[net-next-2.6.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>

#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;
	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 = OCFS2_SB(inode->i_sb);
	struct buffer_head *di_bh = NULL;
	struct posix_acl *acl;
	int ret = -EAGAIN;

	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, *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, 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) {
		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) {
			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,
						    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;
}

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>
	26
	27	#define MLOG_MASK_PREFIX ML_INODE
	28	#include <cluster/masklog.h>
	29
	30	#include "ocfs2.h"
	31	#include "alloc.h"
	32	#include "dlmglue.h"
	33	#include "file.h"
fcefd25a MF	34	#include "inode.h"
fcefd25a MF	35	#include "journal.h"
929fb014 TY	36	#include "ocfs2_fs.h"
	37
	38	#include "xattr.h"
	39	#include "acl.h"
	40
	41	/*
	42	* Convert from xattr value to acl struct.
	43	*/
	44	static struct posix_acl ocfs2_acl_from_xattr(const void value, size_t size)
	45	{
	46	int n, count;
	47	struct posix_acl *acl;
	48
	49	if (!value)
	50	return NULL;
	51	if (size < sizeof(struct posix_acl_entry))
	52	return ERR_PTR(-EINVAL);
	53
	54	count = size / sizeof(struct posix_acl_entry);
	55	if (count < 0)
	56	return ERR_PTR(-EINVAL);
	57	if (count == 0)
	58	return NULL;
	59
	60	acl = posix_acl_alloc(count, GFP_NOFS);
	61	if (!acl)
	62	return ERR_PTR(-ENOMEM);
	63	for (n = 0; n < count; n++) {
	64	struct ocfs2_acl_entry *entry =
	65	(struct ocfs2_acl_entry *)value;
	66
	67	acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag);
	68	acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm);
	69	acl->a_entries[n].e_id = le32_to_cpu(entry->e_id);
	70	value += sizeof(struct posix_acl_entry);
	71
	72	}
	73	return acl;
	74	}
	75
	76	/*
	77	* Convert acl struct to xattr value.
	78	*/
	79	static void ocfs2_acl_to_xattr(const struct posix_acl acl, size_t *size)
	80	{
	81	struct ocfs2_acl_entry *entry = NULL;
	82	char *ocfs2_acl;
	83	size_t n;
	84
	85	size = acl->a_count sizeof(struct posix_acl_entry);
	86
	87	ocfs2_acl = kmalloc(*size, GFP_NOFS);
	88	if (!ocfs2_acl)
	89	return ERR_PTR(-ENOMEM);
	90
	91	entry = (struct ocfs2_acl_entry *)ocfs2_acl;
	92	for (n = 0; n < acl->a_count; n++, entry++) {
	93	entry->e_tag = cpu_to_le16(acl->a_entries[n].e_tag);
	94	entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm);
	95	entry->e_id = cpu_to_le32(acl->a_entries[n].e_id);
	96	}
	97	return ocfs2_acl;
	98	}
	99
100	static struct posix_acl ocfs2_get_acl_nolock(struct inode inode,
101	int type,
102	struct buffer_head *di_bh)
103	{
929fb014 TY	104	int name_index;
	105	char *value = NULL;
	106	struct posix_acl *acl;
	107	int retval;
	108
929fb014 TY	109	switch (type) {
	110	case ACL_TYPE_ACCESS:
	111	name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS;
	112	break;
	113	case ACL_TYPE_DEFAULT:
	114	name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
	115	break;
	116	default:
	117	return ERR_PTR(-EINVAL);
	118	}
	119
	120	retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index, "", NULL, 0);
	121	if (retval > 0) {
	122	value = kmalloc(retval, GFP_NOFS);
	123	if (!value)
	124	return ERR_PTR(-ENOMEM);
	125	retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index,
	126	"", value, retval);
	127	}
	128
	129	if (retval > 0)
	130	acl = ocfs2_acl_from_xattr(value, retval);
	131	else if (retval == -ENODATA \|\| retval == 0)
	132	acl = NULL;
	133	else
	134	acl = ERR_PTR(retval);
	135
	136	kfree(value);
	137
	138	return acl;
	139	}
	140
	141
	142	/*
	143	* Get posix acl.
	144	*/
	145	static struct posix_acl ocfs2_get_acl(struct inode inode, int type)
	146	{
	147	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	148	struct buffer_head *di_bh = NULL;
	149	struct posix_acl *acl;
	150	int ret;
	151
	152	if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
	153	return NULL;
	154
	155	ret = ocfs2_inode_lock(inode, &di_bh, 0);
	156	if (ret < 0) {
	157	mlog_errno(ret);
	158	acl = ERR_PTR(ret);
	159	return acl;
	160	}
	161
	162	acl = ocfs2_get_acl_nolock(inode, type, di_bh);
	163
	164	ocfs2_inode_unlock(inode, 0);
	165
	166	brelse(di_bh);
	167
	168	return acl;
	169	}
	170
fcefd25a MF	171	/*
	172	* Helper function to set i_mode in memory and disk. Some call paths
	173	* will not have di_bh or a journal handle to pass, in which case it
	174	* will create it's own.
	175	*/
	176	static int ocfs2_acl_set_mode(struct inode inode, struct buffer_head di_bh,
	177	handle_t *handle, umode_t new_mode)
	178	{
	179	int ret, commit_handle = 0;
	180	struct ocfs2_dinode *di;
	181
	182	if (di_bh == NULL) {
	183	ret = ocfs2_read_inode_block(inode, &di_bh);
	184	if (ret) {
	185	mlog_errno(ret);
	186	goto out;
	187	}
	188	} else
	189	get_bh(di_bh);
	190
	191	if (handle == NULL) {
	192	handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb),
	193	OCFS2_INODE_UPDATE_CREDITS);
	194	if (IS_ERR(handle)) {
	195	ret = PTR_ERR(handle);
	196	mlog_errno(ret);
	197	goto out_brelse;
	198	}
	199
	200	commit_handle = 1;
	201	}
	202
	203	di = (struct ocfs2_dinode *)di_bh->b_data;
	204	ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
	205	OCFS2_JOURNAL_ACCESS_WRITE);
	206	if (ret) {
	207	mlog_errno(ret);
	208	goto out_commit;
	209	}
	210
	211	inode->i_mode = new_mode;
12828061	212	inode->i_ctime = CURRENT_TIME;
fcefd25a	213	di->i_mode = cpu_to_le16(inode->i_mode);
12828061 TM	214	di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
12828061 TM	215	di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
fcefd25a MF	216
	217	ocfs2_journal_dirty(handle, di_bh);
	218
	219	out_commit:
	220	if (commit_handle)
	221	ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
	222	out_brelse:
	223	brelse(di_bh);
	224	out:
	225	return ret;
	226	}
	227
929fb014 TY	228	/*
	229	* Set the access or default ACL of an inode.
	230	*/
	231	static int ocfs2_set_acl(handle_t *handle,
	232	struct inode *inode,
	233	struct buffer_head *di_bh,
	234	int type,
	235	struct posix_acl *acl,
	236	struct ocfs2_alloc_context *meta_ac,
	237	struct ocfs2_alloc_context *data_ac)
	238	{
	239	int name_index;
	240	void *value = NULL;
	241	size_t size = 0;
	242	int ret;
	243
	244	if (S_ISLNK(inode->i_mode))
	245	return -EOPNOTSUPP;
	246
	247	switch (type) {
	248	case ACL_TYPE_ACCESS:
	249	name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS;
	250	if (acl) {
	251	mode_t mode = inode->i_mode;
	252	ret = posix_acl_equiv_mode(acl, &mode);
	253	if (ret < 0)
	254	return ret;
	255	else {
929fb014 TY	256	if (ret == 0)
929fb014 TY	257	acl = NULL;
fcefd25a MF	258
	259	ret = ocfs2_acl_set_mode(inode, di_bh,
	260	handle, mode);
	261	if (ret)
	262	return ret;
	263
929fb014 TY	264	}
	265	}
	266	break;
	267	case ACL_TYPE_DEFAULT:
	268	name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
	269	if (!S_ISDIR(inode->i_mode))
	270	return acl ? -EACCES : 0;
	271	break;
	272	default:
	273	return -EINVAL;
	274	}
	275
	276	if (acl) {
	277	value = ocfs2_acl_to_xattr(acl, &size);
	278	if (IS_ERR(value))
	279	return (int)PTR_ERR(value);
	280	}
	281
	282	if (handle)
	283	ret = ocfs2_xattr_set_handle(handle, inode, di_bh, name_index,
	284	"", value, size, 0,
	285	meta_ac, data_ac);
	286	else
	287	ret = ocfs2_xattr_set(inode, name_index, "", value, size, 0);
	288
	289	kfree(value);
	290
	291	return ret;
	292	}
	293
23fc2702 TY	294	int ocfs2_check_acl(struct inode *inode, int mask)
23fc2702 TY	295	{
845b6cf3 JZ	296	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	297	struct buffer_head *di_bh = NULL;
	298	struct posix_acl *acl;
	299	int ret = -EAGAIN;
	300
	301	if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
	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);
	330	struct posix_acl acl, clone;
	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);
	342	clone = posix_acl_clone(acl, GFP_KERNEL);
	343	posix_acl_release(acl);
	344	if (!clone)
	345	return -ENOMEM;
	346	ret = posix_acl_chmod_masq(clone, inode->i_mode);
	347	if (!ret)
	348	ret = ocfs2_set_acl(NULL, inode, NULL, ACL_TYPE_ACCESS,
	349	clone, NULL, NULL);
	350	posix_acl_release(clone);
	351	return ret;
	352	}
	353
89c38bd0 TY	354	/*
	355	* Initialize the ACLs of a new inode. If parent directory has default ACL,
	356	* then clone to new inode. Called from ocfs2_mknod.
	357	*/
	358	int ocfs2_init_acl(handle_t *handle,
	359	struct inode *inode,
	360	struct inode *dir,
	361	struct buffer_head *di_bh,
	362	struct buffer_head *dir_bh,
	363	struct ocfs2_alloc_context *meta_ac,
	364	struct ocfs2_alloc_context *data_ac)
	365	{
	366	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	367	struct posix_acl *acl = NULL;
6eda3dd3	368	int ret = 0, ret2;
fcefd25a	369	mode_t mode;
89c38bd0 TY	370
	371	if (!S_ISLNK(inode->i_mode)) {
	372	if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) {
	373	acl = ocfs2_get_acl_nolock(dir, ACL_TYPE_DEFAULT,
	374	dir_bh);
	375	if (IS_ERR(acl))
	376	return PTR_ERR(acl);
	377	}
fcefd25a MF	378	if (!acl) {
	379	mode = inode->i_mode & ~current_umask();
	380	ret = ocfs2_acl_set_mode(inode, di_bh, handle, mode);
	381	if (ret) {
	382	mlog_errno(ret);
	383	goto cleanup;
	384	}
	385	}
89c38bd0 TY	386	}
	387	if ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) && acl) {
	388	struct posix_acl *clone;
89c38bd0 TY	389
	390	if (S_ISDIR(inode->i_mode)) {
	391	ret = ocfs2_set_acl(handle, inode, di_bh,
	392	ACL_TYPE_DEFAULT, acl,
	393	meta_ac, data_ac);
	394	if (ret)
	395	goto cleanup;
	396	}
	397	clone = posix_acl_clone(acl, GFP_NOFS);
	398	ret = -ENOMEM;
	399	if (!clone)
	400	goto cleanup;
	401
	402	mode = inode->i_mode;
	403	ret = posix_acl_create_masq(clone, &mode);
	404	if (ret >= 0) {
6eda3dd3 TY	405	ret2 = ocfs2_acl_set_mode(inode, di_bh, handle, mode);
	406	if (ret2) {
	407	mlog_errno(ret2);
	408	ret = ret2;
	409	goto cleanup;
	410	}
89c38bd0 TY	411	if (ret > 0) {
	412	ret = ocfs2_set_acl(handle, inode,
	413	di_bh, ACL_TYPE_ACCESS,
	414	clone, meta_ac, data_ac);
	415	}
	416	}
	417	posix_acl_release(clone);
	418	}
	419	cleanup:
	420	posix_acl_release(acl);
	421	return ret;
	422	}
	423
431547b3	424	static size_t ocfs2_xattr_list_acl_access(struct dentry *dentry,
929fb014 TY	425	char *list,
	426	size_t list_len,
	427	const char *name,
431547b3 CH	428	size_t name_len,
431547b3 CH	429	int type)
929fb014	430	{
431547b3	431	struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
929fb014 TY	432	const size_t size = sizeof(POSIX_ACL_XATTR_ACCESS);
	433
	434	if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
	435	return 0;
	436
	437	if (list && size <= list_len)
	438	memcpy(list, POSIX_ACL_XATTR_ACCESS, size);
	439	return size;
	440	}
	441
431547b3	442	static size_t ocfs2_xattr_list_acl_default(struct dentry *dentry,
929fb014 TY	443	char *list,
	444	size_t list_len,
	445	const char *name,
431547b3 CH	446	size_t name_len,
431547b3 CH	447	int type)
929fb014	448	{
431547b3	449	struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
929fb014 TY	450	const size_t size = sizeof(POSIX_ACL_XATTR_DEFAULT);
	451
	452	if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
	453	return 0;
	454
	455	if (list && size <= list_len)
	456	memcpy(list, POSIX_ACL_XATTR_DEFAULT, size);
	457	return size;
	458	}
	459
431547b3 CH	460	static int ocfs2_xattr_get_acl(struct dentry dentry, const char name,
431547b3 CH	461	void *buffer, size_t size, int type)
929fb014	462	{
431547b3	463	struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
929fb014 TY	464	struct posix_acl *acl;
	465	int ret;
	466
431547b3 CH	467	if (strcmp(name, "") != 0)
431547b3 CH	468	return -EINVAL;
929fb014 TY	469	if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
	470	return -EOPNOTSUPP;
	471
431547b3	472	acl = ocfs2_get_acl(dentry->d_inode, type);
929fb014 TY	473	if (IS_ERR(acl))
	474	return PTR_ERR(acl);
	475	if (acl == NULL)
	476	return -ENODATA;
	477	ret = posix_acl_to_xattr(acl, buffer, size);
	478	posix_acl_release(acl);
	479
	480	return ret;
	481	}
	482
431547b3 CH	483	static int ocfs2_xattr_set_acl(struct dentry dentry, const char name,
431547b3 CH	484	const void *value, size_t size, int flags, int type)
929fb014	485	{
431547b3	486	struct inode *inode = dentry->d_inode;
929fb014 TY	487	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	488	struct posix_acl *acl;
	489	int ret = 0;
	490
431547b3 CH	491	if (strcmp(name, "") != 0)
431547b3 CH	492	return -EINVAL;
929fb014 TY	493	if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
	494	return -EOPNOTSUPP;
	495
	496	if (!is_owner_or_cap(inode))
	497	return -EPERM;
	498
	499	if (value) {
	500	acl = posix_acl_from_xattr(value, size);
	501	if (IS_ERR(acl))
	502	return PTR_ERR(acl);
	503	else if (acl) {
	504	ret = posix_acl_valid(acl);
	505	if (ret)
	506	goto cleanup;
	507	}
	508	} else
	509	acl = NULL;
	510
	511	ret = ocfs2_set_acl(NULL, inode, NULL, type, acl, NULL, NULL);
	512
	513	cleanup:
	514	posix_acl_release(acl);
	515	return ret;
	516	}
	517
537d81ca	518	const struct xattr_handler ocfs2_xattr_acl_access_handler = {
929fb014	519	.prefix = POSIX_ACL_XATTR_ACCESS,
431547b3	520	.flags = ACL_TYPE_ACCESS,
929fb014	521	.list = ocfs2_xattr_list_acl_access,
431547b3 CH	522	.get = ocfs2_xattr_get_acl,
431547b3 CH	523	.set = ocfs2_xattr_set_acl,
929fb014 TY	524	};
929fb014 TY	525
537d81ca	526	const struct xattr_handler ocfs2_xattr_acl_default_handler = {
929fb014	527	.prefix = POSIX_ACL_XATTR_DEFAULT,
431547b3	528	.flags = ACL_TYPE_DEFAULT,
929fb014	529	.list = ocfs2_xattr_list_acl_default,
431547b3 CH	530	.get = ocfs2_xattr_get_acl,
431547b3 CH	531	.set = ocfs2_xattr_set_acl,
929fb014	532	};