[mirror_ubuntu-artful-kernel.git] / fs / jfs / acl.c

/*
 *   Copyright (C) International Business Machines  Corp., 2002-2004
 *   Copyright (C) Andreas Gruenbacher, 2001
 *   Copyright (C) Linus Torvalds, 1991, 1992
 *
 *   This program is free software;  you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program;  if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/posix_acl_xattr.h>
#include "jfs_incore.h"
#include "jfs_txnmgr.h"
#include "jfs_xattr.h"
#include "jfs_acl.h"

struct posix_acl *jfs_get_acl(struct inode *inode, int type)
{
	struct posix_acl *acl;
	char *ea_name;
	int size;
	char *value = NULL;

	switch(type) {
		case ACL_TYPE_ACCESS:
			ea_name = XATTR_NAME_POSIX_ACL_ACCESS;
			break;
		case ACL_TYPE_DEFAULT:
			ea_name = XATTR_NAME_POSIX_ACL_DEFAULT;
			break;
		default:
			return ERR_PTR(-EINVAL);
	}

	size = __jfs_getxattr(inode, ea_name, NULL, 0);

	if (size > 0) {
		value = kmalloc(size, GFP_KERNEL);
		if (!value)
			return ERR_PTR(-ENOMEM);
		size = __jfs_getxattr(inode, ea_name, value, size);
	}

	if (size < 0) {
		if (size == -ENODATA)
			acl = NULL;
		else
			acl = ERR_PTR(size);
	} else {
		acl = posix_acl_from_xattr(&init_user_ns, value, size);
	}
	kfree(value);
	return acl;
}

static int __jfs_set_acl(tid_t tid, struct inode *inode, int type,
		       struct posix_acl *acl)
{
	char *ea_name;
	int rc;
	int size = 0;
	char *value = NULL;

	switch (type) {
	case ACL_TYPE_ACCESS:
		ea_name = XATTR_NAME_POSIX_ACL_ACCESS;
		if (acl) {
			rc = posix_acl_update_mode(inode, &inode->i_mode, &acl);
			if (rc)
				return rc;
			inode->i_ctime = current_time(inode);
			mark_inode_dirty(inode);
		}
		break;
	case ACL_TYPE_DEFAULT:
		ea_name = XATTR_NAME_POSIX_ACL_DEFAULT;
		break;
	default:
		return -EINVAL;
	}

	if (acl) {
		size = posix_acl_xattr_size(acl->a_count);
		value = kmalloc(size, GFP_KERNEL);
		if (!value)
			return -ENOMEM;
		rc = posix_acl_to_xattr(&init_user_ns, acl, value, size);
		if (rc < 0)
			goto out;
	}
	rc = __jfs_setxattr(tid, inode, ea_name, value, size, 0);
out:
	kfree(value);

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

	return rc;
}

int jfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
{
	int rc;
	tid_t tid;

	tid = txBegin(inode->i_sb, 0);
	mutex_lock(&JFS_IP(inode)->commit_mutex);
	rc = __jfs_set_acl(tid, inode, type, acl);
	if (!rc)
		rc = txCommit(tid, 1, &inode, 0);
	txEnd(tid);
	mutex_unlock(&JFS_IP(inode)->commit_mutex);
	return rc;
}

int jfs_init_acl(tid_t tid, struct inode *inode, struct inode *dir)
{
	struct posix_acl *default_acl, *acl;
	int rc = 0;

	rc = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
	if (rc)
		return rc;

	if (default_acl) {
		rc = __jfs_set_acl(tid, inode, ACL_TYPE_DEFAULT, default_acl);
		posix_acl_release(default_acl);
	}

	if (acl) {
		if (!rc)
			rc = __jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, acl);
		posix_acl_release(acl);
	}

	JFS_IP(inode)->mode2 = (JFS_IP(inode)->mode2 & 0xffff0000) |
			       inode->i_mode;

	return rc;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Copyright (C) International Business Machines Corp., 2002-2004
	3	* Copyright (C) Andreas Gruenbacher, 2001
	4	* Copyright (C) Linus Torvalds, 1991, 1992
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
63f83c9f	8	* the Free Software Foundation; either version 2 of the License, or
1da177e4	9	* (at your option) any later version.
63f83c9f	10	*
1da177e4 LT	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
	14	* the GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
63f83c9f	17	* along with this program; if not, write to the Free Software
1da177e4 LT	18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	19	*/
	20
	21	#include <linux/sched.h>
5a0e3ad6	22	#include <linux/slab.h>
1da177e4	23	#include <linux/fs.h>
9a59f452	24	#include <linux/posix_acl_xattr.h>
1da177e4	25	#include "jfs_incore.h"
4f4b401b	26	#include "jfs_txnmgr.h"
1da177e4 LT	27	#include "jfs_xattr.h"
	28	#include "jfs_acl.h"
	29
4e34e719	30	struct posix_acl jfs_get_acl(struct inode inode, int type)
1da177e4 LT	31	{
	32	struct posix_acl *acl;
	33	char *ea_name;
1da177e4 LT	34	int size;
	35	char *value = NULL;
	36
	37	switch(type) {
	38	case ACL_TYPE_ACCESS:
97d79299	39	ea_name = XATTR_NAME_POSIX_ACL_ACCESS;
1da177e4 LT	40	break;
1da177e4 LT	41	case ACL_TYPE_DEFAULT:
97d79299	42	ea_name = XATTR_NAME_POSIX_ACL_DEFAULT;
1da177e4 LT	43	break;
	44	default:
	45	return ERR_PTR(-EINVAL);
	46	}
	47
1da177e4 LT	48	size = __jfs_getxattr(inode, ea_name, NULL, 0);
	49
	50	if (size > 0) {
	51	value = kmalloc(size, GFP_KERNEL);
	52	if (!value)
	53	return ERR_PTR(-ENOMEM);
	54	size = __jfs_getxattr(inode, ea_name, value, size);
	55	}
	56
	57	if (size < 0) {
073aaa1b	58	if (size == -ENODATA)
1da177e4	59	acl = NULL;
073aaa1b	60	else
1da177e4 LT	61	acl = ERR_PTR(size);
1da177e4 LT	62	} else {
5f3a4a28	63	acl = posix_acl_from_xattr(&init_user_ns, value, size);
1da177e4	64	}
259692bd	65	kfree(value);
1da177e4 LT	66	return acl;
	67	}
	68
2cc6a5a0	69	static int __jfs_set_acl(tid_t tid, struct inode *inode, int type,
4f4b401b	70	struct posix_acl *acl)
1da177e4 LT	71	{
1da177e4 LT	72	char *ea_name;
1da177e4 LT	73	int rc;
	74	int size = 0;
	75	char *value = NULL;
	76
2cc6a5a0 CH	77	switch (type) {
2cc6a5a0 CH	78	case ACL_TYPE_ACCESS:
97d79299	79	ea_name = XATTR_NAME_POSIX_ACL_ACCESS;
e31da3f9	80	if (acl) {
07393101 JK	81	rc = posix_acl_update_mode(inode, &inode->i_mode, &acl);
07393101 JK	82	if (rc)
e31da3f9	83	return rc;
078cd827	84	inode->i_ctime = current_time(inode);
e31da3f9	85	mark_inode_dirty(inode);
e31da3f9	86	}
2cc6a5a0 CH	87	break;
2cc6a5a0 CH	88	case ACL_TYPE_DEFAULT:
97d79299	89	ea_name = XATTR_NAME_POSIX_ACL_DEFAULT;
2cc6a5a0 CH	90	break;
	91	default:
	92	return -EINVAL;
1da177e4	93	}
2cc6a5a0	94
1da177e4	95	if (acl) {
9a59f452	96	size = posix_acl_xattr_size(acl->a_count);
1da177e4 LT	97	value = kmalloc(size, GFP_KERNEL);
	98	if (!value)
	99	return -ENOMEM;
5f3a4a28	100	rc = posix_acl_to_xattr(&init_user_ns, acl, value, size);
1da177e4 LT	101	if (rc < 0)
	102	goto out;
	103	}
4f4b401b	104	rc = __jfs_setxattr(tid, inode, ea_name, value, size, 0);
1da177e4	105	out:
259692bd	106	kfree(value);
1da177e4	107
073aaa1b AV	108	if (!rc)
	109	set_cached_acl(inode, type, acl);
	110
1da177e4 LT	111	return rc;
	112	}
	113
2cc6a5a0 CH	114	int jfs_set_acl(struct inode inode, struct posix_acl acl, int type)
	115	{
	116	int rc;
	117	tid_t tid;
	118
	119	tid = txBegin(inode->i_sb, 0);
	120	mutex_lock(&JFS_IP(inode)->commit_mutex);
	121	rc = __jfs_set_acl(tid, inode, type, acl);
	122	if (!rc)
	123	rc = txCommit(tid, 1, &inode, 0);
	124	txEnd(tid);
	125	mutex_unlock(&JFS_IP(inode)->commit_mutex);
	126	return rc;
	127	}
	128
4f4b401b	129	int jfs_init_acl(tid_t tid, struct inode inode, struct inode dir)
1da177e4	130	{
2cc6a5a0	131	struct posix_acl default_acl, acl;
1da177e4 LT	132	int rc = 0;
1da177e4 LT	133
2cc6a5a0 CH	134	rc = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
	135	if (rc)
	136	return rc;
1da177e4	137
2cc6a5a0 CH	138	if (default_acl) {
	139	rc = __jfs_set_acl(tid, inode, ACL_TYPE_DEFAULT, default_acl);
	140	posix_acl_release(default_acl);
	141	}
1da177e4 LT	142
1da177e4 LT	143	if (acl) {
2cc6a5a0 CH	144	if (!rc)
2cc6a5a0 CH	145	rc = __jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, acl);
1da177e4	146	posix_acl_release(acl);
2cc6a5a0	147	}
63f83c9f	148
69eb66d7 DK	149	JFS_IP(inode)->mode2 = (JFS_IP(inode)->mode2 & 0xffff0000) \|
69eb66d7 DK	150	inode->i_mode;
1da177e4 LT	151
	152	return rc;
	153	}