[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);
	if (count < 0)
		return ERR_PTR(-EINVAL);
	if (count == 0)
		return NULL;

	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);
		acl->a_entries[n].e_id   = le32_to_cpu(entry->e_id);
		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);
		entry->e_id   = cpu_to_le32(acl->a_entries[n].e_id);
	}
	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;
}


/*
 * Get posix acl.
 */
static struct posix_acl *ocfs2_get_acl(struct inode *inode, int type)
{
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	struct buffer_head *di_bh = NULL;
	struct posix_acl *acl;
	int ret;

	if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
		return NULL;

	ret = ocfs2_inode_lock(inode, &di_bh, 0);
	if (ret < 0) {
		mlog_errno(ret);
		acl = ERR_PTR(ret);
		return acl;
	}

	acl = ocfs2_get_acl_nolock(inode, type, di_bh);

	ocfs2_inode_unlock(inode, 0);

	brelse(di_bh);

	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.
 */
static 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) {
			mode_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_check_acl(struct inode *inode, int mask)
{
	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 ret;

	ret = ocfs2_read_inode_block(inode, &di_bh);
	if (ret < 0) {
		mlog_errno(ret);
		return ret;
	}

	acl = ocfs2_get_acl_nolock(inode, ACL_TYPE_ACCESS, di_bh);

	brelse(di_bh);

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

	return -EAGAIN;
}

int ocfs2_acl_chmod(struct inode *inode)
{
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	struct posix_acl *acl;
	int ret;

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

	if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
		return 0;

	acl = ocfs2_get_acl(inode, ACL_TYPE_ACCESS);
	if (IS_ERR(acl) || !acl)
		return PTR_ERR(acl);
	ret = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
	if (ret)
		return ret;
	ret = ocfs2_set_acl(NULL, inode, NULL, ACL_TYPE_ACCESS,
			    acl, NULL, NULL);
	posix_acl_release(acl);
	return ret;
}

/*
 * Initialize the ACLs of a new inode. If parent directory has default ACL,
 * then clone to new inode. Called from ocfs2_mknod.
 */
int ocfs2_init_acl(handle_t *handle,
		   struct inode *inode,
		   struct inode *dir,
		   struct buffer_head *di_bh,
		   struct buffer_head *dir_bh,
		   struct ocfs2_alloc_context *meta_ac,
		   struct ocfs2_alloc_context *data_ac)
{
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	struct posix_acl *acl = NULL;
	int ret = 0, ret2;
	mode_t mode;

	if (!S_ISLNK(inode->i_mode)) {
		if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) {
			acl = ocfs2_get_acl_nolock(dir, ACL_TYPE_DEFAULT,
						   dir_bh);
			if (IS_ERR(acl))
				return PTR_ERR(acl);
		}
		if (!acl) {
			mode = inode->i_mode & ~current_umask();
			ret = ocfs2_acl_set_mode(inode, di_bh, handle, mode);
			if (ret) {
				mlog_errno(ret);
				goto cleanup;
			}
		}
	}
	if ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) && acl) {
		if (S_ISDIR(inode->i_mode)) {
			ret = ocfs2_set_acl(handle, inode, di_bh,
					    ACL_TYPE_DEFAULT, acl,
					    meta_ac, data_ac);
			if (ret)
				goto cleanup;
		}
		mode = inode->i_mode;
		ret = posix_acl_create(&acl, GFP_NOFS, &mode);
		if (ret < 0)
			return ret;

		ret2 = ocfs2_acl_set_mode(inode, di_bh, handle, mode);
		if (ret2) {
			mlog_errno(ret2);
			ret = ret2;
			goto cleanup;
		}
		if (ret > 0) {
			ret = ocfs2_set_acl(handle, inode,
					    di_bh, ACL_TYPE_ACCESS,
					    acl, meta_ac, data_ac);
		}
	}
cleanup:
	posix_acl_release(acl);
	return ret;
}

static size_t ocfs2_xattr_list_acl_access(struct dentry *dentry,
					  char *list,
					  size_t list_len,
					  const char *name,
					  size_t name_len,
					  int type)
{
	struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
	const size_t size = sizeof(POSIX_ACL_XATTR_ACCESS);

	if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
		return 0;

	if (list && size <= list_len)
		memcpy(list, POSIX_ACL_XATTR_ACCESS, size);
	return size;
}

static size_t ocfs2_xattr_list_acl_default(struct dentry *dentry,
					   char *list,
					   size_t list_len,
					   const char *name,
					   size_t name_len,
					   int type)
{
	struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
	const size_t size = sizeof(POSIX_ACL_XATTR_DEFAULT);

	if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
		return 0;

	if (list && size <= list_len)
		memcpy(list, POSIX_ACL_XATTR_DEFAULT, size);
	return size;
}

static int ocfs2_xattr_get_acl(struct dentry *dentry, const char *name,
		void *buffer, size_t size, int type)
{
	struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
	struct posix_acl *acl;
	int ret;

	if (strcmp(name, "") != 0)
		return -EINVAL;
	if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
		return -EOPNOTSUPP;

	acl = ocfs2_get_acl(dentry->d_inode, type);
	if (IS_ERR(acl))
		return PTR_ERR(acl);
	if (acl == NULL)
		return -ENODATA;
	ret = posix_acl_to_xattr(acl, buffer, size);
	posix_acl_release(acl);

	return ret;
}

static int ocfs2_xattr_set_acl(struct dentry *dentry, const char *name,
		const void *value, size_t size, int flags, int type)
{
	struct inode *inode = dentry->d_inode;
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	struct posix_acl *acl;
	int ret = 0;

	if (strcmp(name, "") != 0)
		return -EINVAL;
	if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
		return -EOPNOTSUPP;

	if (!inode_owner_or_capable(inode))
		return -EPERM;

	if (value) {
		acl = posix_acl_from_xattr(value, size);
		if (IS_ERR(acl))
			return PTR_ERR(acl);
		else if (acl) {
			ret = posix_acl_valid(acl);
			if (ret)
				goto cleanup;
		}
	} else
		acl = NULL;

	ret = ocfs2_set_acl(NULL, inode, NULL, type, acl, NULL, NULL);

cleanup:
	posix_acl_release(acl);
	return ret;
}

const struct xattr_handler ocfs2_xattr_acl_access_handler = {
	.prefix	= POSIX_ACL_XATTR_ACCESS,
	.flags	= ACL_TYPE_ACCESS,
	.list	= ocfs2_xattr_list_acl_access,
	.get	= ocfs2_xattr_get_acl,
	.set	= ocfs2_xattr_set_acl,
};

const struct xattr_handler ocfs2_xattr_acl_default_handler = {
	.prefix	= POSIX_ACL_XATTR_DEFAULT,
	.flags	= ACL_TYPE_DEFAULT,
	.list	= ocfs2_xattr_list_acl_default,
	.get	= ocfs2_xattr_get_acl,
	.set	= ocfs2_xattr_set_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);
	54	if (count < 0)
	55	return ERR_PTR(-EINVAL);
	56	if (count == 0)
	57	return NULL;
	58
	59	acl = posix_acl_alloc(count, GFP_NOFS);
	60	if (!acl)
	61	return ERR_PTR(-ENOMEM);
	62	for (n = 0; n < count; n++) {
	63	struct ocfs2_acl_entry *entry =
	64	(struct ocfs2_acl_entry *)value;
	65
	66	acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag);
	67	acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm);
	68	acl->a_entries[n].e_id = le32_to_cpu(entry->e_id);
	69	value += sizeof(struct posix_acl_entry);
	70
	71	}
	72	return acl;
	73	}
	74
	75	/*
	76	* Convert acl struct to xattr value.
	77	*/
	78	static void ocfs2_acl_to_xattr(const struct posix_acl acl, size_t *size)
	79	{
	80	struct ocfs2_acl_entry *entry = NULL;
	81	char *ocfs2_acl;
	82	size_t n;
	83
	84	size = acl->a_count sizeof(struct posix_acl_entry);
	85
	86	ocfs2_acl = kmalloc(*size, GFP_NOFS);
	87	if (!ocfs2_acl)
	88	return ERR_PTR(-ENOMEM);
	89
	90	entry = (struct ocfs2_acl_entry *)ocfs2_acl;
	91	for (n = 0; n < acl->a_count; n++, entry++) {
	92	entry->e_tag = cpu_to_le16(acl->a_entries[n].e_tag);
	93	entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm);
	94	entry->e_id = cpu_to_le32(acl->a_entries[n].e_id);
	95	}
	96	return ocfs2_acl;
	97	}
	98
99	static struct posix_acl ocfs2_get_acl_nolock(struct inode inode,
100	int type,
101	struct buffer_head *di_bh)
102	{
929fb014 TY	103	int name_index;
	104	char *value = NULL;
	105	struct posix_acl *acl;
	106	int retval;
	107
929fb014 TY	108	switch (type) {
	109	case ACL_TYPE_ACCESS:
	110	name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS;
	111	break;
	112	case ACL_TYPE_DEFAULT:
	113	name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
	114	break;
	115	default:
	116	return ERR_PTR(-EINVAL);
	117	}
	118
	119	retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index, "", NULL, 0);
	120	if (retval > 0) {
	121	value = kmalloc(retval, GFP_NOFS);
	122	if (!value)
	123	return ERR_PTR(-ENOMEM);
	124	retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index,
	125	"", value, retval);
	126	}
	127
	128	if (retval > 0)
	129	acl = ocfs2_acl_from_xattr(value, retval);
	130	else if (retval == -ENODATA \|\| retval == 0)
	131	acl = NULL;
	132	else
	133	acl = ERR_PTR(retval);
	134
	135	kfree(value);
	136
	137	return acl;
	138	}
	139
	140
	141	/*
	142	* Get posix acl.
	143	*/
	144	static struct posix_acl ocfs2_get_acl(struct inode inode, int type)
	145	{
	146	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	147	struct buffer_head *di_bh = NULL;
	148	struct posix_acl *acl;
	149	int ret;
	150
	151	if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
	152	return NULL;
	153
	154	ret = ocfs2_inode_lock(inode, &di_bh, 0);
	155	if (ret < 0) {
	156	mlog_errno(ret);
	157	acl = ERR_PTR(ret);
	158	return acl;
	159	}
	160
	161	acl = ocfs2_get_acl_nolock(inode, type, di_bh);
	162
	163	ocfs2_inode_unlock(inode, 0);
	164
	165	brelse(di_bh);
	166
	167	return acl;
	168	}
	169
fcefd25a MF	170	/*
	171	* Helper function to set i_mode in memory and disk. Some call paths
	172	* will not have di_bh or a journal handle to pass, in which case it
	173	* will create it's own.
	174	*/
	175	static int ocfs2_acl_set_mode(struct inode inode, struct buffer_head di_bh,
	176	handle_t *handle, umode_t new_mode)
	177	{
	178	int ret, commit_handle = 0;
	179	struct ocfs2_dinode *di;
	180
	181	if (di_bh == NULL) {
	182	ret = ocfs2_read_inode_block(inode, &di_bh);
	183	if (ret) {
	184	mlog_errno(ret);
	185	goto out;
	186	}
	187	} else
	188	get_bh(di_bh);
	189
	190	if (handle == NULL) {
	191	handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb),
	192	OCFS2_INODE_UPDATE_CREDITS);
	193	if (IS_ERR(handle)) {
	194	ret = PTR_ERR(handle);
	195	mlog_errno(ret);
	196	goto out_brelse;
	197	}
	198
	199	commit_handle = 1;
	200	}
	201
	202	di = (struct ocfs2_dinode *)di_bh->b_data;
	203	ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
	204	OCFS2_JOURNAL_ACCESS_WRITE);
	205	if (ret) {
	206	mlog_errno(ret);
	207	goto out_commit;
	208	}
	209
	210	inode->i_mode = new_mode;
12828061	211	inode->i_ctime = CURRENT_TIME;
fcefd25a	212	di->i_mode = cpu_to_le16(inode->i_mode);
12828061 TM	213	di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
12828061 TM	214	di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
fcefd25a MF	215
	216	ocfs2_journal_dirty(handle, di_bh);
	217
	218	out_commit:
	219	if (commit_handle)
	220	ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
	221	out_brelse:
	222	brelse(di_bh);
	223	out:
	224	return ret;
	225	}
	226
929fb014 TY	227	/*
	228	* Set the access or default ACL of an inode.
	229	*/
	230	static int ocfs2_set_acl(handle_t *handle,
	231	struct inode *inode,
	232	struct buffer_head *di_bh,
	233	int type,
	234	struct posix_acl *acl,
	235	struct ocfs2_alloc_context *meta_ac,
	236	struct ocfs2_alloc_context *data_ac)
	237	{
	238	int name_index;
	239	void *value = NULL;
	240	size_t size = 0;
	241	int ret;
	242
	243	if (S_ISLNK(inode->i_mode))
	244	return -EOPNOTSUPP;
	245
	246	switch (type) {
	247	case ACL_TYPE_ACCESS:
	248	name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS;
	249	if (acl) {
	250	mode_t mode = inode->i_mode;
	251	ret = posix_acl_equiv_mode(acl, &mode);
	252	if (ret < 0)
	253	return ret;
	254	else {
929fb014 TY	255	if (ret == 0)
929fb014 TY	256	acl = NULL;
fcefd25a MF	257
	258	ret = ocfs2_acl_set_mode(inode, di_bh,
	259	handle, mode);
	260	if (ret)
	261	return ret;
	262
929fb014 TY	263	}
	264	}
	265	break;
	266	case ACL_TYPE_DEFAULT:
	267	name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
	268	if (!S_ISDIR(inode->i_mode))
	269	return acl ? -EACCES : 0;
	270	break;
	271	default:
	272	return -EINVAL;
	273	}
	274
	275	if (acl) {
	276	value = ocfs2_acl_to_xattr(acl, &size);
	277	if (IS_ERR(value))
	278	return (int)PTR_ERR(value);
	279	}
	280
	281	if (handle)
	282	ret = ocfs2_xattr_set_handle(handle, inode, di_bh, name_index,
	283	"", value, size, 0,
	284	meta_ac, data_ac);
	285	else
	286	ret = ocfs2_xattr_set(inode, name_index, "", value, size, 0);
	287
	288	kfree(value);
	289
	290	return ret;
	291	}
	292
7e40145e	293	int ocfs2_check_acl(struct inode *inode, int mask)
23fc2702	294	{
b74c79e9	295	struct ocfs2_super *osb;
845b6cf3 JZ	296	struct buffer_head *di_bh = NULL;
	297	struct posix_acl *acl;
	298	int ret = -EAGAIN;
	299
b74c79e9	300	osb = OCFS2_SB(inode->i_sb);
845b6cf3 JZ	301	if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
845b6cf3 JZ	302	return ret;
23fc2702	303
845b6cf3 JZ	304	ret = ocfs2_read_inode_block(inode, &di_bh);
	305	if (ret < 0) {
	306	mlog_errno(ret);
	307	return ret;
	308	}
	309
	310	acl = ocfs2_get_acl_nolock(inode, ACL_TYPE_ACCESS, di_bh);
	311
	312	brelse(di_bh);
	313
	314	if (IS_ERR(acl)) {
	315	mlog_errno(PTR_ERR(acl));
23fc2702	316	return PTR_ERR(acl);
845b6cf3	317	}
23fc2702	318	if (acl) {
845b6cf3	319	ret = posix_acl_permission(inode, acl, mask);
23fc2702 TY	320	posix_acl_release(acl);
	321	return ret;
	322	}
	323
	324	return -EAGAIN;
	325	}
	326
060bc66d TY	327	int ocfs2_acl_chmod(struct inode *inode)
	328	{
	329	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
bc26ab5f	330	struct posix_acl *acl;
060bc66d TY	331	int ret;
	332
	333	if (S_ISLNK(inode->i_mode))
	334	return -EOPNOTSUPP;
	335
	336	if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
	337	return 0;
	338
	339	acl = ocfs2_get_acl(inode, ACL_TYPE_ACCESS);
	340	if (IS_ERR(acl) \|\| !acl)
	341	return PTR_ERR(acl);
bc26ab5f AV	342	ret = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
	343	if (ret)
	344	return ret;
	345	ret = ocfs2_set_acl(NULL, inode, NULL, ACL_TYPE_ACCESS,
	346	acl, NULL, NULL);
060bc66d	347	posix_acl_release(acl);
060bc66d TY	348	return ret;
	349	}
	350
89c38bd0 TY	351	/*
	352	* Initialize the ACLs of a new inode. If parent directory has default ACL,
	353	* then clone to new inode. Called from ocfs2_mknod.
	354	*/
	355	int ocfs2_init_acl(handle_t *handle,
	356	struct inode *inode,
	357	struct inode *dir,
	358	struct buffer_head *di_bh,
	359	struct buffer_head *dir_bh,
	360	struct ocfs2_alloc_context *meta_ac,
	361	struct ocfs2_alloc_context *data_ac)
	362	{
	363	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	364	struct posix_acl *acl = NULL;
6eda3dd3	365	int ret = 0, ret2;
fcefd25a	366	mode_t mode;
89c38bd0 TY	367
	368	if (!S_ISLNK(inode->i_mode)) {
	369	if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) {
	370	acl = ocfs2_get_acl_nolock(dir, ACL_TYPE_DEFAULT,
	371	dir_bh);
	372	if (IS_ERR(acl))
	373	return PTR_ERR(acl);
	374	}
fcefd25a MF	375	if (!acl) {
	376	mode = inode->i_mode & ~current_umask();
	377	ret = ocfs2_acl_set_mode(inode, di_bh, handle, mode);
	378	if (ret) {
	379	mlog_errno(ret);
	380	goto cleanup;
	381	}
	382	}
89c38bd0 TY	383	}
89c38bd0 TY	384	if ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) && acl) {
89c38bd0 TY	385	if (S_ISDIR(inode->i_mode)) {
	386	ret = ocfs2_set_acl(handle, inode, di_bh,
	387	ACL_TYPE_DEFAULT, acl,
	388	meta_ac, data_ac);
	389	if (ret)
	390	goto cleanup;
	391	}
89c38bd0	392	mode = inode->i_mode;
826cae2f AV	393	ret = posix_acl_create(&acl, GFP_NOFS, &mode);
	394	if (ret < 0)
	395	return ret;
	396
	397	ret2 = ocfs2_acl_set_mode(inode, di_bh, handle, mode);
	398	if (ret2) {
	399	mlog_errno(ret2);
	400	ret = ret2;
	401	goto cleanup;
	402	}
	403	if (ret > 0) {
	404	ret = ocfs2_set_acl(handle, inode,
	405	di_bh, ACL_TYPE_ACCESS,
	406	acl, meta_ac, data_ac);
89c38bd0	407	}
89c38bd0 TY	408	}
	409	cleanup:
	410	posix_acl_release(acl);
	411	return ret;
	412	}
	413
431547b3	414	static size_t ocfs2_xattr_list_acl_access(struct dentry *dentry,
929fb014 TY	415	char *list,
	416	size_t list_len,
	417	const char *name,
431547b3 CH	418	size_t name_len,
431547b3 CH	419	int type)
929fb014	420	{
431547b3	421	struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
929fb014 TY	422	const size_t size = sizeof(POSIX_ACL_XATTR_ACCESS);
	423
	424	if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
	425	return 0;
	426
	427	if (list && size <= list_len)
	428	memcpy(list, POSIX_ACL_XATTR_ACCESS, size);
	429	return size;
	430	}
	431
431547b3	432	static size_t ocfs2_xattr_list_acl_default(struct dentry *dentry,
929fb014 TY	433	char *list,
	434	size_t list_len,
	435	const char *name,
431547b3 CH	436	size_t name_len,
431547b3 CH	437	int type)
929fb014	438	{
431547b3	439	struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
929fb014 TY	440	const size_t size = sizeof(POSIX_ACL_XATTR_DEFAULT);
	441
	442	if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
	443	return 0;
	444
	445	if (list && size <= list_len)
	446	memcpy(list, POSIX_ACL_XATTR_DEFAULT, size);
	447	return size;
	448	}
	449
431547b3 CH	450	static int ocfs2_xattr_get_acl(struct dentry dentry, const char name,
431547b3 CH	451	void *buffer, size_t size, int type)
929fb014	452	{
431547b3	453	struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
929fb014 TY	454	struct posix_acl *acl;
	455	int ret;
	456
431547b3 CH	457	if (strcmp(name, "") != 0)
431547b3 CH	458	return -EINVAL;
929fb014 TY	459	if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
	460	return -EOPNOTSUPP;
	461
431547b3	462	acl = ocfs2_get_acl(dentry->d_inode, type);
929fb014 TY	463	if (IS_ERR(acl))
	464	return PTR_ERR(acl);
	465	if (acl == NULL)
	466	return -ENODATA;
	467	ret = posix_acl_to_xattr(acl, buffer, size);
	468	posix_acl_release(acl);
	469
	470	return ret;
	471	}
	472
431547b3 CH	473	static int ocfs2_xattr_set_acl(struct dentry dentry, const char name,
431547b3 CH	474	const void *value, size_t size, int flags, int type)
929fb014	475	{
431547b3	476	struct inode *inode = dentry->d_inode;
929fb014 TY	477	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	478	struct posix_acl *acl;
	479	int ret = 0;
	480
431547b3 CH	481	if (strcmp(name, "") != 0)
431547b3 CH	482	return -EINVAL;
929fb014 TY	483	if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
	484	return -EOPNOTSUPP;
	485
2e149670	486	if (!inode_owner_or_capable(inode))
929fb014 TY	487	return -EPERM;
	488
	489	if (value) {
	490	acl = posix_acl_from_xattr(value, size);
	491	if (IS_ERR(acl))
	492	return PTR_ERR(acl);
	493	else if (acl) {
	494	ret = posix_acl_valid(acl);
	495	if (ret)
	496	goto cleanup;
	497	}
	498	} else
	499	acl = NULL;
	500
	501	ret = ocfs2_set_acl(NULL, inode, NULL, type, acl, NULL, NULL);
	502
	503	cleanup:
	504	posix_acl_release(acl);
	505	return ret;
	506	}
	507
537d81ca	508	const struct xattr_handler ocfs2_xattr_acl_access_handler = {
929fb014	509	.prefix = POSIX_ACL_XATTR_ACCESS,
431547b3	510	.flags = ACL_TYPE_ACCESS,
929fb014	511	.list = ocfs2_xattr_list_acl_access,
431547b3 CH	512	.get = ocfs2_xattr_get_acl,
431547b3 CH	513	.set = ocfs2_xattr_set_acl,
929fb014 TY	514	};
929fb014 TY	515
537d81ca	516	const struct xattr_handler ocfs2_xattr_acl_default_handler = {
929fb014	517	.prefix = POSIX_ACL_XATTR_DEFAULT,
431547b3	518	.flags = ACL_TYPE_DEFAULT,
929fb014	519	.list = ocfs2_xattr_list_acl_default,
431547b3 CH	520	.get = ocfs2_xattr_get_acl,
431547b3 CH	521	.set = ocfs2_xattr_set_acl,
929fb014	522	};