summaryrefslogtreecommitdiff
path: root/cmds-device.c
blob: 4bbf4017fbdf06b268057f55fa9f76d0939ab1a2 (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
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
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License v2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <sys/stat.h>

#include "kerncompat.h"
#include "ctree.h"
#include "ioctl.h"
#include "utils.h"

#include "commands.h"

/* FIXME - imported cruft, fix sparse errors and warnings */
#ifdef __CHECKER__
#define BLKGETSIZE64 0
#define BTRFS_IOC_SNAP_CREATE_V2 0
#define BTRFS_VOL_NAME_MAX 255
struct btrfs_ioctl_vol_args { char name[BTRFS_VOL_NAME_MAX]; };
static inline int ioctl(int fd, int define, void *arg) { return 0; }
#endif

static const char * const device_cmd_group_usage[] = {
	"btrfs device <command> [<args>]",
	NULL
};

static const char * const cmd_add_dev_usage[] = {
	"btrfs device add <device> [<device>...] <path>",
	"Add a device to a filesystem",
	NULL
};

static int cmd_add_dev(int argc, char **argv)
{
	char	*mntpnt;
	int	i, fdmnt, ret=0, e;
	DIR	*dirstream = NULL;

	if (check_argc_min(argc, 3))
		usage(cmd_add_dev_usage);

	mntpnt = argv[argc - 1];

	fdmnt = open_file_or_dir(mntpnt, &dirstream);
	if (fdmnt < 0) {
		fprintf(stderr, "ERROR: can't access to '%s'\n", mntpnt);
		return 12;
	}

	for (i = 1; i < argc - 1; i++ ){
		struct btrfs_ioctl_vol_args ioctl_args;
		int	devfd, res;
		u64 dev_block_count = 0;
		struct stat st;
		int mixed = 0;

		res = check_mounted(argv[i]);
		if (res < 0) {
			fprintf(stderr, "error checking %s mount status\n",
				argv[i]);
			ret++;
			continue;
		}
		if (res == 1) {
			fprintf(stderr, "%s is mounted\n", argv[i]);
			ret++;
			continue;
		}

		devfd = open(argv[i], O_RDWR);
		if (devfd < 0) {
			fprintf(stderr, "ERROR: Unable to open device '%s'\n", argv[i]);
			ret++;
			continue;
		}
		res = fstat(devfd, &st);
		if (res) {
			fprintf(stderr, "ERROR: Unable to stat '%s'\n", argv[i]);
			close(devfd);
			ret++;
			continue;
		}
		if (!S_ISBLK(st.st_mode)) {
			fprintf(stderr, "ERROR: '%s' is not a block device\n", argv[i]);
			close(devfd);
			ret++;
			continue;
		}

		res = btrfs_prepare_device(devfd, argv[i], 1, &dev_block_count,
					   0, &mixed, 0);
		if (res) {
			fprintf(stderr, "ERROR: Unable to init '%s'\n", argv[i]);
			close(devfd);
			ret++;
			continue;
		}
		close(devfd);

		strncpy_null(ioctl_args.name, argv[i]);
		res = ioctl(fdmnt, BTRFS_IOC_ADD_DEV, &ioctl_args);
		e = errno;
		if(res<0){
			fprintf(stderr, "ERROR: error adding the device '%s' - %s\n",
				argv[i], strerror(e));
			ret++;
		}

	}

	close_file_or_dir(fdmnt, dirstream);
	if (ret)
		return ret+20;
	else
		return 0;
}

static const char * const cmd_rm_dev_usage[] = {
	"btrfs device delete <device> [<device>...] <path>",
	"Remove a device from a filesystem",
	NULL
};

static int cmd_rm_dev(int argc, char **argv)
{
	char	*mntpnt;
	int	i, fdmnt, ret=0, e;
	DIR	*dirstream = NULL;

	if (check_argc_min(argc, 3))
		usage(cmd_rm_dev_usage);

	mntpnt = argv[argc - 1];

	fdmnt = open_file_or_dir(mntpnt, &dirstream);
	if (fdmnt < 0) {
		fprintf(stderr, "ERROR: can't access to '%s'\n", mntpnt);
		return 12;
	}

	for(i=1 ; i < argc - 1; i++ ){
		struct	btrfs_ioctl_vol_args arg;
		int	res;

		strncpy_null(arg.name, argv[i]);
		res = ioctl(fdmnt, BTRFS_IOC_RM_DEV, &arg);
		e = errno;
		if(res<0){
			fprintf(stderr, "ERROR: error removing the device '%s' - %s\n",
				argv[i], strerror(e));
			ret++;
		}
	}

	close_file_or_dir(fdmnt, dirstream);
	if( ret)
		return ret+20;
	else
		return 0;
}

static const char * const cmd_scan_dev_usage[] = {
	"btrfs device scan [<--all-devices>|<device> [<device>...]]",
	"Scan devices for a btrfs filesystem",
	NULL
};

static int cmd_scan_dev(int argc, char **argv)
{
	int	i, fd, e;
	int	checklist = 1;
	int	devstart = 1;

	if( argc > 1 && !strcmp(argv[1],"--all-devices")){
		if (check_argc_max(argc, 2))
			usage(cmd_scan_dev_usage);

		checklist = 0;
		devstart += 1;
	}

	if(argc<=devstart){

		int ret;

		printf("Scanning for Btrfs filesystems\n");
		if(checklist)
			ret = btrfs_scan_block_devices(1);
		else
			ret = btrfs_scan_one_dir("/dev", 1);
		if (ret){
			fprintf(stderr, "ERROR: error %d while scanning\n", ret);
			return 18;
		}
		return 0;
	}

	fd = open("/dev/btrfs-control", O_RDWR);
	if (fd < 0) {
		perror("failed to open /dev/btrfs-control");
		return 10;
	}

	for( i = devstart ; i < argc ; i++ ){
		struct btrfs_ioctl_vol_args args;
		int ret;

		printf("Scanning for Btrfs filesystems in '%s'\n", argv[i]);

		strncpy_null(args.name, argv[i]);
		/*
		 * FIXME: which are the error code returned by this ioctl ?
		 * it seems that is impossible to understand if there no is
		 * a btrfs filesystem from an I/O error !!!
		 */
		ret = ioctl(fd, BTRFS_IOC_SCAN_DEV, &args);
		e = errno;

		if( ret < 0 ){
			close(fd);
			fprintf(stderr, "ERROR: unable to scan the device '%s' - %s\n",
				argv[i], strerror(e));
			return 11;
		}
	}

	close(fd);
	return 0;
}

static const char * const cmd_ready_dev_usage[] = {
	"btrfs device ready <device>",
	"Check device to see if it has all of it's devices in cache for mounting",
	NULL
};

static int cmd_ready_dev(int argc, char **argv)
{
	struct	btrfs_ioctl_vol_args args;
	int	fd;
	int	ret;

	if (check_argc_min(argc, 2))
		usage(cmd_ready_dev_usage);

	fd = open("/dev/btrfs-control", O_RDWR);
	if (fd < 0) {
		perror("failed to open /dev/btrfs-control");
		return 10;
	}

	strncpy(args.name, argv[argc - 1], BTRFS_PATH_NAME_MAX);
	ret = ioctl(fd, BTRFS_IOC_DEVICES_READY, &args);
	if (ret < 0) {
		fprintf(stderr, "ERROR: unable to determine if the device '%s'"
			" is ready for mounting - %s\n", argv[argc - 1],
			strerror(errno));
		ret = 1;
	}

	close(fd);
	return ret;
}

static const char * const cmd_dev_stats_usage[] = {
	"btrfs device stats [-z] <path>|<device>",
	"Show current device IO stats. -z to reset stats afterwards.",
	NULL
};

static int cmd_dev_stats(int argc, char **argv)
{
	char *path;
	struct btrfs_ioctl_fs_info_args fi_args;
	struct btrfs_ioctl_dev_info_args *di_args = NULL;
	int ret;
	int fdmnt;
	int i;
	int c;
	int err = 0;
	__u64 flags = 0;
	DIR *dirstream = NULL;

	optind = 1;
	while ((c = getopt(argc, argv, "z")) != -1) {
		switch (c) {
		case 'z':
			flags = BTRFS_DEV_STATS_RESET;
			break;
		case '?':
		default:
			fprintf(stderr, "ERROR: device stat args invalid.\n"
					" device stat [-z] <path>|<device>\n"
					" -z  to reset stats after reading.\n");
			return 1;
		}
	}

	if (optind + 1 != argc) {
		fprintf(stderr, "ERROR: device stat needs path|device as single"
			" argument\n");
		return 1;
	}

	path = argv[optind];

	fdmnt = open_path_or_dev_mnt(path, &dirstream);

	if (fdmnt < 0) {
		fprintf(stderr, "ERROR: can't access '%s'\n", path);
		return 12;
	}

	ret = get_fs_info(path, &fi_args, &di_args);
	if (ret) {
		fprintf(stderr, "ERROR: getting dev info for devstats failed: "
				"%s\n", strerror(-ret));
		err = 1;
		goto out;
	}
	if (!fi_args.num_devices) {
		fprintf(stderr, "ERROR: no devices found\n");
		err = 1;
		goto out;
	}

	for (i = 0; i < fi_args.num_devices; i++) {
		struct btrfs_ioctl_get_dev_stats args = {0};
		__u8 path[BTRFS_DEVICE_PATH_NAME_MAX + 1];

		strncpy((char *)path, (char *)di_args[i].path,
			BTRFS_DEVICE_PATH_NAME_MAX);
		path[BTRFS_DEVICE_PATH_NAME_MAX] = '\0';

		args.devid = di_args[i].devid;
		args.nr_items = BTRFS_DEV_STAT_VALUES_MAX;
		args.flags = flags;

		if (ioctl(fdmnt, BTRFS_IOC_GET_DEV_STATS, &args) < 0) {
			fprintf(stderr,
				"ERROR: ioctl(BTRFS_IOC_GET_DEV_STATS) on %s failed: %s\n",
				path, strerror(errno));
			err = 1;
		} else {
			if (args.nr_items >= BTRFS_DEV_STAT_WRITE_ERRS + 1)
				printf("[%s].write_io_errs   %llu\n",
				       path,
				       (unsigned long long) args.values[
					BTRFS_DEV_STAT_WRITE_ERRS]);
			if (args.nr_items >= BTRFS_DEV_STAT_READ_ERRS + 1)
				printf("[%s].read_io_errs    %llu\n",
				       path,
				       (unsigned long long) args.values[
					BTRFS_DEV_STAT_READ_ERRS]);
			if (args.nr_items >= BTRFS_DEV_STAT_FLUSH_ERRS + 1)
				printf("[%s].flush_io_errs   %llu\n",
				       path,
				       (unsigned long long) args.values[
					BTRFS_DEV_STAT_FLUSH_ERRS]);
			if (args.nr_items >= BTRFS_DEV_STAT_CORRUPTION_ERRS + 1)
				printf("[%s].corruption_errs %llu\n",
				       path,
				       (unsigned long long) args.values[
					BTRFS_DEV_STAT_CORRUPTION_ERRS]);
			if (args.nr_items >= BTRFS_DEV_STAT_GENERATION_ERRS + 1)
				printf("[%s].generation_errs %llu\n",
				       path,
				       (unsigned long long) args.values[
					BTRFS_DEV_STAT_GENERATION_ERRS]);
		}
	}

out:
	free(di_args);
	close_file_or_dir(fdmnt, dirstream);

	return err;
}

const struct cmd_group device_cmd_group = {
	device_cmd_group_usage, NULL, {
		{ "add", cmd_add_dev, cmd_add_dev_usage, NULL, 0 },
		{ "delete", cmd_rm_dev, cmd_rm_dev_usage, NULL, 0 },
		{ "scan", cmd_scan_dev, cmd_scan_dev_usage, NULL, 0 },
		{ "ready", cmd_ready_dev, cmd_ready_dev_usage, NULL, 0 },
		{ "stats", cmd_dev_stats, cmd_dev_stats_usage, NULL, 0 },
		{ 0, 0, 0, 0, 0 }
	}
};

int cmd_device(int argc, char **argv)
{
	return handle_command_group(&device_cmd_group, argc, argv);
}