fs/ext2/acl.c - kernel/windcharger - Git at Google

 /*
  * linux/fs/ext2/acl.c
  *
  * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de>
  */

 #include <linux/capability.h>
 #include <linux/init.h>
 #include <linux/sched.h>
 #include <linux/slab.h>
 #include <linux/fs.h>
 #include "ext2.h"
 #include "xattr.h"
 #include "acl.h"

 /*
  * Convert from filesystem to in-memory representation.
  */
 static struct posix_acl *
 ext2_acl_from_disk(const void *value, size_t size)
 {
 	const char *end = (char *)value + size;
 	int n, count;
 	struct posix_acl *acl;

 	if (!value)
 		return NULL;
 	if (size < sizeof(ext2_acl_header))
 		 return ERR_PTR(-EINVAL);
 	if (((ext2_acl_header *)value)->a_version !=
 	    cpu_to_le32(EXT2_ACL_VERSION))
 		return ERR_PTR(-EINVAL);
 	value = (char *)value + sizeof(ext2_acl_header);
 	count = ext2_acl_count(size);
 	if (count < 0)
 		return ERR_PTR(-EINVAL);
 	if (count == 0)
 		return NULL;
 	acl = posix_acl_alloc(count, GFP_KERNEL);
 	if (!acl)
 		return ERR_PTR(-ENOMEM);
 	for (n=0; n < count; n++) {
 		ext2_acl_entry *entry =
 			(ext2_acl_entry *)value;
 		if ((char *)value + sizeof(ext2_acl_entry_short) > end)
 			goto fail;
 		acl->a_entries[n].e_tag  = le16_to_cpu(entry->e_tag);
 		acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm);
 		switch(acl->a_entries[n].e_tag) {
 			case ACL_USER_OBJ:
 			case ACL_GROUP_OBJ:
 			case ACL_MASK:
 			case ACL_OTHER:
 				value = (char *)value +
 					sizeof(ext2_acl_entry_short);
 				acl->a_entries[n].e_id = ACL_UNDEFINED_ID;
 				break;

 			case ACL_USER:
 			case ACL_GROUP:
 				value = (char *)value + sizeof(ext2_acl_entry);
 				if ((char *)value > end)
 					goto fail;
 				acl->a_entries[n].e_id =
 					le32_to_cpu(entry->e_id);
 				break;

 			default:
 				goto fail;
 		}
 	}
 	if (value != end)
 		goto fail;
 	return acl;

 fail:
 	posix_acl_release(acl);
 	return ERR_PTR(-EINVAL);
 }

 /*
  * Convert from in-memory to filesystem representation.
  */
 static void *
 ext2_acl_to_disk(const struct posix_acl *acl, size_t *size)
 {
 	ext2_acl_header *ext_acl;
 	char *e;
 	size_t n;

 	*size = ext2_acl_size(acl->a_count);
 	ext_acl = kmalloc(sizeof(ext2_acl_header) + acl->a_count *
 			sizeof(ext2_acl_entry), GFP_KERNEL);
 	if (!ext_acl)
 		return ERR_PTR(-ENOMEM);
 	ext_acl->a_version = cpu_to_le32(EXT2_ACL_VERSION);
 	e = (char *)ext_acl + sizeof(ext2_acl_header);
 	for (n=0; n < acl->a_count; n++) {
 		ext2_acl_entry *entry = (ext2_acl_entry *)e;
 		entry->e_tag  = cpu_to_le16(acl->a_entries[n].e_tag);
 		entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm);
 		switch(acl->a_entries[n].e_tag) {
 			case ACL_USER:
 			case ACL_GROUP:
 				entry->e_id =
 					cpu_to_le32(acl->a_entries[n].e_id);
 				e += sizeof(ext2_acl_entry);
 				break;

 			case ACL_USER_OBJ:
 			case ACL_GROUP_OBJ:
 			case ACL_MASK:
 			case ACL_OTHER:
 				e += sizeof(ext2_acl_entry_short);
 				break;

 			default:
 				goto fail;
 		}
 	}
 	return (char *)ext_acl;

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

 /*
  * inode->i_mutex: don't care
  */
 struct posix_acl *
 ext2_get_acl(struct inode *inode, int type)
 {
 	int name_index;
 	char *value = NULL;
 	struct posix_acl *acl;
 	int retval;

 	if (!test_opt(inode->i_sb, POSIX_ACL))
 		return NULL;

 	acl = get_cached_acl(inode, type);
 	if (acl != ACL_NOT_CACHED)
 		return acl;

 	switch (type) {
 	case ACL_TYPE_ACCESS:
 		name_index = EXT2_XATTR_INDEX_POSIX_ACL_ACCESS;
 		break;
 	case ACL_TYPE_DEFAULT:
 		name_index = EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT;
 		break;
 	default:
 		BUG();
 	}
 	retval = ext2_xattr_get(inode, name_index, "", NULL, 0);
 	if (retval > 0) {
 		value = kmalloc(retval, GFP_KERNEL);
 		if (!value)
 			return ERR_PTR(-ENOMEM);
 		retval = ext2_xattr_get(inode, name_index, "", value, retval);
 	}
 	if (retval > 0)
 		acl = ext2_acl_from_disk(value, retval);
 	else if (retval == -ENODATA || retval == -ENOSYS)
 		acl = NULL;
 	else
 		acl = ERR_PTR(retval);
 	kfree(value);

 	if (!IS_ERR(acl))
 		set_cached_acl(inode, type, acl);

 	return acl;
 }

 /*
  * inode->i_mutex: down
  */
 static int
 ext2_set_acl(struct inode *inode, int type, struct posix_acl *acl)
 {
 	int name_index;
 	void *value = NULL;
 	size_t size = 0;
 	int error;

 	if (S_ISLNK(inode->i_mode))
 		return -EOPNOTSUPP;
 	if (!test_opt(inode->i_sb, POSIX_ACL))
 		return 0;

 	switch(type) {
 		case ACL_TYPE_ACCESS:
 			name_index = EXT2_XATTR_INDEX_POSIX_ACL_ACCESS;
 			if (acl) {
 				error = posix_acl_equiv_mode(acl, &inode->i_mode);
 				if (error < 0)
 					return error;
 				else {
 					inode->i_ctime = CURRENT_TIME_SEC;
 					mark_inode_dirty(inode);
 					if (error == 0)
 						acl = NULL;
 				}
 			}
 			break;

 		case ACL_TYPE_DEFAULT:
 			name_index = EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT;
 			if (!S_ISDIR(inode->i_mode))
 				return acl ? -EACCES : 0;
 			break;

 		default:
 			return -EINVAL;
 	}
  	if (acl) {
 		value = ext2_acl_to_disk(acl, &size);
 		if (IS_ERR(value))
 			return (int)PTR_ERR(value);
 	}

 	error = ext2_xattr_set(inode, name_index, "", value, size, 0);

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

 /*
  * Initialize the ACLs of a new inode. Called from ext2_new_inode.
  *
  * dir->i_mutex: down
  * inode->i_mutex: up (access to inode is still exclusive)
  */
 int
 ext2_init_acl(struct inode *inode, struct inode *dir)
 {
 	struct posix_acl *acl = NULL;
 	int error = 0;

 	if (!S_ISLNK(inode->i_mode)) {
 		if (test_opt(dir->i_sb, POSIX_ACL)) {
 			acl = ext2_get_acl(dir, ACL_TYPE_DEFAULT);
 			if (IS_ERR(acl))
 				return PTR_ERR(acl);
 		}
 		if (!acl)
 			inode->i_mode &= ~current_umask();
 	}
 	if (test_opt(inode->i_sb, POSIX_ACL) && acl) {
 		if (S_ISDIR(inode->i_mode)) {
 			error = ext2_set_acl(inode, ACL_TYPE_DEFAULT, acl);
 			if (error)
 				goto cleanup;
 		}
 		error = posix_acl_create(&acl, GFP_KERNEL, &inode->i_mode);
 		if (error < 0)
 			return error;
 		if (error > 0) {
 			/* This is an extended ACL */
 			error = ext2_set_acl(inode, ACL_TYPE_ACCESS, acl);
 		}
 	}
 cleanup:
        posix_acl_release(acl);
        return error;
 }

 /*
  * Does chmod for an inode that may have an Access Control List. The
  * inode->i_mode field must be updated to the desired value by the caller
  * before calling this function.
  * Returns 0 on success, or a negative error number.
  *
  * We change the ACL rather than storing some ACL entries in the file
  * mode permission bits (which would be more efficient), because that
  * would break once additional permissions (like  ACL_APPEND, ACL_DELETE
  * for directories) are added. There are no more bits available in the
  * file mode.
  *
  * inode->i_mutex: down
  */
 int
 ext2_acl_chmod(struct inode *inode)
 {
 	struct posix_acl *acl;
         int error;

 	if (!test_opt(inode->i_sb, POSIX_ACL))
 		return 0;
 	if (S_ISLNK(inode->i_mode))
 		return -EOPNOTSUPP;
 	acl = ext2_get_acl(inode, ACL_TYPE_ACCESS);
 	if (IS_ERR(acl) || !acl)
 		return PTR_ERR(acl);
 	error = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
 	if (error)
 		return error;
 	error = ext2_set_acl(inode, ACL_TYPE_ACCESS, acl);
 	posix_acl_release(acl);
 	return error;
 }

 /*
  * Extended attribut handlers
  */
 static size_t
 ext2_xattr_list_acl_access(struct dentry *dentry, char *list, size_t list_size,
 			   const char *name, size_t name_len, int type)
 {
 	const size_t size = sizeof(POSIX_ACL_XATTR_ACCESS);

 	if (!test_opt(dentry->d_sb, POSIX_ACL))
 		return 0;
 	if (list && size <= list_size)
 		memcpy(list, POSIX_ACL_XATTR_ACCESS, size);
 	return size;
 }

 static size_t
 ext2_xattr_list_acl_default(struct dentry *dentry, char *list, size_t list_size,
 			    const char *name, size_t name_len, int type)
 {
 	const size_t size = sizeof(POSIX_ACL_XATTR_DEFAULT);

 	if (!test_opt(dentry->d_sb, POSIX_ACL))
 		return 0;
 	if (list && size <= list_size)
 		memcpy(list, POSIX_ACL_XATTR_DEFAULT, size);
 	return size;
 }

 static int
 ext2_xattr_get_acl(struct dentry *dentry, const char *name, void *buffer,
 		   size_t size, int type)
 {
 	struct posix_acl *acl;
 	int error;

 	if (strcmp(name, "") != 0)
 		return -EINVAL;
 	if (!test_opt(dentry->d_sb, POSIX_ACL))
 		return -EOPNOTSUPP;

 	acl = ext2_get_acl(dentry->d_inode, type);
 	if (IS_ERR(acl))
 		return PTR_ERR(acl);
 	if (acl == NULL)
 		return -ENODATA;
 	error = posix_acl_to_xattr(acl, buffer, size);
 	posix_acl_release(acl);

 	return error;
 }

 static int
 ext2_xattr_set_acl(struct dentry *dentry, const char *name, const void *value,
 		   size_t size, int flags, int type)
 {
 	struct posix_acl *acl;
 	int error;

 	if (strcmp(name, "") != 0)
 		return -EINVAL;
 	if (!test_opt(dentry->d_sb, POSIX_ACL))
 		return -EOPNOTSUPP;
 	if (!inode_owner_or_capable(dentry->d_inode))
 		return -EPERM;

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

 	error = ext2_set_acl(dentry->d_inode, type, acl);

 release_and_out:
 	posix_acl_release(acl);
 	return error;
 }

 const struct xattr_handler ext2_xattr_acl_access_handler = {
 	.prefix	= POSIX_ACL_XATTR_ACCESS,
 	.flags	= ACL_TYPE_ACCESS,
 	.list	= ext2_xattr_list_acl_access,
 	.get	= ext2_xattr_get_acl,
 	.set	= ext2_xattr_set_acl,
 };

 const struct xattr_handler ext2_xattr_acl_default_handler = {
 	.prefix	= POSIX_ACL_XATTR_DEFAULT,
 	.flags	= ACL_TYPE_DEFAULT,
 	.list	= ext2_xattr_list_acl_default,
 	.get	= ext2_xattr_get_acl,
 	.set	= ext2_xattr_set_acl,
 };
	/*
	* linux/fs/ext2/acl.c
	*
	* Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de>
	*/

	#include <linux/capability.h>
	#include <linux/init.h>
	#include <linux/sched.h>
	#include <linux/slab.h>
	#include <linux/fs.h>
	#include "ext2.h"
	#include "xattr.h"
	#include "acl.h"

	/*
	* Convert from filesystem to in-memory representation.
	*/
	static struct posix_acl *
	ext2_acl_from_disk(const void *value, size_t size)
	{
	const char end = (char )value + size;
	int n, count;
	struct posix_acl *acl;

	if (!value)
	return NULL;
	if (size < sizeof(ext2_acl_header))
	return ERR_PTR(-EINVAL);
	if (((ext2_acl_header *)value)->a_version !=
	cpu_to_le32(EXT2_ACL_VERSION))
	return ERR_PTR(-EINVAL);
	value = (char *)value + sizeof(ext2_acl_header);
	count = ext2_acl_count(size);
	if (count < 0)
	return ERR_PTR(-EINVAL);
	if (count == 0)
	return NULL;
	acl = posix_acl_alloc(count, GFP_KERNEL);
	if (!acl)
	return ERR_PTR(-ENOMEM);
	for (n=0; n < count; n++) {
	ext2_acl_entry *entry =
	(ext2_acl_entry *)value;
	if ((char *)value + sizeof(ext2_acl_entry_short) > end)
	goto fail;
	acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag);
	acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm);
	switch(acl->a_entries[n].e_tag) {
	case ACL_USER_OBJ:
	case ACL_GROUP_OBJ:
	case ACL_MASK:
	case ACL_OTHER:
	value = (char *)value +
	sizeof(ext2_acl_entry_short);
	acl->a_entries[n].e_id = ACL_UNDEFINED_ID;
	break;

	case ACL_USER:
	case ACL_GROUP:
	value = (char *)value + sizeof(ext2_acl_entry);
	if ((char *)value > end)
	goto fail;
	acl->a_entries[n].e_id =
	le32_to_cpu(entry->e_id);
	break;

	default:
	goto fail;
	}
	}
	if (value != end)
	goto fail;
	return acl;

	fail:
	posix_acl_release(acl);
	return ERR_PTR(-EINVAL);
	}

	/*
	* Convert from in-memory to filesystem representation.
	*/
	static void *
	ext2_acl_to_disk(const struct posix_acl acl, size_t size)
	{
	ext2_acl_header *ext_acl;
	char *e;
	size_t n;

	*size = ext2_acl_size(acl->a_count);
	ext_acl = kmalloc(sizeof(ext2_acl_header) + acl->a_count *
	sizeof(ext2_acl_entry), GFP_KERNEL);
	if (!ext_acl)
	return ERR_PTR(-ENOMEM);
	ext_acl->a_version = cpu_to_le32(EXT2_ACL_VERSION);
	e = (char *)ext_acl + sizeof(ext2_acl_header);
	for (n=0; n < acl->a_count; n++) {
	ext2_acl_entry entry = (ext2_acl_entry )e;
	entry->e_tag = cpu_to_le16(acl->a_entries[n].e_tag);
	entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm);
	switch(acl->a_entries[n].e_tag) {
	case ACL_USER:
	case ACL_GROUP:
	entry->e_id =
	cpu_to_le32(acl->a_entries[n].e_id);
	e += sizeof(ext2_acl_entry);
	break;

	case ACL_USER_OBJ:
	case ACL_GROUP_OBJ:
	case ACL_MASK:
	case ACL_OTHER:
	e += sizeof(ext2_acl_entry_short);
	break;

	default:
	goto fail;
	}
	}
	return (char *)ext_acl;

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

	/*
	* inode->i_mutex: don't care
	*/
	struct posix_acl *
	ext2_get_acl(struct inode *inode, int type)
	{
	int name_index;
	char *value = NULL;
	struct posix_acl *acl;
	int retval;

	if (!test_opt(inode->i_sb, POSIX_ACL))
	return NULL;

	acl = get_cached_acl(inode, type);
	if (acl != ACL_NOT_CACHED)
	return acl;

	switch (type) {
	case ACL_TYPE_ACCESS:
	name_index = EXT2_XATTR_INDEX_POSIX_ACL_ACCESS;
	break;
	case ACL_TYPE_DEFAULT:
	name_index = EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT;
	break;
	default:
	BUG();
	}
	retval = ext2_xattr_get(inode, name_index, "", NULL, 0);
	if (retval > 0) {
	value = kmalloc(retval, GFP_KERNEL);
	if (!value)
	return ERR_PTR(-ENOMEM);
	retval = ext2_xattr_get(inode, name_index, "", value, retval);
	}
	if (retval > 0)
	acl = ext2_acl_from_disk(value, retval);
	else if (retval == -ENODATA \|\| retval == -ENOSYS)
	acl = NULL;
	else
	acl = ERR_PTR(retval);
	kfree(value);

	if (!IS_ERR(acl))
	set_cached_acl(inode, type, acl);

	return acl;
	}

	/*
	* inode->i_mutex: down
	*/
	static int
	ext2_set_acl(struct inode inode, int type, struct posix_acl acl)
	{
	int name_index;
	void *value = NULL;
	size_t size = 0;
	int error;

	if (S_ISLNK(inode->i_mode))
	return -EOPNOTSUPP;
	if (!test_opt(inode->i_sb, POSIX_ACL))
	return 0;

	switch(type) {
	case ACL_TYPE_ACCESS:
	name_index = EXT2_XATTR_INDEX_POSIX_ACL_ACCESS;
	if (acl) {
	error = posix_acl_equiv_mode(acl, &inode->i_mode);
	if (error < 0)
	return error;
	else {
	inode->i_ctime = CURRENT_TIME_SEC;
	mark_inode_dirty(inode);
	if (error == 0)
	acl = NULL;
	}
	}
	break;

	case ACL_TYPE_DEFAULT:
	name_index = EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT;
	if (!S_ISDIR(inode->i_mode))
	return acl ? -EACCES : 0;
	break;

	default:
	return -EINVAL;
	}
	if (acl) {
	value = ext2_acl_to_disk(acl, &size);
	if (IS_ERR(value))
	return (int)PTR_ERR(value);
	}

	error = ext2_xattr_set(inode, name_index, "", value, size, 0);

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

	/*
	* Initialize the ACLs of a new inode. Called from ext2_new_inode.
	*
	* dir->i_mutex: down
	* inode->i_mutex: up (access to inode is still exclusive)
	*/
	int
	ext2_init_acl(struct inode inode, struct inode dir)
	{
	struct posix_acl *acl = NULL;
	int error = 0;

	if (!S_ISLNK(inode->i_mode)) {
	if (test_opt(dir->i_sb, POSIX_ACL)) {
	acl = ext2_get_acl(dir, ACL_TYPE_DEFAULT);
	if (IS_ERR(acl))
	return PTR_ERR(acl);
	}
	if (!acl)
	inode->i_mode &= ~current_umask();
	}
	if (test_opt(inode->i_sb, POSIX_ACL) && acl) {
	if (S_ISDIR(inode->i_mode)) {
	error = ext2_set_acl(inode, ACL_TYPE_DEFAULT, acl);
	if (error)
	goto cleanup;
	}
	error = posix_acl_create(&acl, GFP_KERNEL, &inode->i_mode);
	if (error < 0)
	return error;
	if (error > 0) {
	/* This is an extended ACL */
	error = ext2_set_acl(inode, ACL_TYPE_ACCESS, acl);
	}
	}
	cleanup:
	posix_acl_release(acl);
	return error;
	}

	/*
	* Does chmod for an inode that may have an Access Control List. The
	* inode->i_mode field must be updated to the desired value by the caller
	* before calling this function.
	* Returns 0 on success, or a negative error number.
	*
	* We change the ACL rather than storing some ACL entries in the file
	* mode permission bits (which would be more efficient), because that
	* would break once additional permissions (like ACL_APPEND, ACL_DELETE
	* for directories) are added. There are no more bits available in the
	* file mode.
	*
	* inode->i_mutex: down
	*/
	int
	ext2_acl_chmod(struct inode *inode)
	{
	struct posix_acl *acl;
	int error;

	if (!test_opt(inode->i_sb, POSIX_ACL))
	return 0;
	if (S_ISLNK(inode->i_mode))
	return -EOPNOTSUPP;
	acl = ext2_get_acl(inode, ACL_TYPE_ACCESS);
	if (IS_ERR(acl) \|\| !acl)
	return PTR_ERR(acl);
	error = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
	if (error)
	return error;
	error = ext2_set_acl(inode, ACL_TYPE_ACCESS, acl);
	posix_acl_release(acl);
	return error;
	}

	/*
	* Extended attribut handlers
	*/
	static size_t
	ext2_xattr_list_acl_access(struct dentry dentry, char list, size_t list_size,
	const char *name, size_t name_len, int type)
	{
	const size_t size = sizeof(POSIX_ACL_XATTR_ACCESS);

	if (!test_opt(dentry->d_sb, POSIX_ACL))
	return 0;
	if (list && size <= list_size)
	memcpy(list, POSIX_ACL_XATTR_ACCESS, size);
	return size;
	}

	static size_t
	ext2_xattr_list_acl_default(struct dentry dentry, char list, size_t list_size,
	const char *name, size_t name_len, int type)
	{
	const size_t size = sizeof(POSIX_ACL_XATTR_DEFAULT);

	if (!test_opt(dentry->d_sb, POSIX_ACL))
	return 0;
	if (list && size <= list_size)
	memcpy(list, POSIX_ACL_XATTR_DEFAULT, size);
	return size;
	}

	static int
	ext2_xattr_get_acl(struct dentry dentry, const char name, void *buffer,
	size_t size, int type)
	{
	struct posix_acl *acl;
	int error;

	if (strcmp(name, "") != 0)
	return -EINVAL;
	if (!test_opt(dentry->d_sb, POSIX_ACL))
	return -EOPNOTSUPP;

	acl = ext2_get_acl(dentry->d_inode, type);
	if (IS_ERR(acl))
	return PTR_ERR(acl);
	if (acl == NULL)
	return -ENODATA;
	error = posix_acl_to_xattr(acl, buffer, size);
	posix_acl_release(acl);

	return error;
	}

	static int
	ext2_xattr_set_acl(struct dentry dentry, const char name, const void *value,
	size_t size, int flags, int type)
	{
	struct posix_acl *acl;
	int error;

	if (strcmp(name, "") != 0)
	return -EINVAL;
	if (!test_opt(dentry->d_sb, POSIX_ACL))
	return -EOPNOTSUPP;
	if (!inode_owner_or_capable(dentry->d_inode))
	return -EPERM;

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

	error = ext2_set_acl(dentry->d_inode, type, acl);

	release_and_out:
	posix_acl_release(acl);
	return error;
	}

	const struct xattr_handler ext2_xattr_acl_access_handler = {
	.prefix = POSIX_ACL_XATTR_ACCESS,
	.flags = ACL_TYPE_ACCESS,
	.list = ext2_xattr_list_acl_access,
	.get = ext2_xattr_get_acl,
	.set = ext2_xattr_set_acl,
	};

	const struct xattr_handler ext2_xattr_acl_default_handler = {
	.prefix = POSIX_ACL_XATTR_DEFAULT,
	.flags = ACL_TYPE_DEFAULT,
	.list = ext2_xattr_list_acl_default,
	.get = ext2_xattr_get_acl,
	.set = ext2_xattr_set_acl,
	};