/*
* 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 "kerncompat.h"
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <linux/version.h>
#include <linux/fs.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <ftw.h>
#include <mntent.h>
#include <getopt.h>
#include <limits.h>
#include <dirent.h>
#include <stdbool.h>
#include <ctype.h>
#include <uuid/uuid.h>
#include "libbtrfsutil/btrfsutil.h"
#include "kernel-lib/list.h"
#include "kernel-lib/sizes.h"
#include "kernel-lib/list_sort.h"
#include "kernel-lib/overflow.h"
#include "kernel-shared/ctree.h"
#include "kernel-shared/compression.h"
#include "kernel-shared/volumes.h"
#include "kernel-shared/disk-io.h"
#include "common/defs.h"
#include "common/internal.h"
#include "common/messages.h"
#include "common/utils.h"
#include "common/help.h"
#include "common/units.h"
#include "common/fsfeatures.h"
#include "common/path-utils.h"
#include "common/device-scan.h"
#include "common/device-utils.h"
#include "common/open-utils.h"
#include "common/parse-utils.h"
#include "common/sysfs-utils.h"
#include "common/string-utils.h"
#include "common/filesystem-utils.h"
#include "common/format-output.h"
#include "cmds/commands.h"
#include "cmds/filesystem-usage.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.
*/
static struct seen_fsid *seen_fsid_hash[SEEN_FSID_HASH_SIZE] = {NULL,};
static mode_t defrag_open_mode = O_RDONLY;
static const char * const filesystem_cmd_group_usage[] = {
"btrfs filesystem [<group>] <command> [<args>]",
NULL
};
static const char * const cmd_filesystem_df_usage[] = {
"btrfs filesystem df [options] <path>",
"Show space usage information for a mount point",
"",
HELPINFO_UNITS_SHORT_LONG,
HELPINFO_INSERT_GLOBALS,
HELPINFO_INSERT_FORMAT,
NULL
};
static void print_df_by_type(int fd, unsigned int unit_mode) {
static const char *files[] = {
"bg_reclaim_threshold",
"bytes_may_use",
"bytes_pinned",
"bytes_readonly",
"bytes_reserved",
"bytes_used",
"bytes_zone_unusable",
"chunk_size",
"disk_total",
"disk_used",
"total_bytes",
};
char path[PATH_MAX] = { 0 };
const char *types[] = { "data", "metadata", "mixed", "system" };
u64 tmp;
int ret;
for (int ti = 0; ti < ARRAY_SIZE(types); ti++) {
for (int i = 0; i < ARRAY_SIZE(files); i++) {
path_cat3_out(path, "allocation", types[ti], files[i]);
ret = sysfs_read_fsid_file_u64(fd, path, &tmp);
if (ret < 0)
continue;
if (i == 0)
pr_verbose(LOG_INFO, "%c%s:\n", toupper(types[ti][0]), types[ti] + 1);
if (strcmp(files[i], "bg_reclaim_threshold") == 0)
pr_verbose(LOG_INFO, " %-24s %14llu%%\n", files[i], tmp);
else
pr_verbose(LOG_INFO, " %-24s %16s\n", files[i], pretty_size_mode(tmp, unit_mode));
}
}
}
static void print_df_text(int fd, struct btrfs_ioctl_space_args *sargs, unsigned unit_mode)
{
u64 i;
struct btrfs_ioctl_space_info *sp = sargs->spaces;
u64 unusable;
bool ok;
for (i = 0; i < sargs->total_spaces; i++, sp++) {
unusable = device_get_zone_unusable(fd, sp->flags);
ok = (unusable != DEVICE_ZONE_UNUSABLE_UNKNOWN);
pr_verbose(LOG_DEFAULT, "%s, %s: total=%s, used=%s%s%s\n",
btrfs_group_type_str(sp->flags),
btrfs_group_profile_str(sp->flags),
pretty_size_mode(sp->total_bytes, unit_mode),
pretty_size_mode(sp->used_bytes, unit_mode),
(ok ? ", zone_unusable=" : ""),
(ok ? pretty_size_mode(unusable, unit_mode) : ""));
}
print_df_by_type(fd, unit_mode);
}
static const struct rowspec filesystem_df_rowspec[] = {
{ .key = "bg-type", .fmt = "%s", .out_json = "bg-type" },
{ .key = "bg-profile", .fmt = "%s", .out_json = "bg-profile" },
{ .key = "total", .fmt = "%llu", .out_json = "total" },
{ .key = "used", .fmt = "%llu", .out_json = "used" },
{ .key = "zone_unusable", .fmt = "%llu", .out_json = "zone_unusable" },
ROWSPEC_END
};
static void print_df_json(int fd, struct btrfs_ioctl_space_args *sargs)
{
struct format_ctx fctx;
u64 i;
struct btrfs_ioctl_space_info *sp = sargs->spaces;
u64 unusable;
bool ok;
fmt_start(&fctx, filesystem_df_rowspec, 1, 0);
fmt_print_start_group(&fctx, "filesystem-df", JSON_TYPE_ARRAY);
for (i = 0; i < sargs->total_spaces; i++, sp++) {
unusable = device_get_zone_unusable(fd, sp->flags);
ok = (unusable != DEVICE_ZONE_UNUSABLE_UNKNOWN);
fmt_print_start_group(&fctx, NULL, JSON_TYPE_MAP);
fmt_print(&fctx, "bg-type", btrfs_group_type_str(sp->flags));
fmt_print(&fctx, "bg-profile", btrfs_group_profile_str(sp->flags));
fmt_print(&fctx, "total", sp->total_bytes);
fmt_print(&fctx, "used", sp->used_bytes);
if (ok)
fmt_print(&fctx, "zone_unusable", unusable);
fmt_print_end_group(&fctx, NULL);
}
fmt_print_end_group(&fctx, "filesystem-df");
fmt_end(&fctx);
}
static int cmd_filesystem_df(const struct cmd_struct *cmd,
int argc, char **argv)
{
struct btrfs_ioctl_space_args *sargs = NULL;
int ret;
int fd;
char *path;
unsigned unit_mode;
unit_mode = get_unit_mode_from_arg(&argc, argv, 1);
clean_args_no_options(cmd, argc, argv);
if (check_argc_exact(argc - optind, 1))
return 1;
path = argv[optind];
fd = btrfs_open_dir(path);
if (fd < 0)
return 1;
ret = get_df(fd, &sargs);
if (ret == 0) {
if (bconf.output_format == CMD_FORMAT_JSON)
print_df_json(fd, sargs);
else
print_df_text(fd, sargs, unit_mode);
free(sargs);
} else {
errno = -ret;
error("get_df failed: %m");
}
btrfs_warn_multiple_profiles(fd);
close(fd);
return !!ret;
}
static DEFINE_COMMAND_WITH_FLAGS(filesystem_df, "df", CMD_FORMAT_JSON);
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 (*label && strcmp(label, search) == 0)
return 1;
if (strcmp(mnt, search) == 0)
return 1;
return 0;
}
/* Search for user visible uuid 'search' in registered filesystems */
static int uuid_search(struct btrfs_fs_devices *fs_devices, const char *search)
{
char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
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_entry(device, &fs_devices->devices, 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 splice_device_list(struct list_head *seed_devices,
struct list_head *all_devices)
{
struct btrfs_device *in_all, *next_all;
struct btrfs_device *in_seed, *next_seed;
list_for_each_entry_safe(in_all, next_all, all_devices, dev_list) {
list_for_each_entry_safe(in_seed, next_seed, seed_devices,
dev_list) {
if (in_all->devid == in_seed->devid) {
/*
* When do dev replace in a sprout fs
* to a dev in its seed fs, the replacing
* dev will reside in the sprout fs and
* the replaced dev will still exist
* in the seed fs.
* So pick the latest one when showing
* the sprout fs.
*/
if (in_all->generation
< in_seed->generation) {
list_del(&in_all->dev_list);
free(in_all);
} else if (in_all->generation
> in_seed->generation) {
list_del(&in_seed->dev_list);
free(in_seed);
}
break;
}
}
}
list_splice(seed_devices, all_devices);
}
static void print_devices(struct btrfs_fs_devices *fs_devices,
u64 *devs_found, unsigned unit_mode)
{
struct btrfs_device *device;
struct btrfs_fs_devices *cur_fs;
struct list_head *all_devices;
all_devices = &fs_devices->devices;
cur_fs = fs_devices->seed;
/* add all devices of seed fs to the fs to be printed */
while (cur_fs) {
splice_device_list(&cur_fs->devices, all_devices);
cur_fs = cur_fs->seed;
}
list_sort(NULL, all_devices, cmp_device_id);
list_for_each_entry(device, all_devices, dev_list) {
pr_verbose(LOG_DEFAULT, "\tdevid %4llu size %s used %s path %s\n",
device->devid,
pretty_size_mode(device->total_bytes, unit_mode),
pretty_size_mode(device->bytes_used, unit_mode),
device->name);
(*devs_found)++;
}
}
static void print_one_uuid(struct btrfs_fs_devices *fs_devices,
unsigned unit_mode)
{
char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
struct btrfs_device *device;
u64 devs_found = 0;
u64 total;
if (add_seen_fsid(fs_devices->fsid, seen_fsid_hash, -1))
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])
pr_verbose(LOG_DEFAULT, "Label: '%s' ", device->label);
else
pr_verbose(LOG_DEFAULT, "Label: none ");
total = device->total_devs;
pr_verbose(LOG_DEFAULT, " uuid: %s\n\tTotal devices %llu FS bytes used %s\n", uuidbuf,
total, pretty_size_mode(device->super_bytes_used, unit_mode));
print_devices(fs_devices, &devs_found, unit_mode);
if (devs_found < total) {
pr_verbose(LOG_DEFAULT, "\t*** Some devices missing\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, unsigned unit_mode)
{
int i;
int fd;
char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
struct btrfs_ioctl_dev_info_args *tmp_dev_info;
int ret;
ret = add_seen_fsid(fs_info->fsid, seen_fsid_hash, -1);
if (ret == -EEXIST)
return 0;
else if (ret)
return ret;
uuid_unparse(fs_info->fsid, uuidbuf);
if (label && *label)
pr_verbose(LOG_DEFAULT, "Label: '%s' ", label);
else
pr_verbose(LOG_DEFAULT, "Label: none ");
pr_verbose(LOG_DEFAULT, " uuid: %s\n\tTotal devices %llu FS bytes used %s\n", uuidbuf,
fs_info->num_devices,
pretty_size_mode(calc_used_bytes(space_info),
unit_mode));
for (i = 0; i < fs_info->num_devices; i++) {
char *canonical_path;
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) {
pr_verbose(LOG_DEFAULT, "\tdevid %4llu size 0 used 0 path %s MISSING\n",
tmp_dev_info->devid, tmp_dev_info->path);
continue;
}
close(fd);
canonical_path = path_canonicalize((char *)tmp_dev_info->path);
pr_verbose(LOG_DEFAULT, "\tdevid %4llu size %s used %s path %s\n",
tmp_dev_info->devid,
pretty_size_mode(tmp_dev_info->total_bytes, unit_mode),
pretty_size_mode(tmp_dev_info->bytes_used, unit_mode),
canonical_path);
free(canonical_path);
}
return 0;
}
static int btrfs_scan_kernel(void *search, unsigned unit_mode)
{
int ret = 0, fd;
int found = 0;
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 = NULL;
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) {
free(dev_info_arg);
dev_info_arg = 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;
/* skip all fs already shown as mounted fs */
if (is_seen_fsid(fs_info_arg.fsid, seen_fsid_hash))
continue;
ret = get_label_mounted(mnt->mnt_dir, label);
/* provide backward kernel compatibility */
if (ret == -ENOTTY)
ret = get_label_unmounted(
(const char *)dev_info_arg->path, label);
if (ret)
goto out;
if (search && !match_search_item_kernel(fs_info_arg.fsid,
mnt->mnt_dir, label, search)) {
continue;
}
fd = open(mnt->mnt_dir, O_RDONLY);
if ((fd != -1) && !get_df(fd, &space_info_arg)) {
/* Put space between filesystem entries for readability. */
if (found != 0)
pr_verbose(LOG_DEFAULT, "\n");
print_one_fs(&fs_info_arg, dev_info_arg,
space_info_arg, label, unit_mode);
free(space_info_arg);
memset(label, 0, sizeof(label));
found = 1;
}
if (fd != -1)
close(fd);
}
out:
free(dev_info_arg);
endmntent(f);
return !found;
}
static void free_fs_devices(struct btrfs_fs_devices *fs_devices)
{
struct btrfs_fs_devices *cur_seed, *next_seed;
struct btrfs_device *device;
while (!list_empty(&fs_devices->devices)) {
device = list_entry(fs_devices->devices.next,
struct btrfs_device, dev_list);
list_del(&device->dev_list);
free(device->name);
free(device->label);
free(device);
}
/* free seed fs chain */
cur_seed = fs_devices->seed;
fs_devices->seed = NULL;
while (cur_seed) {
next_seed = cur_seed->seed;
free(cur_seed);
cur_seed = next_seed;
}
list_del(&fs_devices->fs_list);
free(fs_devices);
}
static int copy_device(struct btrfs_device *dst,
struct btrfs_device *src)
{
dst->devid = src->devid;
memcpy(dst->uuid, src->uuid, BTRFS_UUID_SIZE);
if (src->name == NULL)
dst->name = NULL;
else {
dst->name = strdup(src->name);
if (!dst->name)
return -ENOMEM;
}
if (src->label == NULL)
dst->label = NULL;
else {
dst->label = strdup(src->label);
if (!dst->label) {
free(dst->name);
return -ENOMEM;
}
}
dst->total_devs = src->total_devs;
dst->super_bytes_used = src->super_bytes_used;
dst->total_bytes = src->total_bytes;
dst->bytes_used = src->bytes_used;
dst->generation = src->generation;
return 0;
}
static int copy_fs_devices(struct btrfs_fs_devices *dst,
struct btrfs_fs_devices *src)
{
struct btrfs_device *cur_dev, *dev_copy;
int ret = 0;
memcpy(dst->fsid, src->fsid, BTRFS_FSID_SIZE);
memcpy(dst->metadata_uuid, src->metadata_uuid, BTRFS_FSID_SIZE);
INIT_LIST_HEAD(&dst->devices);
dst->seed = NULL;
list_for_each_entry(cur_dev, &src->devices, dev_list) {
dev_copy = malloc(sizeof(*dev_copy));
if (!dev_copy) {
ret = -ENOMEM;
break;
}
ret = copy_device(dev_copy, cur_dev);
if (ret) {
free(dev_copy);
break;
}
list_add(&dev_copy->dev_list, &dst->devices);
dev_copy->fs_devices = dst;
}
return ret;
}
static int find_and_copy_seed(struct btrfs_fs_devices *seed,
struct btrfs_fs_devices *copy,
struct list_head *fs_uuids) {
struct btrfs_fs_devices *cur_fs;
list_for_each_entry(cur_fs, fs_uuids, fs_list)
if (!memcmp(seed->fsid, cur_fs->fsid, BTRFS_FSID_SIZE))
return copy_fs_devices(copy, cur_fs);
return 1;
}
static int has_seed_devices(struct btrfs_fs_devices *fs_devices)
{
struct btrfs_device *device;
int dev_cnt_total, dev_cnt = 0;
device = list_first_entry(&fs_devices->devices, struct btrfs_device,
dev_list);
dev_cnt_total = device->total_devs;
list_for_each_entry(device, &fs_devices->devices, dev_list)
dev_cnt++;
return dev_cnt_total != dev_cnt;
}
static int search_umounted_fs_uuids(struct list_head *all_uuids,
char *search, int *found)
{
struct btrfs_fs_devices *cur_fs, *fs_copy;
struct list_head *fs_uuids;
int ret = 0;
fs_uuids = btrfs_scanned_uuids();
/*
* The fs_uuids list is global, and open_ctree_* will
* modify it, make a private copy here
*/
list_for_each_entry(cur_fs, fs_uuids, fs_list) {
/* don't bother handle all fs, if search target specified */
if (search) {
if (uuid_search(cur_fs, search) == 0)
continue;
if (found)
*found = 1;
}
/* skip all fs already shown as mounted fs */
if (is_seen_fsid(cur_fs->fsid, seen_fsid_hash))
continue;
fs_copy = calloc(1, sizeof(*fs_copy));
if (!fs_copy) {
ret = -ENOMEM;
goto out;
}
ret = copy_fs_devices(fs_copy, cur_fs);
if (ret) {
free(fs_copy);
goto out;
}
list_add(&fs_copy->fs_list, all_uuids);
}
out:
return ret;
}
static int map_seed_devices(struct list_head *all_uuids)
{
struct btrfs_fs_devices *cur_fs, *cur_seed;
struct btrfs_fs_devices *seed_copy;
struct btrfs_fs_devices *opened_fs;
struct btrfs_device *device;
struct btrfs_fs_info *fs_info;
struct list_head *fs_uuids;
int ret = 0;
fs_uuids = btrfs_scanned_uuids();
list_for_each_entry(cur_fs, all_uuids, fs_list) {
struct open_ctree_args oca = { 0 };
device = list_first_entry(&cur_fs->devices,
struct btrfs_device, dev_list);
if (!device)
continue;
/* skip fs without seeds */
if (!has_seed_devices(cur_fs))
continue;
/*
* open_ctree_* detects seed/sprout mapping
*/
oca.filename = device->name;
oca.flags = OPEN_CTREE_PARTIAL;
fs_info = open_ctree_fs_info(&oca);
if (!fs_info)
continue;
/*
* copy the seed chain under the opened fs
*/
opened_fs = fs_info->fs_devices;
cur_seed = cur_fs;
while (opened_fs->seed) {
seed_copy = malloc(sizeof(*seed_copy));
if (!seed_copy) {
ret = -ENOMEM;
goto fail_out;
}
ret = find_and_copy_seed(opened_fs->seed, seed_copy,
fs_uuids);
if (ret) {
free(seed_copy);
goto fail_out;
}
cur_seed->seed = seed_copy;
opened_fs = opened_fs->seed;
cur_seed = cur_seed->seed;
}
close_ctree(fs_info->chunk_root);
}
out:
return ret;
fail_out:
close_ctree(fs_info->chunk_root);
goto out;
}
static const char * const cmd_filesystem_show_usage[] = {
"btrfs filesystem show [options] [<path>|<uuid>|<device>|label]",
"Show the structure of a filesystem",
"",
OPTLINE("-d|--all-devices", "show only disks under /dev containing btrfs filesystem"),
OPTLINE("-m|--mounted", "show only mounted btrfs"),
HELPINFO_UNITS_LONG,
"",
"If no argument is given, structure of all present filesystems is shown.",
NULL
};
static int cmd_filesystem_show(const struct cmd_struct *cmd,
int argc, char **argv)
{
LIST_HEAD(all_uuids);
struct btrfs_fs_devices *fs_devices;
struct btrfs_root *root = NULL;
char *search = NULL;
char *canon_path = NULL;
int ret;
/* default, search both kernel and udev */
int where = -1;
int type = 0;
char mp[PATH_MAX];
char path[PATH_MAX];
u8 fsid[BTRFS_FSID_SIZE];
char uuid_buf[BTRFS_UUID_UNPARSED_SIZE];
unsigned unit_mode;
int found = 0;
bool needs_newline = false;
unit_mode = get_unit_mode_from_arg(&argc, argv, 0);
optind = 0;
while (1) {
int c;
static const struct option long_options[] = {
{ "all-devices", no_argument, NULL, 'd'},
{ "mounted", no_argument, NULL, 'm'},
{ NULL, 0, NULL, 0 }
};
c = getopt_long(argc, argv, "dm", long_options, NULL);
if (c < 0)
break;
switch (c) {
case 'd':
where = BTRFS_SCAN_LBLKID;
break;
case 'm':
where = BTRFS_SCAN_MOUNTED;
break;
default:
usage_unknown_option(cmd, argv);
}
}
if (check_argc_max(argc, optind + 1))
return 1;
if (argc > optind) {
search = argv[optind];
if (*search == 0)
usage(cmd, 1);
type = check_arg_type(search);
/*
* For search is a device:
* realpath do /dev/mapper/XX => /dev/dm-X
* which is required by BTRFS_SCAN_DEV
* For search is a mountpoint:
* realpath do /mnt/btrfs/ => /mnt/btrfs
* which shall be recognized by btrfs_scan_kernel()
*/
if (realpath(search, path))
search = path;
/*
* Needs special handling if input arg is block dev And if
* input arg is mount-point just print it right away
*/
if (type == BTRFS_ARG_BLKDEV && where != BTRFS_SCAN_LBLKID) {
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) {
error("no btrfs on %s", search);
return 1;
}
uuid_unparse(fsid, uuid_buf);
search = uuid_buf;
type = BTRFS_ARG_UUID;
goto devs_only;
}
}
}
if (where == BTRFS_SCAN_LBLKID) {
/*
* Blkid needs canonicalized paths, eg. when the /dev/dm-0 is
* passed on command line.
*/
canon_path = path_canonicalize(search);
search = canon_path;
goto devs_only;
}
/* show mounted btrfs */
ret = btrfs_scan_kernel(search, unit_mode);
if (search && !ret) {
/* since search is found we are done */
goto out;
}
/*
* The above call will return 0 if it found anything, in those cases we
* need an extra newline below.
*/
needs_newline = !ret;
/* shows mounted only */
if (where == BTRFS_SCAN_MOUNTED)
goto out;
devs_only:
if (type == BTRFS_ARG_REG) {
root = open_ctree(search, btrfs_sb_offset(0), 0);
if (root)
ret = 0;
else
ret = 1;
} else {
ret = btrfs_scan_devices(0);
}
if (ret) {
error("blkid device scan returned %d", ret);
goto out;
}
/*
* The seed/sprout mappings are not detected yet, do mapping build for
* all umounted filesystems. But first, copy all unmounted UUIDs only
* to all_uuids.
*/
ret = search_umounted_fs_uuids(&all_uuids, search, &found);
if (ret < 0) {
error("searching target device returned error %d", ret);
goto out;
}
ret = map_seed_devices(&all_uuids);
if (ret) {
error("mapping seed devices returned error %d", ret);
goto out;
}
list_for_each_entry(fs_devices, &all_uuids, fs_list) {
/* Put space between filesystem entries for readability. */
if (needs_newline)
pr_verbose(LOG_DEFAULT, "\n");
print_one_uuid(fs_devices, unit_mode);
needs_newline = true;
}
if (search && !found) {
error("not a valid btrfs filesystem: %s", search);
ret = 1;
}
while (!list_empty(&all_uuids)) {
fs_devices = list_entry(all_uuids.next,
struct btrfs_fs_devices, fs_list);
free_fs_devices(fs_devices);
}
out:
free(canon_path);
if (root)
close_ctree(root);
free_seen_fsid(seen_fsid_hash);
return !!ret;
}
static DEFINE_SIMPLE_COMMAND(filesystem_show, "show");
static const char * const cmd_filesystem_sync_usage[] = {
"btrfs filesystem sync <path>",
"Force a sync on a filesystem",
NULL
};
static int cmd_filesystem_sync(const struct cmd_struct *cmd,
int argc, char **argv)
{
enum btrfs_util_error err;
clean_args_no_options(cmd, argc, argv);
if (check_argc_exact(argc - optind, 1))
return 1;
err = btrfs_util_sync(argv[optind]);
if (err) {
error_btrfs_util(err);
return 1;
}
return 0;
}
static DEFINE_SIMPLE_COMMAND(filesystem_sync, "sync");
static int parse_compress_type_arg(char *s)
{
int ret;
ret = parse_compress_type(s);
if (ret < 0) {
error("unknown compression type: %s", s);
exit(1);
}
return ret;
}
static const char * const cmd_filesystem_defrag_usage[] = {
"btrfs filesystem defragment [options] <file>|<dir> [<file>|<dir>...]",
"Defragment a file or a directory",
"",
OPTLINE("-r", "defragment files recursively"),
OPTLINE("-c[zlib,lzo,zstd]", "compress the file while defragmenting, optional parameter (no space in between)"),
OPTLINE("-f", "flush data to disk immediately after defragmenting"),
OPTLINE("-s start", "defragment only from byte onward"),
OPTLINE("-l len", "defragment only up to len bytes"),
OPTLINE("-t size", "target extent size hint (default: 32M)"),
OPTLINE("--step SIZE", "process the range in given steps, flush after each one"),
OPTLINE("-v", "deprecated, alias for global -v option"),
HELPINFO_INSERT_GLOBALS,
HELPINFO_INSERT_VERBOSE,
"",
"Warning: most Linux kernels will break up the ref-links of COW data",
"(e.g., files copied with 'cp --reflink', snapshots) which may cause",
"considerable increase of space usage. See btrfs-filesystem(8) for",
"more information.",
NULL
};
static struct btrfs_ioctl_defrag_range_args defrag_global_range;
static int defrag_global_errors;
static u64 defrag_global_step;
static int defrag_range_in_steps(int fd, const struct stat *st) {
int ret = 0;
u64 end;
struct btrfs_ioctl_defrag_range_args range;
if (defrag_global_step == 0)
return ioctl(fd, BTRFS_IOC_DEFRAG_RANGE, &defrag_global_range);
/*
* If start is set but length is not within or beyond the u64 range,
* assume it's the rest of the range.
*/
if (check_add_overflow(defrag_global_range.start, defrag_global_range.len, &end))
end = (u64)-1;
range = defrag_global_range;
range.flags |= BTRFS_DEFRAG_RANGE_START_IO;
while (range.start < end) {
u64 start;
range.len = defrag_global_step;
pr_verbose(LOG_VERBOSE, "defrag range step: start=%llu len=%llu step=%llu\n",
range.start, range.len, defrag_global_step);
ret = ioctl(fd, BTRFS_IOC_DEFRAG_RANGE, &range);
if (ret < 0)
return ret;
if (check_add_overflow(range.start, defrag_global_step, &start))
break;
range.start = start;
/*
* Avoid -EINVAL when starting the next ioctl, this can still
* happen if the file size changes since the time of stat().
*/
if (start >= (u64)st->st_size)
break;
}
return ret;
}
static int defrag_callback(const char *fpath, const struct stat *sb,
int typeflag, struct FTW *ftwbuf)
{
int ret = 0;
int fd = 0;
if ((typeflag == FTW_F) && S_ISREG(sb->st_mode)) {
pr_verbose(LOG_INFO, "%s\n", fpath);
fd = open(fpath, defrag_open_mode);
if (fd < 0) {
goto error;
}
ret = defrag_range_in_steps(fd, sb);
close(fd);
if (ret && errno == ENOTTY) {
error(
"defrag range ioctl not supported in this kernel version, 2.6.33 and newer is required");
defrag_global_errors++;
return ENOTTY;
}
if (ret) {
goto error;
}
}
return 0;
error:
error("defrag failed on %s: %m", fpath);
defrag_global_errors++;
return 0;
}
static int cmd_filesystem_defrag(const struct cmd_struct *cmd,
int argc, char **argv)
{
int fd;
bool flush = false;
u64 start = 0;
u64 len = (u64)-1;
u64 thresh;
int i;
bool recursive = false;
int ret = 0;
int compress_type = BTRFS_COMPRESS_NONE;
/*
* Kernel 4.19+ supports defragmention of files open read-only,
* otherwise it's an ETXTBSY error
*/
if (get_running_kernel_version() < KERNEL_VERSION(4,19,0))
defrag_open_mode = O_RDWR;
/*
* Kernel has a different default (256K) that is supposed to be safe,
* but it does not defragment very well. The 32M will likely lead to
* better results and is independent of the kernel default. We have to
* use the v2 defrag ioctl.
*/
thresh = SZ_32M;
/*
* Workaround to emulate previous behaviour, the log level has to be
* adjusted:
*
* - btrfs fi defrag - no file names printed (LOG_DEFAULT)
* - btrfs fi defrag -v - filenames printed (LOG_INFO)
* - btrfs -v fi defrag - filenames printed (LOG_INFO)
* - btrfs -v fi defrag -v - filenames printed (LOG_VERBOSE)
*/
if (bconf.verbose != BTRFS_BCONF_UNSET)
bconf.verbose++;
defrag_global_errors = 0;
defrag_global_errors = 0;
optind = 0;
while(1) {
enum { GETOPT_VAL_STEP = GETOPT_VAL_FIRST };
static const struct option long_options[] = {
{ "step", required_argument, NULL, GETOPT_VAL_STEP },
{ NULL, 0, NULL, 0 }
};
int c;
c = getopt_long(argc, argv, "vrc::fs:l:t:", long_options, NULL);
if (c < 0)
break;
switch(c) {
case 'c':
compress_type = BTRFS_COMPRESS_ZLIB;
if (optarg)
compress_type = parse_compress_type_arg(optarg);
break;
case 'f':
flush = true;
break;
case 'v':
if (bconf.verbose == BTRFS_BCONF_UNSET)
bconf.verbose = LOG_INFO;
else
bconf_be_verbose();
break;
case 's':
start = arg_strtou64_with_suffix(optarg);
break;
case 'l':
len = arg_strtou64_with_suffix(optarg);
break;
case 't':
thresh = arg_strtou64_with_suffix(optarg);
if (thresh > (u32)-1) {
warning(
"target extent size %llu too big, trimmed to %u",
thresh, (u32)-1);
thresh = (u32)-1;
}
break;
case 'r':
recursive = true;
break;
case GETOPT_VAL_STEP:
defrag_global_step = arg_strtou64_with_suffix(optarg);
if (defrag_global_step < SZ_256K) {
warning("step %llu too small, adjusting to 256KiB\n",
defrag_global_step);
defrag_global_step = SZ_256K;
}
break;
default:
usage_unknown_option(cmd, argv);
}
}
if (check_argc_min(argc - optind, 1))
return 1;
memset(&defrag_global_range, 0, sizeof(defrag_global_range));
defrag_global_range.start = start;
defrag_global_range.len = len;
defrag_global_range.extent_thresh = (u32)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;
/*
* Look for directory arguments and warn if the recursive mode is not
* requested, as this is not implemented as recursive defragmentation
* in kernel. The stat errors are silent here as we check them below.
*/
if (!recursive) {
int found = 0;
for (i = optind; i < argc; i++) {
struct stat st;
if (stat(argv[i], &st))
continue;
if (S_ISDIR(st.st_mode)) {
warning(
"directory specified but recursive mode not requested: %s",
argv[i]);
found = 1;
}
}
if (found) {
warning(
"a directory passed to the defrag ioctl will not process the files\n"
"recursively but will defragment the subvolume tree and the extent tree.\n"
"If this is not intended, please use option -r .");
}
}
for (i = optind; i < argc; i++) {
struct stat st;
int defrag_err = 0;
fd = btrfs_open_path(argv[i], defrag_open_mode == O_RDWR, false);
if (fd < 0) {
ret = fd;
goto next;
}
ret = fstat(fd, &st);
if (ret) {
error("failed to stat %s: %m", argv[i]);
ret = -errno;
goto next;
}
if (!(S_ISDIR(st.st_mode) || S_ISREG(st.st_mode))) {
error("%s is not a directory or a regular file",
argv[i]);
ret = -EINVAL;
goto next;
}
if (recursive && 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 {
pr_verbose(LOG_INFO, "%s\n", argv[i]);
ret = defrag_range_in_steps(fd, &st);
defrag_err = errno;
if (ret && defrag_err == ENOTTY) {
error(
"defrag range ioctl not supported in this kernel version, 2.6.33 and newer is required");
defrag_global_errors++;
close(fd);
break;
}
if (ret) {
errno = defrag_err;
error("defrag failed on %s: %m", argv[i]);
goto next;
}
}
next:
if (ret)
defrag_global_errors++;
close(fd);
}
if (defrag_global_errors)
pr_stderr(LOG_DEFAULT, "total %d failures\n", defrag_global_errors);
return !!defrag_global_errors;
}
static DEFINE_SIMPLE_COMMAND(filesystem_defrag, "defragment");
static const char * const cmd_filesystem_resize_usage[] = {
"btrfs filesystem resize [options] [devid:][+/-]<newsize>[kKmMgGtTpPeE]|[devid:]max <path>",
"Resize a filesystem",
"If 'max' is passed, the filesystem will occupy all available space",
"on the device 'devid'.",
"[kK] means KiB, which denotes 1KiB = 1024B, 1MiB = 1024KiB, etc.",
"",
OPTLINE("--enqueue", "wait if there's another exclusive operation running, otherwise continue"),
NULL
};
static int check_resize_args(const char *amount, const char *path, u64 *devid_ret) {
struct btrfs_ioctl_fs_info_args fi_args;
struct btrfs_ioctl_dev_info_args *di_args = NULL;
int ret, i, dev_idx = -1;
u64 devid = 1;
u64 mindev = (u64)-1;
int mindev_idx = 0;
const char *res_str = NULL;
char *devstr = NULL, *sizestr = NULL;
u64 new_size = 0, old_size = 0, diff = 0;
int mod = 0;
char amount_dup[BTRFS_VOL_NAME_MAX];
*devid_ret = (u64)-1;
ret = get_fs_info(path, &fi_args, &di_args);
if (ret) {
error("unable to retrieve fs info");
return 1;
}
if (!fi_args.num_devices) {
error("no devices found");
ret = 1;
goto out;
}
ret = snprintf(amount_dup, BTRFS_VOL_NAME_MAX, "%s", amount);
if (strlen(amount) != ret) {
error("newsize argument is too long");
ret = 1;
goto out;
}
ret = 0;
/* Cancel does not need to determine the device number. */
if (strcmp(amount, "cancel") == 0) {
/* Different format, print and exit */
pr_verbose(LOG_DEFAULT, "Request to cancel resize\n");
goto out;
}
sizestr = amount_dup;
devstr = strchr(sizestr, ':');
if (devstr) {
sizestr = devstr + 1;
*devstr = 0;
devstr = amount_dup;
errno = 0;
devid = strtoull(devstr, NULL, 10);
if (errno) {
error("failed to parse devid %s: %m", devstr);
ret = 1;
goto out;
}
}
dev_idx = -1;
for(i = 0; i < fi_args.num_devices; i++) {
if (di_args[i].devid < mindev) {
mindev = di_args[i].devid;
mindev_idx = i;
}
if (di_args[i].devid == devid) {
dev_idx = i;
break;
}
}
if (devstr && dev_idx < 0) {
/* Devid specified but not found. */
error("cannot find devid: %lld", devid);
ret = 1;
goto out;
} else if (!devstr && devid == 1 && dev_idx < 0) {
/*
* No device specified, assuming implicit 1 but it does not
* exist. Use minimum device as fallback.
*/
warning("no devid specified means devid 1 which does not exist, using\n"
"\t lowest devid %llu as a fallback", mindev);
*devid_ret = mindev;
devid = mindev;
dev_idx = mindev_idx;
} else {
/*
* Use the initial value 1 or the parsed number but don't
* return it by devid_ret as the resize string works as-is.
*/
}
if (strcmp(sizestr, "max") == 0) {
res_str = "max";
} else {
if (sizestr[0] == '-') {
mod = -1;
sizestr++;
} else if (sizestr[0] == '+') {
mod = 1;
sizestr++;
}
ret = parse_u64_with_suffix(sizestr, &diff);
if (ret < 0) {
error("failed to parse size %s", sizestr);
ret = 1;
goto out;
}
old_size = di_args[dev_idx].total_bytes;
/* For target sizes without +/- sign prefix (e.g. 1:150g) */
if (mod == 0) {
new_size = diff;
} else if (mod < 0) {
if (diff > old_size) {
error("current size is %s which is smaller than %s",
pretty_size_mode(old_size, UNITS_DEFAULT),
pretty_size_mode(diff, UNITS_DEFAULT));
ret = 1;
goto out;
}
new_size = old_size - diff;
} else if (mod > 0) {
if (diff > ULLONG_MAX - old_size) {
error("increasing %s is out of range",
pretty_size_mode(diff, UNITS_DEFAULT));
ret = 1;
goto out;
}
new_size = old_size + diff;
}
new_size = round_down(new_size, fi_args.sectorsize);
res_str = pretty_size_mode(new_size, UNITS_DEFAULT);
}
pr_verbose(LOG_DEFAULT, "Resize device id %lld (%s) from %s to %s\n", devid,
di_args[dev_idx].path,
pretty_size_mode(di_args[dev_idx].total_bytes, UNITS_DEFAULT),
res_str);
if (new_size < 256 * SZ_1M)
warning("the new size %lld (%s) is < 256MiB, this may be rejected by kernel",
new_size, pretty_size_mode(new_size, UNITS_DEFAULT));
out:
free(di_args);
return ret;
}
static int cmd_filesystem_resize(const struct cmd_struct *cmd,
int argc, char **argv)
{
struct btrfs_ioctl_vol_args args;
int fd, res, len, e;
char *amount, *path;
u64 devid;
int ret;
bool enqueue = false;
bool cancel = false;
/*
* Simplified option parser, accept only long options, the resize value
* could be negative and is recognized as short options by getopt
*/
for (optind = 1; optind < argc; optind++) {
if (strcmp(argv[optind], "--enqueue") == 0) {
enqueue = true;
} else if (strcmp(argv[optind], "--") == 0) {
/* Separator: options -- non-options */
} else if (strncmp(argv[optind], "--", 2) == 0) {
/* Emulate what getopt does on unknown option */
optind++;
usage_unknown_option(cmd, argv);
} else {
break;
}
}
if (check_argc_exact(argc - optind, 2))
return 1;
amount = argv[optind];
path = argv[optind + 1];
len = strlen(amount);
if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
error("resize value too long (%s)", amount);
return 1;
}
cancel = (strcmp("cancel", amount) == 0);
fd = btrfs_open_dir(path);
if (fd < 0) {
/* The path is a directory */
if (fd == -ENOTDIR) {
error(
"resize works on mounted filesystems and accepts only\n"
"directories as argument. Passing file containing a btrfs image\n"
"would resize the underlying filesystem instead of the image.\n");
}
return 1;
}
/*
* Check if there's an exclusive operation running if possible, otherwise
* let kernel handle it. Cancel request is completely handled in kernel
* so make it pass.
*/
if (!cancel) {
ret = check_running_fs_exclop(fd, BTRFS_EXCLOP_RESIZE, enqueue);
if (ret != 0) {
if (ret < 0)
error(
"unable to check status of exclusive operation: %m");
close(fd);
return 1;
}
}
ret = check_resize_args(amount, path, &devid);
if (ret != 0) {
close(fd);
return 1;
}
memset(&args, 0, sizeof(args));
if (devid == (u64)-1) {
/* Ok to copy the string verbatim. */
strncpy_null(args.name, amount, sizeof(args.name));
} else {
/* The implicit devid 1 needs to be adjusted. */
snprintf(args.name, sizeof(args.name) - 1, "%llu:%s", devid, amount);
}
pr_verbose(LOG_VERBOSE, "adjust resize argument to: %s\n", args.name);
res = ioctl(fd, BTRFS_IOC_RESIZE, &args);
e = errno;
close(fd);
if( res < 0 ){
switch (e) {
case EFBIG:
error("unable to resize '%s': no enough free space",
path);
break;
default:
error("unable to resize '%s': %m", path);
break;
}
return 1;
} else if (res > 0) {
const char *err_str = btrfs_err_str(res);
if (err_str) {
error("resizing of '%s' failed: %s", path, err_str);
} else {
error("resizing of '%s' failed: unknown error %d",
path, res);
}
return 1;
}
return 0;
}
static DEFINE_SIMPLE_COMMAND(filesystem_resize, "resize");
static const char * const cmd_filesystem_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_filesystem_label(const struct cmd_struct *cmd,
int argc, char **argv)
{
clean_args_no_options(cmd, argc, argv);
if (check_argc_min(argc - optind, 1) ||
check_argc_max(argc - optind, 2))
return 1;
if (argc - optind > 1) {
return set_label(argv[optind], argv[optind + 1]);
} else {
char label[BTRFS_LABEL_SIZE];
int ret;
ret = get_label(argv[optind], label);
if (!ret)
pr_verbose(LOG_DEFAULT, "%s\n", label);
return ret;
}
}
static DEFINE_SIMPLE_COMMAND(filesystem_label, "label");
static const char * const cmd_filesystem_balance_usage[] = {
"btrfs filesystem balance [args...] (alias of \"btrfs balance\")",
"Please see \"btrfs balance --help\" for more information.",
NULL
};
static int cmd_filesystem_balance(const struct cmd_struct *unused,
int argc, char **argv)
{
return cmd_execute(&cmd_struct_balance, argc, argv);
}
/*
* Compatible old "btrfs filesystem balance" command
*
* We can't use cmd_struct_balance directly here since this alias is
* for historical compatibility and is hidden.
*/
static DEFINE_COMMAND(filesystem_balance, "balance", cmd_filesystem_balance,
cmd_filesystem_balance_usage, NULL, CMD_HIDDEN);
static const char * const cmd_filesystem_mkswapfile_usage[] = {
"btrfs filesystem mkswapfile <file>",
"Create a new file that's suitable and formatted as a swapfile.",
"Create a new file that's suitable and formatted as a swapfile. Default",
"size is 2GiB, minimum size is 40KiB.",
"",
OPTLINE("-s|--size SIZE", "create file of SIZE (accepting k/m/g/e/p suffix)"),
OPTLINE("-U|--uuid UUID", "specify UUID to use, or a special value: clear (all zeros), random, time (time-based random)"),
HELPINFO_INSERT_GLOBALS,
HELPINFO_INSERT_VERBOSE,
HELPINFO_INSERT_QUIET,
NULL
};
/*
* Swap signature in the first 4KiB, v2, no label:
*
* 00000400 .. = 01 00 00 00 ff ff 03 00 00 00 00 00 cb 70 8e 60
* ^^^^^^^^^^^ ^^^^^^^^^^^
* page count 4B uuid 4B
* 00000420 .. = 1d fb 4e ca be d4 3f 1f 6a 6b 0c 03 00 00 00 00
* ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
* uuid 8B
* 00000ff0 .. = 00 00 00 00 00 00 53 57 41 50 53 50 41 43 45 32
* S W A P S P A C E 2
*/
static int write_swap_signature(int fd, u32 page_count, const uuid_t uuid)
{
int ret;
static unsigned char swap[SZ_4K] = {
[0x400] = 0x01,
/* 0x404 .. 0x407 number of pages (little-endian) */
/* 0x408 .. 0x40b number of bad pages (unused) */
/* 0x40c .. 0x42b UUID */
/* Last bytes of the page */
[0xff6] = 'S',
[0xff7] = 'W',
[0xff8] = 'A',
[0xff9] = 'P',
[0xffa] = 'S',
[0xffb] = 'P',
[0xffc] = 'A',
[0xffd] = 'C',
[0xffe] = 'E',
[0xfff] = '2',
};
u32 *pages = (u32 *)&swap[0x404];
*pages = cpu_to_le32(page_count);
memcpy(&swap[0x40c], uuid, 16);
ret = pwrite(fd, swap, SZ_4K, 0);
return ret;
}
static int cmd_filesystem_mkswapfile(const struct cmd_struct *cmd, int argc, char **argv)
{
int ret;
int fd;
const char *fname;
unsigned long flags;
u64 size = SZ_2G;
u64 page_count;
uuid_t uuid;
uuid_generate(uuid);
optind = 0;
while (1) {
int c;
static const struct option long_options[] = {
{ "size", required_argument, NULL, 's' },
{ "uuid", required_argument, NULL, 'U' },
{ NULL, 0, NULL, 0 }
};
c = getopt_long(argc, argv, "s:U:", long_options, NULL);
if (c < 0)
break;
switch (c) {
case 's':
size = arg_strtou64_with_suffix(optarg);
/* Minimum limit reported by mkswap */
if (size < 40 * SZ_1K) {
error("swapfile needs to be at least 40 KiB");
return 1;
}
break;
case 'U':
if (strcmp(optarg, "clear") == 0) {
uuid_clear(uuid);
} else if (strcmp(optarg, "random") == 0) {
uuid_generate(uuid);
} else if (strcmp(optarg, "time") == 0) {
uuid_generate_time(uuid);
} else {
ret = uuid_parse(optarg, uuid);
if (ret == -1) {
error("UUID not recognized: %s", optarg);
return 1;
}
}
break;
default:
usage_unknown_option(cmd, argv);
}
}
if (check_argc_exact(argc - optind, 1))
return 1;
fname = argv[optind];
pr_verbose(LOG_INFO, "create file %s with mode 0600\n", fname);
fd = open(fname, O_RDWR | O_CREAT | O_EXCL, 0600);
if (fd < 0) {
error("cannot create new swapfile: %m");
return 1;
}
ret = ftruncate(fd, 0);
if (ret < 0) {
error("cannot truncate file: %m");
ret = 1;
goto out;
}
pr_verbose(LOG_INFO, "set NOCOW attribute\n");
flags = FS_NOCOW_FL;
ret = ioctl(fd, FS_IOC_SETFLAGS, &flags);
if (ret < 0) {
error("cannot set NOCOW flag: %m");
ret = 1;
goto out;
}
page_count = size / SZ_4K;
if (page_count <= 10) {
error("file too short");
ret = 1;
goto out;
}
/* First file page with header */
page_count--;
if (page_count > (u32)-1) {
error("file too big");
ret = 1;
goto out;
}
size = round_down(size, SZ_4K);
pr_verbose(LOG_INFO, "fallocate to size %llu, page size %u, %llu pages\n",
size, SZ_4K, page_count);
ret = fallocate(fd, 0, 0, size);
if (ret < 0) {
error("cannot fallocate file: %m");
ret = 1;
goto out;
}
pr_verbose(LOG_INFO, "write swap signature\n");
ret = write_swap_signature(fd, page_count, uuid);
if (ret < 0) {
error("cannot write swap signature: %m");
ret = 1;
goto out;
}
pr_verbose(LOG_DEFAULT, "create swapfile %s size %s (%llu)\n",
fname, pretty_size_mode(size, UNITS_HUMAN), size);
out:
close(fd);
return 0;
}
static DEFINE_SIMPLE_COMMAND(filesystem_mkswapfile, "mkswapfile");
static const char filesystem_cmd_group_info[] =
"overall filesystem tasks and information";
static const struct cmd_group filesystem_cmd_group = {
filesystem_cmd_group_usage, filesystem_cmd_group_info, {
&cmd_struct_filesystem_df,
&cmd_struct_filesystem_du,
&cmd_struct_filesystem_show,
&cmd_struct_filesystem_sync,
&cmd_struct_filesystem_defrag,
&cmd_struct_filesystem_balance,
&cmd_struct_filesystem_resize,
&cmd_struct_filesystem_label,
&cmd_struct_filesystem_usage,
&cmd_struct_filesystem_mkswapfile,
NULL
}
};
DEFINE_GROUP_COMMAND_TOKEN(filesystem);