fs/f2fs/acl.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * fs/f2fs/acl.c
  *
  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
  *             http://www.samsung.com/
  *
  * Portions of this code from linux/fs/ext2/acl.c
  *
  * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de>
  */
 #include <linux/f2fs_fs.h>
 #include "f2fs.h"
 #include "xattr.h"
 #include "acl.h"

 static inline size_t f2fs_acl_size(int count)
 {
 	if (count <= 4) {
 		return sizeof(struct f2fs_acl_header) +
 			count * sizeof(struct f2fs_acl_entry_short);
 	} else {
 		return sizeof(struct f2fs_acl_header) +
 			4 * sizeof(struct f2fs_acl_entry_short) +
 			(count - 4) * sizeof(struct f2fs_acl_entry);
 	}
 }

 static inline int f2fs_acl_count(size_t size)
 {
 	ssize_t s;

 	size -= sizeof(struct f2fs_acl_header);
 	s = size - 4 * sizeof(struct f2fs_acl_entry_short);
 	if (s < 0) {
 		if (size % sizeof(struct f2fs_acl_entry_short))
 			return -1;
 		return size / sizeof(struct f2fs_acl_entry_short);
 	} else {
 		if (s % sizeof(struct f2fs_acl_entry))
 			return -1;
 		return s / sizeof(struct f2fs_acl_entry) + 4;
 	}
 }

 static struct posix_acl *f2fs_acl_from_disk(const char *value, size_t size)
 {
 	int i, count;
 	struct posix_acl *acl;
 	struct f2fs_acl_header *hdr = (struct f2fs_acl_header *)value;
 	struct f2fs_acl_entry *entry = (struct f2fs_acl_entry *)(hdr + 1);
 	const char *end = value + size;

 	if (size < sizeof(struct f2fs_acl_header))
 		return ERR_PTR(-EINVAL);

 	if (hdr->a_version != cpu_to_le32(F2FS_ACL_VERSION))
 		return ERR_PTR(-EINVAL);

 	count = f2fs_acl_count(size);
 	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 (i = 0; i < count; i++) {

 		if ((char *)entry > end)
 			goto fail;

 		acl->a_entries[i].e_tag  = le16_to_cpu(entry->e_tag);
 		acl->a_entries[i].e_perm = le16_to_cpu(entry->e_perm);

 		switch (acl->a_entries[i].e_tag) {
 		case ACL_USER_OBJ:
 		case ACL_GROUP_OBJ:
 		case ACL_MASK:
 		case ACL_OTHER:
 			entry = (struct f2fs_acl_entry *)((char *)entry +
 					sizeof(struct f2fs_acl_entry_short));
 			break;

 		case ACL_USER:
 			acl->a_entries[i].e_uid =
 				make_kuid(&init_user_ns,
 						le32_to_cpu(entry->e_id));
 			entry = (struct f2fs_acl_entry *)((char *)entry +
 					sizeof(struct f2fs_acl_entry));
 			break;
 		case ACL_GROUP:
 			acl->a_entries[i].e_gid =
 				make_kgid(&init_user_ns,
 						le32_to_cpu(entry->e_id));
 			entry = (struct f2fs_acl_entry *)((char *)entry +
 					sizeof(struct f2fs_acl_entry));
 			break;
 		default:
 			goto fail;
 		}
 	}
 	if ((char *)entry != end)
 		goto fail;
 	return acl;
 fail:
 	posix_acl_release(acl);
 	return ERR_PTR(-EINVAL);
 }

 static void *f2fs_acl_to_disk(struct f2fs_sb_info *sbi,
 				const struct posix_acl *acl, size_t *size)
 {
 	struct f2fs_acl_header *f2fs_acl;
 	struct f2fs_acl_entry *entry;
 	int i;

 	f2fs_acl = f2fs_kmalloc(sbi, sizeof(struct f2fs_acl_header) +
 			acl->a_count * sizeof(struct f2fs_acl_entry),
 			GFP_NOFS);
 	if (!f2fs_acl)
 		return ERR_PTR(-ENOMEM);

 	f2fs_acl->a_version = cpu_to_le32(F2FS_ACL_VERSION);
 	entry = (struct f2fs_acl_entry *)(f2fs_acl + 1);

 	for (i = 0; i < acl->a_count; i++) {

 		entry->e_tag  = cpu_to_le16(acl->a_entries[i].e_tag);
 		entry->e_perm = cpu_to_le16(acl->a_entries[i].e_perm);

 		switch (acl->a_entries[i].e_tag) {
 		case ACL_USER:
 			entry->e_id = cpu_to_le32(
 					from_kuid(&init_user_ns,
 						acl->a_entries[i].e_uid));
 			entry = (struct f2fs_acl_entry *)((char *)entry +
 					sizeof(struct f2fs_acl_entry));
 			break;
 		case ACL_GROUP:
 			entry->e_id = cpu_to_le32(
 					from_kgid(&init_user_ns,
 						acl->a_entries[i].e_gid));
 			entry = (struct f2fs_acl_entry *)((char *)entry +
 					sizeof(struct f2fs_acl_entry));
 			break;
 		case ACL_USER_OBJ:
 		case ACL_GROUP_OBJ:
 		case ACL_MASK:
 		case ACL_OTHER:
 			entry = (struct f2fs_acl_entry *)((char *)entry +
 					sizeof(struct f2fs_acl_entry_short));
 			break;
 		default:
 			goto fail;
 		}
 	}
 	*size = f2fs_acl_size(acl->a_count);
 	return (void *)f2fs_acl;

 fail:
 	kfree(f2fs_acl);
 	return ERR_PTR(-EINVAL);
 }

 static struct posix_acl *__f2fs_get_acl(struct inode *inode, int type,
 						struct page *dpage)
 {
 	int name_index = F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT;
 	void *value = NULL;
 	struct posix_acl *acl;
 	int retval;

 	if (type == ACL_TYPE_ACCESS)
 		name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS;

 	retval = f2fs_getxattr(inode, name_index, "", NULL, 0, dpage);
 	if (retval > 0) {
 		value = f2fs_kmalloc(F2FS_I_SB(inode), retval, GFP_F2FS_ZERO);
 		if (!value)
 			return ERR_PTR(-ENOMEM);
 		retval = f2fs_getxattr(inode, name_index, "", value,
 							retval, dpage);
 	}

 	if (retval > 0)
 		acl = f2fs_acl_from_disk(value, retval);
 	else if (retval == -ENODATA)
 		acl = NULL;
 	else
 		acl = ERR_PTR(retval);
 	kfree(value);

 	return acl;
 }

 struct posix_acl *f2fs_get_acl(struct inode *inode, int type, bool rcu)
 {
 	if (rcu)
 		return ERR_PTR(-ECHILD);

 	return __f2fs_get_acl(inode, type, NULL);
 }

 static int f2fs_acl_update_mode(struct mnt_idmap *idmap,
 				struct inode *inode, umode_t *mode_p,
 				struct posix_acl **acl)
 {
 	umode_t mode = inode->i_mode;
 	int error;

 	if (is_inode_flag_set(inode, FI_ACL_MODE))
 		mode = F2FS_I(inode)->i_acl_mode;

 	error = posix_acl_equiv_mode(*acl, &mode);
 	if (error < 0)
 		return error;
 	if (error == 0)
 		*acl = NULL;
 	if (!in_group_or_capable(idmap, inode, i_gid_into_vfsgid(idmap, inode)))
 		mode &= ~S_ISGID;
 	*mode_p = mode;
 	return 0;
 }

 static int __f2fs_set_acl(struct mnt_idmap *idmap,
 			struct inode *inode, int type,
 			struct posix_acl *acl, struct page *ipage)
 {
 	int name_index;
 	void *value = NULL;
 	size_t size = 0;
 	int error;
 	umode_t mode = inode->i_mode;

 	switch (type) {
 	case ACL_TYPE_ACCESS:
 		name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS;
 		if (acl && !ipage) {
 			error = f2fs_acl_update_mode(idmap, inode,
 								&mode, &acl);
 			if (error)
 				return error;
 			set_acl_inode(inode, mode);
 		}
 		break;

 	case ACL_TYPE_DEFAULT:
 		name_index = F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT;
 		if (!S_ISDIR(inode->i_mode))
 			return acl ? -EACCES : 0;
 		break;

 	default:
 		return -EINVAL;
 	}

 	if (acl) {
 		value = f2fs_acl_to_disk(F2FS_I_SB(inode), acl, &size);
 		if (IS_ERR(value)) {
 			clear_inode_flag(inode, FI_ACL_MODE);
 			return PTR_ERR(value);
 		}
 	}

 	error = f2fs_setxattr(inode, name_index, "", value, size, ipage, 0);

 	kfree(value);
 	if (!error)
 		set_cached_acl(inode, type, acl);

 	clear_inode_flag(inode, FI_ACL_MODE);
 	return error;
 }

 int f2fs_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
 		 struct posix_acl *acl, int type)
 {
 	struct inode *inode = d_inode(dentry);

 	if (unlikely(f2fs_cp_error(F2FS_I_SB(inode))))
 		return -EIO;

 	return __f2fs_set_acl(idmap, inode, type, acl, NULL);
 }

 /*
  * Most part of f2fs_acl_clone, f2fs_acl_create_masq, f2fs_acl_create
  * are copied from posix_acl.c
  */
 static struct posix_acl *f2fs_acl_clone(const struct posix_acl *acl,
 							gfp_t flags)
 {
 	struct posix_acl *clone = NULL;

 	if (acl) {
 		int size = sizeof(struct posix_acl) + acl->a_count *
 				sizeof(struct posix_acl_entry);
 		clone = kmemdup(acl, size, flags);
 		if (clone)
 			refcount_set(&clone->a_refcount, 1);
 	}
 	return clone;
 }

 static int f2fs_acl_create_masq(struct posix_acl *acl, umode_t *mode_p)
 {
 	struct posix_acl_entry *pa, *pe;
 	struct posix_acl_entry *group_obj = NULL, *mask_obj = NULL;
 	umode_t mode = *mode_p;
 	int not_equiv = 0;

 	/* assert(atomic_read(acl->a_refcount) == 1); */

 	FOREACH_ACL_ENTRY(pa, acl, pe) {
 		switch (pa->e_tag) {
 		case ACL_USER_OBJ:
 			pa->e_perm &= (mode >> 6) | ~S_IRWXO;
 			mode &= (pa->e_perm << 6) | ~S_IRWXU;
 			break;

 		case ACL_USER:
 		case ACL_GROUP:
 			not_equiv = 1;
 			break;

 		case ACL_GROUP_OBJ:
 			group_obj = pa;
 			break;

 		case ACL_OTHER:
 			pa->e_perm &= mode | ~S_IRWXO;
 			mode &= pa->e_perm | ~S_IRWXO;
 			break;

 		case ACL_MASK:
 			mask_obj = pa;
 			not_equiv = 1;
 			break;

 		default:
 			return -EIO;
 		}
 	}

 	if (mask_obj) {
 		mask_obj->e_perm &= (mode >> 3) | ~S_IRWXO;
 		mode &= (mask_obj->e_perm << 3) | ~S_IRWXG;
 	} else {
 		if (!group_obj)
 			return -EIO;
 		group_obj->e_perm &= (mode >> 3) | ~S_IRWXO;
 		mode &= (group_obj->e_perm << 3) | ~S_IRWXG;
 	}

 	*mode_p = (*mode_p & ~S_IRWXUGO) | mode;
 	return not_equiv;
 }

 static int f2fs_acl_create(struct inode *dir, umode_t *mode,
 		struct posix_acl **default_acl, struct posix_acl **acl,
 		struct page *dpage)
 {
 	struct posix_acl *p;
 	struct posix_acl *clone;
 	int ret;

 	*acl = NULL;
 	*default_acl = NULL;

 	if (S_ISLNK(*mode) || !IS_POSIXACL(dir))
 		return 0;

 	p = __f2fs_get_acl(dir, ACL_TYPE_DEFAULT, dpage);
 	if (!p || p == ERR_PTR(-EOPNOTSUPP)) {
 		*mode &= ~current_umask();
 		return 0;
 	}
 	if (IS_ERR(p))
 		return PTR_ERR(p);

 	clone = f2fs_acl_clone(p, GFP_NOFS);
 	if (!clone) {
 		ret = -ENOMEM;
 		goto release_acl;
 	}

 	ret = f2fs_acl_create_masq(clone, mode);
 	if (ret < 0)
 		goto release_clone;

 	if (ret == 0)
 		posix_acl_release(clone);
 	else
 		*acl = clone;

 	if (!S_ISDIR(*mode))
 		posix_acl_release(p);
 	else
 		*default_acl = p;

 	return 0;

 release_clone:
 	posix_acl_release(clone);
 release_acl:
 	posix_acl_release(p);
 	return ret;
 }

 int f2fs_init_acl(struct inode *inode, struct inode *dir, struct page *ipage,
 							struct page *dpage)
 {
 	struct posix_acl *default_acl = NULL, *acl = NULL;
 	int error;

 	error = f2fs_acl_create(dir, &inode->i_mode, &default_acl, &acl, dpage);
 	if (error)
 		return error;

 	f2fs_mark_inode_dirty_sync(inode, true);

 	if (default_acl) {
 		error = __f2fs_set_acl(NULL, inode, ACL_TYPE_DEFAULT, default_acl,
 				       ipage);
 		posix_acl_release(default_acl);
 	} else {
 		inode->i_default_acl = NULL;
 	}
 	if (acl) {
 		if (!error)
 			error = __f2fs_set_acl(NULL, inode, ACL_TYPE_ACCESS, acl,
 					       ipage);
 		posix_acl_release(acl);
 	} else {
 		inode->i_acl = NULL;
 	}

 	return error;
 }
	// SPDX-License-Identifier: GPL-2.0
	/*
	* fs/f2fs/acl.c
	*
	* Copyright (c) 2012 Samsung Electronics Co., Ltd.
	* http://www.samsung.com/
	*
	* Portions of this code from linux/fs/ext2/acl.c
	*
	* Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de>
	*/
	#include <linux/f2fs_fs.h>
	#include "f2fs.h"
	#include "xattr.h"
	#include "acl.h"

	static inline size_t f2fs_acl_size(int count)
	{
	if (count <= 4) {
	return sizeof(struct f2fs_acl_header) +
	count * sizeof(struct f2fs_acl_entry_short);
	} else {
	return sizeof(struct f2fs_acl_header) +
	4 * sizeof(struct f2fs_acl_entry_short) +
	(count - 4) * sizeof(struct f2fs_acl_entry);
	}
	}

	static inline int f2fs_acl_count(size_t size)
	{
	ssize_t s;

	size -= sizeof(struct f2fs_acl_header);
	s = size - 4 * sizeof(struct f2fs_acl_entry_short);
	if (s < 0) {
	if (size % sizeof(struct f2fs_acl_entry_short))
	return -1;
	return size / sizeof(struct f2fs_acl_entry_short);
	} else {
	if (s % sizeof(struct f2fs_acl_entry))
	return -1;
	return s / sizeof(struct f2fs_acl_entry) + 4;
	}
	}

	static struct posix_acl f2fs_acl_from_disk(const char value, size_t size)
	{
	int i, count;
	struct posix_acl *acl;
	struct f2fs_acl_header hdr = (struct f2fs_acl_header )value;
	struct f2fs_acl_entry entry = (struct f2fs_acl_entry )(hdr + 1);
	const char *end = value + size;

	if (size < sizeof(struct f2fs_acl_header))
	return ERR_PTR(-EINVAL);

	if (hdr->a_version != cpu_to_le32(F2FS_ACL_VERSION))
	return ERR_PTR(-EINVAL);

	count = f2fs_acl_count(size);
	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 (i = 0; i < count; i++) {

	if ((char *)entry > end)
	goto fail;

	acl->a_entries[i].e_tag = le16_to_cpu(entry->e_tag);
	acl->a_entries[i].e_perm = le16_to_cpu(entry->e_perm);

	switch (acl->a_entries[i].e_tag) {
	case ACL_USER_OBJ:
	case ACL_GROUP_OBJ:
	case ACL_MASK:
	case ACL_OTHER:
	entry = (struct f2fs_acl_entry )((char )entry +
	sizeof(struct f2fs_acl_entry_short));
	break;

	case ACL_USER:
	acl->a_entries[i].e_uid =
	make_kuid(&init_user_ns,
	le32_to_cpu(entry->e_id));
	entry = (struct f2fs_acl_entry )((char )entry +
	sizeof(struct f2fs_acl_entry));
	break;
	case ACL_GROUP:
	acl->a_entries[i].e_gid =
	make_kgid(&init_user_ns,
	le32_to_cpu(entry->e_id));
	entry = (struct f2fs_acl_entry )((char )entry +
	sizeof(struct f2fs_acl_entry));
	break;
	default:
	goto fail;
	}
	}
	if ((char *)entry != end)
	goto fail;
	return acl;
	fail:
	posix_acl_release(acl);
	return ERR_PTR(-EINVAL);
	}

	static void f2fs_acl_to_disk(struct f2fs_sb_info sbi,
	const struct posix_acl acl, size_t size)
	{
	struct f2fs_acl_header *f2fs_acl;
	struct f2fs_acl_entry *entry;
	int i;

	f2fs_acl = f2fs_kmalloc(sbi, sizeof(struct f2fs_acl_header) +
	acl->a_count * sizeof(struct f2fs_acl_entry),
	GFP_NOFS);
	if (!f2fs_acl)
	return ERR_PTR(-ENOMEM);

	f2fs_acl->a_version = cpu_to_le32(F2FS_ACL_VERSION);
	entry = (struct f2fs_acl_entry *)(f2fs_acl + 1);

	for (i = 0; i < acl->a_count; i++) {

	entry->e_tag = cpu_to_le16(acl->a_entries[i].e_tag);
	entry->e_perm = cpu_to_le16(acl->a_entries[i].e_perm);

	switch (acl->a_entries[i].e_tag) {
	case ACL_USER:
	entry->e_id = cpu_to_le32(
	from_kuid(&init_user_ns,
	acl->a_entries[i].e_uid));
	entry = (struct f2fs_acl_entry )((char )entry +
	sizeof(struct f2fs_acl_entry));
	break;
	case ACL_GROUP:
	entry->e_id = cpu_to_le32(
	from_kgid(&init_user_ns,
	acl->a_entries[i].e_gid));
	entry = (struct f2fs_acl_entry )((char )entry +
	sizeof(struct f2fs_acl_entry));
	break;
	case ACL_USER_OBJ:
	case ACL_GROUP_OBJ:
	case ACL_MASK:
	case ACL_OTHER:
	entry = (struct f2fs_acl_entry )((char )entry +
	sizeof(struct f2fs_acl_entry_short));
	break;
	default:
	goto fail;
	}
	}
	*size = f2fs_acl_size(acl->a_count);
	return (void *)f2fs_acl;

	fail:
	kfree(f2fs_acl);
	return ERR_PTR(-EINVAL);
	}

	static struct posix_acl __f2fs_get_acl(struct inode inode, int type,
	struct page *dpage)
	{
	int name_index = F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT;
	void *value = NULL;
	struct posix_acl *acl;
	int retval;

	if (type == ACL_TYPE_ACCESS)
	name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS;

	retval = f2fs_getxattr(inode, name_index, "", NULL, 0, dpage);
	if (retval > 0) {
	value = f2fs_kmalloc(F2FS_I_SB(inode), retval, GFP_F2FS_ZERO);
	if (!value)
	return ERR_PTR(-ENOMEM);
	retval = f2fs_getxattr(inode, name_index, "", value,
	retval, dpage);
	}

	if (retval > 0)
	acl = f2fs_acl_from_disk(value, retval);
	else if (retval == -ENODATA)
	acl = NULL;
	else
	acl = ERR_PTR(retval);
	kfree(value);

	return acl;
	}

	struct posix_acl f2fs_get_acl(struct inode inode, int type, bool rcu)
	{
	if (rcu)
	return ERR_PTR(-ECHILD);

	return __f2fs_get_acl(inode, type, NULL);
	}

	static int f2fs_acl_update_mode(struct mnt_idmap *idmap,
	struct inode inode, umode_t mode_p,
	struct posix_acl **acl)
	{
	umode_t mode = inode->i_mode;
	int error;

	if (is_inode_flag_set(inode, FI_ACL_MODE))
	mode = F2FS_I(inode)->i_acl_mode;

	error = posix_acl_equiv_mode(*acl, &mode);
	if (error < 0)
	return error;
	if (error == 0)
	*acl = NULL;
	if (!in_group_or_capable(idmap, inode, i_gid_into_vfsgid(idmap, inode)))
	mode &= ~S_ISGID;
	*mode_p = mode;
	return 0;
	}

	static int __f2fs_set_acl(struct mnt_idmap *idmap,
	struct inode *inode, int type,
	struct posix_acl acl, struct page ipage)
	{
	int name_index;
	void *value = NULL;
	size_t size = 0;
	int error;
	umode_t mode = inode->i_mode;

	switch (type) {
	case ACL_TYPE_ACCESS:
	name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS;
	if (acl && !ipage) {
	error = f2fs_acl_update_mode(idmap, inode,
	&mode, &acl);
	if (error)
	return error;
	set_acl_inode(inode, mode);
	}
	break;

	case ACL_TYPE_DEFAULT:
	name_index = F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT;
	if (!S_ISDIR(inode->i_mode))
	return acl ? -EACCES : 0;
	break;

	default:
	return -EINVAL;
	}

	if (acl) {
	value = f2fs_acl_to_disk(F2FS_I_SB(inode), acl, &size);
	if (IS_ERR(value)) {
	clear_inode_flag(inode, FI_ACL_MODE);
	return PTR_ERR(value);
	}
	}

	error = f2fs_setxattr(inode, name_index, "", value, size, ipage, 0);

	kfree(value);
	if (!error)
	set_cached_acl(inode, type, acl);

	clear_inode_flag(inode, FI_ACL_MODE);
	return error;
	}

	int f2fs_set_acl(struct mnt_idmap idmap, struct dentry dentry,
	struct posix_acl *acl, int type)
	{
	struct inode *inode = d_inode(dentry);

	if (unlikely(f2fs_cp_error(F2FS_I_SB(inode))))
	return -EIO;

	return __f2fs_set_acl(idmap, inode, type, acl, NULL);
	}

	/*
	* Most part of f2fs_acl_clone, f2fs_acl_create_masq, f2fs_acl_create
	* are copied from posix_acl.c
	*/
	static struct posix_acl f2fs_acl_clone(const struct posix_acl acl,
	gfp_t flags)
	{
	struct posix_acl *clone = NULL;

	if (acl) {
	int size = sizeof(struct posix_acl) + acl->a_count *
	sizeof(struct posix_acl_entry);
	clone = kmemdup(acl, size, flags);
	if (clone)
	refcount_set(&clone->a_refcount, 1);
	}
	return clone;
	}

	static int f2fs_acl_create_masq(struct posix_acl acl, umode_t mode_p)
	{
	struct posix_acl_entry pa, pe;
	struct posix_acl_entry group_obj = NULL, mask_obj = NULL;
	umode_t mode = *mode_p;
	int not_equiv = 0;

	/* assert(atomic_read(acl->a_refcount) == 1); */

	FOREACH_ACL_ENTRY(pa, acl, pe) {
	switch (pa->e_tag) {
	case ACL_USER_OBJ:
	pa->e_perm &= (mode >> 6) \| ~S_IRWXO;
	mode &= (pa->e_perm << 6) \| ~S_IRWXU;
	break;

	case ACL_USER:
	case ACL_GROUP:
	not_equiv = 1;
	break;

	case ACL_GROUP_OBJ:
	group_obj = pa;
	break;

	case ACL_OTHER:
	pa->e_perm &= mode \| ~S_IRWXO;
	mode &= pa->e_perm \| ~S_IRWXO;
	break;

	case ACL_MASK:
	mask_obj = pa;
	not_equiv = 1;
	break;

	default:
	return -EIO;
	}
	}

	if (mask_obj) {
	mask_obj->e_perm &= (mode >> 3) \| ~S_IRWXO;
	mode &= (mask_obj->e_perm << 3) \| ~S_IRWXG;
	} else {
	if (!group_obj)
	return -EIO;
	group_obj->e_perm &= (mode >> 3) \| ~S_IRWXO;
	mode &= (group_obj->e_perm << 3) \| ~S_IRWXG;
	}

	mode_p = (mode_p & ~S_IRWXUGO) \| mode;
	return not_equiv;
	}

	static int f2fs_acl_create(struct inode dir, umode_t mode,
	struct posix_acl default_acl, struct posix_acl acl,
	struct page *dpage)
	{
	struct posix_acl *p;
	struct posix_acl *clone;
	int ret;

	*acl = NULL;
	*default_acl = NULL;

	if (S_ISLNK(*mode) \|\| !IS_POSIXACL(dir))
	return 0;

	p = __f2fs_get_acl(dir, ACL_TYPE_DEFAULT, dpage);
	if (!p \|\| p == ERR_PTR(-EOPNOTSUPP)) {
	*mode &= ~current_umask();
	return 0;
	}
	if (IS_ERR(p))
	return PTR_ERR(p);

	clone = f2fs_acl_clone(p, GFP_NOFS);
	if (!clone) {
	ret = -ENOMEM;
	goto release_acl;
	}

	ret = f2fs_acl_create_masq(clone, mode);
	if (ret < 0)
	goto release_clone;

	if (ret == 0)
	posix_acl_release(clone);
	else
	*acl = clone;

	if (!S_ISDIR(*mode))
	posix_acl_release(p);
	else
	*default_acl = p;

	return 0;

	release_clone:
	posix_acl_release(clone);
	release_acl:
	posix_acl_release(p);
	return ret;
	}

	int f2fs_init_acl(struct inode inode, struct inode dir, struct page *ipage,
	struct page *dpage)
	{
	struct posix_acl default_acl = NULL, acl = NULL;
	int error;

	error = f2fs_acl_create(dir, &inode->i_mode, &default_acl, &acl, dpage);
	if (error)
	return error;

	f2fs_mark_inode_dirty_sync(inode, true);

	if (default_acl) {
	error = __f2fs_set_acl(NULL, inode, ACL_TYPE_DEFAULT, default_acl,
	ipage);
	posix_acl_release(default_acl);
	} else {
	inode->i_default_acl = NULL;
	}
	if (acl) {
	if (!error)
	error = __f2fs_set_acl(NULL, inode, ACL_TYPE_ACCESS, acl,
	ipage);
	posix_acl_release(acl);
	} else {
	inode->i_acl = NULL;
	}

	return error;
	}