btrfs-progs/cmds-device.c

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/*
* 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 <getopt.h>
#include "kerncompat.h"
#include "ctree.h"
#include "ioctl.h"
#include "utils.h"
#include "volumes.h"
#include "cmds-fi-usage.h"
#include "commands.h"
static const char * const device_cmd_group_usage[] = {
"btrfs device <command> [<args>]",
NULL
};
static const char * const cmd_device_add_usage[] = {
"btrfs device add [options] <device> [<device>...] <path>",
"Add a device to a filesystem",
"-K|--nodiscard do not perform whole device TRIM",
"-f|--force force overwrite existing filesystem on the disk",
NULL
};
static int cmd_device_add(int argc, char **argv)
{
char *mntpnt;
int i, fdmnt, ret=0, e;
DIR *dirstream = NULL;
int discard = 1;
int force = 0;
int last_dev;
while (1) {
int c;
static const struct option long_options[] = {
{ "nodiscard", optional_argument, NULL, 'K'},
{ "force", no_argument, NULL, 'f'},
{ NULL, 0, NULL, 0}
};
c = getopt_long(argc, argv, "Kf", long_options, NULL);
if (c < 0)
break;
switch (c) {
case 'K':
discard = 0;
break;
case 'f':
force = 1;
break;
default:
usage(cmd_device_add_usage);
}
}
if (check_argc_min(argc - optind, 2))
usage(cmd_device_add_usage);
last_dev = argc - 1;
mntpnt = argv[last_dev];
fdmnt = btrfs_open_dir(mntpnt, &dirstream, 1);
if (fdmnt < 0)
return 1;
for (i = optind; i < last_dev; i++){
struct btrfs_ioctl_vol_args ioctl_args;
int devfd, res;
u64 dev_block_count = 0;
char *path;
res = test_dev_for_mkfs(argv[i], force);
if (res) {
ret++;
continue;
}
devfd = open(argv[i], O_RDWR);
if (devfd < 0) {
error("unable to open device '%s'", argv[i]);
ret++;
continue;
}
res = btrfs_prepare_device(devfd, argv[i], 1, &dev_block_count,
Btrfs-progs: Do not force mixed block group creation unless '-M' option is specified When creating small Btrfs filesystem instances (i.e. filesystem size <= 1GiB), mkfs.btrfs fails if both sectorsize and nodesize are specified on the command line and sectorsize != nodesize, since mixed block groups involves both data and metadata blocks sharing the same block group. This is an incorrect behavior when '-M' option isn't specified on the command line. This commit makes optional the creation of mixed block groups i.e. Mixed block groups are created only when -M option is specified on the command line. Since we now allow small filesystem instances with sectorsize != nodesize to be created, we can end up in the following situation, [root@localhost ~]# mkfs.btrfs -f -n 65536 /dev/loop0 btrfs-progs v3.19-rc2-405-g976307c See http://btrfs.wiki.kernel.org for more information. Performing full device TRIM (512.00MiB) ... Label: (null) UUID: 49fab72e-0c8b-466b-a3ca-d1bfe56475f0 Node size: 65536 Sector size: 4096 Filesystem size: 512.00MiB Block group profiles: Data: single 8.00MiB Metadata: DUP 40.00MiB System: DUP 12.00MiB SSD detected: no Incompat features: extref, skinny-metadata Number of devices: 1 Devices: ID SIZE PATH 1 512.00MiB /dev/loop0 [root@localhost ~]# mount /dev/loop0 /mnt/ mount: mount /dev/loop0 on /mnt failed: No space left on device The ENOSPC occurs during the creation of the UUID tree. This is because of things like large metadata block size, DUP mode used for metadata and global reservation consuming space. Also, large nodesize does not make sense on small filesystems, hence this should not be an issue. Signed-off-by: Chandan Rajendra <chandan@linux.vnet.ibm.com> Signed-off-by: David Sterba <dsterba@suse.com>
2015-10-14 17:39:37 +00:00
0, discard);
close(devfd);
if (res) {
ret++;
goto error_out;
}
path = canonicalize_path(argv[i]);
if (!path) {
error("could not canonicalize pathname '%s': %s",
argv[i], strerror(errno));
ret++;
goto error_out;
}
memset(&ioctl_args, 0, sizeof(ioctl_args));
strncpy_null(ioctl_args.name, path);
res = ioctl(fdmnt, BTRFS_IOC_ADD_DEV, &ioctl_args);
e = errno;
if (res < 0) {
error("error adding device '%s': %s",
path, strerror(e));
ret++;
}
free(path);
}
error_out:
close_file_or_dir(fdmnt, dirstream);
return !!ret;
}
static int _cmd_device_remove(int argc, char **argv,
const char * const *usagestr)
{
char *mntpnt;
int i, fdmnt, ret=0, e;
DIR *dirstream = NULL;
if (check_argc_min(argc, 3))
usage(usagestr);
mntpnt = argv[argc - 1];
fdmnt = btrfs_open_dir(mntpnt, &dirstream, 1);
if (fdmnt < 0)
return 1;
for(i=1 ; i < argc - 1; i++ ){
struct btrfs_ioctl_vol_args arg;
int res;
if (is_block_device(argv[i]) != 1 && strcmp(argv[i], "missing")) {
error("not a block device: %s", argv[i]);
ret++;
continue;
}
memset(&arg, 0, sizeof(arg));
strncpy_null(arg.name, argv[i]);
res = ioctl(fdmnt, BTRFS_IOC_RM_DEV, &arg);
e = errno;
if (res) {
const char *msg;
if (res > 0)
msg = btrfs_err_str(res);
else
msg = strerror(e);
error("error removing device '%s': %s",
argv[i], msg);
ret++;
}
}
close_file_or_dir(fdmnt, dirstream);
return !!ret;
}
static const char * const cmd_device_remove_usage[] = {
"btrfs device remove <device> [<device>...] <path>",
"Remove a device from a filesystem",
NULL
};
static int cmd_device_remove(int argc, char **argv)
{
return _cmd_device_remove(argc, argv, cmd_device_remove_usage);
}
static const char * const cmd_device_delete_usage[] = {
"btrfs device delete <device> [<device>...] <path>",
"Remove a device from a filesystem",
NULL
};
static int cmd_device_delete(int argc, char **argv)
{
return _cmd_device_remove(argc, argv, cmd_device_delete_usage);
}
static const char * const cmd_device_scan_usage[] = {
"btrfs device scan [(-d|--all-devices)|<device> [<device>...]]",
"Scan devices for a btrfs filesystem",
" -d|--all-devices (deprecated)",
NULL
};
static int cmd_device_scan(int argc, char **argv)
{
int i;
int devstart = 1;
int all = 0;
int ret = 0;
optind = 1;
while (1) {
int c;
static const struct option long_options[] = {
{ "all-devices", no_argument, NULL, 'd'},
{ NULL, 0, NULL, 0}
};
c = getopt_long(argc, argv, "d", long_options, NULL);
if (c < 0)
break;
switch (c) {
case 'd':
all = 1;
break;
default:
usage(cmd_device_scan_usage);
}
}
if (all && check_argc_max(argc, 2))
usage(cmd_device_scan_usage);
if (all || argc == 1) {
printf("Scanning for Btrfs filesystems\n");
ret = btrfs_scan_lblkid();
error_on(ret, "error %d while scanning", ret);
ret = btrfs_register_all_devices();
error_on(ret, "error %d while registering devices", ret);
goto out;
}
for( i = devstart ; i < argc ; i++ ){
char *path;
if (is_block_device(argv[i]) != 1) {
error("not a block device: %s", argv[i]);
ret = 1;
goto out;
}
path = canonicalize_path(argv[i]);
if (!path) {
error("could not canonicalize path '%s': %s",
argv[i], strerror(errno));
ret = 1;
goto out;
}
printf("Scanning for Btrfs filesystems in '%s'\n", path);
if (btrfs_register_one_device(path) != 0) {
ret = 1;
free(path);
goto out;
}
free(path);
}
out:
return !!ret;
}
static const char * const cmd_device_ready_usage[] = {
"btrfs device ready <device>",
"Check device to see if it has all of its devices in cache for mounting",
NULL
};
static int cmd_device_ready(int argc, char **argv)
{
struct btrfs_ioctl_vol_args args;
int fd;
int ret;
char *path;
if (check_argc_min(argc, 2))
usage(cmd_device_ready_usage);
fd = open("/dev/btrfs-control", O_RDWR);
if (fd < 0) {
perror("failed to open /dev/btrfs-control");
return 1;
}
path = canonicalize_path(argv[argc - 1]);
if (!path) {
error("could not canonicalize pathname '%s': %s",
argv[argc - 1], strerror(errno));
ret = 1;
goto out;
}
if (is_block_device(path) != 1) {
error("not a block device: %s", path);
ret = 1;
goto out;
}
memset(&args, 0, sizeof(args));
strncpy_null(args.name, path);
ret = ioctl(fd, BTRFS_IOC_DEVICES_READY, &args);
if (ret < 0) {
error("unable to determine if device '%s' is ready for mount: %s",
path, strerror(errno));
ret = 1;
}
out:
free(path);
close(fd);
return ret;
}
static const char * const cmd_device_stats_usage[] = {
"btrfs device stats [-z] <path>|<device>",
"Show current device IO stats.",
"",
"-z show current stats and reset values to zero",
NULL
};
static int cmd_device_stats(int argc, char **argv)
{
char *dev_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:
usage(cmd_device_stats_usage);
}
}
argc = argc - optind;
if (check_argc_exact(argc, 1))
usage(cmd_device_stats_usage);
dev_path = argv[optind];
fdmnt = open_path_or_dev_mnt(dev_path, &dirstream, 1);
if (fdmnt < 0)
return 1;
ret = get_fs_info(dev_path, &fi_args, &di_args);
if (ret) {
error("getting dev info for devstats failed: %s",
strerror(-ret));
err = 1;
goto out;
}
if (!fi_args.num_devices) {
error("no devices found");
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) {
error("DEV_STATS ioctl failed on %s: %s",
path, strerror(errno));
err = 1;
} else {
char *canonical_path;
canonical_path = canonicalize_path((char *)path);
if (args.nr_items >= BTRFS_DEV_STAT_WRITE_ERRS + 1)
printf("[%s].write_io_errs %llu\n",
canonical_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",
canonical_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",
canonical_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",
canonical_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",
canonical_path,
(unsigned long long) args.values[
BTRFS_DEV_STAT_GENERATION_ERRS]);
free(canonical_path);
}
}
out:
free(di_args);
close_file_or_dir(fdmnt, dirstream);
return err;
}
static const char * const cmd_device_usage_usage[] = {
"btrfs device usage [options] <path> [<path>..]",
"Show detailed information about internal allocations in devices.",
HELPINFO_UNITS_SHORT_LONG,
NULL
};
static int _cmd_device_usage(int fd, char *path, unsigned unit_mode)
{
int i;
int ret = 0;
struct chunk_info *chunkinfo = NULL;
struct device_info *devinfo = NULL;
int chunkcount = 0;
int devcount = 0;
ret = load_chunk_and_device_info(fd, &chunkinfo, &chunkcount, &devinfo,
&devcount);
if (ret)
goto out;
for (i = 0; i < devcount; i++) {
printf("%s, ID: %llu\n", devinfo[i].path, devinfo[i].devid);
print_device_sizes(fd, &devinfo[i], unit_mode);
print_device_chunks(fd, &devinfo[i], chunkinfo, chunkcount,
unit_mode);
printf("\n");
}
out:
free(devinfo);
free(chunkinfo);
return ret;
}
static int cmd_device_usage(int argc, char **argv)
{
unsigned unit_mode;
int ret = 0;
int i;
unit_mode = get_unit_mode_from_arg(&argc, argv, 1);
if (check_argc_min(argc, 2) || argv[1][0] == '-')
usage(cmd_device_usage_usage);
for (i = 1; i < argc; i++) {
int fd;
DIR *dirstream = NULL;
if (i > 1)
printf("\n");
fd = btrfs_open_dir(argv[i], &dirstream, 1);
if (fd < 0) {
ret = 1;
break;
}
ret = _cmd_device_usage(fd, argv[i], unit_mode);
close_file_or_dir(fd, dirstream);
if (ret)
break;
}
return !!ret;
}
static const char device_cmd_group_info[] =
"manage and query devices in the filesystem";
const struct cmd_group device_cmd_group = {
device_cmd_group_usage, device_cmd_group_info, {
{ "add", cmd_device_add, cmd_device_add_usage, NULL, 0 },
{ "delete", cmd_device_delete, cmd_device_delete_usage, NULL,
CMD_ALIAS },
{ "remove", cmd_device_remove, cmd_device_remove_usage, NULL, 0 },
{ "scan", cmd_device_scan, cmd_device_scan_usage, NULL, 0 },
{ "ready", cmd_device_ready, cmd_device_ready_usage, NULL, 0 },
{ "stats", cmd_device_stats, cmd_device_stats_usage, NULL, 0 },
{ "usage", cmd_device_usage,
cmd_device_usage_usage, NULL, 0 },
NULL_CMD_STRUCT
}
};
int cmd_device(int argc, char **argv)
{
return handle_command_group(&device_cmd_group, argc, argv);
}