btrfs-progs/cmds-filesystem.c
Gui Hecheng 0c13451796 btrfs-progs: skip fs with no seed when build seed/sprout mapping for fi show
There is no need to try to build seed/sprout mapping for those btrfs
without seed devices, so just skip such fs.
We could get the total number of devices from the disk super block, if it
equals the number of items in list @fs_devices->devices, then there shouldn't
be any seed devices.

Signed-off-by: Gui Hecheng <guihc.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
2014-12-04 16:48:13 +01:00

1348 lines
30 KiB
C

/*
* 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 "cmds-fi-disk_usage.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 is_seen_fsid(u8 *fsid)
{
u8 hash = fsid[0];
int slot = hash % SEEN_FSID_HASH_SIZE;
struct seen_fsid *seen = seen_fsid_hash[slot];
return seen ? 1 : 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",
"-b|--raw raw numbers in bytes",
"-h human friendly numbers, base 1024 (default)",
"-H human friendly numbers, base 1000",
"--iec use 1024 as a base (KiB, MiB, GiB, TiB)",
"--si use 1000 as a base (kB, MB, GB, TB)",
"-k|--kbytes show sizes in KiB, or kB with --si",
"-m|--mbytes show sizes in MiB, or MB with --si",
"-g|--gbytes show sizes in GiB, or GB with --si",
"-t|--tbytes show sizes in TiB, or TB with --si",
NULL
};
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)
return -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, 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 = UNITS_DEFAULT;
while (1) {
int long_index;
static const struct option long_options[] = {
{ "raw", no_argument, NULL, 'b'},
{ "kbytes", no_argument, NULL, 'k'},
{ "mbytes", no_argument, NULL, 'm'},
{ "gbytes", no_argument, NULL, 'g'},
{ "tbytes", no_argument, NULL, 't'},
{ "si", no_argument, NULL, 256},
{ "iec", no_argument, NULL, 257},
};
int c = getopt_long(argc, argv, "bhHkmgt", long_options,
&long_index);
if (c < 0)
break;
switch (c) {
case 'b':
unit_mode = UNITS_RAW;
break;
case 'k':
units_set_base(&unit_mode, UNITS_KBYTES);
break;
case 'm':
units_set_base(&unit_mode, UNITS_MBYTES);
break;
case 'g':
units_set_base(&unit_mode, UNITS_GBYTES);
break;
case 't':
units_set_base(&unit_mode, UNITS_TBYTES);
break;
case 'h':
unit_mode = UNITS_HUMAN_BINARY;
break;
case 'H':
unit_mode = UNITS_HUMAN_DECIMAL;
break;
case 256:
units_set_mode(&unit_mode, UNITS_DECIMAL);
break;
case 257:
units_set_mode(&unit_mode, UNITS_BINARY);
break;
default:
usage(cmd_filesystem_df_usage);
}
}
if (check_argc_exact(argc, optind + 1))
usage(cmd_filesystem_df_usage);
path = argv[optind];
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 == 0) {
print_df(sargs, unit_mode);
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 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)
{
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(device->total_bytes),
pretty_size(device->bytes_used), device->name);
(*devs_found)++;
}
}
static void print_one_uuid(struct btrfs_fs_devices *fs_devices)
{
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(device->super_bytes_used));
print_devices(fs_devices, &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++) {
char *canonical_path;
tmp_dev_info = (struct btrfs_ioctl_dev_info_args *)&dev_info[i];
canonical_path = canonicalize_path((char *)tmp_dev_info->path);
/* 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),
canonical_path);
free(canonical_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;
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) {
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);
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));
found = 1;
}
if (fd != -1)
close(fd);
kfree(dev_info_arg);
}
out:
endmntent(f);
return !found;
}
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, 0);
if (ret)
goto out;
memcpy(fsid, disk_super->fsid, BTRFS_FSID_SIZE);
ret = 0;
out:
close(fd);
free(buf);
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)
{
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;
ret = 1;
}
/* skip all fs already shown as mounted fs */
if (is_seen_fsid(cur_fs->fsid))
continue;
fs_copy = malloc(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,
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_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)
{
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[BTRFS_PATH_NAME_MAX + 1];
char path[PATH_MAX];
__u8 fsid[BTRFS_FSID_SIZE];
char uuid_buf[BTRFS_UUID_UNPARSED_SIZE];
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_LBLKID;
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);
/*
* 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)) {
fprintf(stderr, "ERROR: Could not show %s: %s\n",
search, strerror(errno));
return 1;
}
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) {
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_LBLKID)
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 = btrfs_scan_lblkid();
if (ret) {
fprintf(stderr, "ERROR: %d while scanning\n", ret);
return 1;
}
found = search_umounted_fs_uuids(&all_uuids, search);
if (found < 0) {
fprintf(stderr,
"ERROR: %d while searching target device\n", 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) {
fprintf(stderr,
"ERROR: %d while mapping seed devices\n", ret);
return 1;
}
list_for_each_entry(fs_devices, &all_uuids, list)
print_one_uuid(fs_devices);
if (search && !found)
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:
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>[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_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_filesystem_df, cmd_filesystem_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 },
{ "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);
}