[linux-2.6-block.git] / fs / ocfs2 / acl.c

/* -*- mode: c; c-basic-offset: 8; -*-
 * vim: noexpandtab sw=8 ts=8 sts=0:
 *
 * acl.c
 *
 * Copyright (C) 2004, 2008 Oracle.  All rights reserved.
 *
 * CREDITS:
 * Lots of code in this file is copy from linux/fs/ext3/acl.c.
 * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License version 2 as published by the Free Software Foundation.
 *
 * 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.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/string.h>

#include <cluster/masklog.h>

#include "ocfs2.h"
#include "alloc.h"
#include "dlmglue.h"
#include "file.h"
#include "inode.h"
#include "journal.h"
#include "ocfs2_fs.h"

#include "xattr.h"
#include "acl.h"

/*
 * Convert from xattr value to acl struct.
 */
static struct posix_acl *ocfs2_acl_from_xattr(const void *value, size_t size)
{
	int n, count;
	struct posix_acl *acl;

	if (!value)
		return NULL;
	if (size < sizeof(struct posix_acl_entry))
		return ERR_PTR(-EINVAL);

	count = size / sizeof(struct posix_acl_entry);

	acl = posix_acl_alloc(count, GFP_NOFS);
	if (!acl)
		return ERR_PTR(-ENOMEM);
	for (n = 0; n < count; n++) {
		struct ocfs2_acl_entry *entry =
			(struct ocfs2_acl_entry *)value;

		acl->a_entries[n].e_tag  = le16_to_cpu(entry->e_tag);
		acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm);
		switch(acl->a_entries[n].e_tag) {
		case ACL_USER:
			acl->a_entries[n].e_uid =
				make_kuid(&init_user_ns,
					  le32_to_cpu(entry->e_id));
			break;
		case ACL_GROUP:
			acl->a_entries[n].e_gid =
				make_kgid(&init_user_ns,
					  le32_to_cpu(entry->e_id));
			break;
		default:
			break;
		}
		value += sizeof(struct posix_acl_entry);

	}
	return acl;
}

/*
 * Convert acl struct to xattr value.
 */
static void *ocfs2_acl_to_xattr(const struct posix_acl *acl, size_t *size)
{
	struct ocfs2_acl_entry *entry = NULL;
	char *ocfs2_acl;
	size_t n;

	*size = acl->a_count * sizeof(struct posix_acl_entry);

	ocfs2_acl = kmalloc(*size, GFP_NOFS);
	if (!ocfs2_acl)
		return ERR_PTR(-ENOMEM);

	entry = (struct ocfs2_acl_entry *)ocfs2_acl;
	for (n = 0; n < acl->a_count; n++, entry++) {
		entry->e_tag  = cpu_to_le16(acl->a_entries[n].e_tag);
		entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm);
		switch(acl->a_entries[n].e_tag) {
		case ACL_USER:
			entry->e_id = cpu_to_le32(
				from_kuid(&init_user_ns,
					  acl->a_entries[n].e_uid));
			break;
		case ACL_GROUP:
			entry->e_id = cpu_to_le32(
				from_kgid(&init_user_ns,
					  acl->a_entries[n].e_gid));
			break;
		default:
			entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID);
			break;
		}
	}
	return ocfs2_acl;
}

static struct posix_acl *ocfs2_get_acl_nolock(struct inode *inode,
					      int type,
					      struct buffer_head *di_bh)
{
	int name_index;
	char *value = NULL;
	struct posix_acl *acl;
	int retval;

	switch (type) {
	case ACL_TYPE_ACCESS:
		name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS;
		break;
	case ACL_TYPE_DEFAULT:
		name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
		break;
	default:
		return ERR_PTR(-EINVAL);
	}

	retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index, "", NULL, 0);
	if (retval > 0) {
		value = kmalloc(retval, GFP_NOFS);
		if (!value)
			return ERR_PTR(-ENOMEM);
		retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index,
						"", value, retval);
	}

	if (retval > 0)
		acl = ocfs2_acl_from_xattr(value, retval);
	else if (retval == -ENODATA || retval == 0)
		acl = NULL;
	else
		acl = ERR_PTR(retval);

	kfree(value);

	return acl;
}

/*
 * Helper function to set i_mode in memory and disk. Some call paths
 * will not have di_bh or a journal handle to pass, in which case it
 * will create it's own.
 */
static int ocfs2_acl_set_mode(struct inode *inode, struct buffer_head *di_bh,
			      handle_t *handle, umode_t new_mode)
{
	int ret, commit_handle = 0;
	struct ocfs2_dinode *di;

	if (di_bh == NULL) {
		ret = ocfs2_read_inode_block(inode, &di_bh);
		if (ret) {
			mlog_errno(ret);
			goto out;
		}
	} else
		get_bh(di_bh);

	if (handle == NULL) {
		handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb),
					   OCFS2_INODE_UPDATE_CREDITS);
		if (IS_ERR(handle)) {
			ret = PTR_ERR(handle);
			mlog_errno(ret);
			goto out_brelse;
		}

		commit_handle = 1;
	}

	di = (struct ocfs2_dinode *)di_bh->b_data;
	ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
				      OCFS2_JOURNAL_ACCESS_WRITE);
	if (ret) {
		mlog_errno(ret);
		goto out_commit;
	}

	inode->i_mode = new_mode;
	inode->i_ctime = CURRENT_TIME;
	di->i_mode = cpu_to_le16(inode->i_mode);
	di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
	di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);

	ocfs2_journal_dirty(handle, di_bh);

out_commit:
	if (commit_handle)
		ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
out_brelse:
	brelse(di_bh);
out:
	return ret;
}

/*
 * Set the access or default ACL of an inode.
 */
int ocfs2_set_acl(handle_t *handle,
			 struct inode *inode,
			 struct buffer_head *di_bh,
			 int type,
			 struct posix_acl *acl,
			 struct ocfs2_alloc_context *meta_ac,
			 struct ocfs2_alloc_context *data_ac)
{
	int name_index;
	void *value = NULL;
	size_t size = 0;
	int ret;

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

	switch (type) {
	case ACL_TYPE_ACCESS:
		name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS;
		if (acl) {
			umode_t mode = inode->i_mode;
			ret = posix_acl_equiv_mode(acl, &mode);
			if (ret < 0)
				return ret;
			else {
				if (ret == 0)
					acl = NULL;

				ret = ocfs2_acl_set_mode(inode, di_bh,
							 handle, mode);
				if (ret)
					return ret;

			}
		}
		break;
	case ACL_TYPE_DEFAULT:
		name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
		if (!S_ISDIR(inode->i_mode))
			return acl ? -EACCES : 0;
		break;
	default:
		return -EINVAL;
	}

	if (acl) {
		value = ocfs2_acl_to_xattr(acl, &size);
		if (IS_ERR(value))
			return (int)PTR_ERR(value);
	}

	if (handle)
		ret = ocfs2_xattr_set_handle(handle, inode, di_bh, name_index,
					     "", value, size, 0,
					     meta_ac, data_ac);
	else
		ret = ocfs2_xattr_set(inode, name_index, "", value, size, 0);

	kfree(value);

	return ret;
}

int ocfs2_iop_set_acl(struct inode *inode, struct posix_acl *acl, int type)
{
	return ocfs2_set_acl(NULL, inode, NULL, type, acl, NULL, NULL);
}

struct posix_acl *ocfs2_iop_get_acl(struct inode *inode, int type)
{
	struct ocfs2_super *osb;
	struct buffer_head *di_bh = NULL;
	struct posix_acl *acl;
	int ret = -EAGAIN;

	osb = OCFS2_SB(inode->i_sb);
	if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
		return NULL;

	ret = ocfs2_read_inode_block(inode, &di_bh);
	if (ret < 0)
		return ERR_PTR(ret);

	acl = ocfs2_get_acl_nolock(inode, type, di_bh);

	brelse(di_bh);

	return acl;
}
Commit	Line	Data
929fb014 TY	1	/* -- mode: c; c-basic-offset: 8; --
	2	* vim: noexpandtab sw=8 ts=8 sts=0:
	3	*
	4	* acl.c
	5	*
	6	* Copyright (C) 2004, 2008 Oracle. All rights reserved.
	7	*
	8	* CREDITS:
	9	* Lots of code in this file is copy from linux/fs/ext3/acl.c.
	10	* Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de>
	11	*
	12	* This program is free software; you can redistribute it and/or
	13	* modify it under the terms of the GNU General Public
	14	* License version 2 as published by the Free Software Foundation.
	15	*
	16	* This program is distributed in the hope that it will be useful,
	17	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	19	* General Public License for more details.
	20	*/
	21
	22	#include <linux/init.h>
	23	#include <linux/module.h>
5a0e3ad6	24	#include <linux/slab.h>
929fb014 TY	25	#include <linux/string.h>
929fb014 TY	26
929fb014 TY	27	#include <cluster/masklog.h>
	28
	29	#include "ocfs2.h"
	30	#include "alloc.h"
	31	#include "dlmglue.h"
	32	#include "file.h"
fcefd25a MF	33	#include "inode.h"
fcefd25a MF	34	#include "journal.h"
929fb014 TY	35	#include "ocfs2_fs.h"
	36
	37	#include "xattr.h"
	38	#include "acl.h"
	39
	40	/*
	41	* Convert from xattr value to acl struct.
	42	*/
	43	static struct posix_acl ocfs2_acl_from_xattr(const void value, size_t size)
	44	{
	45	int n, count;
	46	struct posix_acl *acl;
	47
	48	if (!value)
	49	return NULL;
	50	if (size < sizeof(struct posix_acl_entry))
	51	return ERR_PTR(-EINVAL);
	52
	53	count = size / sizeof(struct posix_acl_entry);
929fb014 TY	54
	55	acl = posix_acl_alloc(count, GFP_NOFS);
	56	if (!acl)
	57	return ERR_PTR(-ENOMEM);
	58	for (n = 0; n < count; n++) {
	59	struct ocfs2_acl_entry *entry =
	60	(struct ocfs2_acl_entry *)value;
	61
	62	acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag);
	63	acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm);
9522751c EB	64	switch(acl->a_entries[n].e_tag) {
	65	case ACL_USER:
	66	acl->a_entries[n].e_uid =
	67	make_kuid(&init_user_ns,
	68	le32_to_cpu(entry->e_id));
	69	break;
	70	case ACL_GROUP:
	71	acl->a_entries[n].e_gid =
	72	make_kgid(&init_user_ns,
	73	le32_to_cpu(entry->e_id));
	74	break;
	75	default:
	76	break;
	77	}
929fb014 TY	78	value += sizeof(struct posix_acl_entry);
	79
	80	}
	81	return acl;
	82	}
	83
	84	/*
	85	* Convert acl struct to xattr value.
	86	*/
	87	static void ocfs2_acl_to_xattr(const struct posix_acl acl, size_t *size)
	88	{
	89	struct ocfs2_acl_entry *entry = NULL;
	90	char *ocfs2_acl;
	91	size_t n;
	92
	93	size = acl->a_count sizeof(struct posix_acl_entry);
	94
	95	ocfs2_acl = kmalloc(*size, GFP_NOFS);
	96	if (!ocfs2_acl)
	97	return ERR_PTR(-ENOMEM);
	98
	99	entry = (struct ocfs2_acl_entry *)ocfs2_acl;
	100	for (n = 0; n < acl->a_count; n++, entry++) {
	101	entry->e_tag = cpu_to_le16(acl->a_entries[n].e_tag);
	102	entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm);
9522751c EB	103	switch(acl->a_entries[n].e_tag) {
	104	case ACL_USER:
	105	entry->e_id = cpu_to_le32(
	106	from_kuid(&init_user_ns,
	107	acl->a_entries[n].e_uid));
	108	break;
	109	case ACL_GROUP:
	110	entry->e_id = cpu_to_le32(
	111	from_kgid(&init_user_ns,
	112	acl->a_entries[n].e_gid));
	113	break;
	114	default:
	115	entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID);
	116	break;
	117	}
929fb014 TY	118	}
	119	return ocfs2_acl;
	120	}
	121
	122	static struct posix_acl ocfs2_get_acl_nolock(struct inode inode,
	123	int type,
	124	struct buffer_head *di_bh)
	125	{
929fb014 TY	126	int name_index;
	127	char *value = NULL;
	128	struct posix_acl *acl;
	129	int retval;
	130
929fb014 TY	131	switch (type) {
	132	case ACL_TYPE_ACCESS:
	133	name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS;
	134	break;
	135	case ACL_TYPE_DEFAULT:
	136	name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
	137	break;
	138	default:
	139	return ERR_PTR(-EINVAL);
	140	}
	141
	142	retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index, "", NULL, 0);
	143	if (retval > 0) {
	144	value = kmalloc(retval, GFP_NOFS);
	145	if (!value)
	146	return ERR_PTR(-ENOMEM);
	147	retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index,
	148	"", value, retval);
	149	}
	150
	151	if (retval > 0)
	152	acl = ocfs2_acl_from_xattr(value, retval);
	153	else if (retval == -ENODATA \|\| retval == 0)
	154	acl = NULL;
	155	else
	156	acl = ERR_PTR(retval);
	157
	158	kfree(value);
	159
	160	return acl;
	161	}
	162
fcefd25a MF	163	/*
	164	* Helper function to set i_mode in memory and disk. Some call paths
	165	* will not have di_bh or a journal handle to pass, in which case it
	166	* will create it's own.
	167	*/
	168	static int ocfs2_acl_set_mode(struct inode inode, struct buffer_head di_bh,
	169	handle_t *handle, umode_t new_mode)
	170	{
	171	int ret, commit_handle = 0;
	172	struct ocfs2_dinode *di;
	173
	174	if (di_bh == NULL) {
	175	ret = ocfs2_read_inode_block(inode, &di_bh);
	176	if (ret) {
	177	mlog_errno(ret);
	178	goto out;
	179	}
	180	} else
	181	get_bh(di_bh);
	182
	183	if (handle == NULL) {
	184	handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb),
	185	OCFS2_INODE_UPDATE_CREDITS);
	186	if (IS_ERR(handle)) {
	187	ret = PTR_ERR(handle);
	188	mlog_errno(ret);
	189	goto out_brelse;
	190	}
	191
	192	commit_handle = 1;
	193	}
	194
	195	di = (struct ocfs2_dinode *)di_bh->b_data;
	196	ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
	197	OCFS2_JOURNAL_ACCESS_WRITE);
	198	if (ret) {
	199	mlog_errno(ret);
	200	goto out_commit;
	201	}
	202
	203	inode->i_mode = new_mode;
12828061	204	inode->i_ctime = CURRENT_TIME;
fcefd25a	205	di->i_mode = cpu_to_le16(inode->i_mode);
12828061 TM	206	di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
12828061 TM	207	di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
fcefd25a MF	208
	209	ocfs2_journal_dirty(handle, di_bh);
	210
	211	out_commit:
	212	if (commit_handle)
	213	ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
	214	out_brelse:
	215	brelse(di_bh);
	216	out:
	217	return ret;
	218	}
	219
929fb014 TY	220	/*
	221	* Set the access or default ACL of an inode.
	222	*/
702e5bc6	223	int ocfs2_set_acl(handle_t *handle,
929fb014 TY	224	struct inode *inode,
	225	struct buffer_head *di_bh,
	226	int type,
	227	struct posix_acl *acl,
	228	struct ocfs2_alloc_context *meta_ac,
	229	struct ocfs2_alloc_context *data_ac)
	230	{
	231	int name_index;
	232	void *value = NULL;
	233	size_t size = 0;
	234	int ret;
	235
	236	if (S_ISLNK(inode->i_mode))
	237	return -EOPNOTSUPP;
	238
	239	switch (type) {
	240	case ACL_TYPE_ACCESS:
	241	name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS;
	242	if (acl) {
d6952123	243	umode_t mode = inode->i_mode;
929fb014 TY	244	ret = posix_acl_equiv_mode(acl, &mode);
	245	if (ret < 0)
	246	return ret;
	247	else {
929fb014 TY	248	if (ret == 0)
929fb014 TY	249	acl = NULL;
fcefd25a MF	250
	251	ret = ocfs2_acl_set_mode(inode, di_bh,
	252	handle, mode);
	253	if (ret)
	254	return ret;
	255
929fb014 TY	256	}
	257	}
	258	break;
	259	case ACL_TYPE_DEFAULT:
	260	name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
	261	if (!S_ISDIR(inode->i_mode))
	262	return acl ? -EACCES : 0;
	263	break;
	264	default:
	265	return -EINVAL;
	266	}
	267
	268	if (acl) {
	269	value = ocfs2_acl_to_xattr(acl, &size);
	270	if (IS_ERR(value))
	271	return (int)PTR_ERR(value);
	272	}
	273
	274	if (handle)
	275	ret = ocfs2_xattr_set_handle(handle, inode, di_bh, name_index,
	276	"", value, size, 0,
	277	meta_ac, data_ac);
	278	else
	279	ret = ocfs2_xattr_set(inode, name_index, "", value, size, 0);
	280
	281	kfree(value);
	282
	283	return ret;
	284	}
	285
702e5bc6 CH	286	int ocfs2_iop_set_acl(struct inode inode, struct posix_acl acl, int type)
	287	{
	288	return ocfs2_set_acl(NULL, inode, NULL, type, acl, NULL, NULL);
	289	}
	290
4e34e719	291	struct posix_acl ocfs2_iop_get_acl(struct inode inode, int type)
23fc2702	292	{
b74c79e9	293	struct ocfs2_super *osb;
845b6cf3 JZ	294	struct buffer_head *di_bh = NULL;
	295	struct posix_acl *acl;
	296	int ret = -EAGAIN;
	297
b74c79e9	298	osb = OCFS2_SB(inode->i_sb);
845b6cf3	299	if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
4e34e719	300	return NULL;
23fc2702	301
845b6cf3	302	ret = ocfs2_read_inode_block(inode, &di_bh);
4e34e719 CH	303	if (ret < 0)
4e34e719 CH	304	return ERR_PTR(ret);
845b6cf3	305
4e34e719	306	acl = ocfs2_get_acl_nolock(inode, type, di_bh);
845b6cf3 JZ	307
	308	brelse(di_bh);
	309
4e34e719	310	return acl;
23fc2702	311	}