, inode->i_default_acl);
cfc8dc6f KK	301	if (rc)
	302	return rc;
	303	}
	304
290c263b AV	305	if (inode->i_acl) {
290c263b AV	306	rc = __jffs2_set_acl(inode, JFFS2_XPREFIX_ACL_ACCESS, inode->i_acl);
cfc8dc6f KK	307	if (rc)
	308	return rc;
	309	}
	310
8d6ea587	311	return 0;
aa98d7cf KK	312	}
aa98d7cf KK	313
aa98d7cf KK	314	int jffs2_acl_chmod(struct inode *inode)
aa98d7cf KK	315	{
bc26ab5f	316	struct posix_acl *acl;
aa98d7cf KK	317	int rc;
	318
	319	if (S_ISLNK(inode->i_mode))
	320	return -EOPNOTSUPP;
	321	acl = jffs2_get_acl(inode, ACL_TYPE_ACCESS);
	322	if (IS_ERR(acl) \|\| !acl)
	323	return PTR_ERR(acl);
bc26ab5f AV	324	rc = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
	325	if (rc)
	326	return rc;
	327	rc = jffs2_set_acl(inode, ACL_TYPE_ACCESS, acl);
aa98d7cf	328	posix_acl_release(acl);
aa98d7cf KK	329	return rc;
	330	}
	331
431547b3 CH	332	static size_t jffs2_acl_access_listxattr(struct dentry dentry, char list,
431547b3 CH	333	size_t list_size, const char *name, size_t name_len, int type)
aa98d7cf KK	334	{
	335	const int retlen = sizeof(POSIX_ACL_XATTR_ACCESS);
	336
	337	if (list && retlen <= list_size)
	338	strcpy(list, POSIX_ACL_XATTR_ACCESS);
	339	return retlen;
	340	}
	341
431547b3 CH	342	static size_t jffs2_acl_default_listxattr(struct dentry dentry, char list,
431547b3 CH	343	size_t list_size, const char *name, size_t name_len, int type)
aa98d7cf KK	344	{
	345	const int retlen = sizeof(POSIX_ACL_XATTR_DEFAULT);
	346
	347	if (list && retlen <= list_size)
	348	strcpy(list, POSIX_ACL_XATTR_DEFAULT);
	349	return retlen;
	350	}
	351
431547b3 CH	352	static int jffs2_acl_getxattr(struct dentry dentry, const char name,
431547b3 CH	353	void *buffer, size_t size, int type)
aa98d7cf KK	354	{
	355	struct posix_acl *acl;
	356	int rc;
	357
431547b3 CH	358	if (name[0] != '\0')
	359	return -EINVAL;
	360
	361	acl = jffs2_get_acl(dentry->d_inode, type);
aa98d7cf KK	362	if (IS_ERR(acl))
	363	return PTR_ERR(acl);
	364	if (!acl)
	365	return -ENODATA;
5f3a4a28	366	rc = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
aa98d7cf KK	367	posix_acl_release(acl);
	368
	369	return rc;
	370	}
	371
431547b3 CH	372	static int jffs2_acl_setxattr(struct dentry dentry, const char name,
431547b3 CH	373	const void *value, size_t size, int flags, int type)
aa98d7cf KK	374	{
	375	struct posix_acl *acl;
	376	int rc;
	377
431547b3 CH	378	if (name[0] != '\0')
431547b3 CH	379	return -EINVAL;
2e149670	380	if (!inode_owner_or_capable(dentry->d_inode))
aa98d7cf KK	381	return -EPERM;
	382
	383	if (value) {
5f3a4a28	384	acl = posix_acl_from_xattr(&init_user_ns, value, size);
aa98d7cf KK	385	if (IS_ERR(acl))
	386	return PTR_ERR(acl);
	387	if (acl) {
	388	rc = posix_acl_valid(acl);
	389	if (rc)
	390	goto out;
	391	}
	392	} else {
	393	acl = NULL;
	394	}
431547b3	395	rc = jffs2_set_acl(dentry->d_inode, type, acl);
aa98d7cf KK	396	out:
	397	posix_acl_release(acl);
	398	return rc;
	399	}
	400
365f0cb9	401	const struct xattr_handler jffs2_acl_access_xattr_handler = {
aa98d7cf	402	.prefix = POSIX_ACL_XATTR_ACCESS,
431547b3	403	.flags = ACL_TYPE_DEFAULT,
aa98d7cf	404	.list = jffs2_acl_access_listxattr,
431547b3 CH	405	.get = jffs2_acl_getxattr,
431547b3 CH	406	.set = jffs2_acl_setxattr,
aa98d7cf KK	407	};
aa98d7cf KK	408
365f0cb9	409	const struct xattr_handler jffs2_acl_default_xattr_handler = {
aa98d7cf	410	.prefix = POSIX_ACL_XATTR_DEFAULT,
431547b3	411	.flags = ACL_TYPE_DEFAULT,
aa98d7cf	412	.list = jffs2_acl_default_listxattr,
431547b3 CH	413	.get = jffs2_acl_getxattr,
431547b3 CH	414	.set = jffs2_acl_setxattr,
aa98d7cf	415	};