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.
*/
#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 "commands.h"
#include "cmds-fi-usage.h"
#include "list_sort.h"
#include "disk-io.h"
#include "cmds-fi-du.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 is_seen_fsid(u8 *fsid)
{
u8 hash = fsid[0];
int slot = hash % SEEN_FSID_HASH_SIZE;
struct seen_fsid *seen = seen_fsid_hash[slot];
btrfs-progs: Check if the FSID was seen by comparing full UUID is_seen_fsid() uses simple hash to check if FS was seen before at walking on FS list in 'filesystem show' command: hash key is first byte of the UUID. This function doesn't check full UUID then, so, if there are two FS with same first byte in UUIDs exist, only one will be shown: root@test:~# btrfs fi show Label: 'System' uuid: 688cb918-7bac-4c8e-9b11-8d047eb14cf4 Total devices 2 FS bytes used 1.76GiB devid 1 size 3.46TiB used 4.01GiB path /dev/sda2 devid 2 size 6.91TiB used 4.01GiB path /dev/sdb2 Global spare root@test:~# grep btrfs /proc/mounts /dev/sda2 / btrfs rw,relatime,space_cache,subvolid=256,subvol=/root 0 0 /dev/sdc /media/688cb918-7bac-4c8e-9b11-8d047eb14cf4 btrfs rw,relatime,space_cache,subvolid=5,subvol=/ 0 0 root@test:~# btrfs fi show --all-devices Label: 'System' uuid: 688cb918-7bac-4c8e-9b11-8d047eb14cf4 Total devices 2 FS bytes used 1.76GiB devid 1 size 3.46TiB used 4.03GiB path /dev/sda2 devid 2 size 6.91TiB used 4.01GiB path /dev/sdb2 Label: 'test' uuid: 683b1a80-ca7f-4c4d-b87b-7155401a4d18 Total devices 7 FS bytes used 2.06MiB devid 1 size 7.28TiB used 1.57GiB path /dev/sdc devid 2 size 7.28TiB used 1.57GiB path /dev/sdd devid 3 size 7.28TiB used 1.57GiB path /dev/sde devid 4 size 7.28TiB used 1.57GiB path /dev/sdf devid 5 size 7.28TiB used 1.57GiB path /dev/sdg devid 6 size 7.28TiB used 1.57GiB path /dev/sdh devid 7 size 7.28TiB used 1.57GiB path /dev/sdi To resolve this collision, search for full FSID in the list of seen filesystems. Signed-off-by: Yauhen Kharuzhy <yauhen.kharuzhy@zavadatar.com> Signed-off-by: David Sterba <dsterba@suse.com>
2016-04-14 22:21:11 +00:00
while (seen) {
if (memcmp(seen->fsid, fsid, BTRFS_FSID_SIZE) == 0)
return 1;
seen = seen->next;
}
return 0;
}
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_filesystem_df_usage[] = {
"btrfs filesystem df [options] <path>",
"Show space usage information for a mount point",
HELPINFO_UNITS_SHORT_LONG,
NULL
};
static int get_df(int fd, struct btrfs_ioctl_space_args **sargs_ret)
{
u64 count = 0;
int ret;
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);
if (ret < 0) {
error("cannot get space info: %s\n", strerror(errno));
free(sargs);
return -errno;
}
/* 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)
return -ENOMEM;
sargs->space_slots = count;
sargs->total_spaces = 0;
ret = ioctl(fd, BTRFS_IOC_SPACE_INFO, sargs);
if (ret < 0) {
error("cannot get space info with %llu slots: %s",
count, strerror(errno));
free(sargs);
return -errno;
}
*sargs_ret = sargs;
return 0;
}
static void print_df(struct btrfs_ioctl_space_args *sargs, unsigned unit_mode)
{
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",
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));
}
}
static int cmd_filesystem_df(int argc, char **argv)
{
struct btrfs_ioctl_space_args *sargs = NULL;
int ret;
int fd;
char *path;
DIR *dirstream = NULL;
unsigned unit_mode;
unit_mode = get_unit_mode_from_arg(&argc, argv, 1);
clean_args_no_options(argc, argv, cmd_filesystem_df_usage);
if (check_argc_exact(argc - optind, 1))
usage(cmd_filesystem_df_usage);
path = argv[optind];
fd = btrfs_open_dir(path, &dirstream, 1);
if (fd < 0)
return 1;
ret = get_df(fd, &sargs);
if (ret == 0) {
print_df(sargs, unit_mode);
free(sargs);
} else {
error("get_df failed %s", 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 (*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, const 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 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) {
printf("\tdevid %4llu size %s used %s path %s\n",
(unsigned long long)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))
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_mode(device->super_bytes_used, unit_mode));
print_devices(fs_devices, &devs_found, unit_mode);
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, unsigned unit_mode)
{
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 && *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_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) {
missing = 1;
continue;
}
close(fd);
canonical_path = canonicalize_path((char *)tmp_dev_info->path);
printf("\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);
}
if (missing)
printf("\t*** Some devices missing\n");
printf("\n");
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))
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)) {
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 int dev_to_fsid(const char *dev, __u8 *fsid)
{
struct btrfs_super_block *disk_super;
char buf[BTRFS_SUPER_INFO_SIZE];
int ret;
int fd;
fd = open(dev, O_RDONLY);
if (fd < 0) {
ret = -errno;
return ret;
}
disk_super = (struct btrfs_super_block *)buf;
ret = btrfs_read_dev_super(fd, disk_super,
BTRFS_SUPER_INFO_OFFSET, SBREAD_DEFAULT);
if (ret)
goto out;
memcpy(fsid, disk_super->fsid, BTRFS_FSID_SIZE);
ret = 0;
out:
close(fd);
return ret;
}
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->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);
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, 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, 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))
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->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, list) {
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
*/
fs_info = open_ctree_fs_info(device->name, 0, 0, 0,
OPEN_CTREE_PARTIAL);
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",
"-d|--all-devices show only disks under /dev containing btrfs filesystem",
"-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(int argc, char **argv)
{
LIST_HEAD(all_uuids);
struct btrfs_fs_devices *fs_devices;
char *search = 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;
unit_mode = get_unit_mode_from_arg(&argc, argv, 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(cmd_filesystem_show_usage);
}
}
if (check_argc_max(argc, optind + 1))
usage(cmd_filesystem_show_usage);
if (argc > optind) {
search = argv[optind];
if (*search == 0)
usage(cmd_filesystem_show_usage);
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)
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;
}
/* shows mounted only */
if (where == BTRFS_SCAN_MOUNTED)
goto out;
devs_only:
ret = btrfs_scan_devices();
if (ret) {
error("blkid device scan returned %d\n", ret);
return 1;
}
ret = search_umounted_fs_uuids(&all_uuids, search, &found);
if (ret < 0) {
error("searching target device returned error %d", ret);
return 1;
}
/*
* The seed/sprout mapping are not detected yet,
* do mapping build for all umounted fs
*/
ret = map_seed_devices(&all_uuids);
if (ret) {
error("mapping seed devices returned error %d", ret);
return 1;
}
list_for_each_entry(fs_devices, &all_uuids, list)
print_one_uuid(fs_devices, unit_mode);
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, list);
free_fs_devices(fs_devices);
}
out:
free_seen_fsid();
return ret;
}
static const char * const cmd_filesystem_sync_usage[] = {
"btrfs filesystem sync <path>",
"Force a sync on a filesystem",
NULL
};
static int cmd_filesystem_sync(int argc, char **argv)
{
int fd, res, e;
char *path;
DIR *dirstream = NULL;
clean_args_no_options(argc, argv, cmd_filesystem_sync_usage);
if (check_argc_exact(argc - optind, 1))
usage(cmd_filesystem_sync_usage);
path = argv[optind];
fd = btrfs_open_dir(path, &dirstream, 1);
if (fd < 0)
return 1;
res = ioctl(fd, BTRFS_IOC_SYNC);
e = errno;
close_file_or_dir(fd, dirstream);
if( res < 0 ){
error("sync ioctl failed on '%s': %s", 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 {
error("unknown compression type %s", s);
exit(1);
};
}
static const char * const cmd_filesystem_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 target extent size hint (default: 32M)",
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 err = 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);
if (fd < 0) {
err = errno;
goto error;
}
ret = do_defrag(fd, defrag_global_fancy_ioctl, &defrag_global_range);
close(fd);
if (ret && errno == ENOTTY && defrag_global_fancy_ioctl) {
error("defrag range ioctl not "
"supported in this kernel, please try "
"without any options.");
defrag_global_errors++;
return ENOTTY;
}
if (ret) {
err = errno;
goto error;
}
}
return 0;
error:
error("defrag failed on %s: %s", fpath, strerror(err));
defrag_global_errors++;
return 0;
}
static int cmd_filesystem_defrag(int argc, char **argv)
{
int fd;
int flush = 0;
u64 start = 0;
u64 len = (u64)-1;
u64 thresh;
int i;
int recursive = 0;
int ret = 0;
int e = 0;
int compress_type = BTRFS_COMPRESS_NONE;
DIR *dirstream;
/*
* 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.
*/
thresh = 32 * 1024 * 1024;
defrag_global_errors = 0;
defrag_global_verbose = 0;
defrag_global_errors = 0;
defrag_global_fancy_ioctl = 0;
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);
if (thresh > (u32)-1) {
warning(
"target extent size %llu too big, trimmed to %u",
thresh, (u32)-1);
thresh = (u32)-1;
}
defrag_global_fancy_ioctl = 1;
break;
case 'r':
recursive = 1;
break;
default:
usage(cmd_filesystem_defrag_usage);
}
}
if (check_argc_min(argc - optind, 1))
usage(cmd_filesystem_defrag_usage);
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;
for (i = optind; i < argc; i++) {
struct stat st;
dirstream = NULL;
fd = open_file_or_dir(argv[i], &dirstream);
if (fd < 0) {
error("cannot open %s: %s\n", argv[i],
strerror(errno));
defrag_global_errors++;
close_file_or_dir(fd, dirstream);
continue;
}
if (fstat(fd, &st)) {
error("failed to stat %s: %s",
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))) {
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) {
error("defrag range ioctl not "
"supported in this kernel, please try "
"without any options.");
defrag_global_errors++;
break;
}
if (ret) {
error("defrag failed on %s: %s", argv[i], strerror(e));
defrag_global_errors++;
}
}
if (defrag_global_errors)
fprintf(stderr, "total %d failures\n", defrag_global_errors);
return !!defrag_global_errors;
}
static const char * const cmd_filesystem_resize_usage[] = {
"btrfs filesystem resize [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.",
NULL
};
static int cmd_filesystem_resize(int argc, char **argv)
{
struct btrfs_ioctl_vol_args args;
int fd, res, len, e;
char *amount, *path;
DIR *dirstream = NULL;
struct stat st;
clean_args_no_options_relaxed(argc, argv, cmd_filesystem_resize_usage);
if (check_argc_exact(argc - optind, 2))
usage(cmd_filesystem_resize_usage);
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;
}
res = stat(path, &st);
if (res < 0) {
error("resize: cannot stat %s: %s", path, strerror(errno));
return 1;
}
if (!S_ISDIR(st.st_mode)) {
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;
}
fd = btrfs_open_dir(path, &dirstream, 1);
if (fd < 0)
return 1;
printf("Resize '%s' of '%s'\n", path, amount);
memset(&args, 0, sizeof(args));
strncpy_null(args.name, amount);
res = ioctl(fd, BTRFS_IOC_RESIZE, &args);
e = errno;
close_file_or_dir(fd, dirstream);
if( res < 0 ){
switch (e) {
case EFBIG:
error("unable to resize '%s': no enough free space",
path);
break;
default:
error("unable to resize '%s': %s", path, strerror(e));
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 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(int argc, char **argv)
{
clean_args_no_options(argc, argv, cmd_filesystem_label_usage);
if (check_argc_min(argc - optind, 1) ||
check_argc_max(argc - optind, 2))
usage(cmd_filesystem_label_usage);
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)
fprintf(stdout, "%s\n", label);
return ret;
}
}
static const char filesystem_cmd_group_info[] =
"overall filesystem tasks and information";
const struct cmd_group filesystem_cmd_group = {
filesystem_cmd_group_usage, filesystem_cmd_group_info, {
{ "df", cmd_filesystem_df, cmd_filesystem_df_usage, NULL, 0 },
{ "du", cmd_filesystem_du, cmd_filesystem_du_usage, NULL, 0 },
{ "show", cmd_filesystem_show, cmd_filesystem_show_usage, NULL,
0 },
{ "sync", cmd_filesystem_sync, cmd_filesystem_sync_usage, NULL,
0 },
{ "defragment", cmd_filesystem_defrag,
cmd_filesystem_defrag_usage, NULL, 0 },
{ "balance", cmd_balance, NULL, &balance_cmd_group,
CMD_HIDDEN },
{ "resize", cmd_filesystem_resize, cmd_filesystem_resize_usage,
NULL, 0 },
{ "label", cmd_filesystem_label, cmd_filesystem_label_usage,
NULL, 0 },
{ "usage", cmd_filesystem_usage,
cmd_filesystem_usage_usage, NULL, 0 },
NULL_CMD_STRUCT
}
};
int cmd_filesystem(int argc, char **argv)
{
return handle_command_group(&filesystem_cmd_group, argc, argv);
}