[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, <[email protected]>
 *
 * 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;
	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;
}

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, <[email protected]>
	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;
	212	di->i_mode = cpu_to_le16(inode->i_mode);
	213
	214	ocfs2_journal_dirty(handle, di_bh);
	215
	216	out_commit:
	217	if (commit_handle)
	218	ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
	219	out_brelse:
	220	brelse(di_bh);
	221	out:
	222	return ret;
	223	}
	224
929fb014 TY	225	/*
	226	* Set the access or default ACL of an inode.
	227	*/
	228	static int ocfs2_set_acl(handle_t *handle,
	229	struct inode *inode,
	230	struct buffer_head *di_bh,
	231	int type,
	232	struct posix_acl *acl,
	233	struct ocfs2_alloc_context *meta_ac,
	234	struct ocfs2_alloc_context *data_ac)
	235	{
	236	int name_index;
	237	void *value = NULL;
	238	size_t size = 0;
	239	int ret;
	240
	241	if (S_ISLNK(inode->i_mode))
	242	return -EOPNOTSUPP;
	243
	244	switch (type) {
	245	case ACL_TYPE_ACCESS:
	246	name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS;
	247	if (acl) {
	248	mode_t mode = inode->i_mode;
	249	ret = posix_acl_equiv_mode(acl, &mode);
	250	if (ret < 0)
	251	return ret;
	252	else {
929fb014 TY	253	if (ret == 0)
929fb014 TY	254	acl = NULL;
fcefd25a MF	255
	256	ret = ocfs2_acl_set_mode(inode, di_bh,
	257	handle, mode);
	258	if (ret)
	259	return ret;
	260
929fb014 TY	261	}
	262	}
	263	break;
	264	case ACL_TYPE_DEFAULT:
	265	name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
	266	if (!S_ISDIR(inode->i_mode))
	267	return acl ? -EACCES : 0;
	268	break;
	269	default:
	270	return -EINVAL;
	271	}
	272
	273	if (acl) {
	274	value = ocfs2_acl_to_xattr(acl, &size);
	275	if (IS_ERR(value))
	276	return (int)PTR_ERR(value);
	277	}
	278
	279	if (handle)
	280	ret = ocfs2_xattr_set_handle(handle, inode, di_bh, name_index,
	281	"", value, size, 0,
	282	meta_ac, data_ac);
	283	else
	284	ret = ocfs2_xattr_set(inode, name_index, "", value, size, 0);
	285
	286	kfree(value);
	287
	288	return ret;
	289	}
	290
23fc2702 TY	291	int ocfs2_check_acl(struct inode *inode, int mask)
	292	{
	293	struct posix_acl *acl = ocfs2_get_acl(inode, ACL_TYPE_ACCESS);
	294
	295	if (IS_ERR(acl))
	296	return PTR_ERR(acl);
	297	if (acl) {
	298	int ret = posix_acl_permission(inode, acl, mask);
	299	posix_acl_release(acl);
	300	return ret;
	301	}
	302
	303	return -EAGAIN;
	304	}
	305
060bc66d TY	306	int ocfs2_acl_chmod(struct inode *inode)
	307	{
	308	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	309	struct posix_acl acl, clone;
	310	int ret;
	311
	312	if (S_ISLNK(inode->i_mode))
	313	return -EOPNOTSUPP;
	314
	315	if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
	316	return 0;
	317
	318	acl = ocfs2_get_acl(inode, ACL_TYPE_ACCESS);
	319	if (IS_ERR(acl) \|\| !acl)
	320	return PTR_ERR(acl);
	321	clone = posix_acl_clone(acl, GFP_KERNEL);
	322	posix_acl_release(acl);
	323	if (!clone)
	324	return -ENOMEM;
	325	ret = posix_acl_chmod_masq(clone, inode->i_mode);
	326	if (!ret)
	327	ret = ocfs2_set_acl(NULL, inode, NULL, ACL_TYPE_ACCESS,
	328	clone, NULL, NULL);
	329	posix_acl_release(clone);
	330	return ret;
	331	}
	332
89c38bd0 TY	333	/*
	334	* Initialize the ACLs of a new inode. If parent directory has default ACL,
	335	* then clone to new inode. Called from ocfs2_mknod.
	336	*/
	337	int ocfs2_init_acl(handle_t *handle,
	338	struct inode *inode,
	339	struct inode *dir,
	340	struct buffer_head *di_bh,
	341	struct buffer_head *dir_bh,
	342	struct ocfs2_alloc_context *meta_ac,
	343	struct ocfs2_alloc_context *data_ac)
	344	{
	345	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	346	struct posix_acl *acl = NULL;
	347	int ret = 0;
fcefd25a	348	mode_t mode;
89c38bd0 TY	349
	350	if (!S_ISLNK(inode->i_mode)) {
	351	if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) {
	352	acl = ocfs2_get_acl_nolock(dir, ACL_TYPE_DEFAULT,
	353	dir_bh);
	354	if (IS_ERR(acl))
	355	return PTR_ERR(acl);
	356	}
fcefd25a MF	357	if (!acl) {
	358	mode = inode->i_mode & ~current_umask();
	359	ret = ocfs2_acl_set_mode(inode, di_bh, handle, mode);
	360	if (ret) {
	361	mlog_errno(ret);
	362	goto cleanup;
	363	}
	364	}
89c38bd0 TY	365	}
	366	if ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) && acl) {
	367	struct posix_acl *clone;
89c38bd0 TY	368
	369	if (S_ISDIR(inode->i_mode)) {
	370	ret = ocfs2_set_acl(handle, inode, di_bh,
	371	ACL_TYPE_DEFAULT, acl,
	372	meta_ac, data_ac);
	373	if (ret)
	374	goto cleanup;
	375	}
	376	clone = posix_acl_clone(acl, GFP_NOFS);
	377	ret = -ENOMEM;
	378	if (!clone)
	379	goto cleanup;
	380
	381	mode = inode->i_mode;
	382	ret = posix_acl_create_masq(clone, &mode);
	383	if (ret >= 0) {
fcefd25a	384	ret = ocfs2_acl_set_mode(inode, di_bh, handle, mode);
89c38bd0 TY	385	if (ret > 0) {
	386	ret = ocfs2_set_acl(handle, inode,
	387	di_bh, ACL_TYPE_ACCESS,
	388	clone, meta_ac, data_ac);
	389	}
	390	}
	391	posix_acl_release(clone);
	392	}
	393	cleanup:
	394	posix_acl_release(acl);
	395	return ret;
	396	}
	397
431547b3	398	static size_t ocfs2_xattr_list_acl_access(struct dentry *dentry,
929fb014 TY	399	char *list,
	400	size_t list_len,
	401	const char *name,
431547b3 CH	402	size_t name_len,
431547b3 CH	403	int type)
929fb014	404	{
431547b3	405	struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
929fb014 TY	406	const size_t size = sizeof(POSIX_ACL_XATTR_ACCESS);
	407
	408	if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
	409	return 0;
	410
	411	if (list && size <= list_len)
	412	memcpy(list, POSIX_ACL_XATTR_ACCESS, size);
	413	return size;
	414	}
	415
431547b3	416	static size_t ocfs2_xattr_list_acl_default(struct dentry *dentry,
929fb014 TY	417	char *list,
	418	size_t list_len,
	419	const char *name,
431547b3 CH	420	size_t name_len,
431547b3 CH	421	int type)
929fb014	422	{
431547b3	423	struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
929fb014 TY	424	const size_t size = sizeof(POSIX_ACL_XATTR_DEFAULT);
	425
	426	if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
	427	return 0;
	428
	429	if (list && size <= list_len)
	430	memcpy(list, POSIX_ACL_XATTR_DEFAULT, size);
	431	return size;
	432	}
	433
431547b3 CH	434	static int ocfs2_xattr_get_acl(struct dentry dentry, const char name,
431547b3 CH	435	void *buffer, size_t size, int type)
929fb014	436	{
431547b3	437	struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
929fb014 TY	438	struct posix_acl *acl;
	439	int ret;
	440
431547b3 CH	441	if (strcmp(name, "") != 0)
431547b3 CH	442	return -EINVAL;
929fb014 TY	443	if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
	444	return -EOPNOTSUPP;
	445
431547b3	446	acl = ocfs2_get_acl(dentry->d_inode, type);
929fb014 TY	447	if (IS_ERR(acl))
	448	return PTR_ERR(acl);
	449	if (acl == NULL)
	450	return -ENODATA;
	451	ret = posix_acl_to_xattr(acl, buffer, size);
	452	posix_acl_release(acl);
	453
	454	return ret;
	455	}
	456
431547b3 CH	457	static int ocfs2_xattr_set_acl(struct dentry dentry, const char name,
431547b3 CH	458	const void *value, size_t size, int flags, int type)
929fb014	459	{
431547b3	460	struct inode *inode = dentry->d_inode;
929fb014 TY	461	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	462	struct posix_acl *acl;
	463	int ret = 0;
	464
431547b3 CH	465	if (strcmp(name, "") != 0)
431547b3 CH	466	return -EINVAL;
929fb014 TY	467	if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
	468	return -EOPNOTSUPP;
	469
	470	if (!is_owner_or_cap(inode))
	471	return -EPERM;
	472
	473	if (value) {
	474	acl = posix_acl_from_xattr(value, size);
	475	if (IS_ERR(acl))
	476	return PTR_ERR(acl);
	477	else if (acl) {
	478	ret = posix_acl_valid(acl);
	479	if (ret)
	480	goto cleanup;
	481	}
	482	} else
	483	acl = NULL;
	484
	485	ret = ocfs2_set_acl(NULL, inode, NULL, type, acl, NULL, NULL);
	486
	487	cleanup:
	488	posix_acl_release(acl);
	489	return ret;
	490	}
	491
537d81ca	492	const struct xattr_handler ocfs2_xattr_acl_access_handler = {
929fb014	493	.prefix = POSIX_ACL_XATTR_ACCESS,
431547b3	494	.flags = ACL_TYPE_ACCESS,
929fb014	495	.list = ocfs2_xattr_list_acl_access,
431547b3 CH	496	.get = ocfs2_xattr_get_acl,
431547b3 CH	497	.set = ocfs2_xattr_set_acl,
929fb014 TY	498	};
929fb014 TY	499
537d81ca	500	const struct xattr_handler ocfs2_xattr_acl_default_handler = {
929fb014	501	.prefix = POSIX_ACL_XATTR_DEFAULT,
431547b3	502	.flags = ACL_TYPE_DEFAULT,
929fb014	503	.list = ocfs2_xattr_list_acl_default,
431547b3 CH	504	.get = ocfs2_xattr_get_acl,
431547b3 CH	505	.set = ocfs2_xattr_set_acl,
929fb014	506	};