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/**
* xattr.h
*
* Many parts of codes are copied from Linux kernel/fs/f2fs.
*
* Copyright (C) 2015 Huawei Ltd.
* Witten by:
* Hou Pengyang <houpengyang@huawei.com>
* Liu Shuoran <liushuoran@huawei.com>
* Jaegeuk Kim <jaegeuk@kernel.org>
*
* 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.
*/
#ifndef _XATTR_H_
#define _XATTR_H_
#include "f2fs.h"
#ifdef HAVE_SYS_XATTR_H
#include <sys/xattr.h>
#endif
struct f2fs_xattr_header {
__le32 h_magic; /* magic number for identification */
__le32 h_refcount; /* reference count */
__u32 h_sloadd[4]; /* zero right now */
};
struct f2fs_xattr_entry {
__u8 e_name_index;
__u8 e_name_len;
__le16 e_value_size; /* size of attribute value */
char e_name[0]; /* attribute name */
};
#define FS_ENCRYPTION_CONTEXT_FORMAT_V1 1
#ifndef FS_KEY_DESCRIPTOR_SIZE
#define FS_KEY_DESCRIPTOR_SIZE 8
#endif
#define FS_KEY_DERIVATION_NONCE_SIZE 16
struct fscrypt_context {
u8 format;
u8 contents_encryption_mode;
u8 filenames_encryption_mode;
u8 flags;
u8 master_key_descriptor[FS_KEY_DESCRIPTOR_SIZE];
u8 nonce[FS_KEY_DERIVATION_NONCE_SIZE];
};
static_assert(sizeof(struct fscrypt_context) == 28, "");
#define F2FS_ACL_VERSION 0x0001
struct f2fs_acl_entry {
__le16 e_tag;
__le16 e_perm;
__le32 e_id;
};
struct f2fs_acl_entry_short {
__le16 e_tag;
__le16 e_perm;
};
struct f2fs_acl_header {
__le32 a_version;
};
static inline int f2fs_acl_count(int 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;
}
}
#ifndef XATTR_USER_PREFIX
#define XATTR_USER_PREFIX "user."
#endif
#ifndef XATTR_SECURITY_PREFIX
#define XATTR_SECURITY_PREFIX "security."
#endif
#ifndef XATTR_TRUSTED_PREFIX
#define XATTR_TRUSTED_PREFIX "trusted."
#endif
#ifndef XATTR_CREATE
#define XATTR_CREATE 0x1
#endif
#ifndef XATTR_REPLACE
#define XATTR_REPLACE 0x2
#endif
#define XATTR_ROUND (3)
#define XATTR_SELINUX_SUFFIX "selinux"
#define F2FS_XATTR_INDEX_USER 1
#define F2FS_XATTR_INDEX_POSIX_ACL_ACCESS 2
#define F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT 3
#define F2FS_XATTR_INDEX_TRUSTED 4
#define F2FS_XATTR_INDEX_LUSTRE 5
#define F2FS_XATTR_INDEX_SECURITY 6
#define F2FS_XATTR_INDEX_ENCRYPTION 9
#define IS_XATTR_LAST_ENTRY(entry) (*(__u32 *)(entry) == 0)
#define XATTR_HDR(ptr) ((struct f2fs_xattr_header *)(ptr))
#define XATTR_ENTRY(ptr) ((struct f2fs_xattr_entry *)(ptr))
#define F2FS_XATTR_MAGIC 0xF2F52011
#define XATTR_NEXT_ENTRY(entry) ((struct f2fs_xattr_entry *) ((char *)(entry) +\
ENTRY_SIZE(entry)))
#define XATTR_FIRST_ENTRY(ptr) (XATTR_ENTRY(XATTR_HDR(ptr) + 1))
#define XATTR_ALIGN(size) ((size + XATTR_ROUND) & ~XATTR_ROUND)
#define ENTRY_SIZE(entry) (XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) + \
entry->e_name_len + le16_to_cpu(entry->e_value_size)))
#define list_for_each_xattr(entry, addr) \
for (entry = XATTR_FIRST_ENTRY(addr); \
!IS_XATTR_LAST_ENTRY(entry); \
entry = XATTR_NEXT_ENTRY(entry))
#define MIN_OFFSET XATTR_ALIGN(F2FS_BLKSIZE - \
sizeof(struct node_footer) - sizeof(__u32))
#define MAX_VALUE_LEN (MIN_OFFSET - \
sizeof(struct f2fs_xattr_header) - \
sizeof(struct f2fs_xattr_entry))
#define MAX_INLINE_XATTR_SIZE \
(DEF_ADDRS_PER_INODE - \
F2FS_TOTAL_EXTRA_ATTR_SIZE / sizeof(__le32) - \
DEF_INLINE_RESERVED_SIZE - \
MIN_INLINE_DENTRY_SIZE / sizeof(__le32))
#endif
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