[deliverable/linux.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/string.h>

#define MLOG_MASK_PREFIX ML_INODE
#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;
	di->i_mode = cpu_to_le16(inode->i_mode);

	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 posix_acl *acl = ocfs2_get_acl(inode, ACL_TYPE_ACCESS);

	if (IS_ERR(acl))
		return PTR_ERR(acl);
	if (acl) {
		int 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, *clone;
	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);
	clone = posix_acl_clone(acl, GFP_KERNEL);
	posix_acl_release(acl);
	if (!clone)
		return -ENOMEM;
	ret = posix_acl_chmod_masq(clone, inode->i_mode);
	if (!ret)
		ret = ocfs2_set_acl(NULL, inode, NULL, ACL_TYPE_ACCESS,
				    clone, NULL, NULL);
	posix_acl_release(clone);
	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;
	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) {
		struct posix_acl *clone;

		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;
		}
		clone = posix_acl_clone(acl, GFP_NOFS);
		ret = -ENOMEM;
		if (!clone)
			goto cleanup;

		mode = inode->i_mode;
		ret = posix_acl_create_masq(clone, &mode);
		if (ret >= 0) {
			ret = ocfs2_acl_set_mode(inode, di_bh, handle, mode);
			if (ret > 0) {
				ret = ocfs2_set_acl(handle, inode,
						    di_bh, ACL_TYPE_ACCESS,
						    clone, meta_ac, data_ac);
			}
		}
		posix_acl_release(clone);
	}
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 (!is_owner_or_cap(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;
}

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,
};

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>
	24	#include <linux/string.h>
	25
	26	#define MLOG_MASK_PREFIX ML_INODE
	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;
	211	di->i_mode = cpu_to_le16(inode->i_mode);
	212
	213	ocfs2_journal_dirty(handle, di_bh);
	214
	215	out_commit:
	216	if (commit_handle)
	217	ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
	218	out_brelse:
	219	brelse(di_bh);
	220	out:
	221	return ret;
	222	}
	223
929fb014 TY	224	/*
	225	* Set the access or default ACL of an inode.
	226	*/
	227	static int ocfs2_set_acl(handle_t *handle,
	228	struct inode *inode,
	229	struct buffer_head *di_bh,
	230	int type,
	231	struct posix_acl *acl,
	232	struct ocfs2_alloc_context *meta_ac,
	233	struct ocfs2_alloc_context *data_ac)
	234	{
	235	int name_index;
	236	void *value = NULL;
	237	size_t size = 0;
	238	int ret;
	239
	240	if (S_ISLNK(inode->i_mode))
	241	return -EOPNOTSUPP;
	242
	243	switch (type) {
	244	case ACL_TYPE_ACCESS:
	245	name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS;
	246	if (acl) {
	247	mode_t mode = inode->i_mode;
	248	ret = posix_acl_equiv_mode(acl, &mode);
	249	if (ret < 0)
	250	return ret;
	251	else {
929fb014 TY	252	if (ret == 0)
929fb014 TY	253	acl = NULL;
fcefd25a MF	254
	255	ret = ocfs2_acl_set_mode(inode, di_bh,
	256	handle, mode);
	257	if (ret)
	258	return ret;
	259
929fb014 TY	260	}
	261	}
	262	break;
	263	case ACL_TYPE_DEFAULT:
	264	name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
	265	if (!S_ISDIR(inode->i_mode))
	266	return acl ? -EACCES : 0;
	267	break;
	268	default:
	269	return -EINVAL;
	270	}
	271
	272	if (acl) {
	273	value = ocfs2_acl_to_xattr(acl, &size);
	274	if (IS_ERR(value))
	275	return (int)PTR_ERR(value);
	276	}
	277
	278	if (handle)
	279	ret = ocfs2_xattr_set_handle(handle, inode, di_bh, name_index,
	280	"", value, size, 0,
	281	meta_ac, data_ac);
	282	else
	283	ret = ocfs2_xattr_set(inode, name_index, "", value, size, 0);
	284
	285	kfree(value);
	286
	287	return ret;
	288	}
	289
23fc2702 TY	290	int ocfs2_check_acl(struct inode *inode, int mask)
	291	{
	292	struct posix_acl *acl = ocfs2_get_acl(inode, ACL_TYPE_ACCESS);
	293
	294	if (IS_ERR(acl))
	295	return PTR_ERR(acl);
	296	if (acl) {
	297	int ret = posix_acl_permission(inode, acl, mask);
	298	posix_acl_release(acl);
	299	return ret;
	300	}
	301
	302	return -EAGAIN;
	303	}
	304
060bc66d TY	305	int ocfs2_acl_chmod(struct inode *inode)
	306	{
	307	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	308	struct posix_acl acl, clone;
	309	int ret;
	310
	311	if (S_ISLNK(inode->i_mode))
	312	return -EOPNOTSUPP;
	313
	314	if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
	315	return 0;
	316
	317	acl = ocfs2_get_acl(inode, ACL_TYPE_ACCESS);
	318	if (IS_ERR(acl) \|\| !acl)
	319	return PTR_ERR(acl);
	320	clone = posix_acl_clone(acl, GFP_KERNEL);
	321	posix_acl_release(acl);
	322	if (!clone)
	323	return -ENOMEM;
	324	ret = posix_acl_chmod_masq(clone, inode->i_mode);
	325	if (!ret)
	326	ret = ocfs2_set_acl(NULL, inode, NULL, ACL_TYPE_ACCESS,
	327	clone, NULL, NULL);
	328	posix_acl_release(clone);
	329	return ret;
	330	}
	331
89c38bd0 TY	332	/*
	333	* Initialize the ACLs of a new inode. If parent directory has default ACL,
	334	* then clone to new inode. Called from ocfs2_mknod.
	335	*/
	336	int ocfs2_init_acl(handle_t *handle,
	337	struct inode *inode,
	338	struct inode *dir,
	339	struct buffer_head *di_bh,
	340	struct buffer_head *dir_bh,
	341	struct ocfs2_alloc_context *meta_ac,
	342	struct ocfs2_alloc_context *data_ac)
	343	{
	344	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	345	struct posix_acl *acl = NULL;
	346	int ret = 0;
fcefd25a	347	mode_t mode;
89c38bd0 TY	348
	349	if (!S_ISLNK(inode->i_mode)) {
	350	if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) {
	351	acl = ocfs2_get_acl_nolock(dir, ACL_TYPE_DEFAULT,
	352	dir_bh);
	353	if (IS_ERR(acl))
	354	return PTR_ERR(acl);
	355	}
fcefd25a MF	356	if (!acl) {
	357	mode = inode->i_mode & ~current_umask();
	358	ret = ocfs2_acl_set_mode(inode, di_bh, handle, mode);
	359	if (ret) {
	360	mlog_errno(ret);
	361	goto cleanup;
	362	}
	363	}
89c38bd0 TY	364	}
	365	if ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) && acl) {
	366	struct posix_acl *clone;
89c38bd0 TY	367
	368	if (S_ISDIR(inode->i_mode)) {
	369	ret = ocfs2_set_acl(handle, inode, di_bh,
	370	ACL_TYPE_DEFAULT, acl,
	371	meta_ac, data_ac);
	372	if (ret)
	373	goto cleanup;
	374	}
	375	clone = posix_acl_clone(acl, GFP_NOFS);
	376	ret = -ENOMEM;
	377	if (!clone)
	378	goto cleanup;
	379
	380	mode = inode->i_mode;
	381	ret = posix_acl_create_masq(clone, &mode);
	382	if (ret >= 0) {
fcefd25a	383	ret = ocfs2_acl_set_mode(inode, di_bh, handle, mode);
89c38bd0 TY	384	if (ret > 0) {
	385	ret = ocfs2_set_acl(handle, inode,
	386	di_bh, ACL_TYPE_ACCESS,
	387	clone, meta_ac, data_ac);
	388	}
	389	}
	390	posix_acl_release(clone);
	391	}
	392	cleanup:
	393	posix_acl_release(acl);
	394	return ret;
	395	}
	396
431547b3	397	static size_t ocfs2_xattr_list_acl_access(struct dentry *dentry,
929fb014 TY	398	char *list,
	399	size_t list_len,
	400	const char *name,
431547b3 CH	401	size_t name_len,
431547b3 CH	402	int type)
929fb014	403	{
431547b3	404	struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
929fb014 TY	405	const size_t size = sizeof(POSIX_ACL_XATTR_ACCESS);
	406
	407	if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
	408	return 0;
	409
	410	if (list && size <= list_len)
	411	memcpy(list, POSIX_ACL_XATTR_ACCESS, size);
	412	return size;
	413	}
	414
431547b3	415	static size_t ocfs2_xattr_list_acl_default(struct dentry *dentry,
929fb014 TY	416	char *list,
	417	size_t list_len,
	418	const char *name,
431547b3 CH	419	size_t name_len,
431547b3 CH	420	int type)
929fb014	421	{
431547b3	422	struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
929fb014 TY	423	const size_t size = sizeof(POSIX_ACL_XATTR_DEFAULT);
	424
	425	if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
	426	return 0;
	427
	428	if (list && size <= list_len)
	429	memcpy(list, POSIX_ACL_XATTR_DEFAULT, size);
	430	return size;
	431	}
	432
431547b3 CH	433	static int ocfs2_xattr_get_acl(struct dentry dentry, const char name,
431547b3 CH	434	void *buffer, size_t size, int type)
929fb014	435	{
431547b3	436	struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
929fb014 TY	437	struct posix_acl *acl;
	438	int ret;
	439
431547b3 CH	440	if (strcmp(name, "") != 0)
431547b3 CH	441	return -EINVAL;
929fb014 TY	442	if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
	443	return -EOPNOTSUPP;
	444
431547b3	445	acl = ocfs2_get_acl(dentry->d_inode, type);
929fb014 TY	446	if (IS_ERR(acl))
	447	return PTR_ERR(acl);
	448	if (acl == NULL)
	449	return -ENODATA;
	450	ret = posix_acl_to_xattr(acl, buffer, size);
	451	posix_acl_release(acl);
	452
	453	return ret;
	454	}
	455
431547b3 CH	456	static int ocfs2_xattr_set_acl(struct dentry dentry, const char name,
431547b3 CH	457	const void *value, size_t size, int flags, int type)
929fb014	458	{
431547b3	459	struct inode *inode = dentry->d_inode;
929fb014 TY	460	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	461	struct posix_acl *acl;
	462	int ret = 0;
	463
431547b3 CH	464	if (strcmp(name, "") != 0)
431547b3 CH	465	return -EINVAL;
929fb014 TY	466	if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
	467	return -EOPNOTSUPP;
	468
	469	if (!is_owner_or_cap(inode))
	470	return -EPERM;
	471
	472	if (value) {
	473	acl = posix_acl_from_xattr(value, size);
	474	if (IS_ERR(acl))
	475	return PTR_ERR(acl);
	476	else if (acl) {
	477	ret = posix_acl_valid(acl);
	478	if (ret)
	479	goto cleanup;
	480	}
	481	} else
	482	acl = NULL;
	483
	484	ret = ocfs2_set_acl(NULL, inode, NULL, type, acl, NULL, NULL);
	485
	486	cleanup:
	487	posix_acl_release(acl);
	488	return ret;
	489	}
	490
929fb014 TY	491	struct xattr_handler ocfs2_xattr_acl_access_handler = {
929fb014 TY	492	.prefix = POSIX_ACL_XATTR_ACCESS,
431547b3	493	.flags = ACL_TYPE_ACCESS,
929fb014	494	.list = ocfs2_xattr_list_acl_access,
431547b3 CH	495	.get = ocfs2_xattr_get_acl,
431547b3 CH	496	.set = ocfs2_xattr_set_acl,
929fb014 TY	497	};
	498
	499	struct xattr_handler ocfs2_xattr_acl_default_handler = {
	500	.prefix = POSIX_ACL_XATTR_DEFAULT,
431547b3	501	.flags = ACL_TYPE_DEFAULT,
929fb014	502	.list = ocfs2_xattr_list_acl_default,
431547b3 CH	503	.get = ocfs2_xattr_get_acl,
431547b3 CH	504	.set = ocfs2_xattr_set_acl,
929fb014	505	};