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
|
/*
Copyright (c) 2019 Red Hat, Inc. <http://www.redhat.com>
This file is part of GlusterFS.
This file is licensed to you under your choice of the GNU Lesser
General Public License, version 3 or any later version (LGPLv3 or
later), or the GNU General Public License, version 2 (GPLv2), in all
cases as published by the Free Software Foundation.
*/
#include <stdlib.h>
#include <endian.h>
#include <stdio.h>
#include <time.h>
#include <string.h>
#include <inttypes.h>
#include <sys/types.h>
#include <sys/xattr.h>
#include <errno.h>
typedef struct gf_timespec_disk {
uint64_t tv_sec;
uint64_t tv_nsec;
} gf_timespec_disk_t;
/* posix_mdata_t on disk structure */
typedef struct __attribute__((__packed__)) posix_mdata_disk {
/* version of structure, bumped up if any new member is added */
uint8_t version;
/* flags indicates valid fields in the structure */
uint64_t flags;
gf_timespec_disk_t ctime;
gf_timespec_disk_t mtime;
gf_timespec_disk_t atime;
} posix_mdata_disk_t;
/* In memory representation posix metadata xattr */
typedef struct {
/* version of structure, bumped up if any new member is added */
uint8_t version;
/* flags indicates valid fields in the structure */
uint64_t flags;
struct timespec ctime;
struct timespec mtime;
struct timespec atime;
} posix_mdata_t;
#define GF_XATTR_MDATA_KEY "trusted.glusterfs.mdata"
/* posix_mdata_from_disk converts posix_mdata_disk_t into host byte order
*/
static inline void
posix_mdata_from_disk(posix_mdata_t *out, posix_mdata_disk_t *in)
{
out->version = in->version;
out->flags = be64toh(in->flags);
out->ctime.tv_sec = be64toh(in->ctime.tv_sec);
out->ctime.tv_nsec = be64toh(in->ctime.tv_nsec);
out->mtime.tv_sec = be64toh(in->mtime.tv_sec);
out->mtime.tv_nsec = be64toh(in->mtime.tv_nsec);
out->atime.tv_sec = be64toh(in->atime.tv_sec);
out->atime.tv_nsec = be64toh(in->atime.tv_nsec);
}
/* posix_fetch_mdata_xattr fetches the posix_mdata_t from disk */
static int
posix_fetch_mdata_xattr(const char *real_path, posix_mdata_t *metadata)
{
size_t size = -1;
char *value = NULL;
char gfid_str[64] = {0};
char *key = GF_XATTR_MDATA_KEY;
if (!metadata || !real_path) {
goto err;
}
/* Get size */
size = lgetxattr(real_path, key, NULL, 0);
if (size == -1) {
goto err;
}
value = calloc(size + 1, sizeof(char));
if (!value) {
goto err;
}
/* Get xattr value */
size = lgetxattr(real_path, key, value, size);
if (size == -1) {
goto err;
}
posix_mdata_from_disk(metadata, (posix_mdata_disk_t *)value);
out:
if (value)
free(value);
return 0;
err:
if (value)
free(value);
return -1;
}
int
main(int argc, char *argv[])
{
posix_mdata_t metadata;
uint64_t result;
if (argc != 3) {
/*
Usage: get_mdata_xattr -c|-m|-a <file-name>
where -c --> ctime
-m --> mtime
-a --> atime
*/
printf("-1");
goto err;
}
if (posix_fetch_mdata_xattr(argv[2], &metadata)) {
printf("-1");
goto err;
}
switch (argv[1][1]) {
case 'c':
result = metadata.ctime.tv_sec;
break;
case 'm':
result = metadata.mtime.tv_sec;
break;
case 'a':
result = metadata.atime.tv_sec;
break;
default:
printf("-1");
goto err;
}
printf("%" PRIu64, result);
fflush(stdout);
return 0;
err:
fflush(stdout);
return -1;
}
|
