[linux.git] / fs / posix_acl.c

/*
 * linux/fs/posix_acl.c
 *
 *  Copyright (C) 2002 by Andreas Gruenbacher <[email protected]>
 *
 *  Fixes from William Schumacher incorporated on 15 March 2001.
 *     (Reported by Charles Bertsch, <[email protected]>).
 */

/*
 *  This file contains generic functions for manipulating
 *  POSIX 1003.1e draft standard 17 ACLs.
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/atomic.h>
#include <linux/fs.h>
#include <linux/sched.h>
#include <linux/posix_acl.h>
#include <linux/module.h>

#include <linux/errno.h>

EXPORT_SYMBOL(posix_acl_init);
EXPORT_SYMBOL(posix_acl_alloc);
EXPORT_SYMBOL(posix_acl_valid);
EXPORT_SYMBOL(posix_acl_equiv_mode);
EXPORT_SYMBOL(posix_acl_from_mode);

/*
 * Init a fresh posix_acl
 */
void
posix_acl_init(struct posix_acl *acl, int count)
{
	atomic_set(&acl->a_refcount, 1);
	acl->a_count = count;
}

/*
 * Allocate a new ACL with the specified number of entries.
 */
struct posix_acl *
posix_acl_alloc(int count, gfp_t flags)
{
	const size_t size = sizeof(struct posix_acl) +
	                    count * sizeof(struct posix_acl_entry);
	struct posix_acl *acl = kmalloc(size, flags);
	if (acl)
		posix_acl_init(acl, count);
	return acl;
}

/*
 * Clone an ACL.
 */
static struct posix_acl *
posix_acl_clone(const struct posix_acl *acl, gfp_t flags)
{
	struct posix_acl *clone = NULL;

	if (acl) {
		int size = sizeof(struct posix_acl) + acl->a_count *
		           sizeof(struct posix_acl_entry);
		clone = kmemdup(acl, size, flags);
		if (clone)
			atomic_set(&clone->a_refcount, 1);
	}
	return clone;
}

/*
 * Check if an acl is valid. Returns 0 if it is, or -E... otherwise.
 */
int
posix_acl_valid(const struct posix_acl *acl)
{
	const struct posix_acl_entry *pa, *pe;
	int state = ACL_USER_OBJ;
	unsigned int id = 0;  /* keep gcc happy */
	int needs_mask = 0;

	FOREACH_ACL_ENTRY(pa, acl, pe) {
		if (pa->e_perm & ~(ACL_READ|ACL_WRITE|ACL_EXECUTE))
			return -EINVAL;
		switch (pa->e_tag) {
			case ACL_USER_OBJ:
				if (state == ACL_USER_OBJ) {
					id = 0;
					state = ACL_USER;
					break;
				}
				return -EINVAL;

			case ACL_USER:
				if (state != ACL_USER)
					return -EINVAL;
				if (pa->e_id == ACL_UNDEFINED_ID ||
				    pa->e_id < id)
					return -EINVAL;
				id = pa->e_id + 1;
				needs_mask = 1;
				break;

			case ACL_GROUP_OBJ:
				if (state == ACL_USER) {
					id = 0;
					state = ACL_GROUP;
					break;
				}
				return -EINVAL;

			case ACL_GROUP:
				if (state != ACL_GROUP)
					return -EINVAL;
				if (pa->e_id == ACL_UNDEFINED_ID ||
				    pa->e_id < id)
					return -EINVAL;
				id = pa->e_id + 1;
				needs_mask = 1;
				break;

			case ACL_MASK:
				if (state != ACL_GROUP)
					return -EINVAL;
				state = ACL_OTHER;
				break;

			case ACL_OTHER:
				if (state == ACL_OTHER ||
				    (state == ACL_GROUP && !needs_mask)) {
					state = 0;
					break;
				}
				return -EINVAL;

			default:
				return -EINVAL;
		}
	}
	if (state == 0)
		return 0;
	return -EINVAL;
}

/*
 * Returns 0 if the acl can be exactly represented in the traditional
 * file mode permission bits, or else 1. Returns -E... on error.
 */
int
posix_acl_equiv_mode(const struct posix_acl *acl, umode_t *mode_p)
{
	const struct posix_acl_entry *pa, *pe;
	umode_t mode = 0;
	int not_equiv = 0;

	FOREACH_ACL_ENTRY(pa, acl, pe) {
		switch (pa->e_tag) {
			case ACL_USER_OBJ:
				mode |= (pa->e_perm & S_IRWXO) << 6;
				break;
			case ACL_GROUP_OBJ:
				mode |= (pa->e_perm & S_IRWXO) << 3;
				break;
			case ACL_OTHER:
				mode |= pa->e_perm & S_IRWXO;
				break;
			case ACL_MASK:
				mode = (mode & ~S_IRWXG) |
				       ((pa->e_perm & S_IRWXO) << 3);
				not_equiv = 1;
				break;
			case ACL_USER:
			case ACL_GROUP:
				not_equiv = 1;
				break;
			default:
				return -EINVAL;
		}
	}
        if (mode_p)
                *mode_p = (*mode_p & ~S_IRWXUGO) | mode;
        return not_equiv;
}

/*
 * Create an ACL representing the file mode permission bits of an inode.
 */
struct posix_acl *
posix_acl_from_mode(umode_t mode, gfp_t flags)
{
	struct posix_acl *acl = posix_acl_alloc(3, flags);
	if (!acl)
		return ERR_PTR(-ENOMEM);

	acl->a_entries[0].e_tag  = ACL_USER_OBJ;
	acl->a_entries[0].e_id   = ACL_UNDEFINED_ID;
	acl->a_entries[0].e_perm = (mode & S_IRWXU) >> 6;

	acl->a_entries[1].e_tag  = ACL_GROUP_OBJ;
	acl->a_entries[1].e_id   = ACL_UNDEFINED_ID;
	acl->a_entries[1].e_perm = (mode & S_IRWXG) >> 3;

	acl->a_entries[2].e_tag  = ACL_OTHER;
	acl->a_entries[2].e_id   = ACL_UNDEFINED_ID;
	acl->a_entries[2].e_perm = (mode & S_IRWXO);
	return acl;
}

/*
 * Return 0 if current is granted want access to the inode
 * by the acl. Returns -E... otherwise.
 */
int
posix_acl_permission(struct inode *inode, const struct posix_acl *acl, int want)
{
	const struct posix_acl_entry *pa, *pe, *mask_obj;
	int found = 0;

	FOREACH_ACL_ENTRY(pa, acl, pe) {
                switch(pa->e_tag) {
                        case ACL_USER_OBJ:
				/* (May have been checked already) */
				if (inode->i_uid == current_fsuid())
                                        goto check_perm;
                                break;
                        case ACL_USER:
				if (pa->e_id == current_fsuid())
                                        goto mask;
				break;
                        case ACL_GROUP_OBJ:
                                if (in_group_p(inode->i_gid)) {
					found = 1;
					if ((pa->e_perm & want) == want)
						goto mask;
                                }
				break;
                        case ACL_GROUP:
                                if (in_group_p(pa->e_id)) {
					found = 1;
					if ((pa->e_perm & want) == want)
						goto mask;
                                }
                                break;
                        case ACL_MASK:
                                break;
                        case ACL_OTHER:
				if (found)
					return -EACCES;
				else
					goto check_perm;
			default:
				return -EIO;
                }
        }
	return -EIO;

mask:
	for (mask_obj = pa+1; mask_obj != pe; mask_obj++) {
		if (mask_obj->e_tag == ACL_MASK) {
			if ((pa->e_perm & mask_obj->e_perm & want) == want)
				return 0;
			return -EACCES;
		}
	}

check_perm:
	if ((pa->e_perm & want) == want)
		return 0;
	return -EACCES;
}

/*
 * Modify acl when creating a new inode. The caller must ensure the acl is
 * only referenced once.
 *
 * mode_p initially must contain the mode parameter to the open() / creat()
 * system calls. All permissions that are not granted by the acl are removed.
 * The permissions in the acl are changed to reflect the mode_p parameter.
 */
static int posix_acl_create_masq(struct posix_acl *acl, umode_t *mode_p)
{
	struct posix_acl_entry *pa, *pe;
	struct posix_acl_entry *group_obj = NULL, *mask_obj = NULL;
	umode_t mode = *mode_p;
	int not_equiv = 0;

	/* assert(atomic_read(acl->a_refcount) == 1); */

	FOREACH_ACL_ENTRY(pa, acl, pe) {
                switch(pa->e_tag) {
                        case ACL_USER_OBJ:
				pa->e_perm &= (mode >> 6) | ~S_IRWXO;
				mode &= (pa->e_perm << 6) | ~S_IRWXU;
				break;

			case ACL_USER:
			case ACL_GROUP:
				not_equiv = 1;
				break;

                        case ACL_GROUP_OBJ:
				group_obj = pa;
                                break;

                        case ACL_OTHER:
				pa->e_perm &= mode | ~S_IRWXO;
				mode &= pa->e_perm | ~S_IRWXO;
                                break;

                        case ACL_MASK:
				mask_obj = pa;
				not_equiv = 1;
                                break;

			default:
				return -EIO;
                }
        }

	if (mask_obj) {
		mask_obj->e_perm &= (mode >> 3) | ~S_IRWXO;
		mode &= (mask_obj->e_perm << 3) | ~S_IRWXG;
	} else {
		if (!group_obj)
			return -EIO;
		group_obj->e_perm &= (mode >> 3) | ~S_IRWXO;
		mode &= (group_obj->e_perm << 3) | ~S_IRWXG;
	}

	*mode_p = (*mode_p & ~S_IRWXUGO) | mode;
        return not_equiv;
}

/*
 * Modify the ACL for the chmod syscall.
 */
static int posix_acl_chmod_masq(struct posix_acl *acl, umode_t mode)
{
	struct posix_acl_entry *group_obj = NULL, *mask_obj = NULL;
	struct posix_acl_entry *pa, *pe;

	/* assert(atomic_read(acl->a_refcount) == 1); */

	FOREACH_ACL_ENTRY(pa, acl, pe) {
		switch(pa->e_tag) {
			case ACL_USER_OBJ:
				pa->e_perm = (mode & S_IRWXU) >> 6;
				break;

			case ACL_USER:
			case ACL_GROUP:
				break;

			case ACL_GROUP_OBJ:
				group_obj = pa;
				break;

			case ACL_MASK:
				mask_obj = pa;
				break;

			case ACL_OTHER:
				pa->e_perm = (mode & S_IRWXO);
				break;

			default:
				return -EIO;
		}
	}

	if (mask_obj) {
		mask_obj->e_perm = (mode & S_IRWXG) >> 3;
	} else {
		if (!group_obj)
			return -EIO;
		group_obj->e_perm = (mode & S_IRWXG) >> 3;
	}

	return 0;
}

int
posix_acl_create(struct posix_acl **acl, gfp_t gfp, umode_t *mode_p)
{
	struct posix_acl *clone = posix_acl_clone(*acl, gfp);
	int err = -ENOMEM;
	if (clone) {
		err = posix_acl_create_masq(clone, mode_p);
		if (err < 0) {
			posix_acl_release(clone);
			clone = NULL;
		}
	}
	posix_acl_release(*acl);
	*acl = clone;
	return err;
}
EXPORT_SYMBOL(posix_acl_create);

int
posix_acl_chmod(struct posix_acl **acl, gfp_t gfp, umode_t mode)
{
	struct posix_acl *clone = posix_acl_clone(*acl, gfp);
	int err = -ENOMEM;
	if (clone) {
		err = posix_acl_chmod_masq(clone, mode);
		if (err) {
			posix_acl_release(clone);
			clone = NULL;
		}
	}
	posix_acl_release(*acl);
	*acl = clone;
	return err;
}
EXPORT_SYMBOL(posix_acl_chmod);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/posix_acl.c
	3	*
	4	* Copyright (C) 2002 by Andreas Gruenbacher <[email protected]>
	5	*
	6	* Fixes from William Schumacher incorporated on 15 March 2001.
	7	* (Reported by Charles Bertsch, <[email protected]>).
	8	*/
	9
	10	/*
	11	* This file contains generic functions for manipulating
	12	* POSIX 1003.1e draft standard 17 ACLs.
	13	*/
	14
	15	#include <linux/kernel.h>
	16	#include <linux/slab.h>
60063497	17	#include <linux/atomic.h>
1da177e4 LT	18	#include <linux/fs.h>
	19	#include <linux/sched.h>
	20	#include <linux/posix_acl.h>
	21	#include <linux/module.h>
	22
	23	#include <linux/errno.h>
	24
f61f6da0	25	EXPORT_SYMBOL(posix_acl_init);
1da177e4	26	EXPORT_SYMBOL(posix_acl_alloc);
1da177e4 LT	27	EXPORT_SYMBOL(posix_acl_valid);
	28	EXPORT_SYMBOL(posix_acl_equiv_mode);
	29	EXPORT_SYMBOL(posix_acl_from_mode);
1da177e4	30
f61f6da0 CL	31	/*
	32	* Init a fresh posix_acl
	33	*/
	34	void
	35	posix_acl_init(struct posix_acl *acl, int count)
	36	{
	37	atomic_set(&acl->a_refcount, 1);
	38	acl->a_count = count;
	39	}
	40
1da177e4 LT	41	/*
	42	* Allocate a new ACL with the specified number of entries.
	43	*/
	44	struct posix_acl *
dd0fc66f	45	posix_acl_alloc(int count, gfp_t flags)
1da177e4 LT	46	{
	47	const size_t size = sizeof(struct posix_acl) +
	48	count * sizeof(struct posix_acl_entry);
	49	struct posix_acl *acl = kmalloc(size, flags);
f61f6da0 CL	50	if (acl)
f61f6da0 CL	51	posix_acl_init(acl, count);
1da177e4 LT	52	return acl;
	53	}
	54
	55	/*
	56	* Clone an ACL.
	57	*/
edde854e	58	static struct posix_acl *
dd0fc66f	59	posix_acl_clone(const struct posix_acl *acl, gfp_t flags)
1da177e4 LT	60	{
	61	struct posix_acl *clone = NULL;
	62
	63	if (acl) {
	64	int size = sizeof(struct posix_acl) + acl->a_count *
	65	sizeof(struct posix_acl_entry);
52978be6 AD	66	clone = kmemdup(acl, size, flags);
52978be6 AD	67	if (clone)
1da177e4	68	atomic_set(&clone->a_refcount, 1);
1da177e4 LT	69	}
	70	return clone;
	71	}
	72
	73	/*
	74	* Check if an acl is valid. Returns 0 if it is, or -E... otherwise.
	75	*/
	76	int
	77	posix_acl_valid(const struct posix_acl *acl)
	78	{
	79	const struct posix_acl_entry pa, pe;
	80	int state = ACL_USER_OBJ;
	81	unsigned int id = 0; /* keep gcc happy */
	82	int needs_mask = 0;
	83
	84	FOREACH_ACL_ENTRY(pa, acl, pe) {
	85	if (pa->e_perm & ~(ACL_READ\|ACL_WRITE\|ACL_EXECUTE))
	86	return -EINVAL;
	87	switch (pa->e_tag) {
	88	case ACL_USER_OBJ:
	89	if (state == ACL_USER_OBJ) {
	90	id = 0;
	91	state = ACL_USER;
	92	break;
	93	}
	94	return -EINVAL;
	95
	96	case ACL_USER:
	97	if (state != ACL_USER)
	98	return -EINVAL;
	99	if (pa->e_id == ACL_UNDEFINED_ID \|\|
	100	pa->e_id < id)
	101	return -EINVAL;
	102	id = pa->e_id + 1;
	103	needs_mask = 1;
	104	break;
	105
	106	case ACL_GROUP_OBJ:
	107	if (state == ACL_USER) {
	108	id = 0;
	109	state = ACL_GROUP;
	110	break;
	111	}
	112	return -EINVAL;
	113
	114	case ACL_GROUP:
	115	if (state != ACL_GROUP)
	116	return -EINVAL;
	117	if (pa->e_id == ACL_UNDEFINED_ID \|\|
	118	pa->e_id < id)
	119	return -EINVAL;
	120	id = pa->e_id + 1;
	121	needs_mask = 1;
	122	break;
	123
	124	case ACL_MASK:
	125	if (state != ACL_GROUP)
	126	return -EINVAL;
	127	state = ACL_OTHER;
	128	break;
	129
	130	case ACL_OTHER:
	131	if (state == ACL_OTHER \|\|
	132	(state == ACL_GROUP && !needs_mask)) {
133	state = 0;
134	break;
135	}
136	return -EINVAL;
137
138	default:
139	return -EINVAL;
140	}
141	}
142	if (state == 0)
143	return 0;
144	return -EINVAL;
145	}
146
147	/*
148	* Returns 0 if the acl can be exactly represented in the traditional
149	* file mode permission bits, or else 1. Returns -E... on error.
150	*/
151	int
d6952123	152	posix_acl_equiv_mode(const struct posix_acl acl, umode_t mode_p)
1da177e4 LT	153	{
1da177e4 LT	154	const struct posix_acl_entry pa, pe;
d6952123	155	umode_t mode = 0;
1da177e4 LT	156	int not_equiv = 0;
	157
	158	FOREACH_ACL_ENTRY(pa, acl, pe) {
	159	switch (pa->e_tag) {
	160	case ACL_USER_OBJ:
	161	mode \|= (pa->e_perm & S_IRWXO) << 6;
	162	break;
	163	case ACL_GROUP_OBJ:
	164	mode \|= (pa->e_perm & S_IRWXO) << 3;
	165	break;
	166	case ACL_OTHER:
	167	mode \|= pa->e_perm & S_IRWXO;
	168	break;
	169	case ACL_MASK:
	170	mode = (mode & ~S_IRWXG) \|
	171	((pa->e_perm & S_IRWXO) << 3);
	172	not_equiv = 1;
	173	break;
	174	case ACL_USER:
	175	case ACL_GROUP:
	176	not_equiv = 1;
	177	break;
	178	default:
	179	return -EINVAL;
	180	}
	181	}
	182	if (mode_p)
	183	mode_p = (mode_p & ~S_IRWXUGO) \| mode;
	184	return not_equiv;
	185	}
	186
	187	/*
	188	* Create an ACL representing the file mode permission bits of an inode.
	189	*/
	190	struct posix_acl *
3a5fba19	191	posix_acl_from_mode(umode_t mode, gfp_t flags)
1da177e4 LT	192	{
	193	struct posix_acl *acl = posix_acl_alloc(3, flags);
	194	if (!acl)
	195	return ERR_PTR(-ENOMEM);
	196
	197	acl->a_entries[0].e_tag = ACL_USER_OBJ;
	198	acl->a_entries[0].e_id = ACL_UNDEFINED_ID;
	199	acl->a_entries[0].e_perm = (mode & S_IRWXU) >> 6;
	200
	201	acl->a_entries[1].e_tag = ACL_GROUP_OBJ;
	202	acl->a_entries[1].e_id = ACL_UNDEFINED_ID;
	203	acl->a_entries[1].e_perm = (mode & S_IRWXG) >> 3;
	204
	205	acl->a_entries[2].e_tag = ACL_OTHER;
	206	acl->a_entries[2].e_id = ACL_UNDEFINED_ID;
	207	acl->a_entries[2].e_perm = (mode & S_IRWXO);
	208	return acl;
	209	}
	210
	211	/*
	212	* Return 0 if current is granted want access to the inode
	213	* by the acl. Returns -E... otherwise.
	214	*/
	215	int
	216	posix_acl_permission(struct inode inode, const struct posix_acl acl, int want)
	217	{
	218	const struct posix_acl_entry pa, pe, *mask_obj;
	219	int found = 0;
	220
	221	FOREACH_ACL_ENTRY(pa, acl, pe) {
	222	switch(pa->e_tag) {
	223	case ACL_USER_OBJ:
	224	/* (May have been checked already) */
da9592ed	225	if (inode->i_uid == current_fsuid())
1da177e4 LT	226	goto check_perm;
	227	break;
	228	case ACL_USER:
da9592ed	229	if (pa->e_id == current_fsuid())
1da177e4 LT	230	goto mask;
	231	break;
	232	case ACL_GROUP_OBJ:
	233	if (in_group_p(inode->i_gid)) {
	234	found = 1;
	235	if ((pa->e_perm & want) == want)
	236	goto mask;
	237	}
	238	break;
	239	case ACL_GROUP:
	240	if (in_group_p(pa->e_id)) {
	241	found = 1;
	242	if ((pa->e_perm & want) == want)
	243	goto mask;
	244	}
	245	break;
	246	case ACL_MASK:
	247	break;
	248	case ACL_OTHER:
	249	if (found)
	250	return -EACCES;
	251	else
	252	goto check_perm;
	253	default:
	254	return -EIO;
	255	}
	256	}
	257	return -EIO;
	258
	259	mask:
	260	for (mask_obj = pa+1; mask_obj != pe; mask_obj++) {
	261	if (mask_obj->e_tag == ACL_MASK) {
	262	if ((pa->e_perm & mask_obj->e_perm & want) == want)
	263	return 0;
	264	return -EACCES;
	265	}
	266	}
	267
	268	check_perm:
	269	if ((pa->e_perm & want) == want)
	270	return 0;
	271	return -EACCES;
	272	}
	273
	274	/*
	275	* Modify acl when creating a new inode. The caller must ensure the acl is
	276	* only referenced once.
	277	*
	278	* mode_p initially must contain the mode parameter to the open() / creat()
	279	* system calls. All permissions that are not granted by the acl are removed.
	280	* The permissions in the acl are changed to reflect the mode_p parameter.
	281	*/
d3fb6120	282	static int posix_acl_create_masq(struct posix_acl acl, umode_t mode_p)
1da177e4 LT	283	{
	284	struct posix_acl_entry pa, pe;
	285	struct posix_acl_entry group_obj = NULL, mask_obj = NULL;
d3fb6120	286	umode_t mode = *mode_p;
1da177e4 LT	287	int not_equiv = 0;
	288
	289	/* assert(atomic_read(acl->a_refcount) == 1); */
	290
	291	FOREACH_ACL_ENTRY(pa, acl, pe) {
	292	switch(pa->e_tag) {
	293	case ACL_USER_OBJ:
	294	pa->e_perm &= (mode >> 6) \| ~S_IRWXO;
	295	mode &= (pa->e_perm << 6) \| ~S_IRWXU;
	296	break;
	297
	298	case ACL_USER:
	299	case ACL_GROUP:
	300	not_equiv = 1;
	301	break;
	302
	303	case ACL_GROUP_OBJ:
	304	group_obj = pa;
	305	break;
	306
	307	case ACL_OTHER:
	308	pa->e_perm &= mode \| ~S_IRWXO;
	309	mode &= pa->e_perm \| ~S_IRWXO;
	310	break;
	311
	312	case ACL_MASK:
	313	mask_obj = pa;
	314	not_equiv = 1;
	315	break;
	316
	317	default:
	318	return -EIO;
	319	}
	320	}
	321
	322	if (mask_obj) {
	323	mask_obj->e_perm &= (mode >> 3) \| ~S_IRWXO;
	324	mode &= (mask_obj->e_perm << 3) \| ~S_IRWXG;
	325	} else {
	326	if (!group_obj)
	327	return -EIO;
	328	group_obj->e_perm &= (mode >> 3) \| ~S_IRWXO;
	329	mode &= (group_obj->e_perm << 3) \| ~S_IRWXG;
	330	}
	331
	332	mode_p = (mode_p & ~S_IRWXUGO) \| mode;
	333	return not_equiv;
	334	}
	335
	336	/*
	337	* Modify the ACL for the chmod syscall.
	338	*/
86bc704d	339	static int posix_acl_chmod_masq(struct posix_acl *acl, umode_t mode)
1da177e4 LT	340	{
	341	struct posix_acl_entry group_obj = NULL, mask_obj = NULL;
	342	struct posix_acl_entry pa, pe;
	343
	344	/* assert(atomic_read(acl->a_refcount) == 1); */
	345
	346	FOREACH_ACL_ENTRY(pa, acl, pe) {
	347	switch(pa->e_tag) {
	348	case ACL_USER_OBJ:
	349	pa->e_perm = (mode & S_IRWXU) >> 6;
	350	break;
	351
	352	case ACL_USER:
	353	case ACL_GROUP:
	354	break;
	355
	356	case ACL_GROUP_OBJ:
	357	group_obj = pa;
	358	break;
	359
	360	case ACL_MASK:
	361	mask_obj = pa;
	362	break;
	363
	364	case ACL_OTHER:
	365	pa->e_perm = (mode & S_IRWXO);
	366	break;
	367
	368	default:
	369	return -EIO;
	370	}
	371	}
	372
	373	if (mask_obj) {
	374	mask_obj->e_perm = (mode & S_IRWXG) >> 3;
	375	} else {
	376	if (!group_obj)
	377	return -EIO;
	378	group_obj->e_perm = (mode & S_IRWXG) >> 3;
	379	}
	380
	381	return 0;
	382	}
bc26ab5f	383
826cae2f	384	int
d3fb6120	385	posix_acl_create(struct posix_acl *acl, gfp_t gfp, umode_t mode_p)
826cae2f AV	386	{
	387	struct posix_acl clone = posix_acl_clone(acl, gfp);
	388	int err = -ENOMEM;
	389	if (clone) {
	390	err = posix_acl_create_masq(clone, mode_p);
	391	if (err < 0) {
	392	posix_acl_release(clone);
	393	clone = NULL;
	394	}
	395	}
	396	posix_acl_release(*acl);
	397	*acl = clone;
	398	return err;
	399	}
	400	EXPORT_SYMBOL(posix_acl_create);
	401
bc26ab5f	402	int
86bc704d	403	posix_acl_chmod(struct posix_acl **acl, gfp_t gfp, umode_t mode)
bc26ab5f AV	404	{
	405	struct posix_acl clone = posix_acl_clone(acl, gfp);
	406	int err = -ENOMEM;
	407	if (clone) {
	408	err = posix_acl_chmod_masq(clone, mode);
	409	if (err) {
	410	posix_acl_release(clone);
	411	clone = NULL;
	412	}
	413	}
	414	posix_acl_release(*acl);
	415	*acl = clone;
	416	return err;
	417	}
	418	EXPORT_SYMBOL(posix_acl_chmod);