2 * This program is free software; you can redistribute it and/or
3 * modify it under the terms of the GNU General Public
4 * License v2 as published by the Free Software Foundation.
6 * This program is distributed in the hope that it will be useful,
7 * but WITHOUT ANY WARRANTY; without even the implied warranty of
8 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
9 * General Public License for more details.
11 * You should have received a copy of the GNU General Public
12 * License along with this program; if not, write to the
13 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
14 * Boston, MA 021110-1307, USA.
22 #include <sys/ioctl.h>
27 #include "kerncompat.h"
34 static const char * const device_cmd_group_usage[] = {
35 "btrfs device <command> [<args>]",
39 static const char * const cmd_add_dev_usage[] = {
40 "btrfs device add [options] <device> [<device>...] <path>",
41 "Add a device to a filesystem",
42 "-K|--nodiscard do not perform whole device TRIM",
43 "-f|--force force overwrite existing filesystem on the disk",
47 static int cmd_add_dev(int argc, char **argv)
50 int i, fdmnt, ret=0, e;
51 DIR *dirstream = NULL;
58 static struct option long_options[] = {
59 { "nodiscard", optional_argument, NULL, 'K'},
60 { "force", no_argument, NULL, 'f'},
63 int c = getopt_long(argc, argv, "Kf", long_options,
75 usage(cmd_add_dev_usage);
81 if (check_argc_min(argc, 2))
82 usage(cmd_add_dev_usage);
84 mntpnt = argv[optind + argc - 1];
86 fdmnt = open_file_or_dir(mntpnt, &dirstream);
88 fprintf(stderr, "ERROR: can't access '%s'\n", mntpnt);
92 for (i = optind; i < optind + argc - 1; i++){
93 struct btrfs_ioctl_vol_args ioctl_args;
95 u64 dev_block_count = 0;
98 res = test_dev_for_mkfs(argv[i], force, estr);
100 fprintf(stderr, "%s", estr);
105 devfd = open(argv[i], O_RDWR);
107 fprintf(stderr, "ERROR: Unable to open device '%s'\n", argv[i]);
112 res = btrfs_prepare_device(devfd, argv[i], 1, &dev_block_count,
120 strncpy_null(ioctl_args.name, argv[i]);
121 res = ioctl(fdmnt, BTRFS_IOC_ADD_DEV, &ioctl_args);
124 fprintf(stderr, "ERROR: error adding the device '%s' - %s\n",
125 argv[i], strerror(e));
132 close_file_or_dir(fdmnt, dirstream);
136 static const char * const cmd_rm_dev_usage[] = {
137 "btrfs device delete <device> [<device>...] <path>",
138 "Remove a device from a filesystem",
142 static int cmd_rm_dev(int argc, char **argv)
145 int i, fdmnt, ret=0, e;
146 DIR *dirstream = NULL;
148 if (check_argc_min(argc, 3))
149 usage(cmd_rm_dev_usage);
151 mntpnt = argv[argc - 1];
153 fdmnt = open_file_or_dir(mntpnt, &dirstream);
155 fprintf(stderr, "ERROR: can't access '%s'\n", mntpnt);
159 for(i=1 ; i < argc - 1; i++ ){
160 struct btrfs_ioctl_vol_args arg;
163 if (!is_block_device(argv[i])) {
165 "ERROR: %s is not a block device\n", argv[i]);
169 strncpy_null(arg.name, argv[i]);
170 res = ioctl(fdmnt, BTRFS_IOC_RM_DEV, &arg);
174 "ERROR: error removing the device '%s' - %s\n",
175 argv[i], btrfs_err_str(res));
177 } else if (res < 0) {
179 "ERROR: error removing the device '%s' - %s\n",
180 argv[i], strerror(e));
185 close_file_or_dir(fdmnt, dirstream);
189 static const char * const cmd_scan_dev_usage[] = {
190 "btrfs device scan [options] [<device> [<device>...]]",
191 "Scan devices for a btrfs filesystem",
192 "-d|--all-devices scan all devices under /dev",
196 static int cmd_scan_dev(int argc, char **argv)
199 int where = BTRFS_SCAN_LBLKID;
207 static struct option long_options[] = {
208 { "all-devices", no_argument, NULL, 'd'},
211 int c = getopt_long(argc, argv, "d", long_options,
217 where = BTRFS_SCAN_DEV;
221 usage(cmd_scan_dev_usage);
225 if (all && check_argc_max(argc, 2))
226 usage(cmd_scan_dev_usage);
228 if (all || argc == 1) {
229 printf("Scanning for Btrfs filesystems\n");
230 ret = scan_for_btrfs(where, BTRFS_UPDATE_KERNEL);
232 fprintf(stderr, "ERROR: error %d while scanning\n", ret);
236 fd = open("/dev/btrfs-control", O_RDWR);
238 perror("failed to open /dev/btrfs-control");
243 for( i = devstart ; i < argc ; i++ ){
244 struct btrfs_ioctl_vol_args args;
246 if (!is_block_device(argv[i])) {
248 "ERROR: %s is not a block device\n", argv[i]);
252 printf("Scanning for Btrfs filesystems in '%s'\n", argv[i]);
254 strncpy_null(args.name, argv[i]);
256 * FIXME: which are the error code returned by this ioctl ?
257 * it seems that is impossible to understand if there no is
258 * a btrfs filesystem from an I/O error !!!
260 ret = ioctl(fd, BTRFS_IOC_SCAN_DEV, &args);
264 fprintf(stderr, "ERROR: unable to scan the device '%s' - %s\n",
265 argv[i], strerror(e));
276 static const char * const cmd_ready_dev_usage[] = {
277 "btrfs device ready <device>",
278 "Check device to see if it has all of it's devices in cache for mounting",
282 static int cmd_ready_dev(int argc, char **argv)
284 struct btrfs_ioctl_vol_args args;
288 if (check_argc_min(argc, 2))
289 usage(cmd_ready_dev_usage);
291 fd = open("/dev/btrfs-control", O_RDWR);
293 perror("failed to open /dev/btrfs-control");
296 if (!is_block_device(argv[1])) {
298 "ERROR: %s is not a block device\n", argv[1]);
303 strncpy(args.name, argv[argc - 1], BTRFS_PATH_NAME_MAX);
304 ret = ioctl(fd, BTRFS_IOC_DEVICES_READY, &args);
306 fprintf(stderr, "ERROR: unable to determine if the device '%s'"
307 " is ready for mounting - %s\n", argv[argc - 1],
316 static const char * const cmd_dev_stats_usage[] = {
317 "btrfs device stats [-z] <path>|<device>",
318 "Show current device IO stats. -z to reset stats afterwards.",
322 static int cmd_dev_stats(int argc, char **argv)
325 struct btrfs_ioctl_fs_info_args fi_args;
326 struct btrfs_ioctl_dev_info_args *di_args = NULL;
333 DIR *dirstream = NULL;
336 while ((c = getopt(argc, argv, "z")) != -1) {
339 flags = BTRFS_DEV_STATS_RESET;
343 usage(cmd_dev_stats_usage);
347 argc = argc - optind;
348 if (check_argc_exact(argc, 1))
349 usage(cmd_dev_stats_usage);
351 dev_path = argv[optind];
353 fdmnt = open_path_or_dev_mnt(dev_path, &dirstream);
356 fprintf(stderr, "ERROR: can't access '%s'\n", dev_path);
360 ret = get_fs_info(dev_path, &fi_args, &di_args);
362 fprintf(stderr, "ERROR: getting dev info for devstats failed: "
363 "%s\n", strerror(-ret));
367 if (!fi_args.num_devices) {
368 fprintf(stderr, "ERROR: no devices found\n");
373 for (i = 0; i < fi_args.num_devices; i++) {
374 struct btrfs_ioctl_get_dev_stats args = {0};
375 __u8 path[BTRFS_DEVICE_PATH_NAME_MAX + 1];
377 strncpy((char *)path, (char *)di_args[i].path,
378 BTRFS_DEVICE_PATH_NAME_MAX);
379 path[BTRFS_DEVICE_PATH_NAME_MAX] = '\0';
381 args.devid = di_args[i].devid;
382 args.nr_items = BTRFS_DEV_STAT_VALUES_MAX;
385 if (ioctl(fdmnt, BTRFS_IOC_GET_DEV_STATS, &args) < 0) {
387 "ERROR: ioctl(BTRFS_IOC_GET_DEV_STATS) on %s failed: %s\n",
388 path, strerror(errno));
391 if (args.nr_items >= BTRFS_DEV_STAT_WRITE_ERRS + 1)
392 printf("[%s].write_io_errs %llu\n",
394 (unsigned long long) args.values[
395 BTRFS_DEV_STAT_WRITE_ERRS]);
396 if (args.nr_items >= BTRFS_DEV_STAT_READ_ERRS + 1)
397 printf("[%s].read_io_errs %llu\n",
399 (unsigned long long) args.values[
400 BTRFS_DEV_STAT_READ_ERRS]);
401 if (args.nr_items >= BTRFS_DEV_STAT_FLUSH_ERRS + 1)
402 printf("[%s].flush_io_errs %llu\n",
404 (unsigned long long) args.values[
405 BTRFS_DEV_STAT_FLUSH_ERRS]);
406 if (args.nr_items >= BTRFS_DEV_STAT_CORRUPTION_ERRS + 1)
407 printf("[%s].corruption_errs %llu\n",
409 (unsigned long long) args.values[
410 BTRFS_DEV_STAT_CORRUPTION_ERRS]);
411 if (args.nr_items >= BTRFS_DEV_STAT_GENERATION_ERRS + 1)
412 printf("[%s].generation_errs %llu\n",
414 (unsigned long long) args.values[
415 BTRFS_DEV_STAT_GENERATION_ERRS]);
421 close_file_or_dir(fdmnt, dirstream);
426 const struct cmd_group device_cmd_group = {
427 device_cmd_group_usage, NULL, {
428 { "add", cmd_add_dev, cmd_add_dev_usage, NULL, 0 },
429 { "delete", cmd_rm_dev, cmd_rm_dev_usage, NULL, 0 },
430 { "scan", cmd_scan_dev, cmd_scan_dev_usage, NULL, 0 },
431 { "ready", cmd_ready_dev, cmd_ready_dev_usage, NULL, 0 },
432 { "stats", cmd_dev_stats, cmd_dev_stats_usage, NULL, 0 },
437 int cmd_device(int argc, char **argv)
439 return handle_command_group(&device_cmd_group, argc, argv);