aboutsummaryrefslogtreecommitdiff
path: root/fs/ext4/xattr.h
blob: 5c7e55edfe6c54939b069631659dbc2cfdd4cab3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
/*
  File: fs/ext4/xattr.h

  On-disk format of extended attributes for the ext4 filesystem.

  (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
*/

#include <linux/xattr.h>

/* Magic value in attribute blocks */
#define EXT4_XATTR_MAGIC		0xEA020000

/* Maximum number of references to one attribute block */
#define EXT4_XATTR_REFCOUNT_MAX		1024

/* Name indexes */
#define EXT4_XATTR_INDEX_USER			1
#define EXT4_XATTR_INDEX_POSIX_ACL_ACCESS	2
#define EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT	3
#define EXT4_XATTR_INDEX_TRUSTED		4
#define	EXT4_XATTR_INDEX_LUSTRE			5
#define EXT4_XATTR_INDEX_SECURITY	        6
#define EXT4_XATTR_INDEX_SYSTEM			7

struct ext4_xattr_header {
	__le32	h_magic;	/* magic number for identification */
	__le32	h_refcount;	/* reference count */
	__le32	h_blocks;	/* number of disk blocks used */
	__le32	h_hash;		/* hash value of all attributes */
	__le32	h_checksum;	/* crc32c(uuid+id+xattrblock) */
				/* id = inum if refcount=1, blknum otherwise */
	__u32	h_reserved[3];	/* zero right now */
};

struct ext4_xattr_ibody_header {
	__le32	h_magic;	/* magic number for identification */
};

struct ext4_xattr_entry {
	__u8	e_name_len;	/* length of name */
	__u8	e_name_index;	/* attribute name index */
	__le16	e_value_offs;	/* offset in disk block of value */
	__le32	e_value_block;	/* disk block attribute is stored on (n/i) */
	__le32	e_value_size;	/* size of attribute value */
	__le32	e_hash;		/* hash value of name and value */
	char	e_name[0];	/* attribute name */
};

#define EXT4_XATTR_PAD_BITS		2
#define EXT4_XATTR_PAD		(1<<EXT4_XATTR_PAD_BITS)
#define EXT4_XATTR_ROUND		(EXT4_XATTR_PAD-1)
#define EXT4_XATTR_LEN(name_len) \
	(((name_len) + EXT4_XATTR_ROUND + \
	sizeof(struct ext4_xattr_entry)) & ~EXT4_XATTR_ROUND)
#define EXT4_XATTR_NEXT(entry) \
	((struct ext4_xattr_entry *)( \
	 (char *)(entry) + EXT4_XATTR_LEN((entry)->e_name_len)))
#define EXT4_XATTR_SIZE(size) \
	(((size) + EXT4_XATTR_ROUND) & ~EXT4_XATTR_ROUND)

#define IHDR(inode, raw_inode) \
	((struct ext4_xattr_ibody_header *) \
		((void *)raw_inode + \
		EXT4_GOOD_OLD_INODE_SIZE + \
		EXT4_I(inode)->i_extra_isize))
#define IFIRST(hdr) ((struct ext4_xattr_entry *)((hdr)+1))

#define BHDR(bh) ((struct ext4_xattr_header *)((bh)->b_data))
#define ENTRY(ptr) ((struct ext4_xattr_entry *)(ptr))
#define BFIRST(bh) ENTRY(BHDR(bh)+1)
#define IS_LAST_ENTRY(entry) (*(__u32 *)(entry) == 0)


struct ext4_xattr_info {
	int name_index;
	const char *name;
	const void *value;
	size_t value_len;
};

struct ext4_xattr_search {
	struct ext4_xattr_entry *first;
	void *base;
	void *end;
	struct ext4_xattr_entry *here;
	int not_found;
};

struct ext4_xattr_ibody_find {
	struct ext4_xattr_search s;
	struct ext4_iloc iloc;
};

# ifdef CONFIG_EXT4_FS_XATTR

extern const struct xattr_handler ext4_xattr_user_handler;
extern const struct xattr_handler ext4_xattr_trusted_handler;
extern const struct xattr_handler ext4_xattr_acl_access_handler;
extern const struct xattr_handler ext4_xattr_acl_default_handler;
extern const struct xattr_handler ext4_xattr_security_handler;

extern ssize_t ext4_listxattr(struct dentry *, char *, size_t);

extern int ext4_xattr_get(struct inode *, int, const char *, void *, size_t);
extern int ext4_xattr_set(struct inode *, int, const char *, const void *, size_t, int);
extern int ext4_xattr_set_handle(handle_t *, struct inode *, int, const char *, const void *, size_t, int);

extern void ext4_xattr_delete_inode(handle_t *, struct inode *);
extern void ext4_xattr_put_super(struct super_block *);

extern int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
			    struct ext4_inode *raw_inode, handle_t *handle);

extern int __init ext4_init_xattr(void);
extern void ext4_exit_xattr(void);

extern const struct xattr_handler *ext4_xattr_handlers[];

extern int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i,
				 struct ext4_xattr_ibody_find *is);
extern int ext4_xattr_ibody_get(struct inode *inode, int name_index,
				const char *name,
				void *buffer, size_t buffer_size);
extern int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode,
				struct ext4_xattr_info *i,
				struct ext4_xattr_ibody_find *is);

extern int ext4_has_inline_data(struct inode *inode);
extern int ext4_get_inline_size(struct inode *inode);
extern int ext4_get_max_inline_size(struct inode *inode);
extern int ext4_find_inline_data_nolock(struct inode *inode);
extern void ext4_write_inline_data(struct inode *inode,
				   struct ext4_iloc *iloc,
				   void *buffer, loff_t pos,
				   unsigned int len);
extern int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
				    unsigned int len);
extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
				 unsigned int len);
extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);

extern int ext4_readpage_inline(struct inode *inode, struct page *page);
extern int ext4_try_to_write_inline_data(struct address_space *mapping,
					 struct inode *inode,
					 loff_t pos, unsigned len,
					 unsigned flags,
					 struct page **pagep);
extern int ext4_write_inline_data_end(struct inode *inode,
				      loff_t pos, unsigned len,
				      unsigned copied,
				      struct page *page);
extern struct buffer_head *
ext4_journalled_write_inline_data(struct inode *inode,
				  unsigned len,
				  struct page *page);
extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
					   struct inode *inode,
					   loff_t pos, unsigned len,
					   unsigned flags,
					   struct page **pagep,
					   void **fsdata);
extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
					 unsigned len, unsigned copied,
					 struct page *page);
extern int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry,
				     struct inode *inode);
extern int ext4_try_create_inline_dir(handle_t *handle,
				      struct inode *parent,
				      struct inode *inode);
extern int ext4_read_inline_dir(struct file *filp,
				void *dirent, filldir_t filldir,
				int *has_inline_data);
extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
					const struct qstr *d_name,
					struct ext4_dir_entry_2 **res_dir,
					int *has_inline_data);
extern int ext4_delete_inline_entry(handle_t *handle,
				    struct inode *dir,
				    struct ext4_dir_entry_2 *de_del,
				    struct buffer_head *bh,
				    int *has_inline_data);
extern int empty_inline_dir(struct inode *dir, int *has_inline_data);
extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
					struct ext4_dir_entry_2 **parent_de,
					int *retval);
extern int ext4_inline_data_fiemap(struct inode *inode,
				   struct fiemap_extent_info *fieinfo,
				   int *has_inline);
# else  /* CONFIG_EXT4_FS_XATTR */

static inline int
ext4_xattr_get(struct inode *inode, int name_index, const char *name,
	       void *buffer, size_t size, int flags)
{
	return -EOPNOTSUPP;
}

static inline int
ext4_xattr_set(struct inode *inode, int name_index, const char *name,
	       const void *value, size_t size, int flags)
{
	return -EOPNOTSUPP;
}

static inline int
ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index,
	       const char *name, const void *value, size_t size, int flags)
{
	return -EOPNOTSUPP;
}

static inline void
ext4_xattr_delete_inode(handle_t *handle, struct inode *inode)
{
}

static inline void
ext4_xattr_put_super(struct super_block *sb)
{
}

static __init inline int
ext4_init_xattr(void)
{
	return 0;
}

static inline void
ext4_exit_xattr(void)
{
}

static inline int
ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
			    struct ext4_inode *raw_inode, handle_t *handle)
{
	return -EOPNOTSUPP;
}

#define ext4_xattr_handlers	NULL

static inline int
ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i,
		      struct ext4_xattr_ibody_find *is)
{
	return -EOPNOTSUPP;
}

static inline int
ext4_xattr_ibody_set(handle_t *handle, struct inode *inode,
		     struct ext4_xattr_info *i,
		     struct ext4_xattr_ibody_find *is)
{
	return -EOPNOTSUPP;
}

static inline int
ext4_xattr_ibody_get(struct inode *inode, int name_index,
		     const char *name,
		     void *buffer, size_t buffer_size)
{
	return -EOPNOTSUPP;
}

static inline int ext4_find_inline_data_nolock(struct inode *inode)
{
	return 0;
}

static inline int ext4_has_inline_data(struct inode *inode)
{
	return 0;
}

static inline int ext4_get_inline_size(struct inode *inode)
{
	return 0;
}

static inline int ext4_get_max_inline_size(struct inode *inode)
{
	return 0;
}

static inline void ext4_write_inline_data(struct inode *inode,
					  struct ext4_iloc *iloc,
					  void *buffer, loff_t pos,
					  unsigned int len)
{
	return;
}

static inline int ext4_init_inline_data(handle_t *handle,
					struct inode *inode,
					unsigned int len)
{
	return 0;
}

static inline int ext4_destroy_inline_data(handle_t *handle,
					   struct inode *inode)
{
	return 0;
}

static inline int ext4_readpage_inline(struct inode *inode, struct page *page)
{
	return 0;
}

static inline int ext4_try_to_write_inline_data(struct address_space *mapping,
						struct inode *inode,
						loff_t pos, unsigned len,
						unsigned flags,
						struct page **pagep)
{
	return 0;
}

static inline int ext4_write_inline_data_end(struct inode *inode,
					     loff_t pos, unsigned len,
					     unsigned copied,
					     struct page *page)
{
	return 0;
}

static inline struct buffer_head *
ext4_journalled_write_inline_data(struct inode *inode,
				  unsigned len,
				  struct page *page)
{
	return NULL;
}

static inline int
ext4_da_write_inline_data_begin(struct address_space *mapping,
				struct inode *inode,
				loff_t pos, unsigned len,
				unsigned flags,
				struct page **pagep,
				void **fsdata)
{
	return 0;
}

static inline int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
						unsigned len, unsigned copied,
						struct page *page)
{
	return 0;
}

static inline int ext4_try_add_inline_entry(handle_t *handle,
					    struct dentry *dentry,
					    struct inode *inode)
{
	return 0;
}

static inline int ext4_try_create_inline_dir(handle_t *handle,
					     struct inode *parent,
					     struct inode *inode)
{
	return 0;
}
static inline int ext4_read_inline_dir(struct file *filp,
				       void *dirent, filldir_t filldir,
				       int *has_inline_data)
{
	return 0;
}

static inline struct buffer_head *
ext4_find_inline_entry(struct inode *dir,
		       const struct qstr *d_name,
		       struct ext4_dir_entry_2 **res_dir,
		       int *has_inline_data)
{
	return NULL;
}
static inline int ext4_delete_inline_entry(handle_t *handle,
					   struct inode *dir,
					   struct ext4_dir_entry_2 *de_del,
					   struct buffer_head *bh,
					   int *has_inline_data)
{
	return 0;
}

static inline int empty_inline_dir(struct inode *dir, int *has_inline_data)
{
	return 0;
}

static inline struct buffer_head *
ext4_get_first_inline_block(struct inode *inode,
			    struct ext4_dir_entry_2 **parent_de,
			    int *retval)
{
	return NULL;
}

static inline int ext4_inline_data_fiemap(struct inode *inode,
					  struct fiemap_extent_info *fieinfo,
					  int *has_inline)
{
	return 0;
}
# endif  /* CONFIG_EXT4_FS_XATTR */

#ifdef CONFIG_EXT4_FS_SECURITY
extern int ext4_init_security(handle_t *handle, struct inode *inode,
			      struct inode *dir, const struct qstr *qstr);
#else
static inline int ext4_init_security(handle_t *handle, struct inode *inode,
				     struct inode *dir, const struct qstr *qstr)
{
	return 0;
}
#endif