2 * Copyright (C) 2012 STRATO. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
24 #include <sys/ioctl.h>
32 #include "kerncompat.h"
42 static int print_replace_status(int fd, const char *path, int once);
43 static char *time2string(char *buf, size_t s, __u64 t);
44 static char *progress2string(char *buf, size_t s, int progress_1000);
47 static const char *replace_dev_result2string(__u64 result)
50 case BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR:
52 case BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED:
54 case BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED:
55 return "already started";
57 return "<illegal result value>";
61 static const char * const replace_cmd_group_usage[] = {
62 "btrfs replace <command> [<args>]",
66 static int is_numerical(const char *str)
68 if (!(*str >= '0' && *str <= '9'))
70 while (*str >= '0' && *str <= '9')
77 static int dev_replace_cancel_fd = -1;
78 static void dev_replace_sigint_handler(int signal)
80 struct btrfs_ioctl_dev_replace_args args = {0};
82 args.cmd = BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL;
83 ioctl(dev_replace_cancel_fd, BTRFS_IOC_DEV_REPLACE, &args);
86 static int dev_replace_handle_sigint(int fd)
88 struct sigaction sa = {
89 .sa_handler = fd == -1 ? SIG_DFL : dev_replace_sigint_handler
92 dev_replace_cancel_fd = fd;
93 return sigaction(SIGINT, &sa, NULL);
96 static const char *const cmd_start_replace_usage[] = {
97 "btrfs replace start srcdev|devid targetdev [-Bfr] mount_point",
98 "Replace device of a btrfs filesystem.",
99 "On a live filesystem, duplicate the data to the target device which",
100 "is currently stored on the source device. If the source device is not",
101 "available anymore, or if the -r option is set, the data is built",
102 "only using the RAID redundancy mechanisms. After completion of the",
103 "operation, the source device is removed from the filesystem.",
104 "If the srcdev is a numerical value, it is assumed to be the device id",
105 "of the filesystem which is mounted at mount_point, otherwise it is",
106 "the path to the source device. If the source device is disconnected,",
107 "from the system, you have to use the devid parameter format.",
108 "The targetdev needs to be same size or larger than the srcdev.",
110 "-r only read from srcdev if no other zero-defect mirror exists",
111 " (enable this if your drive has lots of read errors, the access",
112 " would be very slow)",
113 "-f force using and overwriting targetdev even if it looks like",
114 " containing a valid btrfs filesystem. A valid filesystem is",
115 " assumed if a btrfs superblock is found which contains a",
116 " correct checksum. Devices which are currently mounted are",
117 " never allowed to be used as the targetdev",
118 "-B do not background",
122 static int cmd_start_replace(int argc, char **argv)
124 struct btrfs_ioctl_dev_replace_args start_args = {0};
125 struct btrfs_ioctl_dev_replace_args status_args = {0};
135 int avoid_reading_from_srcdev = 0;
136 int force_using_targetdev = 0;
138 struct btrfs_fs_devices *fs_devices_mnt = NULL;
140 u64 dstdev_block_count;
141 int do_not_background = 0;
144 while ((c = getopt(argc, argv, "Brf")) != -1) {
147 do_not_background = 1;
150 avoid_reading_from_srcdev = 1;
153 force_using_targetdev = 1;
157 usage(cmd_start_replace_usage);
161 start_args.start.cont_reading_from_srcdev_mode =
162 avoid_reading_from_srcdev ?
163 BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID :
164 BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS;
165 if (check_argc_exact(argc - optind, 3))
166 usage(cmd_start_replace_usage);
167 path = argv[optind + 2];
168 fdmnt = open_file_or_dir(path);
170 fprintf(stderr, "ERROR: can't access \"%s\": %s\n",
171 path, strerror(errno));
172 goto leave_with_error;
175 /* check for possible errors before backgrounding */
176 status_args.cmd = BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS;
177 ret = ioctl(fdmnt, BTRFS_IOC_DEV_REPLACE, &status_args);
180 "ERROR: ioctl(DEV_REPLACE_STATUS) failed on \"%s\": %s, %s\n",
181 path, strerror(errno),
182 replace_dev_result2string(status_args.result));
183 goto leave_with_error;
186 if (status_args.result != BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR) {
188 "ERROR: ioctl(DEV_REPLACE_STATUS) on \"%s\" returns error: %s\n",
189 path, replace_dev_result2string(status_args.result));
190 goto leave_with_error;
193 if (status_args.status.replace_state ==
194 BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED) {
196 "ERROR: btrfs replace on \"%s\" already started!\n",
198 goto leave_with_error;
201 srcdev = argv[optind];
202 dstdev = argv[optind + 1];
204 if (is_numerical(srcdev)) {
205 struct btrfs_ioctl_fs_info_args fi_args;
206 struct btrfs_ioctl_dev_info_args *di_args = NULL;
208 if (atoi(srcdev) == 0) {
209 fprintf(stderr, "Error: Failed to parse the numerical devid value '%s'\n",
211 goto leave_with_error;
213 start_args.start.srcdevid = (__u64)atoi(srcdev);
215 ret = get_fs_info(fdmnt, path, &fi_args, &di_args);
217 fprintf(stderr, "ERROR: getting dev info for devstats failed: "
218 "%s\n", strerror(-ret));
220 goto leave_with_error;
222 if (!fi_args.num_devices) {
223 fprintf(stderr, "ERROR: no devices found\n");
225 goto leave_with_error;
228 for (i = 0; i < fi_args.num_devices; i++)
229 if (start_args.start.srcdevid == di_args[i].devid)
232 if (i == fi_args.num_devices) {
233 fprintf(stderr, "Error: '%s' is not a valid devid for filesystem '%s'\n",
235 goto leave_with_error;
238 fdsrcdev = open(srcdev, O_RDWR);
240 fprintf(stderr, "Error: Unable to open device '%s'\n",
242 goto leave_with_error;
244 ret = fstat(fdsrcdev, &st);
246 fprintf(stderr, "Error: Unable to stat '%s'\n", srcdev);
247 goto leave_with_error;
249 if (!S_ISBLK(st.st_mode)) {
250 fprintf(stderr, "Error: '%s' is not a block device\n",
252 goto leave_with_error;
254 strncpy((char *)start_args.start.srcdev_name, srcdev,
255 BTRFS_DEVICE_PATH_NAME_MAX);
258 start_args.start.srcdevid = 0;
261 ret = check_mounted(dstdev);
263 fprintf(stderr, "Error checking %s mount status\n", dstdev);
264 goto leave_with_error;
268 "Error, target device %s is in use and currently mounted!\n",
270 goto leave_with_error;
272 fddstdev = open(dstdev, O_RDWR);
274 fprintf(stderr, "Unable to open %s\n", dstdev);
275 goto leave_with_error;
277 ret = btrfs_scan_one_device(fddstdev, dstdev, &fs_devices_mnt,
278 &total_devs, BTRFS_SUPER_INFO_OFFSET);
279 if (ret >= 0 && !force_using_targetdev) {
281 "Error, target device %s contains filesystem, use '-f' to force overwriting.\n",
283 goto leave_with_error;
285 ret = fstat(fddstdev, &st);
287 fprintf(stderr, "Error: Unable to stat '%s'\n", dstdev);
288 goto leave_with_error;
290 if (!S_ISBLK(st.st_mode)) {
291 fprintf(stderr, "Error: '%s' is not a block device\n", dstdev);
292 goto leave_with_error;
294 strncpy((char *)start_args.start.tgtdev_name, dstdev,
295 BTRFS_DEVICE_PATH_NAME_MAX);
296 if (btrfs_prepare_device(fddstdev, dstdev, 1, &dstdev_block_count, 0,
298 fprintf(stderr, "Error: Failed to prepare device '%s'\n",
300 goto leave_with_error;
305 dev_replace_handle_sigint(fdmnt);
306 if (!do_not_background) {
307 if (daemon(0, 0) < 0) {
308 fprintf(stderr, "ERROR, backgrounding failed: %s\n",
310 goto leave_with_error;
314 start_args.cmd = BTRFS_IOCTL_DEV_REPLACE_CMD_START;
315 ret = ioctl(fdmnt, BTRFS_IOC_DEV_REPLACE, &start_args);
316 if (do_not_background) {
319 "ERROR: ioctl(DEV_REPLACE_START) failed on \"%s\": %s, %s\n",
320 path, strerror(errno),
321 replace_dev_result2string(start_args.result));
322 goto leave_with_error;
325 if (start_args.result !=
326 BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR) {
328 "ERROR: ioctl(DEV_REPLACE_START) on \"%s\" returns error: %s\n",
330 replace_dev_result2string(start_args.result));
331 goto leave_with_error;
347 static const char *const cmd_status_replace_usage[] = {
348 "btrfs replace status mount_point [-1]",
349 "Print status and progress information of a running device replace",
352 "-1 print once instead of print continously until the replace",
353 " operation finishes (or is canceled)",
357 static int cmd_status_replace(int argc, char **argv)
366 while ((c = getopt(argc, argv, "1")) != -1) {
373 usage(cmd_status_replace_usage);
377 if (check_argc_exact(argc - optind, 1))
378 usage(cmd_status_replace_usage);
381 fd = open_file_or_dir(path);
384 fprintf(stderr, "ERROR: can't access \"%s\": %s\n",
389 ret = print_replace_status(fd, path, once);
394 static int print_replace_status(int fd, const char *path, int once)
396 struct btrfs_ioctl_dev_replace_args args = {0};
397 struct btrfs_ioctl_dev_replace_status_params *status;
399 int prevent_loop = 0;
407 args.cmd = BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS;
408 ret = ioctl(fd, BTRFS_IOC_DEV_REPLACE, &args);
410 fprintf(stderr, "ERROR: ioctl(DEV_REPLACE_STATUS) failed on \"%s\": %s, %s\n",
411 path, strerror(errno),
412 replace_dev_result2string(args.result));
416 status = &args.status;
417 if (args.result != BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR) {
418 fprintf(stderr, "ERROR: ioctl(DEV_REPLACE_STATUS) on \"%s\" returns error: %s\n",
420 replace_dev_result2string(args.result));
426 switch (status->replace_state) {
427 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
430 progress2string(string3,
432 status->progress_1000));
434 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
436 printf("Started on %s, finished on %s",
437 time2string(string1, sizeof(string1),
438 status->time_started),
439 time2string(string2, sizeof(string2),
440 status->time_stopped));
442 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
444 printf("Started on %s, canceled on %s at %s",
445 time2string(string1, sizeof(string1),
446 status->time_started),
447 time2string(string2, sizeof(string2),
448 status->time_stopped),
449 progress2string(string3, sizeof(string3),
450 status->progress_1000));
452 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
454 printf("Started on %s, suspended on %s at %s",
455 time2string(string1, sizeof(string1),
456 status->time_started),
457 time2string(string2, sizeof(string2),
458 status->time_stopped),
459 progress2string(string3, sizeof(string3),
460 status->progress_1000));
462 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
465 printf("Never started");
475 ", %llu write errs, %llu uncorr. read errs",
476 (unsigned long long)status->num_write_errors,
478 status->num_uncorrectable_read_errors);
479 if (once || prevent_loop) {
486 while (num_chars > 0) {
496 time2string(char *buf, size_t s, __u64 t)
501 t_time_t = (time_t)t;
502 assert((__u64)t_time_t == t);
503 localtime_r(&t_time_t, &t_tm);
504 strftime(buf, s, "%e.%b %T", &t_tm);
509 progress2string(char *buf, size_t s, int progress_1000)
511 snprintf(buf, s, "%d.%01d%%", progress_1000 / 10, progress_1000 % 10);
517 static const char *const cmd_cancel_replace_usage[] = {
518 "btrfs replace cancel mount_point",
519 "Cancel a running device replace operation.",
523 static int cmd_cancel_replace(int argc, char **argv)
525 struct btrfs_ioctl_dev_replace_args args = {0};
532 while ((c = getopt(argc, argv, "")) != -1) {
536 usage(cmd_cancel_replace_usage);
540 if (check_argc_exact(argc - optind, 1))
541 usage(cmd_cancel_replace_usage);
544 fd = open_file_or_dir(path);
546 fprintf(stderr, "ERROR: can't access \"%s\": %s\n",
547 path, strerror(errno));
551 args.cmd = BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL;
552 ret = ioctl(fd, BTRFS_IOC_DEV_REPLACE, &args);
556 fprintf(stderr, "ERROR: ioctl(DEV_REPLACE_CANCEL) failed on \"%s\": %s, %s\n",
558 replace_dev_result2string(args.result));
565 const struct cmd_group replace_cmd_group = {
566 replace_cmd_group_usage, NULL, {
567 { "start", cmd_start_replace, cmd_start_replace_usage, NULL,
569 { "status", cmd_status_replace, cmd_status_replace_usage, NULL,
571 { "cancel", cmd_cancel_replace, cmd_cancel_replace_usage, NULL,
577 int cmd_replace(int argc, char **argv)
579 return handle_command_group(&replace_cmd_group, argc, argv);