[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / posix_acl.c

/*
 * linux/fs/posix_acl.c
 *
 *  Copyright (C) 2002 by Andreas Gruenbacher <a.gruenbacher@computer.org>
 *
 *  Fixes from William Schumacher incorporated on 15 March 2001.
 *     (Reported by Charles Bertsch, <CBertsch@microtest.com>).
 */

/*
 *  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/export.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;
	kuid_t prev_uid = INVALID_UID;
	kgid_t prev_gid = INVALID_GID;
	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) {
					state = ACL_USER;
					break;
				}
				return -EINVAL;

			case ACL_USER:
				if (state != ACL_USER)
					return -EINVAL;
				if (!uid_valid(pa->e_uid))
					return -EINVAL;
				if (uid_valid(prev_uid) &&
				    uid_lte(pa->e_uid, prev_uid))
					return -EINVAL;
				prev_uid = pa->e_uid;
				needs_mask = 1;
				break;

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

			case ACL_GROUP:
				if (state != ACL_GROUP)
					return -EINVAL;
				if (!gid_valid(pa->e_gid))
					return -EINVAL;
				if (gid_valid(prev_gid) &&
				    gid_lte(pa->e_gid, prev_gid))
					return -EINVAL;
				prev_gid = pa->e_gid;
				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_perm = (mode & S_IRWXU) >> 6;

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

	acl->a_entries[2].e_tag  = ACL_OTHER;
	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;

	want &= MAY_READ | MAY_WRITE | MAY_EXEC | MAY_NOT_BLOCK;

	FOREACH_ACL_ENTRY(pa, acl, pe) {
                switch(pa->e_tag) {
                        case ACL_USER_OBJ:
				/* (May have been checked already) */
				if (uid_eq(inode->i_uid, current_fsuid()))
                                        goto check_perm;
                                break;
                        case ACL_USER:
				if (uid_eq(pa->e_uid, 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_gid)) {
					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 <a.gruenbacher@computer.org>
	5	*
	6	* Fixes from William Schumacher incorporated on 15 March 2001.
	7	* (Reported by Charles Bertsch, <CBertsch@microtest.com>).
	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>
630d9c47	21	#include <linux/export.h>
1da177e4 LT	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;
2f6f0654 EB	81	kuid_t prev_uid = INVALID_UID;
2f6f0654 EB	82	kgid_t prev_gid = INVALID_GID;
1da177e4 LT	83	int needs_mask = 0;
	84
	85	FOREACH_ACL_ENTRY(pa, acl, pe) {
	86	if (pa->e_perm & ~(ACL_READ\|ACL_WRITE\|ACL_EXECUTE))
	87	return -EINVAL;
	88	switch (pa->e_tag) {
	89	case ACL_USER_OBJ:
	90	if (state == ACL_USER_OBJ) {
1da177e4 LT	91	state = ACL_USER;
	92	break;
	93	}
	94	return -EINVAL;
	95
	96	case ACL_USER:
	97	if (state != ACL_USER)
	98	return -EINVAL;
2f6f0654	99	if (!uid_valid(pa->e_uid))
1da177e4	100	return -EINVAL;
2f6f0654 EB	101	if (uid_valid(prev_uid) &&
	102	uid_lte(pa->e_uid, prev_uid))
	103	return -EINVAL;
	104	prev_uid = pa->e_uid;
1da177e4 LT	105	needs_mask = 1;
	106	break;
	107
	108	case ACL_GROUP_OBJ:
	109	if (state == ACL_USER) {
1da177e4 LT	110	state = ACL_GROUP;
	111	break;
	112	}
	113	return -EINVAL;
	114
	115	case ACL_GROUP:
	116	if (state != ACL_GROUP)
	117	return -EINVAL;
2f6f0654 EB	118	if (!gid_valid(pa->e_gid))
	119	return -EINVAL;
	120	if (gid_valid(prev_gid) &&
	121	gid_lte(pa->e_gid, prev_gid))
1da177e4	122	return -EINVAL;
2f6f0654	123	prev_gid = pa->e_gid;
1da177e4 LT	124	needs_mask = 1;
	125	break;
	126
	127	case ACL_MASK:
	128	if (state != ACL_GROUP)
	129	return -EINVAL;
	130	state = ACL_OTHER;
	131	break;
	132
	133	case ACL_OTHER:
	134	if (state == ACL_OTHER \|\|
	135	(state == ACL_GROUP && !needs_mask)) {
	136	state = 0;
	137	break;
	138	}
	139	return -EINVAL;
	140
	141	default:
	142	return -EINVAL;
	143	}
	144	}
	145	if (state == 0)
	146	return 0;
	147	return -EINVAL;
	148	}
	149
	150	/*
	151	* Returns 0 if the acl can be exactly represented in the traditional
	152	* file mode permission bits, or else 1. Returns -E... on error.
	153	*/
	154	int
d6952123	155	posix_acl_equiv_mode(const struct posix_acl acl, umode_t mode_p)
1da177e4 LT	156	{
1da177e4 LT	157	const struct posix_acl_entry pa, pe;
d6952123	158	umode_t mode = 0;
1da177e4 LT	159	int not_equiv = 0;
	160
	161	FOREACH_ACL_ENTRY(pa, acl, pe) {
	162	switch (pa->e_tag) {
	163	case ACL_USER_OBJ:
	164	mode \|= (pa->e_perm & S_IRWXO) << 6;
	165	break;
	166	case ACL_GROUP_OBJ:
	167	mode \|= (pa->e_perm & S_IRWXO) << 3;
	168	break;
	169	case ACL_OTHER:
	170	mode \|= pa->e_perm & S_IRWXO;
	171	break;
	172	case ACL_MASK:
	173	mode = (mode & ~S_IRWXG) \|
	174	((pa->e_perm & S_IRWXO) << 3);
	175	not_equiv = 1;
	176	break;
	177	case ACL_USER:
	178	case ACL_GROUP:
	179	not_equiv = 1;
	180	break;
	181	default:
	182	return -EINVAL;
	183	}
	184	}
	185	if (mode_p)
	186	mode_p = (mode_p & ~S_IRWXUGO) \| mode;
	187	return not_equiv;
	188	}
	189
	190	/*
	191	* Create an ACL representing the file mode permission bits of an inode.
	192	*/
	193	struct posix_acl *
3a5fba19	194	posix_acl_from_mode(umode_t mode, gfp_t flags)
1da177e4 LT	195	{
	196	struct posix_acl *acl = posix_acl_alloc(3, flags);
	197	if (!acl)
	198	return ERR_PTR(-ENOMEM);
	199
	200	acl->a_entries[0].e_tag = ACL_USER_OBJ;
1da177e4 LT	201	acl->a_entries[0].e_perm = (mode & S_IRWXU) >> 6;
	202
	203	acl->a_entries[1].e_tag = ACL_GROUP_OBJ;
1da177e4 LT	204	acl->a_entries[1].e_perm = (mode & S_IRWXG) >> 3;
	205
	206	acl->a_entries[2].e_tag = ACL_OTHER;
1da177e4 LT	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
d124b60a AG	221	want &= MAY_READ \| MAY_WRITE \| MAY_EXEC \| MAY_NOT_BLOCK;
d124b60a AG	222
1da177e4 LT	223	FOREACH_ACL_ENTRY(pa, acl, pe) {
	224	switch(pa->e_tag) {
	225	case ACL_USER_OBJ:
	226	/* (May have been checked already) */
2f6f0654	227	if (uid_eq(inode->i_uid, current_fsuid()))
1da177e4 LT	228	goto check_perm;
	229	break;
	230	case ACL_USER:
2f6f0654	231	if (uid_eq(pa->e_uid, current_fsuid()))
1da177e4 LT	232	goto mask;
	233	break;
	234	case ACL_GROUP_OBJ:
	235	if (in_group_p(inode->i_gid)) {
	236	found = 1;
	237	if ((pa->e_perm & want) == want)
	238	goto mask;
	239	}
	240	break;
	241	case ACL_GROUP:
2f6f0654	242	if (in_group_p(pa->e_gid)) {
1da177e4 LT	243	found = 1;
	244	if ((pa->e_perm & want) == want)
	245	goto mask;
	246	}
	247	break;
	248	case ACL_MASK:
	249	break;
	250	case ACL_OTHER:
	251	if (found)
	252	return -EACCES;
	253	else
	254	goto check_perm;
	255	default:
	256	return -EIO;
	257	}
	258	}
	259	return -EIO;
	260
	261	mask:
	262	for (mask_obj = pa+1; mask_obj != pe; mask_obj++) {
	263	if (mask_obj->e_tag == ACL_MASK) {
	264	if ((pa->e_perm & mask_obj->e_perm & want) == want)
	265	return 0;
	266	return -EACCES;
	267	}
	268	}
	269
	270	check_perm:
	271	if ((pa->e_perm & want) == want)
	272	return 0;
	273	return -EACCES;
	274	}
	275
	276	/*
	277	* Modify acl when creating a new inode. The caller must ensure the acl is
	278	* only referenced once.
	279	*
	280	* mode_p initially must contain the mode parameter to the open() / creat()
	281	* system calls. All permissions that are not granted by the acl are removed.
	282	* The permissions in the acl are changed to reflect the mode_p parameter.
	283	*/
d3fb6120	284	static int posix_acl_create_masq(struct posix_acl acl, umode_t mode_p)
1da177e4 LT	285	{
	286	struct posix_acl_entry pa, pe;
	287	struct posix_acl_entry group_obj = NULL, mask_obj = NULL;
d3fb6120	288	umode_t mode = *mode_p;
1da177e4 LT	289	int not_equiv = 0;
	290
	291	/* assert(atomic_read(acl->a_refcount) == 1); */
	292
	293	FOREACH_ACL_ENTRY(pa, acl, pe) {
	294	switch(pa->e_tag) {
	295	case ACL_USER_OBJ:
	296	pa->e_perm &= (mode >> 6) \| ~S_IRWXO;
	297	mode &= (pa->e_perm << 6) \| ~S_IRWXU;
	298	break;
	299
	300	case ACL_USER:
	301	case ACL_GROUP:
	302	not_equiv = 1;
	303	break;
	304
	305	case ACL_GROUP_OBJ:
	306	group_obj = pa;
	307	break;
	308
	309	case ACL_OTHER:
	310	pa->e_perm &= mode \| ~S_IRWXO;
	311	mode &= pa->e_perm \| ~S_IRWXO;
	312	break;
	313
	314	case ACL_MASK:
	315	mask_obj = pa;
	316	not_equiv = 1;
	317	break;
	318
	319	default:
	320	return -EIO;
	321	}
	322	}
	323
	324	if (mask_obj) {
	325	mask_obj->e_perm &= (mode >> 3) \| ~S_IRWXO;
	326	mode &= (mask_obj->e_perm << 3) \| ~S_IRWXG;
	327	} else {
	328	if (!group_obj)
	329	return -EIO;
	330	group_obj->e_perm &= (mode >> 3) \| ~S_IRWXO;
	331	mode &= (group_obj->e_perm << 3) \| ~S_IRWXG;
	332	}
	333
	334	mode_p = (mode_p & ~S_IRWXUGO) \| mode;
	335	return not_equiv;
	336	}
	337
	338	/*
	339	* Modify the ACL for the chmod syscall.
	340	*/
86bc704d	341	static int posix_acl_chmod_masq(struct posix_acl *acl, umode_t mode)
1da177e4 LT	342	{
	343	struct posix_acl_entry group_obj = NULL, mask_obj = NULL;
	344	struct posix_acl_entry pa, pe;
	345
	346	/* assert(atomic_read(acl->a_refcount) == 1); */
	347
	348	FOREACH_ACL_ENTRY(pa, acl, pe) {
	349	switch(pa->e_tag) {
	350	case ACL_USER_OBJ:
	351	pa->e_perm = (mode & S_IRWXU) >> 6;
	352	break;
	353
	354	case ACL_USER:
	355	case ACL_GROUP:
	356	break;
	357
	358	case ACL_GROUP_OBJ:
	359	group_obj = pa;
	360	break;
	361
	362	case ACL_MASK:
	363	mask_obj = pa;
	364	break;
	365
	366	case ACL_OTHER:
	367	pa->e_perm = (mode & S_IRWXO);
	368	break;
	369
	370	default:
	371	return -EIO;
	372	}
	373	}
	374
	375	if (mask_obj) {
	376	mask_obj->e_perm = (mode & S_IRWXG) >> 3;
	377	} else {
	378	if (!group_obj)
	379	return -EIO;
	380	group_obj->e_perm = (mode & S_IRWXG) >> 3;
	381	}
	382
	383	return 0;
	384	}
bc26ab5f	385
826cae2f	386	int
d3fb6120	387	posix_acl_create(struct posix_acl *acl, gfp_t gfp, umode_t mode_p)
826cae2f AV	388	{
	389	struct posix_acl clone = posix_acl_clone(acl, gfp);
	390	int err = -ENOMEM;
	391	if (clone) {
	392	err = posix_acl_create_masq(clone, mode_p);
	393	if (err < 0) {
	394	posix_acl_release(clone);
	395	clone = NULL;
	396	}
	397	}
	398	posix_acl_release(*acl);
	399	*acl = clone;
	400	return err;
	401	}
	402	EXPORT_SYMBOL(posix_acl_create);
	403
bc26ab5f	404	int
86bc704d	405	posix_acl_chmod(struct posix_acl **acl, gfp_t gfp, umode_t mode)
bc26ab5f AV	406	{
	407	struct posix_acl clone = posix_acl_clone(acl, gfp);
	408	int err = -ENOMEM;
	409	if (clone) {
	410	err = posix_acl_chmod_masq(clone, mode);
	411	if (err) {
	412	posix_acl_release(clone);
	413	clone = NULL;
	414	}
	415	}
	416	posix_acl_release(*acl);
	417	*acl = clone;
	418	return err;
	419	}
	420	EXPORT_SYMBOL(posix_acl_chmod);