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10#include <linux/xattr.h>
11
12
13#define EXT4_XATTR_MAGIC 0xEA020000
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15
16#define EXT4_XATTR_REFCOUNT_MAX 1024
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18
19#define EXT4_XATTR_INDEX_USER 1
20#define EXT4_XATTR_INDEX_POSIX_ACL_ACCESS 2
21#define EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT 3
22#define EXT4_XATTR_INDEX_TRUSTED 4
23#define EXT4_XATTR_INDEX_LUSTRE 5
24#define EXT4_XATTR_INDEX_SECURITY 6
25#define EXT4_XATTR_INDEX_SYSTEM 7
26#define EXT4_XATTR_INDEX_RICHACL 8
27#define EXT4_XATTR_INDEX_ENCRYPTION 9
28#define EXT4_XATTR_INDEX_HURD 10
29
30struct ext4_xattr_header {
31 __le32 h_magic;
32 __le32 h_refcount;
33 __le32 h_blocks;
34 __le32 h_hash;
35 __le32 h_checksum;
36
37 __u32 h_reserved[3];
38};
39
40struct ext4_xattr_ibody_header {
41 __le32 h_magic;
42};
43
44struct ext4_xattr_entry {
45 __u8 e_name_len;
46 __u8 e_name_index;
47 __le16 e_value_offs;
48 __le32 e_value_inum;
49 __le32 e_value_size;
50 __le32 e_hash;
51 char e_name[0];
52};
53
54#define EXT4_XATTR_PAD_BITS 2
55#define EXT4_XATTR_PAD (1<<EXT4_XATTR_PAD_BITS)
56#define EXT4_XATTR_ROUND (EXT4_XATTR_PAD-1)
57#define EXT4_XATTR_LEN(name_len) \
58 (((name_len) + EXT4_XATTR_ROUND + \
59 sizeof(struct ext4_xattr_entry)) & ~EXT4_XATTR_ROUND)
60#define EXT4_XATTR_NEXT(entry) \
61 ((struct ext4_xattr_entry *)( \
62 (char *)(entry) + EXT4_XATTR_LEN((entry)->e_name_len)))
63#define EXT4_XATTR_SIZE(size) \
64 (((size) + EXT4_XATTR_ROUND) & ~EXT4_XATTR_ROUND)
65
66#define IHDR(inode, raw_inode) \
67 ((struct ext4_xattr_ibody_header *) \
68 ((void *)raw_inode + \
69 EXT4_GOOD_OLD_INODE_SIZE + \
70 EXT4_I(inode)->i_extra_isize))
71#define IFIRST(hdr) ((struct ext4_xattr_entry *)((hdr)+1))
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76
77#define EXT4_XATTR_MIN_LARGE_EA_SIZE(b) \
78 ((b) - EXT4_XATTR_LEN(3) - sizeof(struct ext4_xattr_header) - 4)
79
80#define BHDR(bh) ((struct ext4_xattr_header *)((bh)->b_data))
81#define ENTRY(ptr) ((struct ext4_xattr_entry *)(ptr))
82#define BFIRST(bh) ENTRY(BHDR(bh)+1)
83#define IS_LAST_ENTRY(entry) (*(__u32 *)(entry) == 0)
84
85#define EXT4_ZERO_XATTR_VALUE ((void *)-1)
86
87struct ext4_xattr_info {
88 const char *name;
89 const void *value;
90 size_t value_len;
91 int name_index;
92 int in_inode;
93};
94
95struct ext4_xattr_search {
96 struct ext4_xattr_entry *first;
97 void *base;
98 void *end;
99 struct ext4_xattr_entry *here;
100 int not_found;
101};
102
103struct ext4_xattr_ibody_find {
104 struct ext4_xattr_search s;
105 struct ext4_iloc iloc;
106};
107
108struct ext4_xattr_inode_array {
109 unsigned int count;
110 struct inode *inodes[0];
111};
112
113extern const struct xattr_handler ext4_xattr_user_handler;
114extern const struct xattr_handler ext4_xattr_trusted_handler;
115extern const struct xattr_handler ext4_xattr_security_handler;
116
117#define EXT4_XATTR_NAME_ENCRYPTION_CONTEXT "c"
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127
128static inline void ext4_write_lock_xattr(struct inode *inode, int *save)
129{
130 down_write(&EXT4_I(inode)->xattr_sem);
131 *save = ext4_test_inode_state(inode, EXT4_STATE_NO_EXPAND);
132 ext4_set_inode_state(inode, EXT4_STATE_NO_EXPAND);
133}
134
135static inline int ext4_write_trylock_xattr(struct inode *inode, int *save)
136{
137 if (down_write_trylock(&EXT4_I(inode)->xattr_sem) == 0)
138 return 0;
139 *save = ext4_test_inode_state(inode, EXT4_STATE_NO_EXPAND);
140 ext4_set_inode_state(inode, EXT4_STATE_NO_EXPAND);
141 return 1;
142}
143
144static inline void ext4_write_unlock_xattr(struct inode *inode, int *save)
145{
146 if (*save == 0)
147 ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND);
148 up_write(&EXT4_I(inode)->xattr_sem);
149}
150
151extern ssize_t ext4_listxattr(struct dentry *, char *, size_t);
152
153extern int ext4_xattr_get(struct inode *, int, const char *, void *, size_t);
154extern int ext4_xattr_set(struct inode *, int, const char *, const void *, size_t, int);
155extern int ext4_xattr_set_handle(handle_t *, struct inode *, int, const char *, const void *, size_t, int);
156extern int ext4_xattr_set_credits(struct inode *inode, size_t value_len,
157 bool is_create, int *credits);
158extern int __ext4_xattr_set_credits(struct super_block *sb, struct inode *inode,
159 struct buffer_head *block_bh, size_t value_len,
160 bool is_create);
161
162extern int ext4_xattr_delete_inode(handle_t *handle, struct inode *inode,
163 struct ext4_xattr_inode_array **array,
164 int extra_credits);
165extern void ext4_xattr_inode_array_free(struct ext4_xattr_inode_array *array);
166
167extern int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
168 struct ext4_inode *raw_inode, handle_t *handle);
169
170extern const struct xattr_handler *ext4_xattr_handlers[];
171
172extern int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i,
173 struct ext4_xattr_ibody_find *is);
174extern int ext4_xattr_ibody_get(struct inode *inode, int name_index,
175 const char *name,
176 void *buffer, size_t buffer_size);
177extern int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode,
178 struct ext4_xattr_info *i,
179 struct ext4_xattr_ibody_find *is);
180
181extern struct mb_cache *ext4_xattr_create_cache(void);
182extern void ext4_xattr_destroy_cache(struct mb_cache *);
183
184#ifdef CONFIG_EXT4_FS_SECURITY
185extern int ext4_init_security(handle_t *handle, struct inode *inode,
186 struct inode *dir, const struct qstr *qstr);
187#else
188static inline int ext4_init_security(handle_t *handle, struct inode *inode,
189 struct inode *dir, const struct qstr *qstr)
190{
191 return 0;
192}
193#endif
194
195#ifdef CONFIG_LOCKDEP
196extern void ext4_xattr_inode_set_class(struct inode *ea_inode);
197#else
198static inline void ext4_xattr_inode_set_class(struct inode *ea_inode) { }
199#endif
200
201extern int ext4_get_inode_usage(struct inode *inode, qsize_t *usage);
202
