[mirror_ubuntu-zesty-kernel.git] / fs / ext2 / acl.c

/*
 * linux/fs/ext2/acl.c
 *
 * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de>
 */

#include <linux/capability.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include "ext2.h"
#include "xattr.h"
#include "acl.h"

/*
 * Convert from filesystem to in-memory representation.
 */
static struct posix_acl *
ext2_acl_from_disk(const void *value, size_t size)
{
	const char *end = (char *)value + size;
	int n, count;
	struct posix_acl *acl;

	if (!value)
		return NULL;
	if (size < sizeof(ext2_acl_header))
		 return ERR_PTR(-EINVAL);
	if (((ext2_acl_header *)value)->a_version !=
	    cpu_to_le32(EXT2_ACL_VERSION))
		return ERR_PTR(-EINVAL);
	value = (char *)value + sizeof(ext2_acl_header);
	count = ext2_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 (n=0; n < count; n++) {
		ext2_acl_entry *entry =
			(ext2_acl_entry *)value;
		if ((char *)value + sizeof(ext2_acl_entry_short) > end)
			goto fail;
		acl->a_entries[n].e_tag  = le16_to_cpu(entry->e_tag);
		acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm);
		switch(acl->a_entries[n].e_tag) {
			case ACL_USER_OBJ:
			case ACL_GROUP_OBJ:
			case ACL_MASK:
			case ACL_OTHER:
				value = (char *)value +
					sizeof(ext2_acl_entry_short);
				break;

			case ACL_USER:
				value = (char *)value + sizeof(ext2_acl_entry);
				if ((char *)value > end)
					goto fail;
				acl->a_entries[n].e_uid =
					make_kuid(&init_user_ns,
						  le32_to_cpu(entry->e_id));
				break;
			case ACL_GROUP:
				value = (char *)value + sizeof(ext2_acl_entry);
				if ((char *)value > end)
					goto fail;
				acl->a_entries[n].e_gid =
					make_kgid(&init_user_ns,
						  le32_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);
}

/*
 * Convert from in-memory to filesystem representation.
 */
static void *
ext2_acl_to_disk(const struct posix_acl *acl, size_t *size)
{
	ext2_acl_header *ext_acl;
	char *e;
	size_t n;

	*size = ext2_acl_size(acl->a_count);
	ext_acl = kmalloc(sizeof(ext2_acl_header) + acl->a_count *
			sizeof(ext2_acl_entry), GFP_KERNEL);
	if (!ext_acl)
		return ERR_PTR(-ENOMEM);
	ext_acl->a_version = cpu_to_le32(EXT2_ACL_VERSION);
	e = (char *)ext_acl + sizeof(ext2_acl_header);
	for (n=0; n < acl->a_count; n++) {
		const struct posix_acl_entry *acl_e = &acl->a_entries[n];
		ext2_acl_entry *entry = (ext2_acl_entry *)e;
		entry->e_tag  = cpu_to_le16(acl_e->e_tag);
		entry->e_perm = cpu_to_le16(acl_e->e_perm);
		switch(acl_e->e_tag) {
			case ACL_USER:
				entry->e_id = cpu_to_le32(
					from_kuid(&init_user_ns, acl_e->e_uid));
				e += sizeof(ext2_acl_entry);
				break;
			case ACL_GROUP:
				entry->e_id = cpu_to_le32(
					from_kgid(&init_user_ns, acl_e->e_gid));
				e += sizeof(ext2_acl_entry);
				break;

			case ACL_USER_OBJ:
			case ACL_GROUP_OBJ:
			case ACL_MASK:
			case ACL_OTHER:
				e += sizeof(ext2_acl_entry_short);
				break;

			default:
				goto fail;
		}
	}
	return (char *)ext_acl;

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

/*
 * inode->i_mutex: don't care
 */
struct posix_acl *
ext2_get_acl(struct inode *inode, int type)
{
	int name_index;
	char *value = NULL;
	struct posix_acl *acl;
	int retval;

	if (!test_opt(inode->i_sb, POSIX_ACL))
		return NULL;

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

	switch (type) {
	case ACL_TYPE_ACCESS:
		name_index = EXT2_XATTR_INDEX_POSIX_ACL_ACCESS;
		break;
	case ACL_TYPE_DEFAULT:
		name_index = EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT;
		break;
	default:
		BUG();
	}
	retval = ext2_xattr_get(inode, name_index, "", NULL, 0);
	if (retval > 0) {
		value = kmalloc(retval, GFP_KERNEL);
		if (!value)
			return ERR_PTR(-ENOMEM);
		retval = ext2_xattr_get(inode, name_index, "", value, retval);
	}
	if (retval > 0)
		acl = ext2_acl_from_disk(value, retval);
	else if (retval == -ENODATA || retval == -ENOSYS)
		acl = NULL;
	else
		acl = ERR_PTR(retval);
	kfree(value);

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

	return acl;
}

/*
 * inode->i_mutex: down
 */
static int
ext2_set_acl(struct inode *inode, int type, struct posix_acl *acl)
{
	int name_index;
	void *value = NULL;
	size_t size = 0;
	int error;

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

	switch(type) {
		case ACL_TYPE_ACCESS:
			name_index = EXT2_XATTR_INDEX_POSIX_ACL_ACCESS;
			if (acl) {
				error = posix_acl_equiv_mode(acl, &inode->i_mode);
				if (error < 0)
					return error;
				else {
					inode->i_ctime = CURRENT_TIME_SEC;
					mark_inode_dirty(inode);
					if (error == 0)
						acl = NULL;
				}
			}
			break;

		case ACL_TYPE_DEFAULT:
			name_index = EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT;
			if (!S_ISDIR(inode->i_mode))
				return acl ? -EACCES : 0;
			break;

		default:
			return -EINVAL;
	}
 	if (acl) {
		value = ext2_acl_to_disk(acl, &size);
		if (IS_ERR(value))
			return (int)PTR_ERR(value);
	}

	error = ext2_xattr_set(inode, name_index, "", value, size, 0);

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

/*
 * Initialize the ACLs of a new inode. Called from ext2_new_inode.
 *
 * dir->i_mutex: down
 * inode->i_mutex: up (access to inode is still exclusive)
 */
int
ext2_init_acl(struct inode *inode, struct inode *dir)
{
	struct posix_acl *acl = NULL;
	int error = 0;

	if (!S_ISLNK(inode->i_mode)) {
		if (test_opt(dir->i_sb, POSIX_ACL)) {
			acl = ext2_get_acl(dir, ACL_TYPE_DEFAULT);
			if (IS_ERR(acl))
				return PTR_ERR(acl);
		}
		if (!acl)
			inode->i_mode &= ~current_umask();
	}
	if (test_opt(inode->i_sb, POSIX_ACL) && acl) {
		if (S_ISDIR(inode->i_mode)) {
			error = ext2_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) {
			/* This is an extended ACL */
			error = ext2_set_acl(inode, ACL_TYPE_ACCESS, acl);
		}
	}
cleanup:
       posix_acl_release(acl);
       return error;
}

/*
 * Does chmod for an inode that may have an Access Control List. The
 * inode->i_mode field must be updated to the desired value by the caller
 * before calling this function.
 * Returns 0 on success, or a negative error number.
 *
 * We change the ACL rather than storing some ACL entries in the file
 * mode permission bits (which would be more efficient), because that
 * would break once additional permissions (like  ACL_APPEND, ACL_DELETE
 * for directories) are added. There are no more bits available in the
 * file mode.
 *
 * inode->i_mutex: down
 */
int
ext2_acl_chmod(struct inode *inode)
{
	struct posix_acl *acl;
        int error;

	if (!test_opt(inode->i_sb, POSIX_ACL))
		return 0;
	if (S_ISLNK(inode->i_mode))
		return -EOPNOTSUPP;
	acl = ext2_get_acl(inode, ACL_TYPE_ACCESS);
	if (IS_ERR(acl) || !acl)
		return PTR_ERR(acl);
	error = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
	if (error)
		return error;
	error = ext2_set_acl(inode, ACL_TYPE_ACCESS, acl);
	posix_acl_release(acl);
	return error;
}

/*
 * Extended attribut handlers
 */
static size_t
ext2_xattr_list_acl_access(struct dentry *dentry, char *list, size_t list_size,
			   const char *name, size_t name_len, int type)
{
	const size_t size = sizeof(POSIX_ACL_XATTR_ACCESS);

	if (!test_opt(dentry->d_sb, POSIX_ACL))
		return 0;
	if (list && size <= list_size)
		memcpy(list, POSIX_ACL_XATTR_ACCESS, size);
	return size;
}

static size_t
ext2_xattr_list_acl_default(struct dentry *dentry, char *list, size_t list_size,
			    const char *name, size_t name_len, int type)
{
	const size_t size = sizeof(POSIX_ACL_XATTR_DEFAULT);

	if (!test_opt(dentry->d_sb, POSIX_ACL))
		return 0;
	if (list && size <= list_size)
		memcpy(list, POSIX_ACL_XATTR_DEFAULT, size);
	return size;
}

static int
ext2_xattr_get_acl(struct dentry *dentry, const char *name, void *buffer,
		   size_t size, int type)
{
	struct posix_acl *acl;
	int error;

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

	acl = ext2_get_acl(dentry->d_inode, type);
	if (IS_ERR(acl))
		return PTR_ERR(acl);
	if (acl == NULL)
		return -ENODATA;
	error = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
	posix_acl_release(acl);

	return error;
}

static int
ext2_xattr_set_acl(struct dentry *dentry, const char *name, const void *value,
		   size_t size, int flags, int type)
{
	struct posix_acl *acl;
	int error;

	if (strcmp(name, "") != 0)
		return -EINVAL;
	if (!test_opt(dentry->d_sb, POSIX_ACL))
		return -EOPNOTSUPP;
	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);
		else if (acl) {
			error = posix_acl_valid(acl);
			if (error)
				goto release_and_out;
		}
	} else
		acl = NULL;

	error = ext2_set_acl(dentry->d_inode, type, acl);

release_and_out:
	posix_acl_release(acl);
	return error;
}

const struct xattr_handler ext2_xattr_acl_access_handler = {
	.prefix	= POSIX_ACL_XATTR_ACCESS,
	.flags	= ACL_TYPE_ACCESS,
	.list	= ext2_xattr_list_acl_access,
	.get	= ext2_xattr_get_acl,
	.set	= ext2_xattr_set_acl,
};

const struct xattr_handler ext2_xattr_acl_default_handler = {
	.prefix	= POSIX_ACL_XATTR_DEFAULT,
	.flags	= ACL_TYPE_DEFAULT,
	.list	= ext2_xattr_list_acl_default,
	.get	= ext2_xattr_get_acl,
	.set	= ext2_xattr_set_acl,
};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/ext2/acl.c
	3	*
	4	* Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de>
	5	*/
	6
16f7e0fe	7	#include <linux/capability.h>
1da177e4 LT	8	#include <linux/init.h>
	9	#include <linux/sched.h>
	10	#include <linux/slab.h>
	11	#include <linux/fs.h>
	12	#include "ext2.h"
	13	#include "xattr.h"
	14	#include "acl.h"
	15
	16	/*
	17	* Convert from filesystem to in-memory representation.
	18	*/
	19	static struct posix_acl *
	20	ext2_acl_from_disk(const void *value, size_t size)
	21	{
	22	const char end = (char )value + size;
	23	int n, count;
	24	struct posix_acl *acl;
	25
	26	if (!value)
	27	return NULL;
	28	if (size < sizeof(ext2_acl_header))
	29	return ERR_PTR(-EINVAL);
	30	if (((ext2_acl_header *)value)->a_version !=
	31	cpu_to_le32(EXT2_ACL_VERSION))
	32	return ERR_PTR(-EINVAL);
	33	value = (char *)value + sizeof(ext2_acl_header);
	34	count = ext2_acl_count(size);
	35	if (count < 0)
	36	return ERR_PTR(-EINVAL);
	37	if (count == 0)
	38	return NULL;
	39	acl = posix_acl_alloc(count, GFP_KERNEL);
	40	if (!acl)
	41	return ERR_PTR(-ENOMEM);
	42	for (n=0; n < count; n++) {
	43	ext2_acl_entry *entry =
	44	(ext2_acl_entry *)value;
	45	if ((char *)value + sizeof(ext2_acl_entry_short) > end)
	46	goto fail;
	47	acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag);
	48	acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm);
	49	switch(acl->a_entries[n].e_tag) {
	50	case ACL_USER_OBJ:
	51	case ACL_GROUP_OBJ:
	52	case ACL_MASK:
	53	case ACL_OTHER:
	54	value = (char *)value +
	55	sizeof(ext2_acl_entry_short);
1da177e4 LT	56	break;
	57
	58	case ACL_USER:
af84df93 EB	59	value = (char *)value + sizeof(ext2_acl_entry);
	60	if ((char *)value > end)
	61	goto fail;
	62	acl->a_entries[n].e_uid =
	63	make_kuid(&init_user_ns,
	64	le32_to_cpu(entry->e_id));
	65	break;
1da177e4 LT	66	case ACL_GROUP:
	67	value = (char *)value + sizeof(ext2_acl_entry);
	68	if ((char *)value > end)
	69	goto fail;
af84df93 EB	70	acl->a_entries[n].e_gid =
	71	make_kgid(&init_user_ns,
	72	le32_to_cpu(entry->e_id));
1da177e4 LT	73	break;
	74
	75	default:
	76	goto fail;
	77	}
	78	}
	79	if (value != end)
	80	goto fail;
	81	return acl;
	82
	83	fail:
	84	posix_acl_release(acl);
	85	return ERR_PTR(-EINVAL);
	86	}
	87
	88	/*
	89	* Convert from in-memory to filesystem representation.
	90	*/
	91	static void *
	92	ext2_acl_to_disk(const struct posix_acl acl, size_t size)
	93	{
	94	ext2_acl_header *ext_acl;
	95	char *e;
	96	size_t n;
	97
	98	*size = ext2_acl_size(acl->a_count);
f52720ca PI	99	ext_acl = kmalloc(sizeof(ext2_acl_header) + acl->a_count *
f52720ca PI	100	sizeof(ext2_acl_entry), GFP_KERNEL);
1da177e4 LT	101	if (!ext_acl)
	102	return ERR_PTR(-ENOMEM);
	103	ext_acl->a_version = cpu_to_le32(EXT2_ACL_VERSION);
	104	e = (char *)ext_acl + sizeof(ext2_acl_header);
	105	for (n=0; n < acl->a_count; n++) {
af84df93	106	const struct posix_acl_entry *acl_e = &acl->a_entries[n];
1da177e4	107	ext2_acl_entry entry = (ext2_acl_entry )e;
af84df93 EB	108	entry->e_tag = cpu_to_le16(acl_e->e_tag);
	109	entry->e_perm = cpu_to_le16(acl_e->e_perm);
	110	switch(acl_e->e_tag) {
1da177e4	111	case ACL_USER:
af84df93 EB	112	entry->e_id = cpu_to_le32(
	113	from_kuid(&init_user_ns, acl_e->e_uid));
	114	e += sizeof(ext2_acl_entry);
	115	break;
1da177e4	116	case ACL_GROUP:
af84df93 EB	117	entry->e_id = cpu_to_le32(
af84df93 EB	118	from_kgid(&init_user_ns, acl_e->e_gid));
1da177e4 LT	119	e += sizeof(ext2_acl_entry);
	120	break;
	121
	122	case ACL_USER_OBJ:
	123	case ACL_GROUP_OBJ:
	124	case ACL_MASK:
	125	case ACL_OTHER:
	126	e += sizeof(ext2_acl_entry_short);
	127	break;
	128
	129	default:
	130	goto fail;
	131	}
	132	}
	133	return (char *)ext_acl;
	134
	135	fail:
	136	kfree(ext_acl);
	137	return ERR_PTR(-EINVAL);
	138	}
	139
1da177e4	140	/*
1b1dcc1b	141	* inode->i_mutex: don't care
1da177e4	142	*/
4e34e719	143	struct posix_acl *
1da177e4 LT	144	ext2_get_acl(struct inode *inode, int type)
1da177e4 LT	145	{
1da177e4 LT	146	int name_index;
	147	char *value = NULL;
	148	struct posix_acl *acl;
	149	int retval;
	150
	151	if (!test_opt(inode->i_sb, POSIX_ACL))
	152	return NULL;
	153
073aaa1b AV	154	acl = get_cached_acl(inode, type);
	155	if (acl != ACL_NOT_CACHED)
	156	return acl;
	157
	158	switch (type) {
	159	case ACL_TYPE_ACCESS:
	160	name_index = EXT2_XATTR_INDEX_POSIX_ACL_ACCESS;
	161	break;
	162	case ACL_TYPE_DEFAULT:
	163	name_index = EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT;
	164	break;
	165	default:
	166	BUG();
1da177e4 LT	167	}
	168	retval = ext2_xattr_get(inode, name_index, "", NULL, 0);
	169	if (retval > 0) {
	170	value = kmalloc(retval, GFP_KERNEL);
	171	if (!value)
	172	return ERR_PTR(-ENOMEM);
	173	retval = ext2_xattr_get(inode, name_index, "", value, retval);
	174	}
	175	if (retval > 0)
	176	acl = ext2_acl_from_disk(value, retval);
	177	else if (retval == -ENODATA \|\| retval == -ENOSYS)
	178	acl = NULL;
	179	else
	180	acl = ERR_PTR(retval);
f99d49ad	181	kfree(value);
1da177e4	182
073aaa1b AV	183	if (!IS_ERR(acl))
073aaa1b AV	184	set_cached_acl(inode, type, acl);
1da177e4	185
1da177e4 LT	186	return acl;
	187	}
	188
	189	/*
1b1dcc1b	190	* inode->i_mutex: down
1da177e4 LT	191	*/
	192	static int
	193	ext2_set_acl(struct inode inode, int type, struct posix_acl acl)
	194	{
1da177e4 LT	195	int name_index;
1da177e4 LT	196	void *value = NULL;
dfa08592	197	size_t size = 0;
1da177e4 LT	198	int error;
	199
	200	if (S_ISLNK(inode->i_mode))
	201	return -EOPNOTSUPP;
	202	if (!test_opt(inode->i_sb, POSIX_ACL))
	203	return 0;
	204
	205	switch(type) {
	206	case ACL_TYPE_ACCESS:
	207	name_index = EXT2_XATTR_INDEX_POSIX_ACL_ACCESS;
	208	if (acl) {
d6952123	209	error = posix_acl_equiv_mode(acl, &inode->i_mode);
1da177e4 LT	210	if (error < 0)
	211	return error;
	212	else {
523825bc	213	inode->i_ctime = CURRENT_TIME_SEC;
1da177e4 LT	214	mark_inode_dirty(inode);
	215	if (error == 0)
	216	acl = NULL;
	217	}
	218	}
	219	break;
	220
	221	case ACL_TYPE_DEFAULT:
	222	name_index = EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT;
	223	if (!S_ISDIR(inode->i_mode))
	224	return acl ? -EACCES : 0;
	225	break;
	226
	227	default:
	228	return -EINVAL;
	229	}
	230	if (acl) {
	231	value = ext2_acl_to_disk(acl, &size);
	232	if (IS_ERR(value))
	233	return (int)PTR_ERR(value);
	234	}
	235
	236	error = ext2_xattr_set(inode, name_index, "", value, size, 0);
	237
f99d49ad	238	kfree(value);
073aaa1b AV	239	if (!error)
073aaa1b AV	240	set_cached_acl(inode, type, acl);
1da177e4 LT	241	return error;
	242	}
	243
1da177e4 LT	244	/*
	245	* Initialize the ACLs of a new inode. Called from ext2_new_inode.
	246	*
1b1dcc1b JS	247	* dir->i_mutex: down
1b1dcc1b JS	248	* inode->i_mutex: up (access to inode is still exclusive)
1da177e4 LT	249	*/
	250	int
	251	ext2_init_acl(struct inode inode, struct inode dir)
	252	{
	253	struct posix_acl *acl = NULL;
	254	int error = 0;
	255
	256	if (!S_ISLNK(inode->i_mode)) {
	257	if (test_opt(dir->i_sb, POSIX_ACL)) {
	258	acl = ext2_get_acl(dir, ACL_TYPE_DEFAULT);
	259	if (IS_ERR(acl))
	260	return PTR_ERR(acl);
	261	}
	262	if (!acl)
ce3b0f8d	263	inode->i_mode &= ~current_umask();
1da177e4 LT	264	}
1da177e4 LT	265	if (test_opt(inode->i_sb, POSIX_ACL) && acl) {
1da177e4 LT	266	if (S_ISDIR(inode->i_mode)) {
	267	error = ext2_set_acl(inode, ACL_TYPE_DEFAULT, acl);
	268	if (error)
	269	goto cleanup;
	270	}
d3fb6120	271	error = posix_acl_create(&acl, GFP_KERNEL, &inode->i_mode);
826cae2f AV	272	if (error < 0)
826cae2f AV	273	return error;
826cae2f AV	274	if (error > 0) {
	275	/* This is an extended ACL */
	276	error = ext2_set_acl(inode, ACL_TYPE_ACCESS, acl);
1da177e4	277	}
1da177e4 LT	278	}
	279	cleanup:
	280	posix_acl_release(acl);
	281	return error;
	282	}
	283
	284	/*
	285	* Does chmod for an inode that may have an Access Control List. The
	286	* inode->i_mode field must be updated to the desired value by the caller
	287	* before calling this function.
	288	* Returns 0 on success, or a negative error number.
	289	*
	290	* We change the ACL rather than storing some ACL entries in the file
	291	* mode permission bits (which would be more efficient), because that
	292	* would break once additional permissions (like ACL_APPEND, ACL_DELETE
	293	* for directories) are added. There are no more bits available in the
	294	* file mode.
	295	*
1b1dcc1b	296	* inode->i_mutex: down
1da177e4 LT	297	*/
	298	int
	299	ext2_acl_chmod(struct inode *inode)
	300	{
bc26ab5f	301	struct posix_acl *acl;
1da177e4 LT	302	int error;
	303
	304	if (!test_opt(inode->i_sb, POSIX_ACL))
	305	return 0;
	306	if (S_ISLNK(inode->i_mode))
	307	return -EOPNOTSUPP;
	308	acl = ext2_get_acl(inode, ACL_TYPE_ACCESS);
	309	if (IS_ERR(acl) \|\| !acl)
	310	return PTR_ERR(acl);
bc26ab5f AV	311	error = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
	312	if (error)
	313	return error;
	314	error = ext2_set_acl(inode, ACL_TYPE_ACCESS, acl);
1da177e4	315	posix_acl_release(acl);
1da177e4 LT	316	return error;
	317	}
	318
	319	/*
	320	* Extended attribut handlers
	321	*/
	322	static size_t
431547b3 CH	323	ext2_xattr_list_acl_access(struct dentry dentry, char list, size_t list_size,
431547b3 CH	324	const char *name, size_t name_len, int type)
1da177e4	325	{
9a59f452	326	const size_t size = sizeof(POSIX_ACL_XATTR_ACCESS);
1da177e4	327
431547b3	328	if (!test_opt(dentry->d_sb, POSIX_ACL))
1da177e4 LT	329	return 0;
1da177e4 LT	330	if (list && size <= list_size)
9a59f452	331	memcpy(list, POSIX_ACL_XATTR_ACCESS, size);
1da177e4 LT	332	return size;
	333	}
	334
	335	static size_t
431547b3 CH	336	ext2_xattr_list_acl_default(struct dentry dentry, char list, size_t list_size,
431547b3 CH	337	const char *name, size_t name_len, int type)
1da177e4	338	{
9a59f452	339	const size_t size = sizeof(POSIX_ACL_XATTR_DEFAULT);
1da177e4	340
431547b3	341	if (!test_opt(dentry->d_sb, POSIX_ACL))
1da177e4 LT	342	return 0;
1da177e4 LT	343	if (list && size <= list_size)
9a59f452	344	memcpy(list, POSIX_ACL_XATTR_DEFAULT, size);
1da177e4 LT	345	return size;
	346	}
	347
	348	static int
431547b3 CH	349	ext2_xattr_get_acl(struct dentry dentry, const char name, void *buffer,
431547b3 CH	350	size_t size, int type)
1da177e4 LT	351	{
	352	struct posix_acl *acl;
	353	int error;
	354
431547b3 CH	355	if (strcmp(name, "") != 0)
	356	return -EINVAL;
	357	if (!test_opt(dentry->d_sb, POSIX_ACL))
1da177e4 LT	358	return -EOPNOTSUPP;
1da177e4 LT	359
431547b3	360	acl = ext2_get_acl(dentry->d_inode, type);
1da177e4 LT	361	if (IS_ERR(acl))
	362	return PTR_ERR(acl);
	363	if (acl == NULL)
	364	return -ENODATA;
5f3a4a28	365	error = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
1da177e4 LT	366	posix_acl_release(acl);
	367
	368	return error;
	369	}
	370
	371	static int
431547b3 CH	372	ext2_xattr_set_acl(struct dentry dentry, const char name, const void *value,
431547b3 CH	373	size_t size, int flags, int type)
1da177e4 LT	374	{
	375	struct posix_acl *acl;
	376	int error;
	377
431547b3 CH	378	if (strcmp(name, "") != 0)
	379	return -EINVAL;
	380	if (!test_opt(dentry->d_sb, POSIX_ACL))
1da177e4	381	return -EOPNOTSUPP;
2e149670	382	if (!inode_owner_or_capable(dentry->d_inode))
1da177e4 LT	383	return -EPERM;
	384
	385	if (value) {
5f3a4a28	386	acl = posix_acl_from_xattr(&init_user_ns, value, size);
1da177e4 LT	387	if (IS_ERR(acl))
	388	return PTR_ERR(acl);
	389	else if (acl) {
	390	error = posix_acl_valid(acl);
	391	if (error)
	392	goto release_and_out;
	393	}
	394	} else
	395	acl = NULL;
	396
431547b3	397	error = ext2_set_acl(dentry->d_inode, type, acl);
1da177e4 LT	398
	399	release_and_out:
	400	posix_acl_release(acl);
	401	return error;
	402	}
	403
749c72ef	404	const struct xattr_handler ext2_xattr_acl_access_handler = {
9a59f452	405	.prefix = POSIX_ACL_XATTR_ACCESS,
431547b3	406	.flags = ACL_TYPE_ACCESS,
1da177e4	407	.list = ext2_xattr_list_acl_access,
431547b3 CH	408	.get = ext2_xattr_get_acl,
431547b3 CH	409	.set = ext2_xattr_set_acl,
1da177e4 LT	410	};
1da177e4 LT	411
749c72ef	412	const struct xattr_handler ext2_xattr_acl_default_handler = {
9a59f452	413	.prefix = POSIX_ACL_XATTR_DEFAULT,
431547b3	414	.flags = ACL_TYPE_DEFAULT,
1da177e4	415	.list = ext2_xattr_list_acl_default,
431547b3 CH	416	.get = ext2_xattr_get_acl,
431547b3 CH	417	.set = ext2_xattr_set_acl,
1da177e4	418	};