blob: 1bf98e91cc26fc9553e26c2b2830925a6a2399c6 (
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
|
/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
/* Copyright (c) 2021 Hengqi Chen */
#include <vmlinux.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include "bits.bpf.h"
#include "fsdist.h"
#define MAX_ENTRIES 10240
const volatile pid_t target_pid = 0;
const volatile bool in_ms = false;
struct {
__uint(type, BPF_MAP_TYPE_HASH);
__uint(max_entries, MAX_ENTRIES);
__type(key, __u32);
__type(value, __u64);
} starts SEC(".maps");
struct hist hists[F_MAX_OP] = {};
static int probe_entry()
{
__u64 pid_tgid = bpf_get_current_pid_tgid();
__u32 pid = pid_tgid >> 32;
__u32 tid = (__u32)pid_tgid;
__u64 ts;
if (target_pid && target_pid != pid)
return 0;
ts = bpf_ktime_get_ns();
bpf_map_update_elem(&starts, &tid, &ts, BPF_ANY);
return 0;
}
static int probe_return(enum fs_file_op op)
{
__u32 tid = (__u32)bpf_get_current_pid_tgid();
__u64 ts = bpf_ktime_get_ns();
__u64 *tsp, slot;
__s64 delta;
tsp = bpf_map_lookup_elem(&starts, &tid);
if (!tsp)
return 0;
if (op >= F_MAX_OP)
goto cleanup;
delta = (__s64)(ts - *tsp);
if (delta < 0)
goto cleanup;
if (in_ms)
delta /= 1000000;
else
delta /= 1000;
slot = log2l(delta);
if (slot >= MAX_SLOTS)
slot = MAX_SLOTS - 1;
__sync_fetch_and_add(&hists[op].slots[slot], 1);
cleanup:
bpf_map_delete_elem(&starts, &tid);
return 0;
}
SEC("kprobe/dummy_file_read")
int BPF_KPROBE(file_read_entry)
{
return probe_entry();
}
SEC("kretprobe/dummy_file_read")
int BPF_KRETPROBE(file_read_exit)
{
return probe_return(F_READ);
}
SEC("kprobe/dummy_file_write")
int BPF_KPROBE(file_write_entry)
{
return probe_entry();
}
SEC("kretprobe/dummy_file_write")
int BPF_KRETPROBE(file_write_exit)
{
return probe_return(F_WRITE);
}
SEC("kprobe/dummy_file_open")
int BPF_KPROBE(file_open_entry)
{
return probe_entry();
}
SEC("kretprobe/dummy_file_open")
int BPF_KRETPROBE(file_open_exit)
{
return probe_return(F_OPEN);
}
SEC("kprobe/dummy_file_sync")
int BPF_KPROBE(file_sync_entry)
{
return probe_entry();
}
SEC("kretprobe/dummy_file_sync")
int BPF_KRETPROBE(file_sync_exit)
{
return probe_return(F_FSYNC);
}
SEC("kprobe/dummy_getattr")
int BPF_KPROBE(getattr_entry)
{
return probe_entry();
}
SEC("kretprobe/dummy_getattr")
int BPF_KRETPROBE(getattr_exit)
{
return probe_return(F_GETATTR);
}
SEC("fentry/dummy_file_read")
int BPF_PROG(file_read_fentry)
{
return probe_entry();
}
SEC("fexit/dummy_file_read")
int BPF_PROG(file_read_fexit)
{
return probe_return(F_READ);
}
SEC("fentry/dummy_file_write")
int BPF_PROG(file_write_fentry)
{
return probe_entry();
}
SEC("fexit/dummy_file_write")
int BPF_PROG(file_write_fexit)
{
return probe_return(F_WRITE);
}
SEC("fentry/dummy_file_open")
int BPF_PROG(file_open_fentry)
{
return probe_entry();
}
SEC("fexit/dummy_file_open")
int BPF_PROG(file_open_fexit)
{
return probe_return(F_OPEN);
}
SEC("fentry/dummy_file_sync")
int BPF_PROG(file_sync_fentry)
{
return probe_entry();
}
SEC("fexit/dummy_file_sync")
int BPF_PROG(file_sync_fexit)
{
return probe_return(F_FSYNC);
}
SEC("fentry/dummy_getattr")
int BPF_PROG(getattr_fentry)
{
return probe_entry();
}
SEC("fexit/dummy_getattr")
int BPF_PROG(getattr_fexit)
{
return probe_return(F_GETATTR);
}
char LICENSE[] SEC("license") = "Dual BSD/GPL";
|
