blob: f7cb0b236aeb6fff9d870c5d9a15210aee8d37a2 [file] [log] [blame]
/*
* Copyright (C) 2012 STRATO. All rights reserved.
*
* 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 <time.h>
#include <assert.h>
#include <inttypes.h>
#include <sys/wait.h>
#include "kerncompat.h"
#include "ctree.h"
#include "ioctl.h"
#include "utils.h"
#include "volumes.h"
#include "disk-io.h"
#include "commands.h"
static int print_replace_status(int fd, const char *path, int once);
static char *time2string(char *buf, size_t s, __u64 t);
static char *progress2string(char *buf, size_t s, int progress_1000);
static const char *replace_dev_result2string(__u64 result)
{
switch (result) {
case BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR:
return "no error";
case BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED:
return "not started";
case BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED:
return "already started";
default:
return "<illegal result value>";
}
}
static const char * const replace_cmd_group_usage[] = {
"btrfs replace <command> [<args>]",
NULL
};
static int is_numerical(const char *str)
{
if (!(*str >= '0' && *str <= '9'))
return 0;
while (*str >= '0' && *str <= '9')
str++;
if (*str != '\0')
return 0;
return 1;
}
static int dev_replace_cancel_fd = -1;
static void dev_replace_sigint_handler(int signal)
{
int ret;
struct btrfs_ioctl_dev_replace_args args = {0};
args.cmd = BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL;
ret = ioctl(dev_replace_cancel_fd, BTRFS_IOC_DEV_REPLACE, &args);
if (ret < 0)
perror("Device replace cancel failed");
}
static int dev_replace_handle_sigint(int fd)
{
struct sigaction sa = {
.sa_handler = fd == -1 ? SIG_DFL : dev_replace_sigint_handler
};
dev_replace_cancel_fd = fd;
return sigaction(SIGINT, &sa, NULL);
}
static const char *const cmd_start_replace_usage[] = {
"btrfs replace start [-Bfr] <srcdev>|<devid> <targetdev> <mount_point>",
"Replace device of a btrfs filesystem.",
"On a live filesystem, duplicate the data to the target device which",
"is currently stored on the source device. If the source device is not",
"available anymore, or if the -r option is set, the data is built",
"only using the RAID redundancy mechanisms. After completion of the",
"operation, the source device is removed from the filesystem.",
"If the <srcdev> is a numerical value, it is assumed to be the device id",
"of the filesystem which is mounted at <mount_point>, otherwise it is",
"the path to the source device. If the source device is disconnected,",
"from the system, you have to use the <devid> parameter format.",
"The <targetdev> needs to be same size or larger than the <srcdev>.",
"",
"-r only read from <srcdev> if no other zero-defect mirror exists",
" (enable this if your drive has lots of read errors, the access",
" would be very slow)",
"-f force using and overwriting <targetdev> even if it looks like",
" containing a valid btrfs filesystem. A valid filesystem is",
" assumed if a btrfs superblock is found which contains a",
" correct checksum. Devices which are currently mounted are",
" never allowed to be used as the <targetdev>",
"-B do not background",
NULL
};
static int cmd_start_replace(int argc, char **argv)
{
struct btrfs_ioctl_dev_replace_args start_args = {0};
struct btrfs_ioctl_dev_replace_args status_args = {0};
int ret;
int i;
int c;
int fdmnt = -1;
int fdsrcdev = -1;
int fddstdev = -1;
char *path;
char *srcdev;
char *dstdev = NULL;
int avoid_reading_from_srcdev = 0;
int force_using_targetdev = 0;
struct stat st;
u64 dstdev_block_count;
int do_not_background = 0;
int mixed = 0;
DIR *dirstream = NULL;
char estr[100]; /* check test_dev_for_mkfs() for error string size*/
while ((c = getopt(argc, argv, "Brf")) != -1) {
switch (c) {
case 'B':
do_not_background = 1;
break;
case 'r':
avoid_reading_from_srcdev = 1;
break;
case 'f':
force_using_targetdev = 1;
break;
case '?':
default:
usage(cmd_start_replace_usage);
}
}
start_args.start.cont_reading_from_srcdev_mode =
avoid_reading_from_srcdev ?
BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID :
BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS;
if (check_argc_exact(argc - optind, 3))
usage(cmd_start_replace_usage);
path = argv[optind + 2];
fdmnt = open_path_or_dev_mnt(path, &dirstream);
if (fdmnt < 0) {
if (errno == EINVAL)
fprintf(stderr,
"ERROR: '%s' is not a mounted btrfs device\n",
path);
else
fprintf(stderr, "ERROR: can't access '%s': %s\n",
path, strerror(errno));
goto leave_with_error;
}
/* check for possible errors before backgrounding */
status_args.cmd = BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS;
status_args.result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_RESULT;
ret = ioctl(fdmnt, BTRFS_IOC_DEV_REPLACE, &status_args);
if (ret) {
fprintf(stderr,
"ERROR: ioctl(DEV_REPLACE_STATUS) failed on \"%s\": %s",
path, strerror(errno));
if (status_args.result != BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_RESULT)
fprintf(stderr, ", %s\n",
replace_dev_result2string(status_args.result));
else
fprintf(stderr, "\n");
goto leave_with_error;
}
if (status_args.result != BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR) {
fprintf(stderr,
"ERROR: ioctl(DEV_REPLACE_STATUS) on \"%s\" returns error: %s\n",
path, replace_dev_result2string(status_args.result));
goto leave_with_error;
}
if (status_args.status.replace_state ==
BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED) {
fprintf(stderr,
"ERROR: btrfs replace on \"%s\" already started!\n",
path);
goto leave_with_error;
}
srcdev = argv[optind];
dstdev = canonicalize_path(argv[optind + 1]);
if (!dstdev) {
fprintf(stderr,
"ERROR: Could not canonicalize path '%s': %s\n",
argv[optind + 1], strerror(errno));
goto leave_with_error;
}
if (is_numerical(srcdev)) {
struct btrfs_ioctl_fs_info_args fi_args;
struct btrfs_ioctl_dev_info_args *di_args = NULL;
start_args.start.srcdevid = arg_strtou64(srcdev);
ret = get_fs_info(path, &fi_args, &di_args);
if (ret) {
fprintf(stderr, "ERROR: getting dev info for devstats failed: "
"%s\n", strerror(-ret));
free(di_args);
goto leave_with_error;
}
if (!fi_args.num_devices) {
fprintf(stderr, "ERROR: no devices found\n");
free(di_args);
goto leave_with_error;
}
for (i = 0; i < fi_args.num_devices; i++)
if (start_args.start.srcdevid == di_args[i].devid)
break;
free(di_args);
if (i == fi_args.num_devices) {
fprintf(stderr, "Error: '%s' is not a valid devid for filesystem '%s'\n",
srcdev, path);
goto leave_with_error;
}
} else {
fdsrcdev = open(srcdev, O_RDWR);
if (fdsrcdev < 0) {
fprintf(stderr, "Error: Unable to open device '%s'\n",
srcdev);
fprintf(stderr, "\tTry using the devid instead of the path\n");
goto leave_with_error;
}
ret = fstat(fdsrcdev, &st);
if (ret) {
fprintf(stderr, "Error: Unable to stat '%s'\n", srcdev);
goto leave_with_error;
}
if (!S_ISBLK(st.st_mode)) {
fprintf(stderr, "Error: '%s' is not a block device\n",
srcdev);
goto leave_with_error;
}
strncpy((char *)start_args.start.srcdev_name, srcdev,
BTRFS_DEVICE_PATH_NAME_MAX);
close(fdsrcdev);
fdsrcdev = -1;
start_args.start.srcdevid = 0;
}
ret = test_dev_for_mkfs(dstdev, force_using_targetdev, estr);
if (ret) {
fprintf(stderr, "%s", estr);
goto leave_with_error;
}
fddstdev = open(dstdev, O_RDWR);
if (fddstdev < 0) {
fprintf(stderr, "Unable to open %s\n", dstdev);
goto leave_with_error;
}
strncpy((char *)start_args.start.tgtdev_name, dstdev,
BTRFS_DEVICE_PATH_NAME_MAX);
ret = btrfs_prepare_device(fddstdev, dstdev, 1, &dstdev_block_count, 0,
&mixed, 0);
if (ret)
goto leave_with_error;
close(fddstdev);
fddstdev = -1;
free(dstdev);
dstdev = NULL;
dev_replace_handle_sigint(fdmnt);
if (!do_not_background) {
if (daemon(0, 0) < 0) {
fprintf(stderr, "ERROR, backgrounding failed: %s\n",
strerror(errno));
goto leave_with_error;
}
}
start_args.cmd = BTRFS_IOCTL_DEV_REPLACE_CMD_START;
start_args.result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_RESULT;
ret = ioctl(fdmnt, BTRFS_IOC_DEV_REPLACE, &start_args);
if (do_not_background) {
if (ret) {
fprintf(stderr,
"ERROR: ioctl(DEV_REPLACE_START) failed on \"%s\": %s",
path, strerror(errno));
if (start_args.result != BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_RESULT)
fprintf(stderr, ", %s\n",
replace_dev_result2string(start_args.result));
else
fprintf(stderr, "\n");
if (errno == EOPNOTSUPP)
fprintf(stderr,
"WARNING: dev_replace does not yet handle RAID5/6\n");
goto leave_with_error;
}
if (start_args.result !=
BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR) {
fprintf(stderr,
"ERROR: ioctl(DEV_REPLACE_START) on \"%s\" returns error: %s\n",
path,
replace_dev_result2string(start_args.result));
goto leave_with_error;
}
}
close_file_or_dir(fdmnt, dirstream);
return 0;
leave_with_error:
if (dstdev)
free(dstdev);
if (fdmnt != -1)
close(fdmnt);
if (fdsrcdev != -1)
close(fdsrcdev);
if (fddstdev != -1)
close(fddstdev);
return 1;
}
static const char *const cmd_status_replace_usage[] = {
"btrfs replace status [-1] <mount_point>",
"Print status and progress information of a running device replace",
"operation",
"",
"-1 print once instead of print continuously until the replace",
" operation finishes (or is canceled)",
NULL
};
static int cmd_status_replace(int argc, char **argv)
{
int fd;
int e;
int c;
char *path;
int once = 0;
int ret;
DIR *dirstream = NULL;
while ((c = getopt(argc, argv, "1")) != -1) {
switch (c) {
case '1':
once = 1;
break;
case '?':
default:
usage(cmd_status_replace_usage);
}
}
if (check_argc_exact(argc - optind, 1))
usage(cmd_status_replace_usage);
path = argv[optind];
fd = open_file_or_dir(path, &dirstream);
e = errno;
if (fd < 0) {
fprintf(stderr, "ERROR: can't access \"%s\": %s\n",
path, strerror(e));
return 1;
}
ret = print_replace_status(fd, path, once);
close_file_or_dir(fd, dirstream);
return !!ret;
}
static int print_replace_status(int fd, const char *path, int once)
{
struct btrfs_ioctl_dev_replace_args args = {0};
struct btrfs_ioctl_dev_replace_status_params *status;
int ret;
int prevent_loop = 0;
int skip_stats;
int num_chars;
char string1[80];
char string2[80];
char string3[80];
for (;;) {
args.cmd = BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS;
args.result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_RESULT;
ret = ioctl(fd, BTRFS_IOC_DEV_REPLACE, &args);
if (ret) {
fprintf(stderr, "ERROR: ioctl(DEV_REPLACE_STATUS) failed on \"%s\": %s",
path, strerror(errno));
if (args.result != BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_RESULT)
fprintf(stderr, ", %s\n",
replace_dev_result2string(args.result));
else
fprintf(stderr, "\n");
return ret;
}
status = &args.status;
if (args.result != BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR) {
fprintf(stderr, "ERROR: ioctl(DEV_REPLACE_STATUS) on \"%s\" returns error: %s\n",
path,
replace_dev_result2string(args.result));
return -1;
}
skip_stats = 0;
num_chars = 0;
switch (status->replace_state) {
case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
num_chars =
printf("%s done",
progress2string(string3,
sizeof(string3),
status->progress_1000));
break;
case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
prevent_loop = 1;
printf("Started on %s, finished on %s",
time2string(string1, sizeof(string1),
status->time_started),
time2string(string2, sizeof(string2),
status->time_stopped));
break;
case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
prevent_loop = 1;
printf("Started on %s, canceled on %s at %s",
time2string(string1, sizeof(string1),
status->time_started),
time2string(string2, sizeof(string2),
status->time_stopped),
progress2string(string3, sizeof(string3),
status->progress_1000));
break;
case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
prevent_loop = 1;
printf("Started on %s, suspended on %s at %s",
time2string(string1, sizeof(string1),
status->time_started),
time2string(string2, sizeof(string2),
status->time_stopped),
progress2string(string3, sizeof(string3),
status->progress_1000));
break;
case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
prevent_loop = 1;
skip_stats = 1;
printf("Never started");
break;
default:
prevent_loop = 1;
fprintf(stderr,
"Unknown btrfs dev replace status:%llu",
status->replace_state);
ret = -EINVAL;
break;
}
if (!skip_stats)
num_chars += printf(
", %llu write errs, %llu uncorr. read errs",
(unsigned long long)status->num_write_errors,
(unsigned long long)
status->num_uncorrectable_read_errors);
if (once || prevent_loop || ret) {
printf("\n");
return ret;
}
fflush(stdout);
sleep(1);
while (num_chars > 0) {
putchar('\b');
num_chars--;
}
}
return 0;
}
static char *
time2string(char *buf, size_t s, __u64 t)
{
struct tm t_tm;
time_t t_time_t;
t_time_t = (time_t)t;
assert((__u64)t_time_t == t);
localtime_r(&t_time_t, &t_tm);
strftime(buf, s, "%e.%b %T", &t_tm);
return buf;
}
static char *
progress2string(char *buf, size_t s, int progress_1000)
{
snprintf(buf, s, "%d.%01d%%", progress_1000 / 10, progress_1000 % 10);
assert(s > 0);
buf[s - 1] = '\0';
return buf;
}
static const char *const cmd_cancel_replace_usage[] = {
"btrfs replace cancel <mount_point>",
"Cancel a running device replace operation.",
NULL
};
static int cmd_cancel_replace(int argc, char **argv)
{
struct btrfs_ioctl_dev_replace_args args = {0};
int ret;
int c;
int fd;
int e;
char *path;
DIR *dirstream = NULL;
while ((c = getopt(argc, argv, "")) != -1) {
switch (c) {
case '?':
default:
usage(cmd_cancel_replace_usage);
}
}
if (check_argc_exact(argc - optind, 1))
usage(cmd_cancel_replace_usage);
path = argv[optind];
fd = open_file_or_dir(path, &dirstream);
if (fd < 0) {
fprintf(stderr, "ERROR: can't access \"%s\": %s\n",
path, strerror(errno));
return 1;
}
args.cmd = BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL;
args.result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_RESULT;
ret = ioctl(fd, BTRFS_IOC_DEV_REPLACE, &args);
e = errno;
close_file_or_dir(fd, dirstream);
if (ret) {
fprintf(stderr, "ERROR: ioctl(DEV_REPLACE_CANCEL) failed on \"%s\": %s",
path, strerror(e));
if (args.result != BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_RESULT)
fprintf(stderr, ", %s\n",
replace_dev_result2string(args.result));
else
fprintf(stderr, "\n");
return 1;
}
if (args.result == BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED) {
printf("INFO: ioctl(DEV_REPLACE_CANCEL)\"%s\": %s\n",
path, replace_dev_result2string(args.result));
return 2;
}
return 0;
}
const struct cmd_group replace_cmd_group = {
replace_cmd_group_usage, NULL, {
{ "start", cmd_start_replace, cmd_start_replace_usage, NULL,
0 },
{ "status", cmd_status_replace, cmd_status_replace_usage, NULL,
0 },
{ "cancel", cmd_cancel_replace, cmd_cancel_replace_usage, NULL,
0 },
NULL_CMD_STRUCT
}
};
int cmd_replace(int argc, char **argv)
{
return handle_command_group(&replace_cmd_group, argc, argv);
}