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Linux/fs/f2fs/xattr.h

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  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 XATTR_SIZE(x,i)         (((x) ? VALID_XATTR_BLOCK_SIZE : 0) +   \
 75                                                 (inline_xattr_size(i)))
 76 #define MIN_OFFSET(i)           XATTR_ALIGN(inline_xattr_size(i) +      \
 77                                                 VALID_XATTR_BLOCK_SIZE)
 78 
 79 #define MAX_VALUE_LEN(i)        (MIN_OFFSET(i) -                        \
 80                                 sizeof(struct f2fs_xattr_header) -      \
 81                                 sizeof(struct f2fs_xattr_entry))
 82 
 83 #define MAX_INLINE_XATTR_SIZE                                           \
 84                         (DEF_ADDRS_PER_INODE -                          \
 85                         F2FS_TOTAL_EXTRA_ATTR_SIZE / sizeof(__le32) -   \
 86                         DEF_INLINE_RESERVED_SIZE -                      \
 87                         MIN_INLINE_DENTRY_SIZE / sizeof(__le32))
 88 
 89 /*
 90  * On-disk structure of f2fs_xattr
 91  * We use inline xattrs space + 1 block for xattr.
 92  *
 93  * +--------------------+
 94  * | f2fs_xattr_header  |
 95  * |                    |
 96  * +--------------------+
 97  * | f2fs_xattr_entry   |
 98  * | .e_name_index = 1  |
 99  * | .e_name_len = 3    |
100  * | .e_value_size = 14 |
101  * | .e_name = "foo"    |
102  * | "value_of_xattr"   |<- value_offs = e_name + e_name_len
103  * +--------------------+
104  * | f2fs_xattr_entry   |
105  * | .e_name_index = 4  |
106  * | .e_name = "bar"    |
107  * +--------------------+
108  * |                    |
109  * |        Free        |
110  * |                    |
111  * +--------------------+<- MIN_OFFSET
112  * |   node_footer      |
113  * | (nid, ino, offset) |
114  * +--------------------+
115  *
116  **/
117 
118 #ifdef CONFIG_F2FS_FS_XATTR
119 extern const struct xattr_handler f2fs_xattr_user_handler;
120 extern const struct xattr_handler f2fs_xattr_trusted_handler;
121 extern const struct xattr_handler f2fs_xattr_advise_handler;
122 extern const struct xattr_handler f2fs_xattr_security_handler;
123 
124 extern const struct xattr_handler *f2fs_xattr_handlers[];
125 
126 extern int f2fs_setxattr(struct inode *, int, const char *,
127                                 const void *, size_t, struct page *, int);
128 extern int f2fs_getxattr(struct inode *, int, const char *, void *,
129                                                 size_t, struct page *);
130 extern ssize_t f2fs_listxattr(struct dentry *, char *, size_t);
131 #else
132 
133 #define f2fs_xattr_handlers     NULL
134 static inline int f2fs_setxattr(struct inode *inode, int index,
135                 const char *name, const void *value, size_t size,
136                 struct page *page, int flags)
137 {
138         return -EOPNOTSUPP;
139 }
140 static inline int f2fs_getxattr(struct inode *inode, int index,
141                         const char *name, void *buffer,
142                         size_t buffer_size, struct page *dpage)
143 {
144         return -EOPNOTSUPP;
145 }
146 static inline ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer,
147                 size_t buffer_size)
148 {
149         return -EOPNOTSUPP;
150 }
151 #endif
152 
153 #ifdef CONFIG_F2FS_FS_SECURITY
154 extern int f2fs_init_security(struct inode *, struct inode *,
155                                 const struct qstr *, struct page *);
156 #else
157 static inline int f2fs_init_security(struct inode *inode, struct inode *dir,
158                                 const struct qstr *qstr, struct page *ipage)
159 {
160         return 0;
161 }
162 #endif
163 #endif /* __F2FS_XATTR_H__ */
164 

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