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
|
// SPDX-License-Identifier: GPL-2.0+
/*
* Created by Li Guifu <bluce.lee@aliyun.com>
*/
#include <string.h>
#include <stdlib.h>
#include "erofs/err.h"
#include "erofs/list.h"
#include "erofs/print.h"
#include "erofs/exclude.h"
#define EXCLUDE_RULE_EXACT_SIZE offsetof(struct erofs_exclude_rule, reg)
#define EXCLUDE_RULE_REGEX_SIZE sizeof(struct erofs_exclude_rule)
static LIST_HEAD(exclude_head);
static LIST_HEAD(regex_exclude_head);
static void dump_regerror(int errcode, const char *s, const regex_t *preg)
{
char str[512];
regerror(errcode, preg, str, sizeof(str));
erofs_err("invalid regex %s (%s)\n", s, str);
}
static struct erofs_exclude_rule *erofs_insert_exclude(const char *s,
bool is_regex)
{
struct erofs_exclude_rule *r;
int ret;
struct list_head *h;
r = malloc(is_regex ? EXCLUDE_RULE_REGEX_SIZE :
EXCLUDE_RULE_EXACT_SIZE);
if (!r)
return ERR_PTR(-ENOMEM);
r->pattern = strdup(s);
if (!r->pattern) {
ret = -ENOMEM;
goto err_rule;
}
if (is_regex) {
ret = regcomp(&r->reg, s, REG_EXTENDED|REG_NOSUB);
if (ret) {
dump_regerror(ret, s, &r->reg);
goto err_rule;
}
h = ®ex_exclude_head;
} else {
h = &exclude_head;
}
list_add_tail(&r->list, h);
erofs_info("insert exclude %s: %s\n",
is_regex ? "regex" : "path", s);
return r;
err_rule:
if (r->pattern)
free(r->pattern);
free(r);
return ERR_PTR(ret);
}
void erofs_cleanup_exclude_rules(void)
{
struct erofs_exclude_rule *r, *n;
struct list_head *h;
h = &exclude_head;
list_for_each_entry_safe(r, n, h, list) {
list_del(&r->list);
free(r->pattern);
free(r);
}
h = ®ex_exclude_head;
list_for_each_entry_safe(r, n, h, list) {
list_del(&r->list);
free(r->pattern);
regfree(&r->reg);
free(r);
}
}
int erofs_parse_exclude_path(const char *args, bool is_regex)
{
struct erofs_exclude_rule *r = erofs_insert_exclude(args, is_regex);
if (IS_ERR(r)) {
erofs_cleanup_exclude_rules();
return PTR_ERR(r);
}
return 0;
}
struct erofs_exclude_rule *erofs_is_exclude_path(const char *dir,
const char *name)
{
char buf[PATH_MAX];
const char *s;
struct erofs_exclude_rule *r;
if (!dir) {
/* no prefix */
s = name;
} else {
sprintf(buf, "%s/%s", dir, name);
s = buf;
}
s = erofs_fspath(s);
list_for_each_entry(r, &exclude_head, list) {
if (!strcmp(r->pattern, s))
return r;
}
list_for_each_entry(r, ®ex_exclude_head, list) {
int ret = regexec(&r->reg, s, (size_t)0, NULL, 0);
if (!ret)
return r;
if (ret != REG_NOMATCH)
dump_regerror(ret, s, &r->reg);
}
return NULL;
}
|
