[linux-2.6-block.git] / fs / gfs2 / acl.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
 */

#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/xattr.h>
#include <linux/posix_acl.h>
#include <linux/posix_acl_xattr.h>
#include <linux/gfs2_ondisk.h>

#include "gfs2.h"
#include "incore.h"
#include "acl.h"
#include "xattr.h"
#include "glock.h"
#include "inode.h"
#include "meta_io.h"
#include "rgrp.h"
#include "trans.h"
#include "util.h"

static const char *gfs2_acl_name(int type)
{
	switch (type) {
	case ACL_TYPE_ACCESS:
		return XATTR_POSIX_ACL_ACCESS;
	case ACL_TYPE_DEFAULT:
		return XATTR_POSIX_ACL_DEFAULT;
	}
	return NULL;
}

static struct posix_acl *__gfs2_get_acl(struct inode *inode, int type)
{
	struct gfs2_inode *ip = GFS2_I(inode);
	struct posix_acl *acl;
	const char *name;
	char *data;
	int len;

	if (!ip->i_eattr)
		return NULL;

	name = gfs2_acl_name(type);
	len = gfs2_xattr_acl_get(ip, name, &data);
	if (len <= 0)
		return ERR_PTR(len);
	acl = posix_acl_from_xattr(&init_user_ns, data, len);
	kfree(data);
	return acl;
}

struct posix_acl *gfs2_get_acl(struct inode *inode, int type)
{
	struct gfs2_inode *ip = GFS2_I(inode);
	struct gfs2_holder gh;
	bool need_unlock = false;
	struct posix_acl *acl;

	if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
		int ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
					     LM_FLAG_ANY, &gh);
		if (ret)
			return ERR_PTR(ret);
		need_unlock = true;
	}
	acl = __gfs2_get_acl(inode, type);
	if (need_unlock)
		gfs2_glock_dq_uninit(&gh);
	return acl;
}

int __gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
{
	int error;
	size_t len;
	char *data;
	const char *name = gfs2_acl_name(type);

	if (acl) {
		len = posix_acl_xattr_size(acl->a_count);
		data = kmalloc(len, GFP_NOFS);
		if (data == NULL)
			return -ENOMEM;
		error = posix_acl_to_xattr(&init_user_ns, acl, data, len);
		if (error < 0)
			goto out;
	} else {
		data = NULL;
		len = 0;
	}

	error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS);
	if (error)
		goto out;
	set_cached_acl(inode, type, acl);
out:
	kfree(data);
	return error;
}

int gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
{
	struct gfs2_inode *ip = GFS2_I(inode);
	struct gfs2_holder gh;
	bool need_unlock = false;
	int ret;
	umode_t mode;

	if (acl && acl->a_count > GFS2_ACL_MAX_ENTRIES(GFS2_SB(inode)))
		return -E2BIG;

	ret = gfs2_rsqa_alloc(ip);
	if (ret)
		return ret;

	if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
		ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
		if (ret)
			return ret;
		need_unlock = true;
	}

	mode = inode->i_mode;
	if (type == ACL_TYPE_ACCESS && acl) {
		ret = posix_acl_update_mode(inode, &mode, &acl);
		if (ret)
			goto unlock;
	}

	ret = __gfs2_set_acl(inode, acl, type);
	if (!ret && mode != inode->i_mode) {
		inode->i_ctime = current_time(inode);
		inode->i_mode = mode;
		mark_inode_dirty(inode);
	}
unlock:
	if (need_unlock)
		gfs2_glock_dq_uninit(&gh);
	return ret;
}
Commit	Line	Data
7336d0e6	1	// SPDX-License-Identifier: GPL-2.0-only
b3b94faa DT	2	/*
b3b94faa DT	3	* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3a8a9a10	4	* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
b3b94faa DT	5	*/
	6
	7	#include <linux/sched.h>
	8	#include <linux/slab.h>
	9	#include <linux/spinlock.h>
	10	#include <linux/completion.h>
	11	#include <linux/buffer_head.h>
2646a1f6	12	#include <linux/xattr.h>
b3b94faa DT	13	#include <linux/posix_acl.h>
b3b94faa DT	14	#include <linux/posix_acl_xattr.h>
5c676f6d	15	#include <linux/gfs2_ondisk.h>
b3b94faa DT	16
b3b94faa DT	17	#include "gfs2.h"
5c676f6d	18	#include "incore.h"
b3b94faa	19	#include "acl.h"
307cf6e6	20	#include "xattr.h"
b3b94faa DT	21	#include "glock.h"
	22	#include "inode.h"
	23	#include "meta_io.h"
1a39ba99	24	#include "rgrp.h"
b3b94faa	25	#include "trans.h"
5c676f6d	26	#include "util.h"
b3b94faa	27
479c427d	28	static const char *gfs2_acl_name(int type)
b3b94faa	29	{
479c427d SW	30	switch (type) {
479c427d SW	31	case ACL_TYPE_ACCESS:
97d79299	32	return XATTR_POSIX_ACL_ACCESS;
479c427d	33	case ACL_TYPE_DEFAULT:
97d79299	34	return XATTR_POSIX_ACL_DEFAULT;
479c427d SW	35	}
	36	return NULL;
	37	}
b3b94faa	38
1a39ba99	39	static struct posix_acl __gfs2_get_acl(struct inode inode, int type)
479c427d	40	{
018a01cd	41	struct gfs2_inode *ip = GFS2_I(inode);
479c427d SW	42	struct posix_acl *acl;
	43	const char *name;
	44	char *data;
	45	int len;
40b78a32	46
3767ac21	47	if (!ip->i_eattr)
479c427d	48	return NULL;
b3b94faa	49
479c427d	50	name = gfs2_acl_name(type);
479c427d	51	len = gfs2_xattr_acl_get(ip, name, &data);
1a39ba99	52	if (len <= 0)
479c427d	53	return ERR_PTR(len);
5f3a4a28	54	acl = posix_acl_from_xattr(&init_user_ns, data, len);
479c427d SW	55	kfree(data);
479c427d SW	56	return acl;
b3b94faa DT	57	}
b3b94faa DT	58
1a39ba99 AV	59	struct posix_acl gfs2_get_acl(struct inode inode, int type)
	60	{
	61	struct gfs2_inode *ip = GFS2_I(inode);
	62	struct gfs2_holder gh;
	63	bool need_unlock = false;
	64	struct posix_acl *acl;
	65
	66	if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
	67	int ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
	68	LM_FLAG_ANY, &gh);
	69	if (ret)
	70	return ERR_PTR(ret);
	71	need_unlock = true;
	72	}
	73	acl = __gfs2_get_acl(inode, type);
	74	if (need_unlock)
	75	gfs2_glock_dq_uninit(&gh);
	76	return acl;
	77	}
	78
	79	int __gfs2_set_acl(struct inode inode, struct posix_acl acl, int type)
b3b94faa	80	{
b3b94faa	81	int error;
910f3d58	82	size_t len;
479c427d SW	83	char *data;
	84	const char *name = gfs2_acl_name(type);
	85
e01580bf	86	if (acl) {
910f3d58	87	len = posix_acl_xattr_size(acl->a_count);
e01580bf CH	88	data = kmalloc(len, GFP_NOFS);
	89	if (data == NULL)
	90	return -ENOMEM;
	91	error = posix_acl_to_xattr(&init_user_ns, acl, data, len);
	92	if (error < 0)
	93	goto out;
	94	} else {
	95	data = NULL;
	96	len = 0;
106381bf	97	}
e01580bf CH	98
	99	error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS);
	100	if (error)
	101	goto out;
932e468a	102	set_cached_acl(inode, type, acl);
2646a1f6	103	out:
e01580bf	104	kfree(data);
2646a1f6 SW	105	return error;
2646a1f6 SW	106	}
1a39ba99 AV	107
	108	int gfs2_set_acl(struct inode inode, struct posix_acl acl, int type)
	109	{
	110	struct gfs2_inode *ip = GFS2_I(inode);
	111	struct gfs2_holder gh;
	112	bool need_unlock = false;
	113	int ret;
309e8cda	114	umode_t mode;
1a39ba99	115
914cea93 JK	116	if (acl && acl->a_count > GFS2_ACL_MAX_ENTRIES(GFS2_SB(inode)))
	117	return -E2BIG;
	118
1a39ba99 AV	119	ret = gfs2_rsqa_alloc(ip);
	120	if (ret)
	121	return ret;
	122
	123	if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
	124	ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
	125	if (ret)
	126	return ret;
	127	need_unlock = true;
	128	}
914cea93	129
309e8cda EF	130	mode = inode->i_mode;
	131	if (type == ACL_TYPE_ACCESS && acl) {
	132	ret = posix_acl_update_mode(inode, &mode, &acl);
914cea93 JK	133	if (ret)
914cea93 JK	134	goto unlock;
914cea93 JK	135	}
914cea93 JK	136
1a39ba99	137	ret = __gfs2_set_acl(inode, acl, type);
309e8cda	138	if (!ret && mode != inode->i_mode) {
c2c4be28	139	inode->i_ctime = current_time(inode);
309e8cda EF	140	inode->i_mode = mode;
	141	mark_inode_dirty(inode);
	142	}
914cea93	143	unlock:
1a39ba99 AV	144	if (need_unlock)
	145	gfs2_glock_dq_uninit(&gh);
	146	return ret;
	147	}