[linux.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/fs.h>
#include <linux/quotaops.h>
#include <linux/posix_acl_xattr.h>
#include "jfs_incore.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;
	struct jfs_inode_info *ji = JFS_IP(inode);
	struct posix_acl **p_acl;
	int size;
	char *value = NULL;

	switch(type) {
		case ACL_TYPE_ACCESS:
			ea_name = POSIX_ACL_XATTR_ACCESS;
			p_acl = &ji->i_acl;
			break;
		case ACL_TYPE_DEFAULT:
			ea_name = POSIX_ACL_XATTR_DEFAULT;
			p_acl = &ji->i_default_acl;
			break;
		default:
			return ERR_PTR(-EINVAL);
	}

	if (*p_acl != JFS_ACL_NOT_CACHED)
		return posix_acl_dup(*p_acl);

	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) {
			*p_acl = NULL;
			acl = NULL;
		} else
			acl = ERR_PTR(size);
	} else {
		acl = posix_acl_from_xattr(value, size);
		if (!IS_ERR(acl))
			*p_acl = posix_acl_dup(acl);
	}
	kfree(value);
	return acl;
}

static int jfs_set_acl(struct inode *inode, int type, struct posix_acl *acl)
{
	char *ea_name;
	struct jfs_inode_info *ji = JFS_IP(inode);
	struct posix_acl **p_acl;
	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;
			p_acl = &ji->i_acl;
			break;
		case ACL_TYPE_DEFAULT:
			ea_name = POSIX_ACL_XATTR_DEFAULT;
			p_acl = &ji->i_default_acl;
			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(inode, ea_name, value, size, 0);
out:
	kfree(value);

	if (!rc) {
		if (*p_acl && (*p_acl != JFS_ACL_NOT_CACHED))
			posix_acl_release(*p_acl);
		*p_acl = posix_acl_dup(acl);
	}
	return rc;
}

static int jfs_check_acl(struct inode *inode, int mask)
{
	struct jfs_inode_info *ji = JFS_IP(inode);

	if (ji->i_acl == JFS_ACL_NOT_CACHED) {
		struct posix_acl *acl = jfs_get_acl(inode, ACL_TYPE_ACCESS);
		if (IS_ERR(acl))
			return PTR_ERR(acl);
		posix_acl_release(acl);
	}

	if (ji->i_acl)
		return posix_acl_permission(inode, ji->i_acl, mask);
	return -EAGAIN;
}

int jfs_permission(struct inode *inode, int mask, struct nameidata *nd)
{
	return generic_permission(inode, mask, jfs_check_acl);
}

int jfs_init_acl(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(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(inode, ACL_TYPE_ACCESS, clone);
		}
		posix_acl_release(clone);
cleanup:
		posix_acl_release(acl);
	} else
		inode->i_mode &= ~current->fs->umask;

	return rc;
}

static 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)
		rc = jfs_set_acl(inode, ACL_TYPE_ACCESS, clone);

	posix_acl_release(clone);
	return rc;
}

int jfs_setattr(struct dentry *dentry, struct iattr *iattr)
{
	struct inode *inode = dentry->d_inode;
	int rc;

	rc = inode_change_ok(inode, iattr);
	if (rc)
		return rc;

	if ((iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) ||
	    (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid)) {
		if (DQUOT_TRANSFER(inode, iattr))
			return -EDQUOT;
	}

	rc = inode_setattr(inode, iattr);

	if (!rc && (iattr->ia_valid & ATTR_MODE))
		rc = jfs_acl_chmod(inode);

	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
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	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
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	19	*/
	20
	21	#include <linux/sched.h>
	22	#include <linux/fs.h>
	23	#include <linux/quotaops.h>
9a59f452	24	#include <linux/posix_acl_xattr.h>
1da177e4 LT	25	#include "jfs_incore.h"
	26	#include "jfs_xattr.h"
	27	#include "jfs_acl.h"
	28
	29	static struct posix_acl jfs_get_acl(struct inode inode, int type)
	30	{
	31	struct posix_acl *acl;
	32	char *ea_name;
	33	struct jfs_inode_info *ji = JFS_IP(inode);
	34	struct posix_acl **p_acl;
	35	int size;
	36	char *value = NULL;
	37
	38	switch(type) {
	39	case ACL_TYPE_ACCESS:
9a59f452	40	ea_name = POSIX_ACL_XATTR_ACCESS;
1da177e4 LT	41	p_acl = &ji->i_acl;
	42	break;
	43	case ACL_TYPE_DEFAULT:
9a59f452	44	ea_name = POSIX_ACL_XATTR_DEFAULT;
1da177e4 LT	45	p_acl = &ji->i_default_acl;
	46	break;
	47	default:
	48	return ERR_PTR(-EINVAL);
	49	}
	50
	51	if (*p_acl != JFS_ACL_NOT_CACHED)
	52	return posix_acl_dup(*p_acl);
	53
	54	size = __jfs_getxattr(inode, ea_name, NULL, 0);
	55
	56	if (size > 0) {
	57	value = kmalloc(size, GFP_KERNEL);
	58	if (!value)
	59	return ERR_PTR(-ENOMEM);
	60	size = __jfs_getxattr(inode, ea_name, value, size);
	61	}
	62
	63	if (size < 0) {
	64	if (size == -ENODATA) {
	65	*p_acl = NULL;
	66	acl = NULL;
	67	} else
	68	acl = ERR_PTR(size);
	69	} else {
	70	acl = posix_acl_from_xattr(value, size);
	71	if (!IS_ERR(acl))
	72	*p_acl = posix_acl_dup(acl);
	73	}
259692bd	74	kfree(value);
1da177e4 LT	75	return acl;
	76	}
	77
	78	static int jfs_set_acl(struct inode inode, int type, struct posix_acl acl)
	79	{
	80	char *ea_name;
	81	struct jfs_inode_info *ji = JFS_IP(inode);
	82	struct posix_acl **p_acl;
	83	int rc;
	84	int size = 0;
	85	char *value = NULL;
	86
	87	if (S_ISLNK(inode->i_mode))
	88	return -EOPNOTSUPP;
	89
	90	switch(type) {
	91	case ACL_TYPE_ACCESS:
9a59f452	92	ea_name = POSIX_ACL_XATTR_ACCESS;
1da177e4 LT	93	p_acl = &ji->i_acl;
	94	break;
	95	case ACL_TYPE_DEFAULT:
9a59f452	96	ea_name = POSIX_ACL_XATTR_DEFAULT;
1da177e4 LT	97	p_acl = &ji->i_default_acl;
	98	if (!S_ISDIR(inode->i_mode))
	99	return acl ? -EACCES : 0;
	100	break;
	101	default:
	102	return -EINVAL;
	103	}
	104	if (acl) {
9a59f452	105	size = posix_acl_xattr_size(acl->a_count);
1da177e4 LT	106	value = kmalloc(size, GFP_KERNEL);
	107	if (!value)
	108	return -ENOMEM;
	109	rc = posix_acl_to_xattr(acl, value, size);
	110	if (rc < 0)
	111	goto out;
	112	}
	113	rc = __jfs_setxattr(inode, ea_name, value, size, 0);
	114	out:
259692bd	115	kfree(value);
1da177e4 LT	116
	117	if (!rc) {
	118	if (p_acl && (p_acl != JFS_ACL_NOT_CACHED))
	119	posix_acl_release(*p_acl);
	120	*p_acl = posix_acl_dup(acl);
	121	}
	122	return rc;
	123	}
	124
	125	static int jfs_check_acl(struct inode *inode, int mask)
	126	{
	127	struct jfs_inode_info *ji = JFS_IP(inode);
	128
	129	if (ji->i_acl == JFS_ACL_NOT_CACHED) {
	130	struct posix_acl *acl = jfs_get_acl(inode, ACL_TYPE_ACCESS);
	131	if (IS_ERR(acl))
	132	return PTR_ERR(acl);
	133	posix_acl_release(acl);
	134	}
	135
	136	if (ji->i_acl)
	137	return posix_acl_permission(inode, ji->i_acl, mask);
	138	return -EAGAIN;
	139	}
	140
	141	int jfs_permission(struct inode inode, int mask, struct nameidata nd)
	142	{
	143	return generic_permission(inode, mask, jfs_check_acl);
	144	}
	145
	146	int jfs_init_acl(struct inode inode, struct inode dir)
	147	{
	148	struct posix_acl *acl = NULL;
	149	struct posix_acl *clone;
	150	mode_t mode;
	151	int rc = 0;
	152
	153	if (S_ISLNK(inode->i_mode))
	154	return 0;
	155
	156	acl = jfs_get_acl(dir, ACL_TYPE_DEFAULT);
	157	if (IS_ERR(acl))
	158	return PTR_ERR(acl);
	159
	160	if (acl) {
	161	if (S_ISDIR(inode->i_mode)) {
	162	rc = jfs_set_acl(inode, ACL_TYPE_DEFAULT, acl);
	163	if (rc)
	164	goto cleanup;
	165	}
	166	clone = posix_acl_clone(acl, GFP_KERNEL);
	167	if (!clone) {
	168	rc = -ENOMEM;
	169	goto cleanup;
	170	}
	171	mode = inode->i_mode;
	172	rc = posix_acl_create_masq(clone, &mode);
	173	if (rc >= 0) {
	174	inode->i_mode = mode;
	175	if (rc > 0)
	176	rc = jfs_set_acl(inode, ACL_TYPE_ACCESS, clone);
	177	}
	178	posix_acl_release(clone);
	179	cleanup:
180	posix_acl_release(acl);
181	} else
182	inode->i_mode &= ~current->fs->umask;
183
184	return rc;
185	}
186
187	static int jfs_acl_chmod(struct inode *inode)
188	{
189	struct posix_acl acl, clone;
190	int rc;
191
192	if (S_ISLNK(inode->i_mode))
193	return -EOPNOTSUPP;
194
195	acl = jfs_get_acl(inode, ACL_TYPE_ACCESS);
196	if (IS_ERR(acl) \|\| !acl)
197	return PTR_ERR(acl);
198
199	clone = posix_acl_clone(acl, GFP_KERNEL);
200	posix_acl_release(acl);
201	if (!clone)
202	return -ENOMEM;
203
204	rc = posix_acl_chmod_masq(clone, inode->i_mode);
205	if (!rc)
206	rc = jfs_set_acl(inode, ACL_TYPE_ACCESS, clone);
207
208	posix_acl_release(clone);
209	return rc;
210	}
211
212	int jfs_setattr(struct dentry dentry, struct iattr iattr)
213	{
214	struct inode *inode = dentry->d_inode;
215	int rc;
216
217	rc = inode_change_ok(inode, iattr);
218	if (rc)
219	return rc;
220
221	if ((iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) \|\|
222	(iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid)) {
223	if (DQUOT_TRANSFER(inode, iattr))
224	return -EDQUOT;
225	}
226
227	rc = inode_setattr(inode, iattr);
228
229	if (!rc && (iattr->ia_valid & ATTR_MODE))
230	rc = jfs_acl_chmod(inode);
231
232	return rc;
233	}