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btrfs-progs/cmds-filesystem.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.
*/
#define _XOPEN_SOURCE 500
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <uuid/uuid.h>
#include <ctype.h>
#include <fcntl.h>
#include <ftw.h>
#include <mntent.h>
#include <linux/limits.h>
#include <getopt.h>
#include "kerncompat.h"
#include "ctree.h"
#include "ioctl.h"
#include "utils.h"
#include "volumes.h"
#include "version.h"
#include "commands.h"
#include "list_sort.h"
#include "disk-io.h"
/*
* for btrfs fi show, we maintain a hash of fsids we've already printed.
* This way we don't print dups if a given FS is mounted more than once.
*/
#define SEEN_FSID_HASH_SIZE 256
struct seen_fsid {
u8 fsid[BTRFS_FSID_SIZE];
struct seen_fsid *next;
};
static struct seen_fsid *seen_fsid_hash[SEEN_FSID_HASH_SIZE] = {NULL,};
static int add_seen_fsid(u8 *fsid)
{
u8 hash = fsid[0];
int slot = hash % SEEN_FSID_HASH_SIZE;
struct seen_fsid *seen = seen_fsid_hash[slot];
struct seen_fsid *alloc;
if (!seen)
goto insert;
while (1) {
if (memcmp(seen->fsid, fsid, BTRFS_FSID_SIZE) == 0)
return -EEXIST;
if (!seen->next)
break;
seen = seen->next;
}
insert:
alloc = malloc(sizeof(*alloc));
if (!alloc)
return -ENOMEM;
alloc->next = NULL;
memcpy(alloc->fsid, fsid, BTRFS_FSID_SIZE);
if (seen)
seen->next = alloc;
else
seen_fsid_hash[slot] = alloc;
return 0;
}
static void free_seen_fsid(void)
{
int slot;
struct seen_fsid *seen;
struct seen_fsid *next;
for (slot = 0; slot < SEEN_FSID_HASH_SIZE; slot++) {
seen = seen_fsid_hash[slot];
while (seen) {
next = seen->next;
free(seen);
seen = next;
}
seen_fsid_hash[slot] = NULL;
}
}
static const char * const filesystem_cmd_group_usage[] = {
"btrfs filesystem [<group>] <command> [<args>]",
NULL
};
static const char * const cmd_df_usage[] = {
"btrfs filesystem df <path>",
"Show space usage information for a mount point",
NULL
};
static char *group_type_str(u64 flag)
{
switch (flag & BTRFS_BLOCK_GROUP_TYPE_MASK) {
case BTRFS_BLOCK_GROUP_DATA:
return "Data";
case BTRFS_BLOCK_GROUP_SYSTEM:
return "System";
case BTRFS_BLOCK_GROUP_METADATA:
return "Metadata";
case BTRFS_BLOCK_GROUP_DATA|BTRFS_BLOCK_GROUP_METADATA:
return "Data+Metadata";
default:
return "unknown";
}
}
static char *group_profile_str(u64 flag)
{
switch (flag & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
case 0:
return "single";
case BTRFS_BLOCK_GROUP_RAID0:
return "RAID0";
case BTRFS_BLOCK_GROUP_RAID1:
return "RAID1";
case BTRFS_BLOCK_GROUP_RAID5:
return "RAID5";
case BTRFS_BLOCK_GROUP_RAID6:
return "RAID6";
case BTRFS_BLOCK_GROUP_DUP:
return "DUP";
case BTRFS_BLOCK_GROUP_RAID10:
return "RAID10";
default:
return "unknown";
}
}
static int get_df(int fd, struct btrfs_ioctl_space_args **sargs_ret)
{
u64 count = 0;
int ret, e;
struct btrfs_ioctl_space_args *sargs;
sargs = malloc(sizeof(struct btrfs_ioctl_space_args));
if (!sargs)
return -ENOMEM;
sargs->space_slots = 0;
sargs->total_spaces = 0;
ret = ioctl(fd, BTRFS_IOC_SPACE_INFO, sargs);
e = errno;
if (ret) {
fprintf(stderr, "ERROR: couldn't get space info - %s\n",
strerror(e));
free(sargs);
return -e;
}
/* This really should never happen */
if (!sargs->total_spaces) {
free(sargs);
return -ENOENT;
}
count = sargs->total_spaces;
free(sargs);
sargs = malloc(sizeof(struct btrfs_ioctl_space_args) +
(count * sizeof(struct btrfs_ioctl_space_info)));
if (!sargs)
ret = -ENOMEM;
sargs->space_slots = count;
sargs->total_spaces = 0;
ret = ioctl(fd, BTRFS_IOC_SPACE_INFO, sargs);
e = errno;
if (ret) {
fprintf(stderr, "ERROR: get space info count %llu - %s\n",
count, strerror(e));
free(sargs);
return -e;
}
*sargs_ret = sargs;
return 0;
}
static void print_df(struct btrfs_ioctl_space_args *sargs)
{
u64 i;
struct btrfs_ioctl_space_info *sp = sargs->spaces;
for (i = 0; i < sargs->total_spaces; i++, sp++) {
printf("%s, %s: total=%s, used=%s\n",
group_type_str(sp->flags),
group_profile_str(sp->flags),
pretty_size(sp->total_bytes),
pretty_size(sp->used_bytes));
}
}
static int cmd_df(int argc, char **argv)
{
struct btrfs_ioctl_space_args *sargs = NULL;
int ret;
int fd;
char *path;
DIR *dirstream = NULL;
if (check_argc_exact(argc, 2))
usage(cmd_df_usage);
path = argv[1];
fd = open_file_or_dir(path, &dirstream);
if (fd < 0) {
fprintf(stderr, "ERROR: can't access '%s'\n", path);
return 1;
}
ret = get_df(fd, &sargs);
if (!ret && sargs) {
print_df(sargs);
free(sargs);
} else {
fprintf(stderr, "ERROR: get_df failed %s\n", strerror(-ret));
}
close_file_or_dir(fd, dirstream);
return !!ret;
}
static int match_search_item_kernel(__u8 *fsid, char *mnt, char *label,
char *search)
{
char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
int search_len = strlen(search);
search_len = min(search_len, BTRFS_UUID_UNPARSED_SIZE);
uuid_unparse(fsid, uuidbuf);
if (!strncmp(uuidbuf, search, search_len))
return 1;
if (strlen(label) && strcmp(label, search) == 0)
return 1;
if (strcmp(mnt, search) == 0)
return 1;
return 0;
}
static int uuid_search(struct btrfs_fs_devices *fs_devices, char *search)
{
char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
struct list_head *cur;
struct btrfs_device *device;
int search_len = strlen(search);
search_len = min(search_len, BTRFS_UUID_UNPARSED_SIZE);
uuid_unparse(fs_devices->fsid, uuidbuf);
if (!strncmp(uuidbuf, search, search_len))
return 1;
list_for_each(cur, &fs_devices->devices) {
device = list_entry(cur, struct btrfs_device, dev_list);
if ((device->label && strcmp(device->label, search) == 0) ||
strcmp(device->name, search) == 0)
return 1;
}
return 0;
}
/*
* Sort devices by devid, ascending
*/
static int cmp_device_id(void *priv, struct list_head *a,
struct list_head *b)
{
const struct btrfs_device *da = list_entry(a, struct btrfs_device,
dev_list);
const struct btrfs_device *db = list_entry(b, struct btrfs_device,
dev_list);
return da->devid < db->devid ? -1 :
da->devid > db->devid ? 1 : 0;
}
static void print_one_uuid(struct btrfs_fs_devices *fs_devices)
{
char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
struct list_head *cur;
struct btrfs_device *device;
u64 devs_found = 0;
u64 total;
if (add_seen_fsid(fs_devices->fsid))
return;
uuid_unparse(fs_devices->fsid, uuidbuf);
device = list_entry(fs_devices->devices.next, struct btrfs_device,
dev_list);
if (device->label && device->label[0])
printf("Label: '%s' ", device->label);
else
printf("Label: none ");
total = device->total_devs;
printf(" uuid: %s\n\tTotal devices %llu FS bytes used %s\n", uuidbuf,
(unsigned long long)total,
pretty_size(device->super_bytes_used));
list_sort(NULL, &fs_devices->devices, cmp_device_id);
list_for_each(cur, &fs_devices->devices) {
device = list_entry(cur, struct btrfs_device, dev_list);
printf("\tdevid %4llu size %s used %s path %s\n",
(unsigned long long)device->devid,
pretty_size(device->total_bytes),
pretty_size(device->bytes_used), device->name);
devs_found++;
}
if (devs_found < total) {
printf("\t*** Some devices missing\n");
}
printf("\n");
}
/* adds up all the used spaces as reported by the space info ioctl
*/
static u64 calc_used_bytes(struct btrfs_ioctl_space_args *si)
{
u64 ret = 0;
int i;
for (i = 0; i < si->total_spaces; i++)
ret += si->spaces[i].used_bytes;
return ret;
}
static int print_one_fs(struct btrfs_ioctl_fs_info_args *fs_info,
struct btrfs_ioctl_dev_info_args *dev_info,
struct btrfs_ioctl_space_args *space_info,
char *label, char *path)
{
int i;
int fd;
int missing = 0;
char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
struct btrfs_ioctl_dev_info_args *tmp_dev_info;
int ret;
ret = add_seen_fsid(fs_info->fsid);
if (ret == -EEXIST)
return 0;
else if (ret)
return ret;
uuid_unparse(fs_info->fsid, uuidbuf);
if (label && strlen(label))
printf("Label: '%s' ", label);
else
printf("Label: none ");
printf(" uuid: %s\n\tTotal devices %llu FS bytes used %s\n", uuidbuf,
fs_info->num_devices,
pretty_size(calc_used_bytes(space_info)));
for (i = 0; i < fs_info->num_devices; i++) {
tmp_dev_info = (struct btrfs_ioctl_dev_info_args *)&dev_info[i];
/* Add check for missing devices even mounted */
fd = open((char *)tmp_dev_info->path, O_RDONLY);
if (fd < 0) {
missing = 1;
continue;
}
close(fd);
printf("\tdevid %4llu size %s used %s path %s\n",
tmp_dev_info->devid,
pretty_size(tmp_dev_info->total_bytes),
pretty_size(tmp_dev_info->bytes_used),
tmp_dev_info->path);
}
if (missing)
printf("\t*** Some devices missing\n");
printf("\n");
return 0;
}
/* This function checks if the given input parameter is
* an uuid or a path
* return -1: some error in the given input
* return 0: unknow input
* return 1: given input is uuid
* return 2: given input is path
*/
static int check_arg_type(char *input)
{
uuid_t out;
char path[PATH_MAX];
if (!input)
return -EINVAL;
if (realpath(input, path)) {
if (is_block_device(path) == 1)
return BTRFS_ARG_BLKDEV;
if (is_mount_point(path) == 1)
return BTRFS_ARG_MNTPOINT;
return BTRFS_ARG_UNKNOWN;
}
if (strlen(input) == (BTRFS_UUID_UNPARSED_SIZE - 1) &&
!uuid_parse(input, out))
return BTRFS_ARG_UUID;
return BTRFS_ARG_UNKNOWN;
}
static int btrfs_scan_kernel(void *search)
{
int ret = 0, fd;
FILE *f;
struct mntent *mnt;
struct btrfs_ioctl_fs_info_args fs_info_arg;
struct btrfs_ioctl_dev_info_args *dev_info_arg = NULL;
struct btrfs_ioctl_space_args *space_info_arg;
char label[BTRFS_LABEL_SIZE];
f = setmntent("/proc/self/mounts", "r");
if (f == NULL)
return 1;
memset(label, 0, sizeof(label));
while ((mnt = getmntent(f)) != NULL) {
if (strcmp(mnt->mnt_type, "btrfs"))
continue;
ret = get_fs_info(mnt->mnt_dir, &fs_info_arg,
&dev_info_arg);
if (ret)
goto out;
if (get_label_mounted(mnt->mnt_dir, label)) {
kfree(dev_info_arg);
ret = 1;
goto out;
}
if (search && !match_search_item_kernel(fs_info_arg.fsid,
mnt->mnt_dir, label, search)) {
kfree(dev_info_arg);
continue;
}
fd = open(mnt->mnt_dir, O_RDONLY);
if ((fd != -1) && !get_df(fd, &space_info_arg)) {
print_one_fs(&fs_info_arg, dev_info_arg,
space_info_arg, label, mnt->mnt_dir);
kfree(space_info_arg);
memset(label, 0, sizeof(label));
}
if (fd != -1)
close(fd);
kfree(dev_info_arg);
if (search)
ret = 0;
}
if (search)
ret = 1;
out:
endmntent(f);
return ret;
}
static int dev_to_fsid(char *dev, __u8 *fsid)
{
struct btrfs_super_block *disk_super;
char *buf;
int ret;
int fd;
buf = malloc(4096);
if (!buf)
return -ENOMEM;
fd = open(dev, O_RDONLY);
if (fd < 0) {
ret = -errno;
free(buf);
return ret;
}
disk_super = (struct btrfs_super_block *)buf;
ret = btrfs_read_dev_super(fd, disk_super,
BTRFS_SUPER_INFO_OFFSET);
if (ret)
goto out;
memcpy(fsid, disk_super->fsid, BTRFS_FSID_SIZE);
ret = 0;
out:
close(fd);
free(buf);
return ret;
}
static const char * const cmd_show_usage[] = {
"btrfs filesystem show [options] [<path>|<uuid>|<device>|label]",
"Show the structure of a filesystem",
"-d|--all-devices show only disks under /dev containing btrfs filesystem",
"-m|--mounted show only mounted btrfs",
"If no argument is given, structure of all present filesystems is shown.",
NULL
};
static int cmd_show(int argc, char **argv)
{
struct list_head *all_uuids;
struct btrfs_fs_devices *fs_devices;
struct list_head *cur_uuid;
char *search = NULL;
int ret;
int where = BTRFS_SCAN_LBLKID;
int type = 0;
char mp[BTRFS_PATH_NAME_MAX + 1];
char path[PATH_MAX];
__u8 fsid[BTRFS_FSID_SIZE];
char uuid_buf[37];
int found = 0;
while (1) {
int long_index;
static struct option long_options[] = {
{ "all-devices", no_argument, NULL, 'd'},
{ "mounted", no_argument, NULL, 'm'},
{ NULL, no_argument, NULL, 0 },
};
int c = getopt_long(argc, argv, "dm", long_options,
&long_index);
if (c < 0)
break;
switch (c) {
case 'd':
where = BTRFS_SCAN_DEV;
break;
case 'm':
where = BTRFS_SCAN_MOUNTED;
break;
default:
usage(cmd_show_usage);
}
}
if (check_argc_max(argc, optind + 1))
usage(cmd_show_usage);
if (argc > optind) {
search = argv[optind];
if (strlen(search) == 0)
usage(cmd_show_usage);
type = check_arg_type(search);
/*
* needs spl handling if input arg is block dev
* And if input arg is mount-point just print it
* right away
*/
if (type == BTRFS_ARG_BLKDEV) {
if (where == BTRFS_SCAN_DEV) {
/* we need to do this because
* legacy BTRFS_SCAN_DEV
* provides /dev/dm-x paths
*/
if (realpath(search, path))
search = path;
} else {
ret = get_btrfs_mount(search,
mp, sizeof(mp));
if (!ret) {
/* given block dev is mounted*/
search = mp;
type = BTRFS_ARG_MNTPOINT;
} else {
ret = dev_to_fsid(search, fsid);
if (ret) {
fprintf(stderr,
"ERROR: No btrfs on %s\n",
search);
return 1;
}
uuid_unparse(fsid, uuid_buf);
search = uuid_buf;
type = BTRFS_ARG_UUID;
goto devs_only;
}
}
}
}
if (where == BTRFS_SCAN_DEV)
goto devs_only;
/* show mounted btrfs */
ret = btrfs_scan_kernel(search);
if (search && !ret) {
/* since search is found we are done */
goto out;
}
/* shows mounted only */
if (where == BTRFS_SCAN_MOUNTED)
goto out;
devs_only:
ret = scan_for_btrfs(where, !BTRFS_UPDATE_KERNEL);
if (ret) {
fprintf(stderr, "ERROR: %d while scanning\n", ret);
return 1;
}
all_uuids = btrfs_scanned_uuids();
list_for_each(cur_uuid, all_uuids) {
fs_devices = list_entry(cur_uuid, struct btrfs_fs_devices,
list);
if (search && uuid_search(fs_devices, search) == 0)
continue;
print_one_uuid(fs_devices);
found = 1;
}
if (search && !found)
ret = 1;
out:
printf("%s\n", BTRFS_BUILD_VERSION);
free_seen_fsid();
return ret;
}
static const char * const cmd_sync_usage[] = {
"btrfs filesystem sync <path>",
"Force a sync on a filesystem",
NULL
};
static int cmd_sync(int argc, char **argv)
{
int fd, res, e;
char *path;
DIR *dirstream = NULL;
if (check_argc_exact(argc, 2))
usage(cmd_sync_usage);
path = argv[1];
fd = open_file_or_dir(path, &dirstream);
if (fd < 0) {
fprintf(stderr, "ERROR: can't access '%s'\n", path);
return 1;
}
printf("FSSync '%s'\n", path);
res = ioctl(fd, BTRFS_IOC_SYNC);
e = errno;
close_file_or_dir(fd, dirstream);
if( res < 0 ){
fprintf(stderr, "ERROR: unable to fs-syncing '%s' - %s\n",
path, strerror(e));
return 1;
}
return 0;
}
static int parse_compress_type(char *s)
{
if (strcmp(optarg, "zlib") == 0)
return BTRFS_COMPRESS_ZLIB;
else if (strcmp(optarg, "lzo") == 0)
return BTRFS_COMPRESS_LZO;
else {
fprintf(stderr, "Unknown compress type %s\n", s);
exit(1);
};
}
static const char * const cmd_defrag_usage[] = {
"btrfs filesystem defragment [options] <file>|<dir> [<file>|<dir>...]",
"Defragment a file or a directory",
"",
"-v be verbose",
"-r defragment files recursively",
"-c[zlib,lzo] compress the file while defragmenting",
"-f flush data to disk immediately after defragmenting",
"-s start defragment only from byte onward",
"-l len defragment only up to len bytes",
"-t size minimal size of file to be considered for defragmenting",
NULL
};
static int do_defrag(int fd, int fancy_ioctl,
struct btrfs_ioctl_defrag_range_args *range)
{
int ret;
if (!fancy_ioctl)
ret = ioctl(fd, BTRFS_IOC_DEFRAG, NULL);
else
ret = ioctl(fd, BTRFS_IOC_DEFRAG_RANGE, range);
return ret;
}
static int defrag_global_fancy_ioctl;
static struct btrfs_ioctl_defrag_range_args defrag_global_range;
static int defrag_global_verbose;
static int defrag_global_errors;
static int defrag_callback(const char *fpath, const struct stat *sb,
int typeflag, struct FTW *ftwbuf)
{
int ret = 0;
int e = 0;
int fd = 0;
if ((typeflag == FTW_F) && S_ISREG(sb->st_mode)) {
if (defrag_global_verbose)
printf("%s\n", fpath);
fd = open(fpath, O_RDWR);
e = errno;
if (fd < 0)
goto error;
ret = do_defrag(fd, defrag_global_fancy_ioctl, &defrag_global_range);
e = errno;
close(fd);
if (ret && e == ENOTTY && defrag_global_fancy_ioctl) {
fprintf(stderr, "ERROR: defrag range ioctl not "
"supported in this kernel, please try "
"without any options.\n");
defrag_global_errors++;
return ENOTTY;
}
if (ret)
goto error;
}
return 0;
error:
fprintf(stderr, "ERROR: defrag failed on %s - %s\n", fpath, strerror(e));
defrag_global_errors++;
return 0;
}
static int cmd_defrag(int argc, char **argv)
{
int fd;
int flush = 0;
u64 start = 0;
u64 len = (u64)-1;
u32 thresh = 0;
int i;
int recursive = 0;
int ret = 0;
struct btrfs_ioctl_defrag_range_args range;
int e = 0;
int compress_type = BTRFS_COMPRESS_NONE;
DIR *dirstream;
defrag_global_errors = 0;
defrag_global_verbose = 0;
defrag_global_errors = 0;
defrag_global_fancy_ioctl = 0;
optind = 1;
while(1) {
int c = getopt(argc, argv, "vrc::fs:l:t:");
if (c < 0)
break;
switch(c) {
case 'c':
compress_type = BTRFS_COMPRESS_ZLIB;
if (optarg)
compress_type = parse_compress_type(optarg);
defrag_global_fancy_ioctl = 1;
break;
case 'f':
flush = 1;
defrag_global_fancy_ioctl = 1;
break;
case 'v':
defrag_global_verbose = 1;
break;
case 's':
start = parse_size(optarg);
defrag_global_fancy_ioctl = 1;
break;
case 'l':
len = parse_size(optarg);
defrag_global_fancy_ioctl = 1;
break;
case 't':
thresh = parse_size(optarg);
defrag_global_fancy_ioctl = 1;
break;
case 'r':
recursive = 1;
break;
default:
usage(cmd_defrag_usage);
}
}
if (check_argc_min(argc - optind, 1))
usage(cmd_defrag_usage);
memset(&defrag_global_range, 0, sizeof(range));
defrag_global_range.start = start;
defrag_global_range.len = len;
defrag_global_range.extent_thresh = thresh;
if (compress_type) {
defrag_global_range.flags |= BTRFS_DEFRAG_RANGE_COMPRESS;
defrag_global_range.compress_type = compress_type;
}
if (flush)
defrag_global_range.flags |= BTRFS_DEFRAG_RANGE_START_IO;
for (i = optind; i < argc; i++) {
struct stat st;
dirstream = NULL;
fd = open_file_or_dir(argv[i], &dirstream);
if (fd < 0) {
fprintf(stderr, "ERROR: failed to open %s - %s\n", argv[i],
strerror(errno));
defrag_global_errors++;
close_file_or_dir(fd, dirstream);
continue;
}
if (fstat(fd, &st)) {
fprintf(stderr, "ERROR: failed to stat %s - %s\n",
argv[i], strerror(errno));
defrag_global_errors++;
close_file_or_dir(fd, dirstream);
continue;
}
if (!(S_ISDIR(st.st_mode) || S_ISREG(st.st_mode))) {
fprintf(stderr,
"ERROR: %s is not a directory or a regular file\n",
argv[i]);
defrag_global_errors++;
close_file_or_dir(fd, dirstream);
continue;
}
if (recursive) {
if (S_ISDIR(st.st_mode)) {
ret = nftw(argv[i], defrag_callback, 10,
FTW_MOUNT | FTW_PHYS);
if (ret == ENOTTY)
exit(1);
/* errors are handled in the callback */
ret = 0;
} else {
if (defrag_global_verbose)
printf("%s\n", argv[i]);
ret = do_defrag(fd, defrag_global_fancy_ioctl,
&defrag_global_range);
e = errno;
}
} else {
if (defrag_global_verbose)
printf("%s\n", argv[i]);
ret = do_defrag(fd, defrag_global_fancy_ioctl,
&defrag_global_range);
e = errno;
}
close_file_or_dir(fd, dirstream);
if (ret && e == ENOTTY && defrag_global_fancy_ioctl) {
fprintf(stderr, "ERROR: defrag range ioctl not "
"supported in this kernel, please try "
"without any options.\n");
defrag_global_errors++;
break;
}
if (ret) {
fprintf(stderr, "ERROR: defrag failed on %s - %s\n",
argv[i], strerror(e));
defrag_global_errors++;
}
}
if (defrag_global_verbose)
printf("%s\n", BTRFS_BUILD_VERSION);
if (defrag_global_errors)
fprintf(stderr, "total %d failures\n", defrag_global_errors);
return !!defrag_global_errors;
}
static const char * const cmd_resize_usage[] = {
"btrfs filesystem resize [devid:][+/-]<newsize>[gkm]|[devid:]max <path>",
"Resize a filesystem",
"If 'max' is passed, the filesystem will occupy all available space",
"on the device 'devid'.",
NULL
};
static int cmd_resize(int argc, char **argv)
{
struct btrfs_ioctl_vol_args args;
int fd, res, len, e;
char *amount, *path;
DIR *dirstream = NULL;
if (check_argc_exact(argc, 3))
usage(cmd_resize_usage);
amount = argv[1];
path = argv[2];
len = strlen(amount);
if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
fprintf(stderr, "ERROR: size value too long ('%s)\n",
amount);
return 1;
}
fd = open_file_or_dir(path, &dirstream);
if (fd < 0) {
fprintf(stderr, "ERROR: can't access '%s'\n", path);
return 1;
}
printf("Resize '%s' of '%s'\n", path, amount);
strncpy_null(args.name, amount);
res = ioctl(fd, BTRFS_IOC_RESIZE, &args);
e = errno;
close_file_or_dir(fd, dirstream);
if( res < 0 ){
fprintf(stderr, "ERROR: unable to resize '%s' - %s\n",
path, strerror(e));
return 1;
}
return 0;
}
static const char * const cmd_label_usage[] = {
"btrfs filesystem label [<device>|<mount_point>] [<newlabel>]",
"Get or change the label of a filesystem",
"With one argument, get the label of filesystem on <device>.",
"If <newlabel> is passed, set the filesystem label to <newlabel>.",
NULL
};
static int cmd_label(int argc, char **argv)
{
if (check_argc_min(argc, 2) || check_argc_max(argc, 3))
usage(cmd_label_usage);
if (argc > 2) {
return set_label(argv[1], argv[2]);
} else {
char label[BTRFS_LABEL_SIZE];
int ret;
ret = get_label(argv[1], label);
if (!ret)
fprintf(stdout, "%s\n", label);
return ret;
}
}
const struct cmd_group filesystem_cmd_group = {
filesystem_cmd_group_usage, NULL, {
{ "df", cmd_df, cmd_df_usage, NULL, 0 },
{ "show", cmd_show, cmd_show_usage, NULL, 0 },
{ "sync", cmd_sync, cmd_sync_usage, NULL, 0 },
{ "defragment", cmd_defrag, cmd_defrag_usage, NULL, 0 },
{ "balance", cmd_balance, NULL, &balance_cmd_group, 1 },
{ "resize", cmd_resize, cmd_resize_usage, NULL, 0 },
{ "label", cmd_label, cmd_label_usage, NULL, 0 },
NULL_CMD_STRUCT
}
};
int cmd_filesystem(int argc, char **argv)
{
return handle_command_group(&filesystem_cmd_group, argc, argv);
}
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