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 38 #define F2FS_XATTR_NAME_ENCRYPTION_CONTEXT "c" 39 40 struct f2fs_xattr_header { 41 __le32 h_magic; /* magic number for identification */ 42 __le32 h_refcount; /* reference count */ 43 __u32 h_reserved[4]; /* zero right now */ 44 }; 45 46 struct f2fs_xattr_entry { 47 __u8 e_name_index; 48 __u8 e_name_len; 49 __le16 e_value_size; /* size of attribute value */ 50 char e_name[0]; /* attribute name */ 51 }; 52 53 #define XATTR_HDR(ptr) ((struct f2fs_xattr_header *)(ptr)) 54 #define XATTR_ENTRY(ptr) ((struct f2fs_xattr_entry *)(ptr)) 55 #define XATTR_FIRST_ENTRY(ptr) (XATTR_ENTRY(XATTR_HDR(ptr) + 1)) 56 #define XATTR_ROUND (3) 57 58 #define XATTR_ALIGN(size) (((size) + XATTR_ROUND) & ~XATTR_ROUND) 59 60 #define ENTRY_SIZE(entry) (XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) + \ 61 (entry)->e_name_len + le16_to_cpu((entry)->e_value_size))) 62 63 #define XATTR_NEXT_ENTRY(entry) ((struct f2fs_xattr_entry *)((char *)(entry) +\ 64 ENTRY_SIZE(entry))) 65 66 #define IS_XATTR_LAST_ENTRY(entry) (*(__u32 *)(entry) == 0) 67 68 #define list_for_each_xattr(entry, addr) \ 69 for (entry = XATTR_FIRST_ENTRY(addr);\ 70 !IS_XATTR_LAST_ENTRY(entry);\ 71 entry = XATTR_NEXT_ENTRY(entry)) 72 #define VALID_XATTR_BLOCK_SIZE (PAGE_SIZE - sizeof(struct node_footer)) 73 #define XATTR_PADDING_SIZE (sizeof(__u32)) 74 #define MIN_OFFSET(i) XATTR_ALIGN(inline_xattr_size(i) + \ 75 VALID_XATTR_BLOCK_SIZE) 76 77 #define MAX_VALUE_LEN(i) (MIN_OFFSET(i) - \ 78 sizeof(struct f2fs_xattr_header) - \ 79 sizeof(struct f2fs_xattr_entry)) 80 81 /* 82 * On-disk structure of f2fs_xattr 83 * We use inline xattrs space + 1 block for xattr. 84 * 85 * +--------------------+ 86 * | f2fs_xattr_header | 87 * | | 88 * +--------------------+ 89 * | f2fs_xattr_entry | 90 * | .e_name_index = 1 | 91 * | .e_name_len = 3 | 92 * | .e_value_size = 14 | 93 * | .e_name = "foo" | 94 * | "value_of_xattr" |<- value_offs = e_name + e_name_len 95 * +--------------------+ 96 * | f2fs_xattr_entry | 97 * | .e_name_index = 4 | 98 * | .e_name = "bar" | 99 * +--------------------+ 100 * | | 101 * | Free | 102 * | | 103 * +--------------------+<- MIN_OFFSET 104 * | node_footer | 105 * | (nid, ino, offset) | 106 * +--------------------+ 107 * 108 **/ 109 110 #ifdef CONFIG_F2FS_FS_XATTR 111 extern const struct xattr_handler f2fs_xattr_user_handler; 112 extern const struct xattr_handler f2fs_xattr_trusted_handler; 113 extern const struct xattr_handler f2fs_xattr_advise_handler; 114 extern const struct xattr_handler f2fs_xattr_security_handler; 115 116 extern const struct xattr_handler *f2fs_xattr_handlers[]; 117 118 extern int f2fs_setxattr(struct inode *, int, const char *, 119 const void *, size_t, struct page *, int); 120 extern int f2fs_getxattr(struct inode *, int, const char *, void *, 121 size_t, struct page *); 122 extern ssize_t f2fs_listxattr(struct dentry *, char *, size_t); 123 #else 124 125 #define f2fs_xattr_handlers NULL 126 static inline int f2fs_setxattr(struct inode *inode, int index, 127 const char *name, const void *value, size_t size, 128 struct page *page, int flags) 129 { 130 return -EOPNOTSUPP; 131 } 132 static inline int f2fs_getxattr(struct inode *inode, int index, 133 const char *name, void *buffer, 134 size_t buffer_size, struct page *dpage) 135 { 136 return -EOPNOTSUPP; 137 } 138 static inline ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer, 139 size_t buffer_size) 140 { 141 return -EOPNOTSUPP; 142 } 143 #endif 144 145 #ifdef CONFIG_F2FS_FS_SECURITY 146 extern int f2fs_init_security(struct inode *, struct inode *, 147 const struct qstr *, struct page *); 148 #else 149 static inline int f2fs_init_security(struct inode *inode, struct inode *dir, 150 const struct qstr *qstr, struct page *ipage) 151 { 152 return 0; 153 } 154 #endif 155 #endif /* __F2FS_XATTR_H__ */ 156