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findmnt.c
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/*
* findmnt(8)
*
* Copyright (C) 2010-2015 Red Hat, Inc. All rights reserved.
* Written by Karel Zak <[email protected]>
*
* 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 <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <getopt.h>
#include <string.h>
#include <termios.h>
#ifdef HAVE_SYS_IOCTL_H
# include <sys/ioctl.h>
#endif
#include <assert.h>
#include <poll.h>
#include <sys/statvfs.h>
#include <sys/types.h>
#ifdef HAVE_LIBUDEV
# include <libudev.h>
#endif
#include <libmount.h>
#include <libsmartcols.h>
#include "pathnames.h"
#include "nls.h"
#include "closestream.h"
#include "c.h"
#include "strutils.h"
#include "xalloc.h"
#include "optutils.h"
#include "mangle.h"
#include "findmnt.h"
/* column IDs */
enum {
COL_SOURCE,
COL_TARGET,
COL_FSTYPE,
COL_OPTIONS,
COL_VFS_OPTIONS,
COL_FS_OPTIONS,
COL_LABEL,
COL_UUID,
COL_PARTLABEL,
COL_PARTUUID,
COL_MAJMIN,
COL_ACTION,
COL_OLD_TARGET,
COL_OLD_OPTIONS,
COL_SIZE,
COL_AVAIL,
COL_USED,
COL_USEPERC,
COL_FSROOT,
COL_TID,
COL_ID,
COL_OPT_FIELDS,
COL_PROPAGATION,
COL_FREQ,
COL_PASSNO
};
enum {
TABTYPE_FSTAB = 1,
TABTYPE_MTAB,
TABTYPE_KERNEL
};
/* column names */
struct colinfo {
const char *name; /* header */
double whint; /* width hint (N < 1 is in percent of termwidth) */
int flags; /* libsmartcols flags */
const char *help; /* column description */
const char *match; /* pattern for match_func() */
void *match_data; /* match specific data */
};
/* columns descriptions (don't use const, this is writable) */
static struct colinfo infos[] = {
[COL_SOURCE] = { "SOURCE", 0.25, SCOLS_FL_NOEXTREMES, N_("source device") },
[COL_TARGET] = { "TARGET", 0.30, SCOLS_FL_TREE| SCOLS_FL_NOEXTREMES, N_("mountpoint") },
[COL_FSTYPE] = { "FSTYPE", 0.10, SCOLS_FL_TRUNC, N_("filesystem type") },
[COL_OPTIONS] = { "OPTIONS", 0.10, SCOLS_FL_TRUNC, N_("all mount options") },
[COL_VFS_OPTIONS] = { "VFS-OPTIONS", 0.20, SCOLS_FL_TRUNC, N_("VFS specific mount options") },
[COL_FS_OPTIONS] = { "FS-OPTIONS", 0.10, SCOLS_FL_TRUNC, N_("FS specific mount options") },
[COL_LABEL] = { "LABEL", 0.10, 0, N_("filesystem label") },
[COL_UUID] = { "UUID", 36, 0, N_("filesystem UUID") },
[COL_PARTLABEL] = { "PARTLABEL", 0.10, 0, N_("partition label") },
[COL_PARTUUID] = { "PARTUUID", 36, 0, N_("partition UUID") },
[COL_MAJMIN] = { "MAJ:MIN", 6, 0, N_("major:minor device number") },
[COL_ACTION] = { "ACTION", 10, SCOLS_FL_STRICTWIDTH, N_("action detected by --poll") },
[COL_OLD_OPTIONS] = { "OLD-OPTIONS", 0.10, SCOLS_FL_TRUNC, N_("old mount options saved by --poll") },
[COL_OLD_TARGET] = { "OLD-TARGET", 0.30, 0, N_("old mountpoint saved by --poll") },
[COL_SIZE] = { "SIZE", 5, SCOLS_FL_RIGHT, N_("filesystem size") },
[COL_AVAIL] = { "AVAIL", 5, SCOLS_FL_RIGHT, N_("filesystem size available") },
[COL_USED] = { "USED", 5, SCOLS_FL_RIGHT, N_("filesystem size used") },
[COL_USEPERC] = { "USE%", 3, SCOLS_FL_RIGHT, N_("filesystem use percentage") },
[COL_FSROOT] = { "FSROOT", 0.25, SCOLS_FL_NOEXTREMES, N_("filesystem root") },
[COL_TID] = { "TID", 4, SCOLS_FL_RIGHT, N_("task ID") },
[COL_ID] = { "ID", 2, SCOLS_FL_RIGHT, N_("mount ID") },
[COL_OPT_FIELDS] = { "OPT-FIELDS", 0.10, SCOLS_FL_TRUNC, N_("optional mount fields") },
[COL_PROPAGATION] = { "PROPAGATION", 0.10, 0, N_("VFS propagation flags") },
[COL_FREQ] = { "FREQ", 1, SCOLS_FL_RIGHT, N_("dump(8) period in days [fstab only]") },
[COL_PASSNO] = { "PASSNO", 1, SCOLS_FL_RIGHT, N_("pass number on parallel fsck(8) [fstab only]") }
};
/* columns[] array specifies all currently wanted output column. The columns
* are defined by infos[] array and you can specify (on command line) each
* column twice. That's enough, dynamically allocated array of the columns is
* unnecessary overkill and over-engineering in this case */
static int columns[ARRAY_SIZE(infos) * 2];
static size_t ncolumns;
static inline size_t err_columns_index(size_t arysz, size_t idx)
{
if (idx >= arysz)
errx(EXIT_FAILURE, _("too many columns specified, "
"the limit is %zu columns"),
arysz - 1);
return idx;
}
#define add_column(ary, n, id) \
((ary)[ err_columns_index(ARRAY_SIZE(ary), (n)) ] = (id))
/* poll actions (parsed --poll=<list> */
#define FINDMNT_NACTIONS 4 /* mount, umount, move, remount */
static int actions[FINDMNT_NACTIONS];
static int nactions;
/* global (accessed from findmnt-verify.c too) */
int flags;
int parse_nerrors;
struct libmnt_cache *cache;
#ifdef HAVE_LIBUDEV
static struct udev *udev;
#endif
static int match_func(struct libmnt_fs *fs, void *data __attribute__ ((__unused__)));
static int get_column_id(int num)
{
assert(num >= 0);
assert((size_t) num < ncolumns);
assert((size_t) columns[num] < ARRAY_SIZE(infos));
return columns[num];
}
static struct colinfo *get_column_info(int num)
{
return &infos[ get_column_id(num) ];
}
static const char *column_id_to_name(int id)
{
assert((size_t) id < ARRAY_SIZE(infos));
return infos[id].name;
}
static const char *get_column_name(int num)
{
return get_column_info(num)->name;
}
static float get_column_whint(int num)
{
return get_column_info(num)->whint;
}
static int get_column_flags(int num)
{
return get_column_info(num)->flags;
}
static const char *get_match(int id)
{
assert((size_t) id < ARRAY_SIZE(infos));
return infos[id].match;
}
static void *get_match_data(int id)
{
assert((size_t) id < ARRAY_SIZE(infos));
return infos[id].match_data;
}
static void set_match(int id, const char *match)
{
assert((size_t) id < ARRAY_SIZE(infos));
infos[id].match = match;
}
static void set_match_data(int id, void *data)
{
assert((size_t) id < ARRAY_SIZE(infos));
infos[id].match_data = data;
}
/*
* source match means COL_SOURCE *or* COL_MAJMIN, depends on
* data format.
*/
static void set_source_match(const char *data)
{
int maj, min;
if (sscanf(data, "%d:%d", &maj, &min) == 2) {
dev_t *devno = xmalloc(sizeof(dev_t));
*devno = makedev(maj, min);
set_match(COL_MAJMIN, data);
set_match_data(COL_MAJMIN, (void *) devno);
flags |= FL_NOSWAPMATCH;
} else
set_match(COL_SOURCE, data);
}
/*
* Extra functionality for --target <path>. The function mnt_table_find_mountpoint()
* also checks parents (path elements in reverse order) to get mountpoint.
*
* @tb has to be from kernel (so no fstab or so)!
*/
static void enable_extra_target_match(struct libmnt_table *tb)
{
char *cn = NULL;
const char *tgt = NULL, *mnt = NULL;
struct libmnt_fs *fs;
/*
* Check if match pattern is mountpoint, if not use the
* real mountpoint.
*/
if (flags & FL_NOCACHE)
tgt = get_match(COL_TARGET);
else {
tgt = cn = mnt_resolve_path(get_match(COL_TARGET), cache);
if (!cn)
return;
}
fs = mnt_table_find_mountpoint(tb, tgt, MNT_ITER_BACKWARD);
if (fs)
mnt = mnt_fs_get_target(fs);
if (mnt && strcmp(mnt, tgt) != 0)
set_match(COL_TARGET, xstrdup(mnt)); /* replace the current setting */
if (!cache)
free(cn);
}
static int is_tabdiff_column(int id)
{
assert((size_t) id < ARRAY_SIZE(infos));
switch(id) {
case COL_ACTION:
case COL_OLD_TARGET:
case COL_OLD_OPTIONS:
return 1;
default:
break;
}
return 0;
}
/*
* "findmnt" without any filter
*/
int is_listall_mode(void)
{
if ((flags & FL_DF) && !(flags & FL_ALL))
return 0;
return (!get_match(COL_SOURCE) &&
!get_match(COL_TARGET) &&
!get_match(COL_FSTYPE) &&
!get_match(COL_OPTIONS) &&
!get_match(COL_MAJMIN));
}
/*
* Returns 1 if the @act is in the --poll=<list>
*/
static int has_poll_action(int act)
{
int i;
if (!nactions)
return 1; /* all actions enabled */
for (i = 0; i < nactions; i++)
if (actions[i] == act)
return 1;
return 0;
}
static int poll_action_name_to_id(const char *name, size_t namesz)
{
int id = -1;
if (strncasecmp(name, "move", namesz) == 0 && namesz == 4)
id = MNT_TABDIFF_MOVE;
else if (strncasecmp(name, "mount", namesz) == 0 && namesz == 5)
id = MNT_TABDIFF_MOUNT;
else if (strncasecmp(name, "umount", namesz) == 0 && namesz == 6)
id = MNT_TABDIFF_UMOUNT;
else if (strncasecmp(name, "remount", namesz) == 0 && namesz == 7)
id = MNT_TABDIFF_REMOUNT;
else
warnx(_("unknown action: %s"), name);
return id;
}
/*
* findmnt --first-only <devname|TAG=|mountpoint>
*
* ... it works like "mount <devname|TAG=|mountpoint>"
*/
static int is_mount_compatible_mode(void)
{
if (!get_match(COL_SOURCE))
return 0; /* <devname|TAG=|mountpoint> is required */
if (get_match(COL_FSTYPE) || get_match(COL_OPTIONS))
return 0; /* cannot be restricted by -t or -O */
if (!(flags & FL_FIRSTONLY))
return 0; /* we have to return the first entry only */
return 1; /* ok */
}
static void disable_columns_truncate(void)
{
size_t i;
for (i = 0; i < ARRAY_SIZE(infos); i++)
infos[i].flags &= ~SCOLS_FL_TRUNC;
}
/*
* converts @name to column ID
*/
static int column_name_to_id(const char *name, size_t namesz)
{
size_t i;
for (i = 0; i < ARRAY_SIZE(infos); i++) {
const char *cn = column_id_to_name(i);
if (!strncasecmp(name, cn, namesz) && !*(cn + namesz))
return i;
}
warnx(_("unknown column: %s"), name);
return -1;
}
#ifdef HAVE_LIBUDEV
static char *get_tag_from_udev(const char *devname, int col)
{
struct udev_device *dev;
const char *data = NULL;
char *res = NULL, *path;
if (!udev)
udev = udev_new();
if (!udev)
return NULL;
/* libudev don't like /dev/mapper/ symlinks */
path = realpath(devname, NULL);
if (path)
devname = path;
if (strncmp(devname, "/dev/", 5) == 0)
devname += 5;
dev = udev_device_new_from_subsystem_sysname(udev, "block", devname);
free(path);
if (!dev)
return NULL;
switch(col) {
case COL_LABEL:
data = udev_device_get_property_value(dev, "ID_FS_LABEL_ENC");
break;
case COL_UUID:
data = udev_device_get_property_value(dev, "ID_FS_UUID_ENC");
break;
case COL_PARTUUID:
data = udev_device_get_property_value(dev, "ID_PART_ENTRY_UUID");
break;
case COL_PARTLABEL:
data = udev_device_get_property_value(dev, "ID_PART_ENTRY_NAME");
break;
default:
break;
}
if (data) {
res = xstrdup(data);
unhexmangle_string(res);
}
udev_device_unref(dev);
return res;
}
#endif /* HAVE_LIBUDEV */
/* Returns LABEL or UUID */
static char *get_tag(struct libmnt_fs *fs, const char *tagname, int col
#ifndef HAVE_LIBUDEV
__attribute__((__unused__))
#endif
)
{
const char *t, *v;
char *res = NULL;
if (!mnt_fs_get_tag(fs, &t, &v) && !strcmp(t, tagname))
res = xstrdup(v);
else {
const char *dev = mnt_fs_get_source(fs);
if (dev && !(flags & FL_NOCACHE))
dev = mnt_resolve_spec(dev, cache);
#ifdef HAVE_LIBUDEV
if (dev)
res = get_tag_from_udev(dev, col);
#endif
if (!res) {
res = mnt_cache_find_tag_value(cache, dev, tagname);
if (res && cache)
/* don't return pointer to cache */
res = xstrdup(res);
}
}
return res;
}
static char *get_vfs_attr(struct libmnt_fs *fs, int sizetype)
{
struct statvfs buf;
uint64_t vfs_attr = 0;
char *sizestr;
if (statvfs(mnt_fs_get_target(fs), &buf) != 0)
return NULL;
switch(sizetype) {
case COL_SIZE:
vfs_attr = buf.f_frsize * buf.f_blocks;
break;
case COL_AVAIL:
vfs_attr = buf.f_frsize * buf.f_bavail;
break;
case COL_USED:
vfs_attr = buf.f_frsize * (buf.f_blocks - buf.f_bfree);
break;
case COL_USEPERC:
if (buf.f_blocks == 0)
return xstrdup("-");
xasprintf(&sizestr, "%.0f%%",
(double)(buf.f_blocks - buf.f_bfree) /
buf.f_blocks * 100);
return sizestr;
}
if (!vfs_attr)
sizestr = xstrdup("0");
else if (flags & FL_BYTES)
xasprintf(&sizestr, "%ju", vfs_attr);
else
sizestr = size_to_human_string(SIZE_SUFFIX_1LETTER, vfs_attr);
return sizestr;
}
/* reads FS data from libmount
*/
static char *get_data(struct libmnt_fs *fs, int num)
{
char *str = NULL;
int col_id = get_column_id(num);
switch (col_id) {
case COL_SOURCE:
{
const char *root = mnt_fs_get_root(fs);
const char *spec = mnt_fs_get_srcpath(fs);
char *cn = NULL;
if (spec && (flags & FL_CANONICALIZE))
spec = cn = mnt_resolve_path(spec, cache);
if (!spec) {
spec = mnt_fs_get_source(fs);
if (spec && (flags & FL_EVALUATE))
spec = cn = mnt_resolve_spec(spec, cache);
}
if (root && spec && !(flags & FL_NOFSROOT) && strcmp(root, "/"))
xasprintf(&str, "%s[%s]", spec, root);
else if (spec)
str = xstrdup(spec);
if (!cache)
free(cn);
break;
}
case COL_TARGET:
str = xstrdup(mnt_fs_get_target(fs));
break;
case COL_FSTYPE:
str = xstrdup(mnt_fs_get_fstype(fs));
break;
case COL_OPTIONS:
str = xstrdup(mnt_fs_get_options(fs));
break;
case COL_VFS_OPTIONS:
str = xstrdup(mnt_fs_get_vfs_options(fs));
break;
case COL_FS_OPTIONS:
str = xstrdup(mnt_fs_get_fs_options(fs));
break;
case COL_OPT_FIELDS:
str = xstrdup(mnt_fs_get_optional_fields(fs));
break;
case COL_UUID:
str = get_tag(fs, "UUID", col_id);
break;
case COL_PARTUUID:
str = get_tag(fs, "PARTUUID", col_id);
break;
case COL_LABEL:
str = get_tag(fs, "LABEL", col_id);
break;
case COL_PARTLABEL:
str = get_tag(fs, "PARTLABEL", col_id);
break;
case COL_MAJMIN:
{
dev_t devno = mnt_fs_get_devno(fs);
if (!devno)
break;
if ((flags & FL_RAW) || (flags & FL_EXPORT) || (flags & FL_JSON))
xasprintf(&str, "%u:%u", major(devno), minor(devno));
else
xasprintf(&str, "%3u:%-3u", major(devno), minor(devno));
break;
}
case COL_SIZE:
case COL_AVAIL:
case COL_USED:
case COL_USEPERC:
str = get_vfs_attr(fs, col_id);
break;
case COL_FSROOT:
str = xstrdup(mnt_fs_get_root(fs));
break;
case COL_TID:
if (mnt_fs_get_tid(fs))
xasprintf(&str, "%d", mnt_fs_get_tid(fs));
break;
case COL_ID:
if (mnt_fs_get_id(fs))
xasprintf(&str, "%d", mnt_fs_get_id(fs));
break;
case COL_PROPAGATION:
if (mnt_fs_is_kernel(fs)) {
unsigned long fl = 0;
char *n = NULL;
if (mnt_fs_get_propagation(fs, &fl) != 0)
break;
n = xstrdup((fl & MS_SHARED) ? "shared" : "private");
if (fl & MS_SLAVE) {
xasprintf(&str, "%s,slave", n);
free(n);
n = str;
}
if (fl & MS_UNBINDABLE) {
xasprintf(&str, "%s,unbindable", n);
free(n);
n = str;
}
str = n;
}
break;
case COL_FREQ:
if (!mnt_fs_is_kernel(fs))
xasprintf(&str, "%d", mnt_fs_get_freq(fs));
break;
case COL_PASSNO:
if (!mnt_fs_is_kernel(fs))
xasprintf(&str, "%d", mnt_fs_get_passno(fs));
break;
default:
break;
}
return str;
}
static char *get_tabdiff_data(struct libmnt_fs *old_fs,
struct libmnt_fs *new_fs,
int change,
int num)
{
char *str = NULL;
switch (get_column_id(num)) {
case COL_ACTION:
switch (change) {
case MNT_TABDIFF_MOUNT:
str = _("mount");
break;
case MNT_TABDIFF_UMOUNT:
str = _("umount");
break;
case MNT_TABDIFF_REMOUNT:
str = _("remount");
break;
case MNT_TABDIFF_MOVE:
str = _("move");
break;
default:
str = _("unknown");
break;
}
str = xstrdup(str);
break;
case COL_OLD_OPTIONS:
if (old_fs && (change == MNT_TABDIFF_REMOUNT ||
change == MNT_TABDIFF_UMOUNT))
str = xstrdup(mnt_fs_get_options(old_fs));
break;
case COL_OLD_TARGET:
if (old_fs && (change == MNT_TABDIFF_MOVE ||
change == MNT_TABDIFF_UMOUNT))
str = xstrdup(mnt_fs_get_target(old_fs));
break;
default:
if (new_fs)
str = get_data(new_fs, num);
else
str = get_data(old_fs, num);
break;
}
return str;
}
/* adds one line to the output @tab */
static struct libscols_line *add_line(struct libscols_table *table, struct libmnt_fs *fs,
struct libscols_line *parent)
{
size_t i;
struct libscols_line *line = scols_table_new_line(table, parent);
if (!line)
err(EXIT_FAILURE, _("failed to allocate output line"));
for (i = 0; i < ncolumns; i++) {
if (scols_line_refer_data(line, i, get_data(fs, i)))
err(EXIT_FAILURE, _("failed to add output data"));
}
scols_line_set_userdata(line, fs);
return line;
}
static struct libscols_line *add_tabdiff_line(struct libscols_table *table, struct libmnt_fs *new_fs,
struct libmnt_fs *old_fs, int change)
{
size_t i;
struct libscols_line *line = scols_table_new_line(table, NULL);
if (!line)
err(EXIT_FAILURE, _("failed to allocate output line"));
for (i = 0; i < ncolumns; i++) {
if (scols_line_refer_data(line, i,
get_tabdiff_data(old_fs, new_fs, change, i)))
err(EXIT_FAILURE, _("failed to add output data"));
}
return line;
}
static int has_line(struct libscols_table *table, struct libmnt_fs *fs)
{
struct libscols_line *ln;
struct libscols_iter *itr;
int rc = 0;
itr = scols_new_iter(SCOLS_ITER_FORWARD);
if (!itr)
return 0;
while (scols_table_next_line(table, itr, &ln) == 0) {
if ((struct libmnt_fs *) scols_line_get_userdata(ln) == fs) {
rc = 1;
break;
}
}
scols_free_iter(itr);
return rc;
}
/* reads filesystems from @tb (libmount) and fillin @table (output table) */
static int create_treenode(struct libscols_table *table, struct libmnt_table *tb,
struct libmnt_fs *fs, struct libscols_line *parent_line)
{
struct libmnt_fs *chld = NULL;
struct libmnt_iter *itr = NULL;
struct libscols_line *line;
int rc = -1;
if (!fs) {
/* first call, get root FS */
if (mnt_table_get_root_fs(tb, &fs))
goto leave;
parent_line = NULL;
} else if ((flags & FL_SUBMOUNTS) && has_line(table, fs))
return 0;
itr = mnt_new_iter(MNT_ITER_FORWARD);
if (!itr)
goto leave;
if ((flags & FL_SUBMOUNTS) || match_func(fs, NULL)) {
line = add_line(table, fs, parent_line);
if (!line)
goto leave;
} else
line = parent_line;
/*
* add all children to the output table
*/
while(mnt_table_next_child_fs(tb, itr, fs, &chld) == 0) {
if (create_treenode(table, tb, chld, line))
goto leave;
}
rc = 0;
leave:
mnt_free_iter(itr);
return rc;
}
/* error callback */
static int parser_errcb(struct libmnt_table *tb __attribute__ ((__unused__)),
const char *filename, int line)
{
warnx(_("%s: parse error at line %d -- ignored"), filename, line);
++parse_nerrors;
return 1;
}
static char **append_tabfile(char **files, int *nfiles, char *filename)
{
files = xrealloc(files, sizeof(char *) * (*nfiles + 1));
files[(*nfiles)++] = filename;
return files;
}
static char **append_pid_tabfile(char **files, int *nfiles, pid_t pid)
{
char *path = NULL;
xasprintf(&path, "/proc/%d/mountinfo", (int) pid);
return append_tabfile(files, nfiles, path);
}
/* calls libmount fstab/mtab/mountinfo parser */
static struct libmnt_table *parse_tabfiles(char **files,
int nfiles,
int tabtype)
{
struct libmnt_table *tb;
int rc = 0;
tb = mnt_new_table();
if (!tb) {
warn(_("failed to initialize libmount table"));
return NULL;
}
mnt_table_set_parser_errcb(tb, parser_errcb);
do {
/* NULL means that libmount will use default paths */
const char *path = nfiles ? *files++ : NULL;
switch (tabtype) {
case TABTYPE_FSTAB:
rc = mnt_table_parse_fstab(tb, path);
break;
case TABTYPE_MTAB:
rc = mnt_table_parse_mtab(tb, path);
break;
case TABTYPE_KERNEL:
if (!path)
path = access(_PATH_PROC_MOUNTINFO, R_OK) == 0 ?
_PATH_PROC_MOUNTINFO :
_PATH_PROC_MOUNTS;
rc = mnt_table_parse_file(tb, path);
break;
}
if (rc) {
mnt_unref_table(tb);
warn(_("can't read %s"), path);
return NULL;
}
} while (--nfiles > 0);
return tb;
}
/*
* Parses mountinfo and calls mnt_cache_set_targets(cache, mtab). Only
* necessary if @tb in main() was read from a non-kernel source.
*/
static void cache_set_targets(struct libmnt_cache *tmp)
{
struct libmnt_table *tb;
const char *path;
tb = mnt_new_table();
if (!tb)
return;
path = access(_PATH_PROC_MOUNTINFO, R_OK) == 0 ?
_PATH_PROC_MOUNTINFO :
_PATH_PROC_MOUNTS;
if (mnt_table_parse_file(tb, path) == 0)
mnt_cache_set_targets(tmp, tb);
mnt_unref_table(tb);
}
/* checks if @tb contains parent->child relations */
static int tab_is_tree(struct libmnt_table *tb)
{
struct libmnt_fs *fs = NULL;
struct libmnt_iter *itr;
int rc = 0;
itr = mnt_new_iter(MNT_ITER_BACKWARD);
if (!itr)
return 0;
rc = (mnt_table_next_fs(tb, itr, &fs) == 0 &&
mnt_fs_is_kernel(fs) &&
mnt_fs_get_root(fs));
mnt_free_iter(itr);
return rc;
}
/* checks if all fs in @tb are from kernel */
static int tab_is_kernel(struct libmnt_table *tb)
{
struct libmnt_fs *fs = NULL;
struct libmnt_iter *itr;
itr = mnt_new_iter(MNT_ITER_BACKWARD);
if (!itr)
return 0;
while (mnt_table_next_fs(tb, itr, &fs) == 0) {
if (!mnt_fs_is_kernel(fs)) {
mnt_free_iter(itr);
return 0;
}
}
mnt_free_iter(itr);
return 1;
}
/* filter function for libmount (mnt_table_find_next_fs()) */
static int match_func(struct libmnt_fs *fs,
void *data __attribute__ ((__unused__)))
{
int rc = flags & FL_INVERT ? 1 : 0;
const char *m;
void *md;
m = get_match(COL_FSTYPE);
if (m && !mnt_fs_match_fstype(fs, m))
return rc;
m = get_match(COL_OPTIONS);
if (m && !mnt_fs_match_options(fs, m))
return rc;
md = get_match_data(COL_MAJMIN);
if (md && mnt_fs_get_devno(fs) != *((dev_t *) md))
return rc;
m = get_match(COL_TARGET);
if (m && !mnt_fs_match_target(fs, m, cache))
return rc;
m = get_match(COL_SOURCE);
if (m && !mnt_fs_match_source(fs, m, cache))
return rc;
if ((flags & FL_DF) && !(flags & FL_ALL)) {
const char *type = mnt_fs_get_fstype(fs);
if (type && strstr(type, "tmpfs")) /* tmpfs is wanted */
return !rc;
if (mnt_fs_is_pseudofs(fs))
return rc;
}
if ((flags & FL_REAL) && mnt_fs_is_pseudofs(fs))
return rc;
if ((flags & FL_PSEUDO) && !mnt_fs_is_pseudofs(fs))
return rc;
return !rc;
}
/* iterate over filesystems in @tb */
struct libmnt_fs *get_next_fs(struct libmnt_table *tb,
struct libmnt_iter *itr)
{
struct libmnt_fs *fs = NULL;
if (is_listall_mode()) {
/*
* Print whole file
*/
if (mnt_table_next_fs(tb, itr, &fs) != 0)
return NULL;
} else if (is_mount_compatible_mode()) {
/*
* Look up for FS in the same way how mount(8) searches in fstab
*
* findmnt -f <spec>
*/
fs = mnt_table_find_source(tb, get_match(COL_SOURCE),
mnt_iter_get_direction(itr));
if (!fs && !(flags & FL_NOSWAPMATCH))
fs = mnt_table_find_target(tb, get_match(COL_SOURCE),
mnt_iter_get_direction(itr));
} else {
/*
* Look up for all matching entries
*
* findmnt [-l] <source> <target> [-O <options>] [-t <types>]
* findmnt [-l] <spec> [-O <options>] [-t <types>]
*/
again:
mnt_table_find_next_fs(tb, itr, match_func, NULL, &fs);
if (!fs &&
!(flags & FL_NOSWAPMATCH) &&
!get_match(COL_TARGET) && get_match(COL_SOURCE)) {
/* swap 'spec' and target. */
set_match(COL_TARGET, get_match(COL_SOURCE));
set_match(COL_SOURCE, NULL);