-
Notifications
You must be signed in to change notification settings - Fork 0
/
pk_scst.go
381 lines (351 loc) · 9.28 KB
/
pk_scst.go
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
package pk_scst
import (
"errors"
"fmt"
"io"
"io/fs"
"os"
"path"
"path/filepath"
"strings"
log "github.com/sirupsen/logrus"
)
const SCST_ROOT_PATH string = "/sys/kernel/scst_tgt"
const SCST_DEVICES string = SCST_ROOT_PATH + "/devices"
const SCST_ISCSI_TARGETS string = SCST_ROOT_PATH + "/targets/iscsi"
const SYSFS_SCST_DEV_MGMT string = SCST_ROOT_PATH + "/handlers/vdisk_blockio/mgmt"
const SYSFS_SCST_LUNS_MGMT string = "/ini_groups/allowed_ini/luns/mgmt"
const SYSFS_SCST_LUN0_DEV string = "ini_groups/allowed_ini/luns/0/device"
type ScstBlockDevice struct {
Name string
Filename string
}
func readParamsFromDir(dirpath string) (map[string]string, error) {
var (
res map[string]string
err error
val []byte
)
res = make(map[string]string)
if dataDir, err := os.Open(dirpath); err != nil {
return res, err
} else {
if files, err := dataDir.ReadDir(0); err != nil {
return res, err
} else {
for _, v := range files {
if f, err := os.Open(path.Join(dirpath, v.Name())); err != nil {
res[v.Name()] = err.Error()
} else {
if val, err = io.ReadAll(f); err != nil {
res[v.Name()] = err.Error()
}
res[v.Name()] = strings.TrimSuffix(string(val), "\n")
res[v.Name()] = strings.TrimSuffix(res[v.Name()], "\n[key]")
res[v.Name()] = strings.TrimSuffix(res[v.Name()], "\n[key]\n")
res[v.Name()] = strings.TrimSuffix(res[v.Name()], "\n")
}
}
}
}
return res, err
}
func ReadFromDir(dirpath string) ([]string, error) {
var (
res []string
err error
)
if dataDir, err := os.Open(dirpath); err != nil {
return res, err
} else {
if files, err := dataDir.ReadDir(0); err != nil {
return res, err
} else {
for _, v := range files {
res = append(res, v.Name())
}
}
}
return res, err
}
func listSubDirs(dirPath string) (res []string, err error) {
var (
dir *os.File
dirContent []fs.DirEntry
)
if dir, err = os.Open(dirPath); err != nil {
log.Println(err.Error())
} else {
if dirContent, err = dir.ReadDir(0); err != nil {
log.Println(err.Error())
} else {
for _, v := range dirContent {
if v.IsDir() {
res = append(res, v.Name())
}
}
}
}
return
}
func ScstGetDevices() ([]string, error) {
var (
res []string
scstDevices []fs.DirEntry
err error
)
if scstDevicesDir, err := os.Open(SCST_DEVICES); err != nil {
log.Error(err.Error())
} else {
if scstDevices, err = scstDevicesDir.ReadDir(0); err != nil {
log.Error(err.Error())
} else {
for _, v := range scstDevices {
res = append(res, v.Name())
}
}
}
return res, err
}
func ScstGetIscsiTargets() (res []string, err error) {
if res, err = listSubDirs(SCST_ISCSI_TARGETS); err != nil {
err = fmt.Errorf("ScstGetIscsiTargets: cannot get iSCSI targets: %w", err)
}
return res, err
}
func ScstFindWwn(tgtId string) (res string, err error) {
var (
targets []string
)
if targets, err = ScstGetIscsiTargets(); err != nil {
log.Println(err.Error())
} else {
for _, v := range targets {
tgtId2 := strings.Split(v, ":")
if tgtId == tgtId2[len(tgtId2)-1] {
res = v
break
}
}
if res == "" {
err = fmt.Errorf("target with id %s not found", tgtId)
}
}
return
}
func ScstGetDeviceParam(device string, param string) string {
var (
paramPath string
res string
)
paramPath = SCST_DEVICES + "/" + device + "/" + param
deviceParam, err := os.Open(paramPath)
if err != nil {
res = ""
} else {
deviceParamData, err := io.ReadAll(deviceParam)
if err != nil {
res = ""
}
res = strings.Split(string(deviceParamData), "\n")[0]
}
return res
}
func ScstGetIscsiTargetParam(wwn string, param string) (res string, err error) {
var (
paramPath string = SCST_ISCSI_TARGETS + "/" + wwn + "/" + param
)
if deviceParam, err := os.Open(paramPath); err != nil {
res = ""
} else {
if deviceParamData, err := io.ReadAll(deviceParam); err != nil {
res = ""
} else {
res = strings.Split(string(deviceParamData), "\n")[0]
}
}
return
}
func scstSetDeviceParam(device string, param string, val string) (err error) {
var (
paramPath string = SCST_DEVICES + "/" + device + "/" + param
)
if deviceParam, err := os.OpenFile(paramPath, os.O_WRONLY, 0644); err != nil {
log.Println(err)
} else {
defer deviceParam.Close()
deviceParamW, err := deviceParam.Write([]byte(val))
if err != nil {
log.Println(err)
}
log.Printf("Wrote %d bytes.\n", deviceParamW)
}
return
}
func ScstGetDeviceParams(device string) (res map[string]string, err error) {
if res, err = readParamsFromDir(path.Join(SCST_DEVICES, device)); err != nil {
log.Error(err.Error())
}
return
}
func ScstGetIscsiTargetParams(target string) (res map[string]string, err error) {
var (
wwn string
)
res = make(map[string]string)
if wwn, err = ScstFindWwn(target); err != nil {
log.Println(err.Error())
} else {
if res, err = readParamsFromDir(path.Join(SCST_ISCSI_TARGETS, wwn)); err != nil {
log.Println(err.Error())
}
res["wwn"] = wwn
}
return
}
func ScstDeleteDevice(device string) (err error) {
scstCmd := []byte("del_device " + device)
if mgmt, err := os.OpenFile(SYSFS_SCST_DEV_MGMT, os.O_WRONLY, 0644); err != nil {
log.Println(err.Error())
} else {
defer mgmt.Close()
if _, err := mgmt.Write(scstCmd); err != nil {
log.Println(err.Error())
} else {
log.Printf("Device %s deleted \n", device)
}
}
return
}
func ScstDeactivateDevice(device string) (err error) {
var (
mgmt *os.File
)
scstCmd := []byte("0")
scstCmdPath := path.Join(SCST_DEVICES, device, "active")
if mgmt, err = os.OpenFile(scstCmdPath, os.O_WRONLY, 0644); err != nil {
//log.Println(err.Error())
err = fmt.Errorf("ScstDeactivateDevice: cannot deactivate device: %w", err)
} else {
defer mgmt.Close()
if _, err = mgmt.Write(scstCmd); err != nil {
//log.Println(err.Error())
err = fmt.Errorf("ScstDeactivateDevice: cannot deactivate device: %w", err)
}
}
return
}
func ScstActivateDevice(device string) (err error) {
var (
mgmt *os.File
)
scstCmd := []byte("1")
scstCmdPath := path.Join(SCST_DEVICES, device, "active")
if mgmt, err = os.OpenFile(scstCmdPath, os.O_WRONLY, 0644); err != nil {
log.Println(err.Error())
} else {
defer mgmt.Close()
if _, err = mgmt.Write(scstCmd); err != nil {
log.Println(err.Error())
} else {
log.Printf("Device %s activated \n", device)
}
}
return
}
func ScstCreateLun(devId string, fileName string) (err error) {
var (
lunPathMgmt string
wwn string
targets []string
)
if targets, err = ScstGetIscsiTargets(); err != nil {
log.Println(err.Error())
} else {
for _, v := range targets {
if strings.Contains(v, devId) {
wwn = v
break
}
}
if wwn != "" {
if mgmt, err := os.OpenFile(SYSFS_SCST_DEV_MGMT, os.O_WRONLY, 0644); err != nil {
err = errors.New("cannot open SCST device management interface")
log.Println(err.Error())
} else {
defer mgmt.Close()
scstCmd := "add_device " + devId + " filename=" + fileName + "; nv_cache=1; rotational=0"
if _, err := mgmt.Write([]byte(scstCmd)); err != nil {
log.Println(err.Error())
} else {
log.Printf("Device %s backed by %s added\n", devId, fileName)
lunPathMgmt = SCST_ISCSI_TARGETS + "/" + wwn + SYSFS_SCST_LUNS_MGMT
if mgmt, err = os.OpenFile(lunPathMgmt, os.O_WRONLY, 0644); err != nil {
log.Println(err.Error())
} else {
defer mgmt.Close()
scstCmd = "add " + devId + " 0"
if _, err := mgmt.Write([]byte(scstCmd)); err != nil {
log.Println(err.Error())
} else {
log.Printf("LUN 0 with device %s exported via target %s\n", devId, wwn)
if err = scstSetDeviceParam(devId, "t10_vend_id", "FREE_TT"); err != nil {
log.Println(err.Error())
}
}
}
}
}
} else {
err = fmt.Errorf("target %s not found", devId)
log.Println(err.Error())
}
}
return err
}
func ScstListIscsiSessions(target string) (res []string, err error) {
var (
sessionsPath string
wwn string
)
if wwn, err = ScstFindWwn(target); err != nil {
log.Println(err.Error())
} else {
sessionsPath = path.Join(SCST_ISCSI_TARGETS, wwn, "sessions")
if res, err = ReadFromDir(sessionsPath); err != nil {
log.Println(err.Error())
}
}
return
}
func ScstGetLunDevice(target string, lun int) (device ScstBlockDevice, err error) {
lunPath := path.Join(SCST_ISCSI_TARGETS, target, fmt.Sprintf("ini_groups/allowed_ini/luns/%d/device", lun))
if lunDevice, err := filepath.EvalSymlinks(lunPath); err != nil {
fmt.Printf("error resolving LUN %d path for %s", lun, target)
} else {
if lunFile, err := os.Open(path.Join(lunDevice, "filename")); err != nil {
fmt.Printf("error opening %s\n", lunDevice)
} else {
if lunFilename, err := io.ReadAll(lunFile); err != nil {
fmt.Printf("error opening %s\n %s\n", lunFile.Name(), err.Error())
} else {
//filename = strings.Split(string(lunFilename), "\n")[0]
device.Name = filepath.Base(lunDevice)
if len(string(lunFilename)) > 0 {
device.Filename = strings.Split(string(lunFilename), "\n")[0]
}
}
}
}
return
}
func ScstGetIscsiTargetSessions(target string) (sessions []string) {
var (
err error
)
sessionsPath := path.Join(SCST_ISCSI_TARGETS, target, "sessions")
if sessions, err = listSubDirs(sessionsPath); err != nil {
log.Errorf("error reading sessions for target %s", target)
}
return
}