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/*
* lsblk(8) - list block devices
*
* Copyright (C) 2010,2011 Red Hat, Inc. All rights reserved.
* Written by Milan Broz <mbroz@redhat.com>
* Karel Zak <kzak@redhat.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it would 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdio.h>
#include <errno.h>
#include <getopt.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdint.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <fcntl.h>
#include <string.h>
#include <sys/ioctl.h>
#include <inttypes.h>
#include <stdarg.h>
#include <locale.h>
#include <pwd.h>
#include <grp.h>
#include <ctype.h>
#include <blkid.h>
#include <libmount.h>
#ifdef HAVE_LIBUDEV
#include <libudev.h>
#endif
#include <assert.h>
#include "c.h"
#include "pathnames.h"
#include "blkdev.h"
#include "canonicalize.h"
#include "nls.h"
#include "tt.h"
#include "xalloc.h"
#include "strutils.h"
#include "at.h"
#include "sysfs.h"
#include "closestream.h"
#include "mangle.h"
#include "optutils.h"
/* column IDs */
enum {
COL_NAME = 0,
COL_KNAME,
COL_MAJMIN,
COL_FSTYPE,
COL_TARGET,
COL_LABEL,
COL_UUID,
COL_PARTLABEL,
COL_PARTUUID,
COL_RA,
COL_RO,
COL_RM,
COL_MODEL,
COL_SIZE,
COL_STATE,
COL_OWNER,
COL_GROUP,
COL_MODE,
COL_ALIOFF,
COL_MINIO,
COL_OPTIO,
COL_PHYSEC,
COL_LOGSEC,
COL_ROTA,
COL_SCHED,
COL_RQ_SIZE,
COL_TYPE,
COL_DALIGN,
COL_DGRAN,
COL_DMAX,
COL_DZERO,
COL_WWN,
COL_RAND,
};
/* column names */
struct colinfo {
const char *name; /* header */
double whint; /* width hint (N < 1 is in percent of termwidth) */
int flags; /* TT_FL_* */
const char *help;
};
/* columns descriptions */
static struct colinfo infos[] = {
[COL_NAME] = { "NAME", 0.25, TT_FL_TREE | TT_FL_NOEXTREMES, N_("device name") },
[COL_KNAME] = { "KNAME", 0.3, 0, N_("internal kernel device name") },
[COL_MAJMIN] = { "MAJ:MIN", 6, 0, N_("major:minor device number") },
[COL_FSTYPE] = { "FSTYPE", 0.1, TT_FL_TRUNC, N_("filesystem type") },
[COL_TARGET] = { "MOUNTPOINT", 0.10, TT_FL_TRUNC, N_("where the device is mounted") },
[COL_LABEL] = { "LABEL", 0.1, 0, N_("filesystem LABEL") },
[COL_UUID] = { "UUID", 36, 0, N_("filesystem UUID") },
[COL_PARTLABEL] = { "PARTLABEL", 0.1, 0, N_("partition LABEL") },
[COL_PARTUUID] = { "PARTUUID", 36, 0, N_("partition UUID") },
[COL_RA] = { "RA", 4, TT_FL_RIGHT, N_("read-ahead of the device") },
[COL_RO] = { "RO", 1, TT_FL_RIGHT, N_("read-only device") },
[COL_RM] = { "RM", 1, TT_FL_RIGHT, N_("removable device") },
[COL_ROTA] = { "ROTA", 1, TT_FL_RIGHT, N_("rotational device") },
[COL_RAND] = { "RAND", 1, TT_FL_RIGHT, N_("adds randomness") },
[COL_MODEL] = { "MODEL", 0.1, TT_FL_TRUNC, N_("device identifier") },
[COL_SIZE] = { "SIZE", 5, TT_FL_RIGHT, N_("size of the device") },
[COL_STATE] = { "STATE", 7, TT_FL_TRUNC, N_("state of the device") },
[COL_OWNER] = { "OWNER", 0.1, TT_FL_TRUNC, N_("user name"), },
[COL_GROUP] = { "GROUP", 0.1, TT_FL_TRUNC, N_("group name") },
[COL_MODE] = { "MODE", 10, 0, N_("device node permissions") },
[COL_ALIOFF] = { "ALIGNMENT", 6, TT_FL_RIGHT, N_("alignment offset") },
[COL_MINIO] = { "MIN-IO", 6, TT_FL_RIGHT, N_("minimum I/O size") },
[COL_OPTIO] = { "OPT-IO", 6, TT_FL_RIGHT, N_("optimal I/O size") },
[COL_PHYSEC] = { "PHY-SEC", 7, TT_FL_RIGHT, N_("physical sector size") },
[COL_LOGSEC] = { "LOG-SEC", 7, TT_FL_RIGHT, N_("logical sector size") },
[COL_SCHED] = { "SCHED", 0.1, 0, N_("I/O scheduler name") },
[COL_RQ_SIZE]= { "RQ-SIZE", 5, TT_FL_RIGHT, N_("request queue size") },
[COL_TYPE] = { "TYPE", 4, 0, N_("device type") },
[COL_DALIGN] = { "DISC-ALN", 6, TT_FL_RIGHT, N_("discard alignment offset") },
[COL_DGRAN] = { "DISC-GRAN", 6, TT_FL_RIGHT, N_("discard granularity") },
[COL_DMAX] = { "DISC-MAX", 6, TT_FL_RIGHT, N_("discard max bytes") },
[COL_DZERO] = { "DISC-ZERO", 1, TT_FL_RIGHT, N_("discard zeroes data") },
[COL_WWN] = { "WWN", 18, 0, N_("unique storage identifier") },
};
struct lsblk {
struct tt *tt; /* output table */
unsigned int all_devices:1; /* print all devices, including empty */
unsigned int bytes:1; /* print SIZE in bytes */
unsigned int inverse:1; /* print inverse dependencies */
unsigned int nodeps:1; /* don't print slaves/holders */
};
struct lsblk *lsblk; /* global handler */
#define NCOLS ARRAY_SIZE(infos)
static int columns[NCOLS];/* enabled columns */
static int ncolumns; /* number of enabled columns */
static int excludes[256];
static size_t nexcludes;
static int includes[256];
static size_t nincludes;
static struct libmnt_table *mtab, *swaps;
static struct libmnt_cache *mntcache;
struct blkdev_cxt {
struct blkdev_cxt *parent;
struct tt_line *tt_line;
struct stat st;
char *name; /* kernel name in /sys/block */
char *dm_name; /* DM name (dm/block) */
char *filename; /* path to device node */
struct sysfs_cxt sysfs;
int partition; /* is partition? TRUE/FALSE */
int probed; /* already probed */
char *fstype; /* detected fs, NULL or "?" if cannot detect */
char *uuid; /* filesystem UUID (or stack uuid) */
char *label; /* filesystem label */
char *partuuid; /* partition UUID */
char *partlabel; /* partiton label */
char *wwn; /* storage WWN */
int npartitions; /* # of partitions this device has */
int nholders; /* # of devices mapped directly to this device
* /sys/block/.../holders */
int nslaves; /* # of devices this device maps to */
int maj, min; /* devno */
int discard; /* supports discard */
uint64_t size; /* device size */
};
static int is_maj_excluded(int maj)
{
size_t i;
assert(ARRAY_SIZE(excludes) > nexcludes);
if (!nexcludes)
return 0; /* filter not enabled, device not exluded */
for (i = 0; i < nexcludes; i++)
if (excludes[i] == maj)
return 1;
return 0;
}
static int is_maj_included(int maj)
{
size_t i;
assert(ARRAY_SIZE(includes) > nincludes);
if (!nincludes)
return 1; /* filter not enabled, device is included */
for (i = 0; i < nincludes; i++)
if (includes[i] == maj)
return 1;
return 0;
}
/* array with IDs of enabled columns */
static int get_column_id(int num)
{
assert(ARRAY_SIZE(columns) == NCOLS);
assert(num < ncolumns);
assert(columns[num] < (int) NCOLS);
return columns[num];
}
static struct colinfo *get_column_info(int num)
{
return &infos[ get_column_id(num) ];
}
static int column_name_to_id(const char *name, size_t namesz)
{
size_t i;
for (i = 0; i < NCOLS; i++) {
const char *cn = infos[i].name;
if (!strncasecmp(name, cn, namesz) && !*(cn + namesz))
return i;
}
warnx(_("unknown column: %s"), name);
return -1;
}
static void reset_blkdev_cxt(struct blkdev_cxt *cxt)
{
if (!cxt)
return;
free(cxt->name);
free(cxt->dm_name);
free(cxt->filename);
free(cxt->fstype);
free(cxt->uuid);
free(cxt->label);
free(cxt->partuuid);
free(cxt->partlabel);
free(cxt->wwn);
sysfs_deinit(&cxt->sysfs);
memset(cxt, 0, sizeof(*cxt));
}
static int is_dm(const char *name)
{
return strncmp(name, "dm-", 3) ? 0 : 1;
}
static struct dirent *xreaddir(DIR *dp)
{
struct dirent *d;
assert(dp);
while ((d = readdir(dp))) {
if (!strcmp(d->d_name, ".") ||
!strcmp(d->d_name, ".."))
continue;
/* blacklist here? */
break;
}
return d;
}
static char *get_device_path(struct blkdev_cxt *cxt)
{
char path[PATH_MAX];
assert(cxt);
assert(cxt->name);
if (is_dm(cxt->name))
return canonicalize_dm_name(cxt->name);
snprintf(path, sizeof(path), "/dev/%s", cxt->name);
return xstrdup(path);
}
static int is_active_swap(const char *filename)
{
if (!swaps) {
swaps = mnt_new_table();
if (!swaps)
return 0;
if (!mntcache)
mntcache = mnt_new_cache();
mnt_table_set_cache(swaps, mntcache);
mnt_table_parse_swaps(swaps, NULL);
}
return mnt_table_find_srcpath(swaps, filename, MNT_ITER_BACKWARD) != 0;
}
static char *get_device_mountpoint(struct blkdev_cxt *cxt)
{
struct libmnt_fs *fs;
const char *fsroot;
assert(cxt);
assert(cxt->filename);
if (!mtab) {
mtab = mnt_new_table();
if (!mtab)
return NULL;
if (!mntcache)
mntcache = mnt_new_cache();
mnt_table_set_cache(mtab, mntcache);
mnt_table_parse_mtab(mtab, NULL);
}
/* try /etc/mtab or /proc/self/mountinfo */
fs = mnt_table_find_srcpath(mtab, cxt->filename, MNT_ITER_BACKWARD);
if (!fs)
return is_active_swap(cxt->filename) ? xstrdup("[SWAP]") : NULL;
/* found */
fsroot = mnt_fs_get_root(fs);
if (fsroot && strcmp(fsroot, "/") != 0) {
/* hmm.. we found bind mount or btrfs subvolume, let's try to
* get real FS root mountpoint */
struct libmnt_fs *rfs;
struct libmnt_iter *itr = mnt_new_iter(MNT_ITER_BACKWARD);
mnt_table_set_iter(mtab, itr, fs);
while (mnt_table_next_fs(mtab, itr, &rfs) == 0) {
fsroot = mnt_fs_get_root(rfs);
if ((!fsroot || strcmp(fsroot, "/") == 0)
&& mnt_fs_match_source(rfs, cxt->filename, mntcache)) {
fs = rfs;
break;
}
}
mnt_free_iter(itr);
}
return xstrdup(mnt_fs_get_target(fs));
}
#ifndef HAVE_LIBUDEV
static int get_udev_properties(struct blkdev_cxt *cxt
__attribute__((__unused__)))
{
return -1;
}
#else
static int get_udev_properties(struct blkdev_cxt *cxt)
{
struct udev *udev;
struct udev_device *dev;
if (cxt->probed)
return 0; /* already done */
udev = udev_new();
if (!udev)
return -1;
dev = udev_device_new_from_subsystem_sysname(udev, "block", cxt->name);
if (dev) {
const char *data;
if ((data = udev_device_get_property_value(dev, "ID_FS_LABEL_ENC"))) {
cxt->label = xstrdup(data);
unhexmangle_string(cxt->label);
}
if ((data = udev_device_get_property_value(dev, "ID_FS_UUID_ENC"))) {
cxt->uuid = xstrdup(data);
unhexmangle_string(cxt->uuid);
}
if ((data = udev_device_get_property_value(dev, "ID_PART_ENTRY_NAME"))) {
cxt->partlabel = xstrdup(data);
unhexmangle_string(cxt->partlabel);
}
if ((data = udev_device_get_property_value(dev, "ID_FS_TYPE")))
cxt->fstype = xstrdup(data);
if ((data = udev_device_get_property_value(dev, "ID_PART_ENTRY_UUID")))
cxt->partuuid = xstrdup(data);
if ((data = udev_device_get_property_value(dev, "ID_WWN")))
cxt->wwn = xstrdup(data);
udev_device_unref(dev);
cxt->probed = 1;
}
udev_unref(udev);
return cxt->probed == 1 ? 0 : -1;
}
#endif /* HAVE_LIBUDEV */
static void probe_device(struct blkdev_cxt *cxt)
{
blkid_probe pr = NULL;
if (cxt->probed)
return;
if (!cxt->size)
return;
/* try udev DB */
if (get_udev_properties(cxt) == 0)
return; /* success */
cxt->probed = 1;
/* try libblkid (fallback) */
if (getuid() != 0)
return; /* no permissions to read from the device */
pr = blkid_new_probe_from_filename(cxt->filename);
if (!pr)
return;
blkid_probe_enable_superblocks(pr, 1);
blkid_probe_set_superblocks_flags(pr, BLKID_SUBLKS_LABEL |
BLKID_SUBLKS_UUID |
BLKID_SUBLKS_TYPE);
blkid_probe_enable_partitions(pr, 1);
blkid_probe_set_partitions_flags(pr, BLKID_PARTS_ENTRY_DETAILS);
if (!blkid_do_safeprobe(pr)) {
const char *data = NULL;
if (!blkid_probe_lookup_value(pr, "TYPE", &data, NULL))
cxt->fstype = xstrdup(data);
if (!blkid_probe_lookup_value(pr, "UUID", &data, NULL))
cxt->uuid = xstrdup(data);
if (!blkid_probe_lookup_value(pr, "LABEL", &data, NULL))
cxt->label = xstrdup(data);
if (!blkid_probe_lookup_value(pr, "PART_ENTRY_UUID", &data, NULL))
cxt->partuuid = xstrdup(data);
if (!blkid_probe_lookup_value(pr, "PART_ENTRY_NAME", &data, NULL))
cxt->partlabel = xstrdup(data);
}
blkid_free_probe(pr);
return;
}
static int is_readonly_device(struct blkdev_cxt *cxt)
{
int fd, ro = 0;
if (sysfs_scanf(&cxt->sysfs, "ro", "%d", &ro) == 1)
return ro;
/* fallback if "ro" attribute does not exist */
fd = open(cxt->filename, O_RDONLY);
if (fd != -1) {
if (ioctl(fd, BLKROGET, &ro) != 0)
ro = 0;
close(fd);
}
return ro;
}
static char *get_scheduler(struct blkdev_cxt *cxt)
{
char *str = sysfs_strdup(&cxt->sysfs, "queue/scheduler");
char *p, *res = NULL;
if (!str)
return NULL;
p = strchr(str, '[');
if (p) {
res = p + 1;
p = strchr(res, ']');
if (p) {
*p = '\0';
res = xstrdup(res);
} else
res = NULL;
}
free(str);
return res;
}
static char *get_type(struct blkdev_cxt *cxt)
{
char *res = NULL, *p;
if (is_dm(cxt->name)) {
char *dm_uuid = sysfs_strdup(&cxt->sysfs, "dm/uuid");
/* The DM_UUID prefix should be set to subsystem owning
* the device - LVM, CRYPT, DMRAID, MPATH, PART */
if (dm_uuid) {
char *tmp = dm_uuid;
char *dm_uuid_prefix = strsep(&tmp, "-");
if (dm_uuid_prefix) {
/* kpartx hack to remove partition number */
if (strncasecmp(dm_uuid_prefix, "part", 4) == 0)
dm_uuid_prefix[4] = '\0';
res = xstrdup(dm_uuid_prefix);
}
}
free(dm_uuid);
if (!res)
/* No UUID or no prefix - just mark it as DM device */
res = xstrdup("dm");
} else if (!strncmp(cxt->name, "loop", 4)) {
res = xstrdup("loop");
} else if (!strncmp(cxt->name, "md", 2)) {
char *md_level = sysfs_strdup(&cxt->sysfs, "md/level");
res = md_level ? md_level : xstrdup("md");
} else {
const char *type = NULL;
int x = 0;
if (!sysfs_read_int(&cxt->sysfs, "device/type", &x))
type = blkdev_scsi_type_to_name(x);
if (!type)
type = cxt->partition ? "part" : "disk";
res = xstrdup(type);
}
for (p = res; p && *p; p++)
*p = tolower((unsigned char) *p);
return res;
}
#define is_parsable(_l) (((_l)->tt->flags & TT_FL_RAW) || \
((_l)->tt->flags & TT_FL_EXPORT))
static void set_tt_data(struct blkdev_cxt *cxt, int col, int id, struct tt_line *ln)
{
char buf[1024];
char *p = NULL;
int st_rc = 0;
if (!cxt->st.st_rdev && (id == COL_OWNER || id == COL_GROUP ||
id == COL_MODE))
st_rc = stat(cxt->filename, &cxt->st);
switch(id) {
case COL_NAME:
if (cxt->dm_name) {
if (is_parsable(lsblk))
tt_line_set_data(ln, col, xstrdup(cxt->dm_name));
else {
snprintf(buf, sizeof(buf), "%s (%s)",
cxt->dm_name, cxt->name);
tt_line_set_data(ln, col, xstrdup(buf));
}
break;
}
case COL_KNAME:
tt_line_set_data(ln, col, xstrdup(cxt->name));
break;
case COL_OWNER:
{
struct passwd *pw = st_rc ? NULL : getpwuid(cxt->st.st_uid);
if (pw)
tt_line_set_data(ln, col, xstrdup(pw->pw_name));
break;
}
case COL_GROUP:
{
struct group *gr = st_rc ? NULL : getgrgid(cxt->st.st_gid);
if (gr)
tt_line_set_data(ln, col, xstrdup(gr->gr_name));
break;
}
case COL_MODE:
{
char md[11];
if (!st_rc) {
strmode(cxt->st.st_mode, md);
tt_line_set_data(ln, col, xstrdup(md));
}
break;
}
case COL_MAJMIN:
if (is_parsable(lsblk))
snprintf(buf, sizeof(buf), "%u:%u", cxt->maj, cxt->min);
else
snprintf(buf, sizeof(buf), "%3u:%-3u", cxt->maj, cxt->min);
tt_line_set_data(ln, col, xstrdup(buf));
break;
case COL_FSTYPE:
probe_device(cxt);
if (cxt->fstype)
tt_line_set_data(ln, col, xstrdup(cxt->fstype));
break;
case COL_TARGET:
if (!(cxt->nholders + cxt->npartitions)) {
if ((p = get_device_mountpoint(cxt)))
tt_line_set_data(ln, col, p);
}
break;
case COL_LABEL:
probe_device(cxt);
if (!cxt->label)
break;
tt_line_set_data(ln, col, xstrdup(cxt->label));
break;
case COL_UUID:
probe_device(cxt);
if (cxt->uuid)
tt_line_set_data(ln, col, xstrdup(cxt->uuid));
break;
case COL_PARTLABEL:
probe_device(cxt);
if (!cxt->partlabel)
break;
tt_line_set_data(ln, col, xstrdup(cxt->partlabel));
break;
case COL_PARTUUID:
probe_device(cxt);
if (cxt->uuid)
tt_line_set_data(ln, col, xstrdup(cxt->partuuid));
break;
case COL_WWN:
get_udev_properties(cxt);
if (cxt->wwn)
tt_line_set_data(ln, col, xstrdup(cxt->wwn));
break;
case COL_RA:
p = sysfs_strdup(&cxt->sysfs, "queue/read_ahead_kb");
if (p)
tt_line_set_data(ln, col, p);
break;
case COL_RO:
tt_line_set_data(ln, col, is_readonly_device(cxt) ?
xstrdup("1") : xstrdup("0"));
break;
case COL_RM:
p = sysfs_strdup(&cxt->sysfs, "removable");
if (!p && cxt->sysfs.parent)
p = sysfs_strdup(cxt->sysfs.parent, "removable");
if (p)
tt_line_set_data(ln, col, p);
break;
case COL_ROTA:
p = sysfs_strdup(&cxt->sysfs, "queue/rotational");
if (p)
tt_line_set_data(ln, col, p);
break;
case COL_RAND:
p = sysfs_strdup(&cxt->sysfs, "queue/add_random");
if (p)
tt_line_set_data(ln, col, p);
break;
case COL_MODEL:
if (!cxt->partition && cxt->nslaves == 0) {
p = sysfs_strdup(&cxt->sysfs, "device/model");
if (p)
tt_line_set_data(ln, col, p);
}
break;
case COL_SIZE:
if (cxt->size) {
if (lsblk->bytes) {
if (xasprintf(&p, "%jd", cxt->size) < 0)
p = NULL;
} else
p = size_to_human_string(SIZE_SUFFIX_1LETTER, cxt->size);
if (p)
tt_line_set_data(ln, col, p);
}
break;
case COL_STATE:
if (!cxt->partition && !cxt->dm_name) {
p = sysfs_strdup(&cxt->sysfs, "device/state");
} else if (cxt->dm_name) {
int x = 0;
if (sysfs_read_int(&cxt->sysfs, "dm/suspended", &x) == 0)
p = x ? xstrdup("suspended") : xstrdup("running");
}
if (p)
tt_line_set_data(ln, col, p);
break;
case COL_ALIOFF:
p = sysfs_strdup(&cxt->sysfs, "alignment_offset");
if (p)
tt_line_set_data(ln, col, p);
break;
case COL_MINIO:
p = sysfs_strdup(&cxt->sysfs, "queue/minimum_io_size");
if (p)
tt_line_set_data(ln, col, p);
break;
case COL_OPTIO:
p = sysfs_strdup(&cxt->sysfs, "queue/optimal_io_size");
if (p)
tt_line_set_data(ln, col, p);
break;
case COL_PHYSEC:
p = sysfs_strdup(&cxt->sysfs, "queue/physical_block_size");
if (p)
tt_line_set_data(ln, col, p);
break;
case COL_LOGSEC:
p = sysfs_strdup(&cxt->sysfs, "queue/logical_block_size");
if (p)
tt_line_set_data(ln, col, p);
break;
case COL_SCHED:
p = get_scheduler(cxt);
if (p)
tt_line_set_data(ln, col, p);
break;
case COL_RQ_SIZE:
p = sysfs_strdup(&cxt->sysfs, "queue/nr_requests");
if (p)
tt_line_set_data(ln, col, p);
break;
case COL_TYPE:
p = get_type(cxt);
if (p)
tt_line_set_data(ln, col, p);
break;
case COL_DALIGN:
p = sysfs_strdup(&cxt->sysfs, "discard_alignment");
if (cxt->discard && p)
tt_line_set_data(ln, col, p);
else
tt_line_set_data(ln, col, "0");
break;
case COL_DGRAN:
if (lsblk->bytes)
p = sysfs_strdup(&cxt->sysfs, "queue/discard_granularity");
else {
uint64_t x;
if (sysfs_read_u64(&cxt->sysfs,
"queue/discard_granularity", &x) == 0)
p = size_to_human_string(SIZE_SUFFIX_1LETTER, x);
}
if (p)
tt_line_set_data(ln, col, p);
break;
case COL_DMAX:
if (lsblk->bytes)
p = sysfs_strdup(&cxt->sysfs, "queue/discard_max_bytes");
else {
uint64_t x;
if (sysfs_read_u64(&cxt->sysfs,
"queue/discard_max_bytes", &x) == 0)
p = size_to_human_string(SIZE_SUFFIX_1LETTER, x);
}
if (p)
tt_line_set_data(ln, col, p);
break;
case COL_DZERO:
p = sysfs_strdup(&cxt->sysfs, "queue/discard_zeroes_data");
if (cxt->discard && p)
tt_line_set_data(ln, col, p);
else
tt_line_set_data(ln, col, "0");
break;
};
}
static void print_device(struct blkdev_cxt *cxt, struct tt_line *tt_parent)
{
int i;
cxt->tt_line = tt_add_line(lsblk->tt, tt_parent);
for (i = 0; i < ncolumns; i++)
set_tt_data(cxt, i, get_column_id(i), cxt->tt_line);
}
static int set_cxt(struct blkdev_cxt *cxt,
struct blkdev_cxt *parent,
struct blkdev_cxt *wholedisk,
const char *name)
{
dev_t devno;
cxt->parent = parent;
cxt->name = xstrdup(name);
cxt->partition = wholedisk != NULL;
cxt->filename = get_device_path(cxt);
if (!cxt->filename) {
warnx(_("%s: failed to get device path"), name);
return -1;
}
devno = sysfs_devname_to_devno(name, wholedisk ? wholedisk->name : NULL);
if (!devno) {
warnx(_("%s: unknown device name"), name);
return -1;
}
if (lsblk->inverse) {
if (sysfs_init(&cxt->sysfs, devno, wholedisk ? &wholedisk->sysfs : NULL)) {
warnx(_("%s: failed to initialize sysfs handler"), name);
return -1;
}
if (parent)
parent->sysfs.parent = &cxt->sysfs;
} else {
if (sysfs_init(&cxt->sysfs, devno, parent ? &parent->sysfs : NULL)) {
warnx(_("%s: failed to initialize sysfs handler"), name);
return -1;
}
}
cxt->maj = major(devno);
cxt->min = minor(devno);
cxt->size = 0;
if (sysfs_read_u64(&cxt->sysfs, "size", &cxt->size) == 0) /* in sectors */
cxt->size <<= 9; /* in bytes */
sysfs_read_int(&cxt->sysfs, "queue/discard_granularity", &cxt->discard);
/* Ignore devices of zero size */
if (!lsblk->all_devices && cxt->size == 0)
return -1;
if (is_dm(name)) {
cxt->dm_name = sysfs_strdup(&cxt->sysfs, "dm/name");
if (!cxt->dm_name) {
warnx(_("%s: failed to get dm name"), name);
return -1;
}
}
cxt->npartitions = sysfs_count_partitions(&cxt->sysfs, name);
cxt->nholders = sysfs_count_dirents(&cxt->sysfs, "holders");
cxt->nslaves = sysfs_count_dirents(&cxt->sysfs, "slaves");
return 0;
}
static int process_blkdev(struct blkdev_cxt *cxt, struct blkdev_cxt *parent,
int do_partitions, const char *part_name);
/*
* List device partitions if any.
*/
static int list_partitions(struct blkdev_cxt *wholedisk_cxt, struct blkdev_cxt *parent_cxt,
const char *part_name)
{
DIR *dir;
struct dirent *d;
struct blkdev_cxt part_cxt = {};
int r = -1;
assert(wholedisk_cxt);
/*
* Do not process further if there are no partitions for
* this device or the device itself is a partition.
*/
if (!wholedisk_cxt->npartitions || wholedisk_cxt->partition)
return -1;
dir = sysfs_opendir(&wholedisk_cxt->sysfs, NULL);
if (!dir)
err(EXIT_FAILURE, _("failed to open device directory in sysfs"));
while ((d = xreaddir(dir))) {
/* Process particular partition only? */
if (part_name && strcmp(part_name, d->d_name))
continue;
if (!(sysfs_is_partition_dirent(dir, d, wholedisk_cxt->name)))
continue;
if (lsblk->inverse) {
/*
* <parent_cxt>
* `-<part_cxt>
* `-<wholedisk_cxt>
* `-...
*/
if (set_cxt(&part_cxt, parent_cxt, wholedisk_cxt, d->d_name))
goto next;
if (!parent_cxt && part_cxt.nholders)
goto next;
wholedisk_cxt->parent = &part_cxt;
print_device(&part_cxt, parent_cxt ? parent_cxt->tt_line : NULL);
if (!lsblk->nodeps)
process_blkdev(wholedisk_cxt, &part_cxt, 0, NULL);
} else {
/*
* <parent_cxt>
* `-<wholedisk_cxt>
* `-<part_cxt>
* `-...
*/
if (set_cxt(&part_cxt, wholedisk_cxt, wholedisk_cxt, d->d_name))
goto next;
/* Print whole disk only once */
if (r)
print_device(wholedisk_cxt, parent_cxt ? parent_cxt->tt_line : NULL);
if (!lsblk->nodeps)
process_blkdev(&part_cxt, wholedisk_cxt, 0, NULL);
}
next:
reset_blkdev_cxt(&part_cxt);
r = 0;
}
closedir(dir);
return r;
}
static int get_wholedisk_from_partition_dirent(DIR *dir, const char *dirname,
struct dirent *d, struct blkdev_cxt *cxt)
{
char path[PATH_MAX];
char *p;
int len;
if ((len = readlink_at(dirfd(dir), dirname,
d->d_name, path, sizeof(path))) < 0)
return 0;
path[len] = '\0';
/* The path ends with ".../<device>/<partition>" */
p = strrchr(path, '/');
if (!p)
return 0;
*p = '\0';
p = strrchr(path, '/');
if (!p)
return 0;
p++;
return set_cxt(cxt, NULL, NULL, p);
}
/*
* List device dependencies: partitions, holders (inverse = 0) or slaves (inverse = 1).
*/
static int list_deps(struct blkdev_cxt *cxt)
{
DIR *dir;
struct dirent *d;
struct blkdev_cxt dep = {};
char dirname[PATH_MAX];
const char *depname;
assert(cxt);
if (lsblk->nodeps)
return 0;
if (!(lsblk->inverse ? cxt->nslaves : cxt->nholders))
return 0;
depname = lsblk->inverse ? "slaves" : "holders";
dir = sysfs_opendir(&cxt->sysfs, depname);
if (!dir)
return 0;
snprintf(dirname, sizeof(dirname), "%s/%s", cxt->sysfs.dir_path, depname);
while ((d = xreaddir(dir))) {
/* Is the dependency a partition? */
if (sysfs_is_partition_dirent(dir, d, NULL)) {
if (!get_wholedisk_from_partition_dirent(dir, dirname, d, &dep))
process_blkdev(&dep, cxt, 1, d->d_name);
}
/* The dependency is a whole device. */
else if (!set_cxt(&dep, cxt, NULL, d->d_name))
process_blkdev(&dep, cxt, 1, NULL);
reset_blkdev_cxt(&dep);
}
closedir(dir);
return 0;
}
static int process_blkdev(struct blkdev_cxt *cxt, struct blkdev_cxt *parent,
int do_partitions, const char *part_name)
{
if (do_partitions && cxt->npartitions)
return list_partitions(cxt, parent, part_name);
print_device(cxt, parent ? parent->tt_line : NULL);
return list_deps(cxt);
}
/* Iterate devices in sysfs */
static int iterate_block_devices(void)
{
DIR *dir;
struct dirent *d;
struct blkdev_cxt cxt = {};
if (!(dir = opendir(_PATH_SYS_BLOCK)))
return EXIT_FAILURE;
while ((d = xreaddir(dir))) {
if (set_cxt(&cxt, NULL, NULL, d->d_name))
goto next;
if (is_maj_excluded(cxt.maj) || !is_maj_included(cxt.maj))
goto next;
/* Skip devices in the middle of dependency tree. */
if ((lsblk->inverse ? cxt.nholders : cxt.nslaves) > 0)
goto next;
process_blkdev(&cxt, NULL, 1, NULL);
next:
reset_blkdev_cxt(&cxt);
}
closedir(dir);
return EXIT_SUCCESS;
}
static char *devno_to_sysfs_name(dev_t devno, char *devname, char *buf, size_t buf_size)
{
char path[PATH_MAX];
ssize_t len;
if (!sysfs_devno_path(devno, path, sizeof(path))) {
warn(_("%s: failed to compose sysfs path"), devname);
return NULL;
}
len = readlink(path, buf, buf_size);
if (len < 0) {
warn(_("%s: failed to read link"), path);
return NULL;
}
buf[len] = '\0';
return xstrdup(strrchr(buf, '/') + 1);
}
static int process_one_device(char *devname)
{
struct blkdev_cxt parent = {}, cxt = {};
struct stat st;
char buf[PATH_MAX + 1], *name, *diskname = NULL;
dev_t disk = 0;
int real_part = 0;
int status = EXIT_FAILURE;
if (stat(devname, &st) || !S_ISBLK(st.st_mode)) {
warnx(_("%s: not a block device"), devname);
return EXIT_FAILURE;
}
if (!(name = devno_to_sysfs_name(st.st_rdev, devname, buf, PATH_MAX))) {
warn(_("%s: failed to get sysfs name"), devname);
return EXIT_FAILURE;
}
if (!strncmp(name, "dm-", 3)) {
/* dm mapping is never a real partition! */
real_part = 0;
} else {
if (blkid_devno_to_wholedisk(st.st_rdev, buf, sizeof(buf), &disk)) {
warn(_("%s: failed to get whole-disk device number"), devname);
return EXIT_FAILURE;
}
diskname = buf;
real_part = st.st_rdev != disk;
}
if (!real_part) {
/*
* Device is not a partition.
*/
if (set_cxt(&cxt, NULL, NULL, name))
goto leave;
process_blkdev(&cxt, NULL, !lsblk->inverse, NULL);
} else {
/*
* Partition, read sysfs name of the device.
*/
if (set_cxt(&parent, NULL, NULL, diskname))
goto leave;
if (set_cxt(&cxt, &parent, &parent, name))
goto leave;
if (lsblk->inverse)
process_blkdev(&parent, &cxt, 1, cxt.name);
else
process_blkdev(&cxt, &parent, 1, NULL);
}
status = EXIT_SUCCESS;
leave:
free(name);
reset_blkdev_cxt(&cxt);
if (real_part)
reset_blkdev_cxt(&parent);
return status;
}
static void parse_excludes(const char *str0)
{
const char *str = str0;
while (str && *str) {
char *end = NULL;
unsigned long n;
errno = 0;
n = strtoul(str, &end, 10);
if (end == str || (end && *end && *end != ','))
errx(EXIT_FAILURE, _("failed to parse list '%s'"), str0);
if (errno != 0 && (n == ULONG_MAX || n == 0))
err(EXIT_FAILURE, _("failed to parse list '%s'"), str0);
excludes[nexcludes++] = n;
if (nexcludes == ARRAY_SIZE(excludes))
/* TRANSLATORS: The standard value for %d is 256. */
errx(EXIT_FAILURE, _("the list of excluded devices is "
"too large (limit is %d devices)"),
(int)ARRAY_SIZE(excludes));
str = end && *end ? end + 1 : NULL;
}
}
static void parse_includes(const char *str0)
{
const char *str = str0;
while (str && *str) {
char *end = NULL;
unsigned long n;
errno = 0;
n = strtoul(str, &end, 10);
if (end == str || (end && *end && *end != ','))
errx(EXIT_FAILURE, _("failed to parse list '%s'"), str0);
if (errno != 0 && (n == ULONG_MAX || n == 0))
err(EXIT_FAILURE, _("failed to parse list '%s'"), str0);
includes[nincludes++] = n;
if (nincludes == ARRAY_SIZE(includes))
/* TRANSLATORS: The standard value for %d is 256. */
errx(EXIT_FAILURE, _("the list of included devices is "
"too large (limit is %d devices)"),
(int)ARRAY_SIZE(includes));
str = end && *end ? end + 1 : NULL;
}
}
static void __attribute__((__noreturn__)) help(FILE *out)
{
size_t i;
fprintf(out, _(
"\nUsage:\n"
" %s [options] [<device> ...]\n"), program_invocation_short_name);
fprintf(out, _(
"\nOptions:\n"
" -a, --all print all devices\n"
" -b, --bytes print SIZE in bytes rather than in human readable format\n"
" -d, --nodeps don't print slaves or holders\n"
" -D, --discard print discard capabilities\n"
" -e, --exclude <list> exclude devices by major number (default: RAM disks)\n"
" -I, --include <list> show only devices with specified major numbers\n"
" -f, --fs output info about filesystems\n"
" -h, --help usage information (this)\n"
" -i, --ascii use ascii characters only\n"
" -m, --perms output info about permissions\n"
" -l, --list use list format output\n"
" -n, --noheadings don't print headings\n"
" -o, --output <list> output columns\n"
" -P, --pairs use key=\"value\" output format\n"
" -r, --raw use raw output format\n"
" -s, --inverse inverse dependencies\n"
" -t, --topology output info about topology\n"
" -V, --version output version information and exit\n"));
fprintf(out, _("\nAvailable columns (for --output):\n"));
for (i = 0; i < NCOLS; i++)
fprintf(out, " %11s %s\n", infos[i].name, _(infos[i].help));
fprintf(out, USAGE_MAN_TAIL("lsblk(8)"));
exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
}
static void check_sysdevblock(void)
{
if (access(_PATH_SYS_DEVBLOCK, R_OK) != 0)
err(EXIT_FAILURE, _("failed to access sysfs directory: %s"),
_PATH_SYS_DEVBLOCK);
}
int main(int argc, char *argv[])
{
struct lsblk _ls;
int tt_flags = TT_FL_TREE;
int i, c, status = EXIT_FAILURE;
char *outarg = NULL;
static const struct option longopts[] = {
{ "all", 0, 0, 'a' },
{ "bytes", 0, 0, 'b' },
{ "nodeps", 0, 0, 'd' },
{ "discard", 0, 0, 'D' },
{ "help", 0, 0, 'h' },
{ "output", 1, 0, 'o' },
{ "perms", 0, 0, 'm' },
{ "noheadings", 0, 0, 'n' },
{ "list", 0, 0, 'l' },
{ "ascii", 0, 0, 'i' },
{ "raw", 0, 0, 'r' },
{ "inverse", 0, 0, 's' },
{ "fs", 0, 0, 'f' },
{ "exclude", 1, 0, 'e' },
{ "include", 1, 0, 'I' },
{ "topology", 0, 0, 't' },
{ "pairs", 0, 0, 'P' },
{ "version", 0, 0, 'V' },
{ NULL, 0, 0, 0 },
};
static const ul_excl_t excl[] = { /* rows and cols in in ASCII order */
{ 'I','e' },
{ 'P','l','r' },
{ 0 }
};
int excl_st[ARRAY_SIZE(excl)] = UL_EXCL_STATUS_INIT;
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
atexit(close_stdout);
lsblk = &_ls;
memset(lsblk, 0, sizeof(*lsblk));
while((c = getopt_long(argc, argv,
"abdDe:fhlnmo:PiI:rstV", longopts, NULL)) != -1) {
err_exclusive_options(c, longopts, excl, excl_st);
switch(c) {
case 'a':
lsblk->all_devices = 1;
break;
case 'b':
lsblk->bytes = 1;
break;
case 'd':
lsblk->nodeps = 1;
break;
case 'D':
columns[ncolumns++] = COL_NAME;
columns[ncolumns++] = COL_DALIGN;
columns[ncolumns++] = COL_DGRAN;
columns[ncolumns++] = COL_DMAX;
columns[ncolumns++] = COL_DZERO;
break;
case 'e':
parse_excludes(optarg);
break;
case 'h':
help(stdout);
break;
case 'l':
tt_flags &= ~TT_FL_TREE; /* disable the default */
break;
case 'n':
tt_flags |= TT_FL_NOHEADINGS;
break;
case 'o':
outarg = optarg;
break;
case 'P':
tt_flags |= TT_FL_EXPORT;
tt_flags &= ~TT_FL_TREE; /* disable the default */
break;
case 'i':
tt_flags |= TT_FL_ASCII;
break;
case 'I':
parse_includes(optarg);
break;
case 'r':
tt_flags &= ~TT_FL_TREE; /* disable the default */
tt_flags |= TT_FL_RAW; /* enable raw */
break;
case 's':
lsblk->inverse = 1;
break;
case 'f':
columns[ncolumns++] = COL_NAME;
columns[ncolumns++] = COL_FSTYPE;
columns[ncolumns++] = COL_LABEL;
columns[ncolumns++] = COL_UUID;
columns[ncolumns++] = COL_TARGET;
break;
case 'm':
columns[ncolumns++] = COL_NAME;
columns[ncolumns++] = COL_SIZE;
columns[ncolumns++] = COL_OWNER;
columns[ncolumns++] = COL_GROUP;
columns[ncolumns++] = COL_MODE;
break;
case 't':
columns[ncolumns++] = COL_NAME;
columns[ncolumns++] = COL_ALIOFF;
columns[ncolumns++] = COL_MINIO;
columns[ncolumns++] = COL_OPTIO;
columns[ncolumns++] = COL_PHYSEC;
columns[ncolumns++] = COL_LOGSEC;
columns[ncolumns++] = COL_ROTA;
columns[ncolumns++] = COL_SCHED;
columns[ncolumns++] = COL_RQ_SIZE;
columns[ncolumns++] = COL_RA;
break;
case 'V':
printf(_("%s from %s\n"), program_invocation_short_name,
PACKAGE_STRING);
return EXIT_SUCCESS;
default:
help(stderr);
}
}
check_sysdevblock();
if (!ncolumns) {
columns[ncolumns++] = COL_NAME;
columns[ncolumns++] = COL_MAJMIN;
columns[ncolumns++] = COL_RM;
columns[ncolumns++] = COL_SIZE;
columns[ncolumns++] = COL_RO;
columns[ncolumns++] = COL_TYPE;
columns[ncolumns++] = COL_TARGET;
}
if (outarg && string_add_to_idarray(outarg, columns, ARRAY_SIZE(columns),
&ncolumns, column_name_to_id) < 0)
return EXIT_FAILURE;
if (nexcludes == 0 && nincludes == 0)
excludes[nexcludes++] = 1; /* default: ignore RAM disks */
mnt_init_debug(0);
/*
* initialize output columns
*/
if (!(lsblk->tt = tt_new_table(tt_flags)))
errx(EXIT_FAILURE, _("failed to initialize output table"));
for (i = 0; i < ncolumns; i++) {
struct colinfo *ci = get_column_info(i);
int fl = ci->flags;
if (!(tt_flags & TT_FL_TREE) && get_column_id(i) == COL_NAME)
fl &= ~TT_FL_TREE;
if (!tt_define_column(lsblk->tt, ci->name, ci->whint, fl)) {
warn(_("failed to initialize output column"));
goto leave;
}
}
if (optind == argc)
status = iterate_block_devices();
else while (optind < argc)
status = process_one_device(argv[optind++]);
tt_print_table(lsblk->tt);
leave:
tt_free_table(lsblk->tt);
mnt_free_table(mtab);
mnt_free_table(swaps);
mnt_free_cache(mntcache);
return status;
}
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