[net-next-2.6.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"

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

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

	switch(type) {
		case ACL_TYPE_ACCESS:
			ea_name = POSIX_ACL_XATTR_ACCESS;
			break;
		case ACL_TYPE_DEFAULT:
			ea_name = POSIX_ACL_XATTR_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(value, size);
	}
	kfree(value);
	if (!IS_ERR(acl))
		set_cached_acl(inode, type, acl);
	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;

	if (S_ISLNK(inode->i_mode))
		return -EOPNOTSUPP;

	switch(type) {
		case ACL_TYPE_ACCESS:
			ea_name = POSIX_ACL_XATTR_ACCESS;
			break;
		case ACL_TYPE_DEFAULT:
			ea_name = POSIX_ACL_XATTR_DEFAULT;
			if (!S_ISDIR(inode->i_mode))
				return acl ? -EACCES : 0;
			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(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_check_acl(struct inode *inode, int mask)
{
	struct posix_acl *acl = jfs_get_acl(inode, ACL_TYPE_ACCESS);

	if (IS_ERR(acl))
		return PTR_ERR(acl);
	if (acl) {
		int error = posix_acl_permission(inode, acl, mask);
		posix_acl_release(acl);
		return error;
	}

	return -EAGAIN;
}

int jfs_init_acl(tid_t tid, struct inode *inode, struct inode *dir)
{
	struct posix_acl *acl = NULL;
	struct posix_acl *clone;
	mode_t mode;
	int rc = 0;

	if (S_ISLNK(inode->i_mode))
		return 0;

	acl = jfs_get_acl(dir, ACL_TYPE_DEFAULT);
	if (IS_ERR(acl))
		return PTR_ERR(acl);

	if (acl) {
		if (S_ISDIR(inode->i_mode)) {
			rc = jfs_set_acl(tid, inode, ACL_TYPE_DEFAULT, acl);
			if (rc)
				goto cleanup;
		}
		clone = posix_acl_clone(acl, GFP_KERNEL);
		if (!clone) {
			rc = -ENOMEM;
			goto cleanup;
		}
		mode = inode->i_mode;
		rc = posix_acl_create_masq(clone, &mode);
		if (rc >= 0) {
			inode->i_mode = mode;
			if (rc > 0)
				rc = jfs_set_acl(tid, inode, ACL_TYPE_ACCESS,
						 clone);
		}
		posix_acl_release(clone);
cleanup:
		posix_acl_release(acl);
	} else
		inode->i_mode &= ~current_umask();

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

	return rc;
}

int jfs_acl_chmod(struct inode *inode)
{
	struct posix_acl *acl, *clone;
	int rc;

	if (S_ISLNK(inode->i_mode))
		return -EOPNOTSUPP;

	acl = jfs_get_acl(inode, ACL_TYPE_ACCESS);
	if (IS_ERR(acl) || !acl)
		return PTR_ERR(acl);

	clone = posix_acl_clone(acl, GFP_KERNEL);
	posix_acl_release(acl);
	if (!clone)
		return -ENOMEM;

	rc = posix_acl_chmod_masq(clone, inode->i_mode);
	if (!rc) {
		tid_t tid = txBegin(inode->i_sb, 0);
		mutex_lock(&JFS_IP(inode)->commit_mutex);
		rc = jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, clone);
		if (!rc)
			rc = txCommit(tid, 1, &inode, 0);
		txEnd(tid);
		mutex_unlock(&JFS_IP(inode)->commit_mutex);
	}

	posix_acl_release(clone);
	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
	30	static struct posix_acl jfs_get_acl(struct inode inode, int type)
	31	{
	32	struct posix_acl *acl;
	33	char *ea_name;
1da177e4 LT	34	int size;
	35	char *value = NULL;
	36
073aaa1b AV	37	acl = get_cached_acl(inode, type);
	38	if (acl != ACL_NOT_CACHED)
	39	return acl;
	40
1da177e4 LT	41	switch(type) {
1da177e4 LT	42	case ACL_TYPE_ACCESS:
9a59f452	43	ea_name = POSIX_ACL_XATTR_ACCESS;
1da177e4 LT	44	break;
1da177e4 LT	45	case ACL_TYPE_DEFAULT:
9a59f452	46	ea_name = POSIX_ACL_XATTR_DEFAULT;
1da177e4 LT	47	break;
	48	default:
	49	return ERR_PTR(-EINVAL);
	50	}
	51
1da177e4 LT	52	size = __jfs_getxattr(inode, ea_name, NULL, 0);
	53
	54	if (size > 0) {
	55	value = kmalloc(size, GFP_KERNEL);
	56	if (!value)
	57	return ERR_PTR(-ENOMEM);
	58	size = __jfs_getxattr(inode, ea_name, value, size);
	59	}
	60
	61	if (size < 0) {
073aaa1b	62	if (size == -ENODATA)
1da177e4	63	acl = NULL;
073aaa1b	64	else
1da177e4 LT	65	acl = ERR_PTR(size);
	66	} else {
	67	acl = posix_acl_from_xattr(value, size);
1da177e4	68	}
259692bd	69	kfree(value);
4a19fb11	70	if (!IS_ERR(acl))
073aaa1b	71	set_cached_acl(inode, type, acl);
1da177e4 LT	72	return acl;
	73	}
	74
4f4b401b DK	75	static int jfs_set_acl(tid_t tid, struct inode *inode, int type,
4f4b401b DK	76	struct posix_acl *acl)
1da177e4 LT	77	{
1da177e4 LT	78	char *ea_name;
1da177e4 LT	79	int rc;
	80	int size = 0;
	81	char *value = NULL;
	82
	83	if (S_ISLNK(inode->i_mode))
	84	return -EOPNOTSUPP;
	85
	86	switch(type) {
	87	case ACL_TYPE_ACCESS:
9a59f452	88	ea_name = POSIX_ACL_XATTR_ACCESS;
1da177e4 LT	89	break;
1da177e4 LT	90	case ACL_TYPE_DEFAULT:
9a59f452	91	ea_name = POSIX_ACL_XATTR_DEFAULT;
1da177e4 LT	92	if (!S_ISDIR(inode->i_mode))
	93	return acl ? -EACCES : 0;
	94	break;
	95	default:
	96	return -EINVAL;
	97	}
	98	if (acl) {
9a59f452	99	size = posix_acl_xattr_size(acl->a_count);
1da177e4 LT	100	value = kmalloc(size, GFP_KERNEL);
	101	if (!value)
	102	return -ENOMEM;
	103	rc = posix_acl_to_xattr(acl, value, size);
	104	if (rc < 0)
	105	goto out;
	106	}
4f4b401b	107	rc = __jfs_setxattr(tid, inode, ea_name, value, size, 0);
1da177e4	108	out:
259692bd	109	kfree(value);
1da177e4	110
073aaa1b AV	111	if (!rc)
	112	set_cached_acl(inode, type, acl);
	113
1da177e4 LT	114	return rc;
	115	}
	116
18f4c644	117	int jfs_check_acl(struct inode *inode, int mask)
1da177e4	118	{
d5bb68ad AV	119	struct posix_acl *acl = jfs_get_acl(inode, ACL_TYPE_ACCESS);
	120
	121	if (IS_ERR(acl))
	122	return PTR_ERR(acl);
	123	if (acl) {
	124	int error = posix_acl_permission(inode, acl, mask);
1da177e4	125	posix_acl_release(acl);
d5bb68ad	126	return error;
1da177e4 LT	127	}
1da177e4 LT	128
1da177e4 LT	129	return -EAGAIN;
	130	}
	131
4f4b401b	132	int jfs_init_acl(tid_t tid, struct inode inode, struct inode dir)
1da177e4 LT	133	{
	134	struct posix_acl *acl = NULL;
	135	struct posix_acl *clone;
	136	mode_t mode;
	137	int rc = 0;
	138
	139	if (S_ISLNK(inode->i_mode))
	140	return 0;
	141
	142	acl = jfs_get_acl(dir, ACL_TYPE_DEFAULT);
	143	if (IS_ERR(acl))
	144	return PTR_ERR(acl);
	145
	146	if (acl) {
	147	if (S_ISDIR(inode->i_mode)) {
4f4b401b	148	rc = jfs_set_acl(tid, inode, ACL_TYPE_DEFAULT, acl);
1da177e4 LT	149	if (rc)
	150	goto cleanup;
	151	}
	152	clone = posix_acl_clone(acl, GFP_KERNEL);
	153	if (!clone) {
	154	rc = -ENOMEM;
	155	goto cleanup;
	156	}
	157	mode = inode->i_mode;
	158	rc = posix_acl_create_masq(clone, &mode);
	159	if (rc >= 0) {
	160	inode->i_mode = mode;
	161	if (rc > 0)
4f4b401b DK	162	rc = jfs_set_acl(tid, inode, ACL_TYPE_ACCESS,
4f4b401b DK	163	clone);
1da177e4 LT	164	}
	165	posix_acl_release(clone);
	166	cleanup:
	167	posix_acl_release(acl);
	168	} else
ce3b0f8d	169	inode->i_mode &= ~current_umask();
63f83c9f	170
69eb66d7 DK	171	JFS_IP(inode)->mode2 = (JFS_IP(inode)->mode2 & 0xffff0000) \|
69eb66d7 DK	172	inode->i_mode;
1da177e4 LT	173
	174	return rc;
	175	}
	176
759bfee6	177	int jfs_acl_chmod(struct inode *inode)
1da177e4 LT	178	{
	179	struct posix_acl acl, clone;
	180	int rc;
	181
	182	if (S_ISLNK(inode->i_mode))
	183	return -EOPNOTSUPP;
	184
	185	acl = jfs_get_acl(inode, ACL_TYPE_ACCESS);
	186	if (IS_ERR(acl) \|\| !acl)
	187	return PTR_ERR(acl);
	188
	189	clone = posix_acl_clone(acl, GFP_KERNEL);
	190	posix_acl_release(acl);
	191	if (!clone)
	192	return -ENOMEM;
	193
	194	rc = posix_acl_chmod_masq(clone, inode->i_mode);
4f4b401b DK	195	if (!rc) {
4f4b401b DK	196	tid_t tid = txBegin(inode->i_sb, 0);
1de87444	197	mutex_lock(&JFS_IP(inode)->commit_mutex);
4f4b401b DK	198	rc = jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, clone);
	199	if (!rc)
	200	rc = txCommit(tid, 1, &inode, 0);
	201	txEnd(tid);
1de87444	202	mutex_unlock(&JFS_IP(inode)->commit_mutex);
4f4b401b	203	}
1da177e4 LT	204
	205	posix_acl_release(clone);
	206	return rc;
	207	}