1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * fs/f2fs/xattr.h 4 * 5 * Copyright (c) 2012 Samsung Electronics Co., Ltd. 6 * http://www.samsung.com/ 7 * 8 * Portions of this code from linux/fs/ext2/xattr.h 9 * 10 * On-disk format of extended attributes for the ext2 filesystem. 11 * 12 * (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org> 13 */ 14 #ifndef __F2FS_XATTR_H__ 15 #define __F2FS_XATTR_H__ 16 17 #include <linux/init.h> 18 #include <linux/xattr.h> 19 20 /* Magic value in attribute blocks */ 21 #define F2FS_XATTR_MAGIC 0xF2F52011 22 23 /* Maximum number of references to one attribute block */ 24 #define F2FS_XATTR_REFCOUNT_MAX 1024 25 26 /* Name indexes */ 27 #define F2FS_SYSTEM_ADVISE_NAME "system.advise" 28 #define F2FS_XATTR_INDEX_USER 1 29 #define F2FS_XATTR_INDEX_POSIX_ACL_ACCESS 2 30 #define F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT 3 31 #define F2FS_XATTR_INDEX_TRUSTED 4 32 #define F2FS_XATTR_INDEX_LUSTRE 5 33 #define F2FS_XATTR_INDEX_SECURITY 6 34 #define F2FS_XATTR_INDEX_ADVISE 7 35 /* Should be same as EXT4_XATTR_INDEX_ENCRYPTION */ 36 #define F2FS_XATTR_INDEX_ENCRYPTION 9 37 #define F2FS_XATTR_INDEX_VERITY 11 38 39 #define F2FS_XATTR_NAME_ENCRYPTION_CONTEXT "c" 40 #define F2FS_XATTR_NAME_VERITY "v" 41 42 struct f2fs_xattr_header { 43 __le32 h_magic; /* magic number for identification */ 44 __le32 h_refcount; /* reference count */ 45 __u32 h_reserved[4]; /* zero right now */ 46 }; 47 48 struct f2fs_xattr_entry { 49 __u8 e_name_index; 50 __u8 e_name_len; 51 __le16 e_value_size; /* size of attribute value */ 52 char e_name[0]; /* attribute name */ 53 }; 54 55 #define XATTR_HDR(ptr) ((struct f2fs_xattr_header *)(ptr)) 56 #define XATTR_ENTRY(ptr) ((struct f2fs_xattr_entry *)(ptr)) 57 #define XATTR_FIRST_ENTRY(ptr) (XATTR_ENTRY(XATTR_HDR(ptr) + 1)) 58 #define XATTR_ROUND (3) 59 60 #define XATTR_ALIGN(size) (((size) + XATTR_ROUND) & ~XATTR_ROUND) 61 62 #define ENTRY_SIZE(entry) (XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) + \ 63 (entry)->e_name_len + le16_to_cpu((entry)->e_value_size))) 64 65 #define XATTR_NEXT_ENTRY(entry) ((struct f2fs_xattr_entry *)((char *)(entry) +\ 66 ENTRY_SIZE(entry))) 67 68 #define IS_XATTR_LAST_ENTRY(entry) (*(__u32 *)(entry) == 0) 69 70 #define list_for_each_xattr(entry, addr) \ 71 for (entry = XATTR_FIRST_ENTRY(addr);\ 72 !IS_XATTR_LAST_ENTRY(entry);\ 73 entry = XATTR_NEXT_ENTRY(entry)) 74 #define VALID_XATTR_BLOCK_SIZE (PAGE_SIZE - sizeof(struct node_footer)) 75 #define XATTR_PADDING_SIZE (sizeof(__u32)) 76 #define XATTR_SIZE(x,i) (((x) ? VALID_XATTR_BLOCK_SIZE : 0) + \ 77 (inline_xattr_size(i))) 78 #define MIN_OFFSET(i) XATTR_ALIGN(inline_xattr_size(i) + \ 79 VALID_XATTR_BLOCK_SIZE) 80 81 #define MAX_VALUE_LEN(i) (MIN_OFFSET(i) - \ 82 sizeof(struct f2fs_xattr_header) - \ 83 sizeof(struct f2fs_xattr_entry)) 84 85 #define MAX_INLINE_XATTR_SIZE \ 86 (DEF_ADDRS_PER_INODE - \ 87 F2FS_TOTAL_EXTRA_ATTR_SIZE / sizeof(__le32) - \ 88 DEF_INLINE_RESERVED_SIZE - \ 89 MIN_INLINE_DENTRY_SIZE / sizeof(__le32)) 90 91 /* 92 * On-disk structure of f2fs_xattr 93 * We use inline xattrs space + 1 block for xattr. 94 * 95 * +--------------------+ 96 * | f2fs_xattr_header | 97 * | | 98 * +--------------------+ 99 * | f2fs_xattr_entry | 100 * | .e_name_index = 1 | 101 * | .e_name_len = 3 | 102 * | .e_value_size = 14 | 103 * | .e_name = "foo" | 104 * | "value_of_xattr" |<- value_offs = e_name + e_name_len 105 * +--------------------+ 106 * | f2fs_xattr_entry | 107 * | .e_name_index = 4 | 108 * | .e_name = "bar" | 109 * +--------------------+ 110 * | | 111 * | Free | 112 * | | 113 * +--------------------+<- MIN_OFFSET 114 * | node_footer | 115 * | (nid, ino, offset) | 116 * +--------------------+ 117 * 118 **/ 119 120 #ifdef CONFIG_F2FS_FS_XATTR 121 extern const struct xattr_handler f2fs_xattr_user_handler; 122 extern const struct xattr_handler f2fs_xattr_trusted_handler; 123 extern const struct xattr_handler f2fs_xattr_advise_handler; 124 extern const struct xattr_handler f2fs_xattr_security_handler; 125 126 extern const struct xattr_handler *f2fs_xattr_handlers[]; 127 128 extern int f2fs_setxattr(struct inode *, int, const char *, 129 const void *, size_t, struct page *, int); 130 extern int f2fs_getxattr(struct inode *, int, const char *, void *, 131 size_t, struct page *); 132 extern ssize_t f2fs_listxattr(struct dentry *, char *, size_t); 133 #else 134 135 #define f2fs_xattr_handlers NULL 136 static inline int f2fs_setxattr(struct inode *inode, int index, 137 const char *name, const void *value, size_t size, 138 struct page *page, int flags) 139 { 140 return -EOPNOTSUPP; 141 } 142 static inline int f2fs_getxattr(struct inode *inode, int index, 143 const char *name, void *buffer, 144 size_t buffer_size, struct page *dpage) 145 { 146 return -EOPNOTSUPP; 147 } 148 static inline ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer, 149 size_t buffer_size) 150 { 151 return -EOPNOTSUPP; 152 } 153 #endif 154 155 #ifdef CONFIG_F2FS_FS_SECURITY 156 extern int f2fs_init_security(struct inode *, struct inode *, 157 const struct qstr *, struct page *); 158 #else 159 static inline int f2fs_init_security(struct inode *inode, struct inode *dir, 160 const struct qstr *qstr, struct page *ipage) 161 { 162 return 0; 163 } 164 #endif 165 #endif /* __F2FS_XATTR_H__ */ 166