| /** |
| * 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" |
| |
| 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 XATTR_ROUND (3) |
| |
| #define XATTR_SELINUX_SUFFIX "selinux" |
| #define F2FS_XATTR_INDEX_SECURITY 6 |
| #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(PAGE_SIZE - \ |
| sizeof(struct node_footer) - sizeof(__u32)) |
| |
| #define MAX_VALUE_LEN (MIN_OFFSET - \ |
| sizeof(struct f2fs_xattr_header) - \ |
| sizeof(struct f2fs_xattr_entry)) |
| |
| #endif |