1 /*
2 * Copyright (C) 2014 Cyril Hrubis chrubis@suse.cz
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it would be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
11 *
12 * Further, this software is distributed without any warranty that it is
13 * free of the rightful claim of any third person regarding infringement
14 * or the like. Any license provided herein, whether implied or
15 * otherwise, applies only to this software file. Patent licenses, if
16 * any, provided herein do not apply to combinations of this program with
17 * other software, or any other product whatsoever.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write the Free Software Foundation, Inc.,
21 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
22 */
23
24 #include <sys/types.h>
25 #include <sys/stat.h>
26 #include <sys/ioctl.h>
27 #include <sys/mount.h>
28 #include <errno.h>
29 #include <unistd.h>
30 #include <stdlib.h>
31 #include <linux/loop.h>
32 #include <stdint.h>
33 #include <inttypes.h>
34 #include "lapi/syscalls.h"
35 #include "test.h"
36 #include "safe_macros.h"
37
38 #ifndef LOOP_CTL_GET_FREE
39 # define LOOP_CTL_GET_FREE 0x4C82
40 #endif
41
42 #define LOOP_CONTROL_FILE "/dev/loop-control"
43
44 #define DEV_FILE "test_dev.img"
45 #define DEV_SIZE_MB 256u
46
47 static char dev_path[1024];
48 static int device_acquired;
49 static unsigned long prev_dev_sec_write;
50
51 static const char *dev_variants[] = {
52 "/dev/loop%i",
53 "/dev/loop/%i",
54 "/dev/block/loop%i"
55 };
56
set_dev_path(int dev,char * path,size_t path_len)57 static int set_dev_path(int dev, char *path, size_t path_len)
58 {
59 unsigned int i;
60 struct stat st;
61
62 for (i = 0; i < ARRAY_SIZE(dev_variants); i++) {
63 snprintf(path, path_len, dev_variants[i], dev);
64
65 if (stat(path, &st) == 0 && S_ISBLK(st.st_mode))
66 return 1;
67 }
68
69 return 0;
70 }
71
tst_find_free_loopdev(char * path,size_t path_len)72 int tst_find_free_loopdev(char *path, size_t path_len)
73 {
74 int ctl_fd, dev_fd, rc, i;
75 struct loop_info loopinfo;
76 char buf[1024];
77
78 /* since Linux 3.1 */
79 ctl_fd = open(LOOP_CONTROL_FILE, O_RDWR);
80
81 if (ctl_fd > 0) {
82 rc = ioctl(ctl_fd, LOOP_CTL_GET_FREE);
83 close(ctl_fd);
84 if (rc >= 0) {
85 if (path)
86 set_dev_path(rc, path, path_len);
87 tst_resm(TINFO, "Found free device %d '%s'",
88 rc, path ?: "");
89 return rc;
90 }
91 tst_resm(TINFO, "Couldn't find free loop device");
92 return -1;
93 }
94
95 switch (errno) {
96 case ENOENT:
97 break;
98 case EACCES:
99 tst_resm(TINFO | TERRNO,
100 "Not allowed to open " LOOP_CONTROL_FILE ". "
101 "Are you root?");
102 break;
103 default:
104 tst_resm(TBROK | TERRNO, "Failed to open " LOOP_CONTROL_FILE);
105 }
106
107 /*
108 * Older way is to iterate over /dev/loop%i and /dev/loop/%i and try
109 * LOOP_GET_STATUS ioctl() which fails for free loop devices.
110 */
111 for (i = 0; i < 256; i++) {
112
113 if (!set_dev_path(i, buf, sizeof(buf)))
114 continue;
115
116 dev_fd = open(buf, O_RDONLY);
117
118 if (dev_fd < 0)
119 continue;
120
121 if (ioctl(dev_fd, LOOP_GET_STATUS, &loopinfo) == 0) {
122 tst_resm(TINFO, "Device '%s' in use", buf);
123 } else {
124 if (errno != ENXIO)
125 continue;
126 tst_resm(TINFO, "Found free device '%s'", buf);
127 close(dev_fd);
128 if (path != NULL) {
129 strncpy(path, buf, path_len);
130 path[path_len-1] = '\0';
131 }
132 return i;
133 }
134
135 close(dev_fd);
136 }
137
138 tst_resm(TINFO, "No free devices found");
139
140 return -1;
141 }
142
tst_attach_device(const char * dev,const char * file)143 int tst_attach_device(const char *dev, const char *file)
144 {
145 int dev_fd, file_fd;
146 struct loop_info loopinfo;
147
148 /* b/148978487 */
149 int attach_tries = 20;
150 while (attach_tries--) {
151 dev_fd = open(dev, O_RDWR);
152 if (dev_fd >= 0)
153 break;
154 usleep(50000);
155 }
156 if (dev_fd < 0) {
157 tst_resm(TWARN | TERRNO, "open('%s', O_RDWR) failed", dev);
158 return 1;
159 }
160
161 file_fd = open(file, O_RDWR);
162 if (file_fd < 0) {
163 tst_resm(TWARN | TERRNO, "open('%s', O_RDWR) failed", file);
164 close(dev_fd);
165 return 1;
166 }
167
168 if (ioctl(dev_fd, LOOP_SET_FD, file_fd) < 0) {
169 close(dev_fd);
170 close(file_fd);
171 tst_resm(TWARN | TERRNO, "ioctl(%s, LOOP_SET_FD, %s) failed",
172 dev, file);
173 return 1;
174 }
175
176 /* Old mkfs.btrfs use LOOP_GET_STATUS instead of backing_file to get
177 * associated filename, so we need to set up the device by calling
178 * LOOP_SET_FD and LOOP_SET_STATUS.
179 */
180 memset(&loopinfo, 0, sizeof(loopinfo));
181 strcpy(loopinfo.lo_name, file);
182
183 if (ioctl(dev_fd, LOOP_SET_STATUS, &loopinfo)) {
184 close(dev_fd);
185 close(file_fd);
186 tst_resm(TWARN | TERRNO,
187 "ioctl(%s, LOOP_SET_STATUS, %s) failed", dev, file);
188 return 1;
189 }
190
191 close(dev_fd);
192 close(file_fd);
193 return 0;
194 }
195
tst_detach_device(const char * dev)196 int tst_detach_device(const char *dev)
197 {
198 int dev_fd, ret, i;
199
200 dev_fd = open(dev, O_RDONLY);
201 if (dev_fd < 0) {
202 tst_resm(TWARN | TERRNO, "open(%s) failed", dev);
203 return 1;
204 }
205
206 /* keep trying to clear LOOPDEV until we get ENXIO, a quick succession
207 * of attach/detach might not give udev enough time to complete */
208 for (i = 0; i < 40; i++) {
209 ret = ioctl(dev_fd, LOOP_CLR_FD, 0);
210
211 if (ret && (errno == ENXIO)) {
212 close(dev_fd);
213 return 0;
214 }
215
216 if (ret && (errno != EBUSY)) {
217 tst_resm(TWARN,
218 "ioctl(%s, LOOP_CLR_FD, 0) unexpectedly failed with: %s",
219 dev, tst_strerrno(errno));
220 close(dev_fd);
221 return 1;
222 }
223
224 usleep(50000);
225 }
226
227 close(dev_fd);
228 tst_resm(TWARN,
229 "ioctl(%s, LOOP_CLR_FD, 0) no ENXIO for too long", dev);
230 return 1;
231 }
232
tst_dev_sync(int fd)233 int tst_dev_sync(int fd)
234 {
235 return syscall(__NR_syncfs, fd);
236 }
237
tst_acquire_device__(unsigned int size)238 const char *tst_acquire_device__(unsigned int size)
239 {
240 int fd;
241 char *dev;
242 struct stat st;
243 unsigned int acq_dev_size;
244 uint64_t ltp_dev_size;
245
246 acq_dev_size = MAX(size, DEV_SIZE_MB);
247
248 dev = getenv("LTP_DEV");
249
250 if (dev) {
251 tst_resm(TINFO, "Using test device LTP_DEV='%s'", dev);
252
253 if (stat(dev, &st)) {
254 tst_resm(TWARN | TERRNO, "stat() failed");
255 return NULL;
256 }
257
258 if (!S_ISBLK(st.st_mode)) {
259 tst_resm(TWARN, "%s is not a block device", dev);
260 return NULL;
261 }
262
263 fd = open(dev, O_RDONLY);
264 if (fd < 0) {
265 tst_resm(TWARN | TERRNO,
266 "open(%s, O_RDONLY) failed", dev);
267 return NULL;
268 }
269
270 if (ioctl(fd, BLKGETSIZE64, <p_dev_size)) {
271 tst_resm(TWARN | TERRNO,
272 "ioctl(fd, BLKGETSIZE64, ...) failed");
273 close(fd);
274 return NULL;
275 }
276
277 if (close(fd)) {
278 tst_resm(TWARN | TERRNO,
279 "close(fd) failed");
280 return NULL;
281 }
282
283 ltp_dev_size = ltp_dev_size/1024/1024;
284
285 if (acq_dev_size <= ltp_dev_size)
286 return dev;
287
288 tst_resm(TINFO, "Skipping $LTP_DEV size %"PRIu64"MB, requested size %uMB",
289 ltp_dev_size, acq_dev_size);
290 }
291
292 if (tst_fill_file(DEV_FILE, 0, 1024 * 1024, acq_dev_size)) {
293 tst_resm(TWARN | TERRNO, "Failed to create " DEV_FILE);
294 return NULL;
295 }
296
297 if (tst_find_free_loopdev(dev_path, sizeof(dev_path)) == -1)
298 return NULL;
299
300 if (tst_attach_device(dev_path, DEV_FILE))
301 return NULL;
302
303 device_acquired = 1;
304
305 return dev_path;
306 }
307
tst_acquire_device_(void (cleanup_fn)(void),unsigned int size)308 const char *tst_acquire_device_(void (cleanup_fn)(void), unsigned int size)
309 {
310 const char *device;
311
312 if (device_acquired) {
313 tst_brkm(TBROK, cleanup_fn, "Device already acquired");
314 return NULL;
315 }
316
317 if (!tst_tmpdir_created()) {
318 tst_brkm(TBROK, cleanup_fn,
319 "Cannot acquire device without tmpdir() created");
320 return NULL;
321 }
322
323 device = tst_acquire_device__(size);
324
325 if (!device) {
326 tst_brkm(TBROK, cleanup_fn, "Failed to acquire device");
327 return NULL;
328 }
329
330 return device;
331 }
332
tst_release_device(const char * dev)333 int tst_release_device(const char *dev)
334 {
335 int ret;
336
337 if (!device_acquired)
338 return 0;
339
340 /*
341 * Loop device was created -> we need to detach it.
342 *
343 * The file image is deleted in tst_rmdir();
344 */
345 ret = tst_detach_device(dev);
346
347 device_acquired = 0;
348
349 return ret;
350 }
351
tst_clear_device(const char * dev)352 int tst_clear_device(const char *dev)
353 {
354 if (tst_fill_file(dev, 0, 1024, 512)) {
355 tst_resm(TWARN, "Failed to clear 512k block on %s", dev);
356 return 1;
357 }
358
359 return 0;
360 }
361
tst_umount(const char * path)362 int tst_umount(const char *path)
363 {
364 int err, ret, i;
365
366 for (i = 0; i < 50; i++) {
367 ret = umount(path);
368 err = errno;
369
370 if (!ret)
371 return 0;
372
373 tst_resm(TINFO, "umount('%s') failed with %s, try %2i...",
374 path, tst_strerrno(err), i+1);
375
376 if (i == 0 && err == EBUSY) {
377 tst_resm(TINFO, "Likely gvfsd-trash is probing newly "
378 "mounted fs, kill it to speed up tests.");
379 }
380
381 usleep(100000);
382 }
383
384 tst_resm(TWARN, "Failed to umount('%s') after 50 retries", path);
385 errno = err;
386 return -1;
387 }
388
find_stat_file(const char * dev,char * path,size_t path_len)389 int find_stat_file(const char *dev, char *path, size_t path_len)
390 {
391 const char *devname = strrchr(dev, '/') + 1;
392
393 snprintf(path, path_len, "/sys/block/%s/stat", devname);
394
395 if (!access(path, F_OK))
396 return 1;
397
398 DIR *dir = SAFE_OPENDIR(NULL, "/sys/block/");
399 struct dirent *ent;
400
401 while ((ent = readdir(dir))) {
402 snprintf(path, path_len, "/sys/block/%s/%s/stat", ent->d_name, devname);
403
404 if (!access(path, F_OK)) {
405 SAFE_CLOSEDIR(NULL, dir);
406 return 1;
407 }
408 }
409
410 SAFE_CLOSEDIR(NULL, dir);
411 return 0;
412 }
413
tst_dev_bytes_written(const char * dev)414 unsigned long tst_dev_bytes_written(const char *dev)
415 {
416 unsigned long dev_sec_write = 0, dev_bytes_written, io_ticks = 0;
417 char dev_stat_path[1024];
418
419 if (!find_stat_file(dev, dev_stat_path, sizeof(dev_stat_path)))
420 tst_brkm(TCONF, NULL, "Test device stat file: %s not found",
421 dev_stat_path);
422
423 SAFE_FILE_SCANF(NULL, dev_stat_path,
424 "%*s %*s %*s %*s %*s %*s %lu %*s %*s %lu",
425 &dev_sec_write, &io_ticks);
426
427 if (!io_ticks)
428 tst_brkm(TCONF, NULL, "Test device stat file: %s broken",
429 dev_stat_path);
430
431 dev_bytes_written = (dev_sec_write - prev_dev_sec_write) * 512;
432
433 prev_dev_sec_write = dev_sec_write;
434
435 return dev_bytes_written;
436 }
437