2 * Copyright (c) 2015 Grzegorz Kostka (kostka.grzegorz@gmail.com)
3 * Copyright (c) 2015 Kaho Ng (ngkaho1234@gmail.com)
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 /** @addtogroup lwext4
34 * @brief Extended Attribute manipulation.
44 #include "ext4_config.h"
45 #include "ext4_types.h"
46 #include "ext4_inode.h"
47 #include "misc/tree.h"
48 #include "misc/queue.h"
50 struct ext4_xattr_item {
51 /* This attribute should be stored in inode body */
61 RB_ENTRY(ext4_xattr_item) node;
64 struct ext4_xattr_ref {
66 struct ext4_block block;
67 struct ext4_inode_ref *inode_ref;
70 int32_t block_size_rem;
71 int32_t inode_size_rem;
75 struct ext4_xattr_item *iter_from;
77 RB_HEAD(ext4_xattr_tree,
78 ext4_xattr_item) root;
81 #define EXT4_XATTR_PAD_BITS 2
82 #define EXT4_XATTR_PAD (1<<EXT4_XATTR_PAD_BITS)
83 #define EXT4_XATTR_ROUND (EXT4_XATTR_PAD-1)
84 #define EXT4_XATTR_LEN(name_len) \
85 (((name_len) + EXT4_XATTR_ROUND + \
86 sizeof(struct ext4_xattr_entry)) & ~EXT4_XATTR_ROUND)
87 #define EXT4_XATTR_NEXT(entry) \
88 ((struct ext4_xattr_entry *)( \
89 (char *)(entry) + EXT4_XATTR_LEN((entry)->e_name_len)))
90 #define EXT4_XATTR_SIZE(size) \
91 (((size) + EXT4_XATTR_ROUND) & ~EXT4_XATTR_ROUND)
92 #define EXT4_XATTR_NAME(entry) \
93 ((char *)((entry) + 1))
95 #define EXT4_XATTR_IHDR(sb, raw_inode) \
96 ((struct ext4_xattr_ibody_header *) \
97 ((char *)raw_inode + \
98 EXT4_GOOD_OLD_INODE_SIZE + \
99 ext4_inode_get_extra_isize(sb, raw_inode)))
100 #define EXT4_XATTR_IFIRST(hdr) \
101 ((struct ext4_xattr_entry *)((hdr)+1))
103 #define EXT4_XATTR_BHDR(block) \
104 ((struct ext4_xattr_header *)((block)->data))
105 #define EXT4_XATTR_ENTRY(ptr) \
106 ((struct ext4_xattr_entry *)(ptr))
107 #define EXT4_XATTR_BFIRST(block) \
108 EXT4_XATTR_ENTRY(EXT4_XATTR_BHDR(block)+1)
109 #define EXT4_XATTR_IS_LAST_ENTRY(entry) \
110 (*(uint32_t *)(entry) == 0)
112 #define EXT4_ZERO_XATTR_VALUE ((void *)-1)
115 #define EXT4_XATTR_ITERATE_CONT 0
116 #define EXT4_XATTR_ITERATE_STOP 1
117 #define EXT4_XATTR_ITERATE_PAUSE 2
119 int ext4_fs_get_xattr_ref(struct ext4_fs *fs, struct ext4_inode_ref *inode_ref,
120 struct ext4_xattr_ref *ref);
122 void ext4_fs_put_xattr_ref(struct ext4_xattr_ref *ref);
124 int ext4_fs_set_xattr(struct ext4_xattr_ref *ref, uint8_t name_index,
125 const char *name, size_t name_len, const void *data,
126 size_t data_size, bool replace);
128 int ext4_fs_remove_xattr(struct ext4_xattr_ref *ref, uint8_t name_index,
129 const char *name, size_t name_len);
131 int ext4_fs_get_xattr(struct ext4_xattr_ref *ref, uint8_t name_index,
132 const char *name, size_t name_len, void *buf,
133 size_t buf_size, size_t *data_size);
135 void ext4_fs_xattr_iterate(struct ext4_xattr_ref *ref,
136 int (*iter)(struct ext4_xattr_ref *ref,
137 struct ext4_xattr_item *item));
139 void ext4_fs_xattr_iterate_reset(struct ext4_xattr_ref *ref);
141 const char *ext4_extract_xattr_name(const char *full_name, size_t full_name_len,
142 uint8_t *name_index, size_t *name_len,
145 const char *ext4_get_xattr_name_prefix(uint8_t name_index,
146 size_t *ret_prefix_len);