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btrfs-progs/cmds-filesystem.c

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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License v2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
#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 "kerncompat.h"
#include "ctree.h"
#include "ioctl.h"
#include "utils.h"
#include "volumes.h"
#include "version.h"
#include "commands.h"
#include "btrfslabel.h"
static const char * const filesystem_cmd_group_usage[] = {
"btrfs filesystem [<group>] <command> [<args>]",
NULL
};
static const char * const cmd_df_usage[] = {
"btrfs filesystem df <path>",
"Show space usage information for a mount point",
NULL
};
static int cmd_df(int argc, char **argv)
{
struct btrfs_ioctl_space_args *sargs, *sargs_orig;
u64 count = 0, i;
int ret;
int fd;
int e;
char *path;
if (check_argc_exact(argc, 2))
usage(cmd_df_usage);
path = argv[1];
fd = open_file_or_dir(path);
if (fd < 0) {
fprintf(stderr, "ERROR: can't access to '%s'\n", path);
return 12;
}
sargs_orig = 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 on '%s' - %s\n",
path, strerror(e));
close(fd);
free(sargs);
return ret;
}
if (!sargs->total_spaces) {
close(fd);
free(sargs);
return 0;
}
count = sargs->total_spaces;
sargs = realloc(sargs, sizeof(struct btrfs_ioctl_space_args) +
(count * sizeof(struct btrfs_ioctl_space_info)));
if (!sargs) {
close(fd);
free(sargs_orig);
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: couldn't get space info on '%s' - %s\n",
path, strerror(e));
close(fd);
free(sargs);
return ret;
}
for (i = 0; i < sargs->total_spaces; i++) {
char description[80];
char *total_bytes;
char *used_bytes;
int written = 0;
u64 flags = sargs->spaces[i].flags;
memset(description, 0, 80);
if (flags & BTRFS_BLOCK_GROUP_DATA) {
if (flags & BTRFS_BLOCK_GROUP_METADATA) {
snprintf(description, 14, "%s",
"Data+Metadata");
written += 13;
} else {
snprintf(description, 5, "%s", "Data");
written += 4;
}
} else if (flags & BTRFS_BLOCK_GROUP_SYSTEM) {
snprintf(description, 7, "%s", "System");
written += 6;
} else if (flags & BTRFS_BLOCK_GROUP_METADATA) {
snprintf(description, 9, "%s", "Metadata");
written += 8;
}
if (flags & BTRFS_BLOCK_GROUP_RAID0) {
snprintf(description+written, 8, "%s", ", RAID0");
written += 7;
} else if (flags & BTRFS_BLOCK_GROUP_RAID1) {
snprintf(description+written, 8, "%s", ", RAID1");
written += 7;
} else if (flags & BTRFS_BLOCK_GROUP_DUP) {
snprintf(description+written, 6, "%s", ", DUP");
written += 5;
} else if (flags & BTRFS_BLOCK_GROUP_RAID10) {
snprintf(description+written, 9, "%s", ", RAID10");
written += 8;
}
total_bytes = pretty_sizes(sargs->spaces[i].total_bytes);
used_bytes = pretty_sizes(sargs->spaces[i].used_bytes);
printf("%s: total=%s, used=%s\n", description, total_bytes,
used_bytes);
}
close(fd);
free(sargs);
return 0;
}
static int uuid_search(struct btrfs_fs_devices *fs_devices, char *search)
{
char uuidbuf[37];
struct list_head *cur;
struct btrfs_device *device;
int search_len = strlen(search);
search_len = min(search_len, 37);
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;
}
static void print_one_uuid(struct btrfs_fs_devices *fs_devices)
{
char uuidbuf[37];
struct list_head *cur;
struct btrfs_device *device;
char *super_bytes_used;
u64 devs_found = 0;
u64 total;
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 ");
super_bytes_used = pretty_sizes(device->super_bytes_used);
total = device->total_devs;
printf(" uuid: %s\n\tTotal devices %llu FS bytes used %s\n", uuidbuf,
(unsigned long long)total, super_bytes_used);
free(super_bytes_used);
list_for_each(cur, &fs_devices->devices) {
char *total_bytes;
char *bytes_used;
device = list_entry(cur, struct btrfs_device, dev_list);
total_bytes = pretty_sizes(device->total_bytes);
bytes_used = pretty_sizes(device->bytes_used);
printf("\tdevid %4llu size %s used %s path %s\n",
(unsigned long long)device->devid,
total_bytes, bytes_used, device->name);
free(total_bytes);
free(bytes_used);
devs_found++;
}
if (devs_found < total) {
printf("\t*** Some devices missing\n");
}
printf("\n");
}
static const char * const cmd_show_usage[] = {
"btrfs filesystem show [--all-devices] [<uuid>|<label>]",
"Show the structure of a filesystem",
"If no argument is given, structure of all present filesystems is shown.",
NULL
};
static int cmd_show(int argc, char **argv)
{
struct list_head *all_uuids;
struct btrfs_fs_devices *fs_devices;
struct list_head *cur_uuid;
char *search = 0;
int ret;
int checklist = 1;
int searchstart = 1;
if( argc > 1 && !strcmp(argv[1],"--all-devices")){
checklist = 0;
searchstart += 1;
}
if (check_argc_max(argc, searchstart + 1))
usage(cmd_show_usage);
if(checklist)
ret = btrfs_scan_block_devices(0);
else
ret = btrfs_scan_one_dir("/dev", 0);
if (ret){
fprintf(stderr, "ERROR: error %d while scanning\n", ret);
return 18;
}
if(searchstart < argc)
search = argv[searchstart];
all_uuids = btrfs_scanned_uuids();
list_for_each(cur_uuid, all_uuids) {
fs_devices = list_entry(cur_uuid, struct btrfs_fs_devices,
list);
if (search && uuid_search(fs_devices, search) == 0)
continue;
print_one_uuid(fs_devices);
}
printf("%s\n", BTRFS_BUILD_VERSION);
return 0;
}
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;
if (check_argc_exact(argc, 2))
usage(cmd_sync_usage);
path = argv[1];
fd = open_file_or_dir(path);
if (fd < 0) {
fprintf(stderr, "ERROR: can't access to '%s'\n", path);
return 12;
}
printf("FSSync '%s'\n", path);
res = ioctl(fd, BTRFS_IOC_SYNC);
e = errno;
close(fd);
if( res < 0 ){
fprintf(stderr, "ERROR: unable to fs-syncing '%s' - %s\n",
path, strerror(e));
return 16;
}
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",
"-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 cmd_defrag(int argc, char **argv)
{
int fd;
int flush = 0;
u64 start = 0;
u64 len = (u64)-1;
u32 thresh = 0;
int i;
int errors = 0;
int ret = 0;
int verbose = 0;
int fancy_ioctl = 0;
struct btrfs_ioctl_defrag_range_args range;
int e=0;
int compress_type = BTRFS_COMPRESS_NONE;
optind = 1;
while(1) {
int c = getopt(argc, argv, "vc::fs:l:t:");
if (c < 0)
break;
switch(c) {
case 'c':
compress_type = BTRFS_COMPRESS_ZLIB;
if (optarg)
compress_type = parse_compress_type(optarg);
fancy_ioctl = 1;
break;
case 'f':
flush = 1;
fancy_ioctl = 1;
break;
case 'v':
verbose = 1;
break;
case 's':
start = parse_size(optarg);
fancy_ioctl = 1;
break;
case 'l':
len = parse_size(optarg);
fancy_ioctl = 1;
break;
case 't':
thresh = parse_size(optarg);
fancy_ioctl = 1;
break;
default:
usage(cmd_defrag_usage);
}
}
if (check_argc_min(argc - optind, 1))
usage(cmd_defrag_usage);
memset(&range, 0, sizeof(range));
range.start = start;
range.len = len;
range.extent_thresh = thresh;
if (compress_type) {
range.flags |= BTRFS_DEFRAG_RANGE_COMPRESS;
range.compress_type = compress_type;
}
if (flush)
range.flags |= BTRFS_DEFRAG_RANGE_START_IO;
for (i = optind; i < argc; i++) {
if (verbose)
printf("%s\n", argv[i]);
fd = open_file_or_dir(argv[i]);
if (fd < 0) {
fprintf(stderr, "failed to open %s\n", argv[i]);
perror("open:");
errors++;
continue;
}
if (!fancy_ioctl) {
ret = ioctl(fd, BTRFS_IOC_DEFRAG, NULL);
e=errno;
} else {
ret = ioctl(fd, BTRFS_IOC_DEFRAG_RANGE, &range);
if (ret && errno == ENOTTY) {
fprintf(stderr, "ERROR: defrag range ioctl not "
"supported in this kernel, please try "
"without any options.\n");
errors++;
close(fd);
break;
}
}
if (ret) {
fprintf(stderr, "ERROR: defrag failed on %s - %s\n",
argv[i], strerror(e));
errors++;
}
close(fd);
}
if (verbose)
printf("%s\n", BTRFS_BUILD_VERSION);
if (errors) {
fprintf(stderr, "total %d failures\n", errors);
exit(1);
}
return errors + 20;
}
static const char * const cmd_resize_usage[] = {
"btrfs filesystem resize [devid:][+/-]<newsize>[gkm]|[devid:]max <path>",
"Resize a filesystem",
"If 'max' is passed, the filesystem will occupy all available space",
"on the device 'devid'.",
NULL
};
static int cmd_resize(int argc, char **argv)
{
struct btrfs_ioctl_vol_args args;
int fd, res, len, e;
char *amount, *path;
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 14;
}
fd = open_file_or_dir(path);
if (fd < 0) {
fprintf(stderr, "ERROR: can't access to '%s'\n", path);
return 12;
}
printf("Resize '%s' of '%s'\n", path, amount);
strncpy(args.name, amount, BTRFS_PATH_NAME_MAX);
args.name[BTRFS_PATH_NAME_MAX-1] = 0;
res = ioctl(fd, BTRFS_IOC_RESIZE, &args);
e = errno;
close(fd);
if( res < 0 ){
fprintf(stderr, "ERROR: unable to resize '%s' - %s\n",
path, strerror(e));
return 30;
}
return 0;
}
static const char * const cmd_label_usage[] = {
"btrfs filesystem label <device> [<newlabel>]",
"Get or change the label of an unmounted 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
return get_label(argv[1]);
}
const struct cmd_group filesystem_cmd_group = {
filesystem_cmd_group_usage, NULL, {
{ "df", cmd_df, cmd_df_usage, NULL, 0 },
{ "show", cmd_show, cmd_show_usage, NULL, 0 },
{ "sync", cmd_sync, cmd_sync_usage, NULL, 0 },
{ "defragment", cmd_defrag, cmd_defrag_usage, NULL, 0 },
{ "balance", cmd_balance, NULL, &balance_cmd_group, 1 },
{ "resize", cmd_resize, cmd_resize_usage, NULL, 0 },
{ "label", cmd_label, cmd_label_usage, NULL, 0 },
{ 0, 0, 0, 0, 0 },
}
};
int cmd_filesystem(int argc, char **argv)
{
return handle_command_group(&filesystem_cmd_group, argc, argv);
}
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