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util-linux/disk-utils/fsck.c

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/*
* fsck --- A generic, parallelizing front-end for the fsck program.
* It will automatically try to run fsck programs in parallel if the
* devices are on separate spindles. It is based on the same ideas as
* the generic front end for fsck by David Engel and Fred van Kempen,
* but it has been completely rewritten from scratch to support
* parallel execution.
*
* Written by Theodore Ts'o, <tytso@mit.edu>
*
* Miquel van Smoorenburg (miquels@drinkel.ow.org) 20-Oct-1994:
* o Changed -t fstype to behave like with mount when -A (all file
* systems) or -M (like mount) is specified.
* o fsck looks if it can find the fsck.type program to decide
* if it should ignore the fs type. This way more fsck programs
* can be added without changing this front-end.
* o -R flag skip root file system.
*
* Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
* 2001, 2002, 2003, 2004, 2005 by Theodore Ts'o.
*
* Copyright (C) 2009-2014 Karel Zak <kzak@redhat.com>
*
* This file may be redistributed under the terms of the GNU Public
* License.
*/
#define _XOPEN_SOURCE 600 /* for inclusion of sa_handler in Solaris */
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <time.h>
#include <stdlib.h>
#include <paths.h>
#include <unistd.h>
#include <errno.h>
#include <signal.h>
#include <dirent.h>
#include <sys/resource.h>
#include <sys/time.h>
#include <blkid.h>
#include <libmount.h>
#include "nls.h"
#include "pathnames.h"
#include "exitcodes.h"
#include "c.h"
#include "fileutils.h"
#include "monotonic.h"
#include "strutils.h"
#define XALLOC_EXIT_CODE FSCK_EX_ERROR
#include "xalloc.h"
#define CLOSE_EXIT_CODE FSCK_EX_ERROR
#include "closestream.h"
#ifndef DEFAULT_FSTYPE
# define DEFAULT_FSTYPE "ext2"
#endif
#define MAX_DEVICES 32
#define MAX_ARGS 32
#define FSCK_RUNTIME_DIRNAME "/run/fsck"
static const char *ignored_types[] = {
"ignore",
"iso9660",
"sw",
NULL
};
static const char *really_wanted[] = {
"minix",
"ext2",
"ext3",
"ext4",
"ext4dev",
"jfs",
"reiserfs"
};
/*
* Internal structure for mount table entries.
*/
struct fsck_fs_data
{
const char *device;
dev_t disk;
unsigned int stacked:1,
done:1,
eval_device:1;
};
/*
* Structure to allow exit codes to be stored
*/
struct fsck_instance {
int pid;
int flags; /* FLAG_{DONE|PROGRESS} */
int lock; /* flock()ed lockpath file descriptor or -1 */
char *lockpath; /* /run/fsck/<diskname>.lock or NULL */
int exit_status;
struct timeval start_time;
struct timeval end_time;
char * prog;
char * type;
struct rusage rusage;
struct libmnt_fs *fs;
struct fsck_instance *next;
};
#define FLAG_DONE 1
#define FLAG_PROGRESS 2
/*
* Global variables for options
*/
static char *devices[MAX_DEVICES];
static char *args[MAX_ARGS];
static int num_devices, num_args;
static int lockdisk;
static int verbose;
static int doall;
static int noexecute;
static int serialize;
static int skip_root;
static int ignore_mounted;
static int notitle;
static int parallel_root;
static int progress;
static int progress_fd;
static int force_all_parallel;
static int report_stats;
static FILE *report_stats_file;
static int num_running;
static int max_running;
static volatile int cancel_requested;
static int kill_sent;
static char *fstype;
static struct fsck_instance *instance_list;
#define FSCK_DEFAULT_PATH "/sbin"
static char *fsck_path;
/* parsed fstab and mtab */
static struct libmnt_table *fstab, *mtab;
static struct libmnt_cache *mntcache;
static int count_slaves(dev_t disk);
static int string_to_int(const char *s)
{
long l;
char *p;
errno = 0;
l = strtol(s, &p, 0);
if (errno || *p || l == LONG_MIN || l == LONG_MAX || l < 0 || l > INT_MAX)
return -1;
return (int) l;
}
/* Do we really really want to check this fs? */
static int fs_check_required(const char *type)
{
size_t i;
for(i = 0; i < ARRAY_SIZE(really_wanted); i++) {
if (strcmp(type, really_wanted[i]) == 0)
return 1;
}
return 0;
}
static int is_mounted(struct libmnt_fs *fs)
{
int rc;
const char *src;
src = mnt_fs_get_source(fs);
if (!src)
return 0;
if (!mntcache)
mntcache = mnt_new_cache();
if (!mtab) {
mtab = mnt_new_table();
if (!mtab)
err(FSCK_EX_ERROR, ("failed to initialize libmount table"));
mnt_table_set_cache(mtab, mntcache);
mnt_table_parse_mtab(mtab, NULL);
}
rc = mnt_table_find_source(mtab, src, MNT_ITER_BACKWARD) ? 1 : 0;
if (verbose) {
if (rc)
printf(_("%s is mounted\n"), src);
else
printf(_("%s is not mounted\n"), src);
}
return rc;
}
static int ignore(struct libmnt_fs *);
static struct fsck_fs_data *fs_create_data(struct libmnt_fs *fs)
{
struct fsck_fs_data *data = mnt_fs_get_userdata(fs);
if (!data) {
data = xcalloc(1, sizeof(*data));
mnt_fs_set_userdata(fs, data);
}
return data;
}
/*
* fs from fstab might contains real device name as well as symlink,
* LABEL or UUID, this function returns canonicalized result.
*/
static const char *fs_get_device(struct libmnt_fs *fs)
{
struct fsck_fs_data *data = mnt_fs_get_userdata(fs);
if (!data || !data->eval_device) {
const char *spec = mnt_fs_get_source(fs);
if (!data)
data = fs_create_data(fs);
data->eval_device = 1;
data->device = mnt_resolve_spec(spec, mnt_table_get_cache(fstab));
if (!data->device)
data->device = xstrdup(spec);
}
return data->device;
}
static dev_t fs_get_disk(struct libmnt_fs *fs, int check)
{
struct fsck_fs_data *data;
const char *device;
struct stat st;
data = mnt_fs_get_userdata(fs);
if (data && data->disk)
return data->disk;
if (!check)
return 0;
if (mnt_fs_is_netfs(fs) || mnt_fs_is_pseudofs(fs))
return 0;
device = fs_get_device(fs);
if (!device)
return 0;
data = fs_create_data(fs);
if (!stat(device, &st) &&
!blkid_devno_to_wholedisk(st.st_rdev, NULL, 0, &data->disk)) {
if (data->disk)
data->stacked = count_slaves(data->disk) > 0 ? 1 : 0;
return data->disk;
}
return 0;
}
static int fs_is_stacked(struct libmnt_fs *fs)
{
struct fsck_fs_data *data = mnt_fs_get_userdata(fs);
return data ? data->stacked : 0;
}
static int fs_is_done(struct libmnt_fs *fs)
{
struct fsck_fs_data *data = mnt_fs_get_userdata(fs);
return data ? data->done : 0;
}
static void fs_set_done(struct libmnt_fs *fs)
{
struct fsck_fs_data *data = fs_create_data(fs);
if (data)
data->done = 1;
}
static int is_irrotational_disk(dev_t disk)
{
char path[PATH_MAX];
FILE *f;
int rc, x;
rc = snprintf(path, sizeof(path),
"/sys/dev/block/%d:%d/queue/rotational",
major(disk), minor(disk));
if (rc < 0 || (unsigned int) rc >= sizeof(path))
return 0;
f = fopen(path, "r");
if (!f)
return 0;
rc = fscanf(f, "%d", &x);
if (rc != 1) {
if (ferror(f))
warn(_("cannot read %s"), path);
else
warnx(_("parse error: %s"), path);
}
fclose(f);
return rc == 1 ? !x : 0;
}
static void lock_disk(struct fsck_instance *inst)
{
dev_t disk = fs_get_disk(inst->fs, 1);
char *diskpath = NULL, *diskname;
inst->lock = -1;
if (!disk || is_irrotational_disk(disk))
goto done;
diskpath = blkid_devno_to_devname(disk);
if (!diskpath)
goto done;
if (access(FSCK_RUNTIME_DIRNAME, F_OK) != 0) {
int rc = mkdir(FSCK_RUNTIME_DIRNAME,
S_IWUSR|
S_IRUSR|S_IRGRP|S_IROTH|
S_IXUSR|S_IXGRP|S_IXOTH);
if (rc && errno != EEXIST) {
warn(_("cannot create directory %s"),
FSCK_RUNTIME_DIRNAME);
goto done;
}
}
diskname = stripoff_last_component(diskpath);
if (!diskname)
diskname = diskpath;
xasprintf(&inst->lockpath, FSCK_RUNTIME_DIRNAME "/%s.lock", diskname);
if (verbose)
printf(_("Locking disk by %s ... "), inst->lockpath);
inst->lock = open(inst->lockpath, O_RDONLY|O_CREAT|O_CLOEXEC,
S_IWUSR|S_IRUSR|S_IRGRP|S_IROTH);
if (inst->lock >= 0) {
int rc = -1;
/* inform users that we're waiting on the lock */
if (verbose &&
(rc = flock(inst->lock, LOCK_EX | LOCK_NB)) != 0 &&
errno == EWOULDBLOCK)
printf(_("(waiting) "));
if (rc != 0 && flock(inst->lock, LOCK_EX) != 0) {
close(inst->lock); /* failed */
inst->lock = -1;
}
}
if (verbose)
/* TRANSLATORS: These are followups to "Locking disk...". */
printf("%s.\n", inst->lock >= 0 ? _("succeeded") : _("failed"));
done:
if (inst->lock < 0) {
free(inst->lockpath);
inst->lockpath = NULL;
}
free(diskpath);
}
static void unlock_disk(struct fsck_instance *inst)
{
if (inst->lock < 0)
return;
if (verbose)
printf(_("Unlocking %s.\n"), inst->lockpath);
close(inst->lock); /* unlock */
free(inst->lockpath);
inst->lock = -1;
inst->lockpath = NULL;
}
static void free_instance(struct fsck_instance *i)
{
if (lockdisk)
unlock_disk(i);
free(i->prog);
free(i->lockpath);
mnt_unref_fs(i->fs);
free(i);
}
static struct libmnt_fs *add_dummy_fs(const char *device)
{
struct libmnt_fs *fs = mnt_new_fs();
if (fs && mnt_fs_set_source(fs, device) == 0 &&
mnt_table_add_fs(fstab, fs) == 0) {
mnt_unref_fs(fs);
return fs;
}
mnt_unref_fs(fs);
err(FSCK_EX_ERROR, _("failed to setup description for %s"), device);
}
static void fs_interpret_type(struct libmnt_fs *fs)
{
const char *device;
const char *type = mnt_fs_get_fstype(fs);
if (type && strcmp(type, "auto") != 0)
return;
mnt_fs_set_fstype(fs, NULL);
device = fs_get_device(fs);
if (device) {
int ambi = 0;
char *tp;
struct libmnt_cache *cache = mnt_table_get_cache(fstab);
tp = mnt_get_fstype(device, &ambi, cache);
if (!ambi)
mnt_fs_set_fstype(fs, tp);
if (!cache)
free(tp);
}
}
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);
return 1;
}
/*
* Load the filesystem database from /etc/fstab
*/
static void load_fs_info(void)
{
const char *path;
fstab = mnt_new_table();
if (!fstab)
err(FSCK_EX_ERROR, ("failed to initialize libmount table"));
mnt_table_set_parser_errcb(fstab, parser_errcb);
mnt_table_set_cache(fstab, mntcache);
errno = 0;
/*
* Let's follow libmount defaults if $FSTAB_FILE is not specified
*/
path = getenv("FSTAB_FILE");
if (mnt_table_parse_fstab(fstab, path)) {
if (!path)
path = mnt_get_fstab_path();
/* don't print error when there is no fstab at all */
if (access(path, F_OK) == 0) {
if (errno)
warn(_("%s: failed to parse fstab"), path);
else
warnx(_("%s: failed to parse fstab"), path);
}
}
}
/*
* Lookup filesys in /etc/fstab and return the corresponding entry.
* The @path has to be real path (no TAG) by mnt_resolve_spec().
*/
static struct libmnt_fs *lookup(char *path)
{
struct libmnt_fs *fs;
if (!path)
return NULL;
fs = mnt_table_find_srcpath(fstab, path, MNT_ITER_FORWARD);
if (!fs) {
/*
* Maybe mountpoint has been specified on fsck command line.
* Yeah, crazy feature...
*
* Note that mnt_table_find_target() may canonicalize paths in
* the fstab to support symlinks. This is really unwanted,
* because readlink() on mountpoints may trigger automounts.
*
* So, disable the cache and compare the paths as strings
* without care about symlinks...
*/
mnt_table_set_cache(fstab, NULL);
fs = mnt_table_find_target(fstab, path, MNT_ITER_FORWARD);
mnt_table_set_cache(fstab, mntcache);
}
return fs;
}
/* Find fsck program for a given fs type. */
static int find_fsck(const char *type, char **progpath)
{
char *s;
const char *tpl;
char *prog = NULL;
char *p = xstrdup(fsck_path);
int rc;
/* Are we looking for a program or just a type? */
tpl = (strncmp(type, "fsck.", 5) ? "%s/fsck.%s" : "%s/%s");
for(s = strtok(p, ":"); s; s = strtok(NULL, ":")) {
xasprintf(&prog, tpl, s, type);
if (access(prog, X_OK) == 0)
break;
free(prog);
prog = NULL;
}
free(p);
rc = prog ? 1 : 0;
if (progpath)
*progpath = prog;
else
free(prog);
return rc;
}
static int progress_active(void)
{
struct fsck_instance *inst;
for (inst = instance_list; inst; inst = inst->next) {
if (inst->flags & FLAG_DONE)
continue;
if (inst->flags & FLAG_PROGRESS)
return 1;
}
return 0;
}
/*
* Process run statistics for finished fsck instances.
*
* If report_stats is 0, do nothing, otherwise print a selection of
* interesting rusage statistics as well as elapsed wallclock time.
*/
static void print_stats(struct fsck_instance *inst)
{
struct timeval delta;
if (!inst || !report_stats || noexecute)
return;
timersub(&inst->end_time, &inst->start_time, &delta);
if (report_stats_file)
fprintf(report_stats_file, "%s %d %ld"
" %"PRId64".%06"PRId64
" %"PRId64".%06"PRId64
" %"PRId64".%06"PRId64"\n",
fs_get_device(inst->fs),
inst->exit_status,
inst->rusage.ru_maxrss,
(int64_t)delta.tv_sec, (int64_t)delta.tv_usec,
(int64_t)inst->rusage.ru_utime.tv_sec,
(int64_t)inst->rusage.ru_utime.tv_usec,
(int64_t)inst->rusage.ru_stime.tv_sec,
(int64_t)inst->rusage.ru_stime.tv_usec);
else
fprintf(stdout, "%s: status %d, rss %ld, "
"real %"PRId64".%06"PRId64", "
"user %"PRId64".%06"PRId64", "
"sys %"PRId64".%06"PRId64"\n",
fs_get_device(inst->fs),
inst->exit_status,
inst->rusage.ru_maxrss,
(int64_t)delta.tv_sec, (int64_t)delta.tv_usec,
(int64_t)inst->rusage.ru_utime.tv_sec,
(int64_t)inst->rusage.ru_utime.tv_usec,
(int64_t)inst->rusage.ru_stime.tv_sec,
(int64_t)inst->rusage.ru_stime.tv_usec);
}
/*
* Execute a particular fsck program, and link it into the list of
* child processes we are waiting for.
*/
static int execute(const char *progname, const char *progpath,
const char *type, struct libmnt_fs *fs, int interactive)
{
char *argv[80];
int argc, i;
struct fsck_instance *inst, *p;
pid_t pid;
inst = xcalloc(1, sizeof(*inst));
argv[0] = xstrdup(progname);
argc = 1;
for (i=0; i <num_args; i++)
argv[argc++] = xstrdup(args[i]);
if (progress &&
((strcmp(type, "ext2") == 0) ||
(strcmp(type, "ext3") == 0) ||
(strcmp(type, "ext4") == 0) ||
(strcmp(type, "ext4dev") == 0))) {
char tmp[80];
tmp[0] = 0;
if (!progress_active()) {
snprintf(tmp, 80, "-C%d", progress_fd);
inst->flags |= FLAG_PROGRESS;
} else if (progress_fd)
snprintf(tmp, 80, "-C%d", progress_fd * -1);
if (tmp[0])
argv[argc++] = xstrdup(tmp);
}
argv[argc++] = xstrdup(fs_get_device(fs));
argv[argc] = NULL;
if (verbose || noexecute) {
const char *tgt = mnt_fs_get_target(fs);
if (!tgt)
tgt = fs_get_device(fs);
printf("[%s (%d) -- %s] ", progpath, num_running, tgt);
for (i=0; i < argc; i++)
printf("%s ", argv[i]);
printf("\n");
}
mnt_ref_fs(fs);
inst->fs = fs;
inst->lock = -1;
if (lockdisk)
lock_disk(inst);
/* Fork and execute the correct program. */
if (noexecute)
pid = -1;
else if ((pid = fork()) < 0) {
warn(_("fork failed"));
free_instance(inst);
return errno;
} else if (pid == 0) {
if (!interactive)
close(0);
execv(progpath, argv);
err(FSCK_EX_ERROR, _("%s: execute failed"), progpath);
}
for (i=0; i < argc; i++)
free(argv[i]);
inst->pid = pid;
inst->prog = xstrdup(progname);
inst->type = xstrdup(type);
gettime_monotonic(&inst->start_time);
inst->next = NULL;
/*
* Find the end of the list, so we add the instance on at the end.
*/
for (p = instance_list; p && p->next; p = p->next);
if (p)
p->next = inst;
else
instance_list = inst;
return 0;
}
/*
* Send a signal to all outstanding fsck child processes
*/
static int kill_all(int signum)
{
struct fsck_instance *inst;
int n = 0;
for (inst = instance_list; inst; inst = inst->next) {
if (inst->flags & FLAG_DONE)
continue;
if (inst->pid <= 0)
continue;
kill(inst->pid, signum);
n++;
}
return n;
}
/*
* Wait for one child process to exit; when it does, unlink it from
* the list of executing child processes, and return it.
*/
static struct fsck_instance *wait_one(int flags)
{
int status = 0;
int sig;
struct fsck_instance *inst, *inst2, *prev;
pid_t pid;
struct rusage rusage;
if (!instance_list)
return NULL;
if (noexecute) {
inst = instance_list;
prev = NULL;
#ifdef RANDOM_DEBUG
while (inst->next && (random() & 1)) {
prev = inst;
inst = inst->next;
}
#endif
inst->exit_status = 0;
goto ret_inst;
}
/*
* gcc -Wall fails saving throw against stupidity
* (inst and prev are thought to be uninitialized variables)
*/
inst = prev = NULL;
do {
pid = wait4(-1, &status, flags, &rusage);
if (cancel_requested && !kill_sent) {
kill_all(SIGTERM);
kill_sent++;
}
if ((pid == 0) && (flags & WNOHANG))
return NULL;
if (pid < 0) {
if ((errno == EINTR) || (errno == EAGAIN))
continue;
if (errno == ECHILD) {
warnx(_("wait: no more child process?!?"));
return NULL;
}
warn(_("waitpid failed"));
continue;
}
for (prev = NULL, inst = instance_list;
inst;
prev = inst, inst = inst->next) {
if (inst->pid == pid)
break;
}
} while (!inst);
if (WIFEXITED(status))
status = WEXITSTATUS(status);
else if (WIFSIGNALED(status)) {
sig = WTERMSIG(status);
if (sig == SIGINT) {
status = FSCK_EX_UNCORRECTED;
} else {
warnx(_("Warning... %s for device %s exited "
"with signal %d."),
inst->prog, fs_get_device(inst->fs), sig);
status = FSCK_EX_ERROR;
}
} else {
warnx(_("%s %s: status is %x, should never happen."),
inst->prog, fs_get_device(inst->fs), status);
status = FSCK_EX_ERROR;
}
inst->exit_status = status;
inst->flags |= FLAG_DONE;
gettime_monotonic(&inst->end_time);
memcpy(&inst->rusage, &rusage, sizeof(struct rusage));
if (progress && (inst->flags & FLAG_PROGRESS) &&
!progress_active()) {
for (inst2 = instance_list; inst2; inst2 = inst2->next) {
if (inst2->flags & FLAG_DONE)
continue;
if (strcmp(inst2->type, "ext2") != 0 &&
strcmp(inst2->type, "ext3") &&
strcmp(inst2->type, "ext4") != 0 &&
strcmp(inst2->type, "ext4dev") != 0)
continue;
/*
* If we've just started the fsck, wait a tiny
* bit before sending the kill, to give it
* time to set up the signal handler
*/
if (inst2->start_time.tv_sec < time(NULL) + 2) {
if (fork() == 0) {
sleep(1);
kill(inst2->pid, SIGUSR1);
exit(FSCK_EX_OK);
}
} else
kill(inst2->pid, SIGUSR1);
inst2->flags |= FLAG_PROGRESS;
break;
}
}
ret_inst:
if (prev)
prev->next = inst->next;
else
instance_list = inst->next;
print_stats(inst);
if (verbose > 1)
printf(_("Finished with %s (exit status %d)\n"),
fs_get_device(inst->fs), inst->exit_status);
num_running--;
return inst;
}
#define FLAG_WAIT_ALL 0
#define FLAG_WAIT_ATLEAST_ONE 1
/*
* Wait until all executing child processes have exited; return the
* logical OR of all of their exit code values.
*/
static int wait_many(int flags)
{
struct fsck_instance *inst;
int global_status = 0;
int wait_flags = 0;
while ((inst = wait_one(wait_flags))) {
global_status |= inst->exit_status;
free_instance(inst);
#ifdef RANDOM_DEBUG
if (noexecute && (flags & WNOHANG) && !(random() % 3))
break;
#endif
if (flags & FLAG_WAIT_ATLEAST_ONE)
wait_flags = WNOHANG;
}
return global_status;
}
/*
* Run the fsck program on a particular device
*
* If the type is specified using -t, and it isn't prefixed with "no"
* (as in "noext2") and only one filesystem type is specified, then
* use that type regardless of what is specified in /etc/fstab.
*
* If the type isn't specified by the user, then use either the type
* specified in /etc/fstab, or DEFAULT_FSTYPE.
*/
static int fsck_device(struct libmnt_fs *fs, int interactive)
{
char *progname, *progpath;
const char *type;
int retval;
fs_interpret_type(fs);
type = mnt_fs_get_fstype(fs);
if (type && strcmp(type, "auto") != 0)
;
else if (fstype && strncmp(fstype, "no", 2) != 0 &&
strncmp(fstype, "opts=", 5) != 0 && strncmp(fstype, "loop", 4) != 0 &&
!strchr(fstype, ','))
type = fstype;
else
type = DEFAULT_FSTYPE;
xasprintf(&progname, "fsck.%s", type);
if (!find_fsck(progname, &progpath)) {
free(progname);
if (fs_check_required(type)) {
retval = ENOENT;
goto err;
}
return 0;
}
num_running++;
retval = execute(progname, progpath, type, fs, interactive);
free(progname);
free(progpath);
if (retval) {
num_running--;
goto err;
}
return 0;
err:
warnx(_("error %d (%s) while executing fsck.%s for %s"),
retval, strerror(errno), type, fs_get_device(fs));
return FSCK_EX_ERROR;
}
/*
* Deal with the fsck -t argument.
*/
static struct fs_type_compile {
char **list;
int *type;
int negate;
} fs_type_compiled;
#define FS_TYPE_NORMAL 0
#define FS_TYPE_OPT 1
#define FS_TYPE_NEGOPT 2
static void compile_fs_type(char *fs_type, struct fs_type_compile *cmp)
{
char *cp, *list, *s;
int num = 2;
int negate, first_negate = 1;
if (fs_type) {
for (cp=fs_type; *cp; cp++) {
if (*cp == ',')
num++;
}
}
cmp->list = xcalloc(num, sizeof(char *));
cmp->type = xcalloc(num, sizeof(int));
cmp->negate = 0;
if (!fs_type)
return;
list = xstrdup(fs_type);
num = 0;
s = strtok(list, ",");
while(s) {
negate = 0;
if (strncmp(s, "no", 2) == 0) {
s += 2;
negate = 1;
} else if (*s == '!') {
s++;
negate = 1;
}
if (strcmp(s, "loop") == 0)
/* loop is really short-hand for opts=loop */
goto loop_special_case;
else if (strncmp(s, "opts=", 5) == 0) {
s += 5;
loop_special_case:
cmp->type[num] = negate ? FS_TYPE_NEGOPT : FS_TYPE_OPT;
} else {
if (first_negate) {
cmp->negate = negate;
first_negate = 0;
}
if ((negate && !cmp->negate) ||
(!negate && cmp->negate)) {
errx(FSCK_EX_USAGE,
_("Either all or none of the filesystem types passed to -t must be prefixed\n"
"with 'no' or '!'."));
}
}
cmp->list[num++] = xstrdup(s);
s = strtok(NULL, ",");
}
free(list);
}
/*
* This function returns true if a particular option appears in a
* comma-delimited options list
*/
static int opt_in_list(const char *opt, const char *optlist)
{
char *list, *s;
if (!optlist)
return 0;
list = xstrdup(optlist);
s = strtok(list, ",");
while(s) {
if (strcmp(s, opt) == 0) {
free(list);
return 1;
}
s = strtok(NULL, ",");
}
free(list);
return 0;
}
/* See if the filesystem matches the criteria given by the -t option */
static int fs_match(struct libmnt_fs *fs, struct fs_type_compile *cmp)
{
int n, ret = 0, checked_type = 0;
char *cp;
if (cmp->list == NULL || cmp->list[0] == NULL)
return 1;
for (n=0; (cp = cmp->list[n]); n++) {
switch (cmp->type[n]) {
case FS_TYPE_NORMAL:
{
const char *type = mnt_fs_get_fstype(fs);
checked_type++;
if (type && strcmp(cp, type) == 0)
ret = 1;
break;
}
case FS_TYPE_NEGOPT:
if (opt_in_list(cp, mnt_fs_get_options(fs)))
return 0;
break;
case FS_TYPE_OPT:
if (!opt_in_list(cp, mnt_fs_get_options(fs)))
return 0;
break;
}
}
if (checked_type == 0)
return 1;
return (cmp->negate ? !ret : ret);
}
/*
* Check if a device exists
*/
static int device_exists(const char *device)
{
struct stat st;
if (stat(device, &st) == -1)
return 0;
if (!S_ISBLK(st.st_mode))
return 0;
return 1;
}
static int fs_ignored_type(struct libmnt_fs *fs)
{
const char **ip, *type;
if (!mnt_fs_is_regularfs(fs))
return 1;
type = mnt_fs_get_fstype(fs);
for(ip = ignored_types; type && *ip; ip++) {
if (strcmp(type, *ip) == 0)
return 1;
}
return 0;
}
/* Check if we should ignore this filesystem. */
static int ignore(struct libmnt_fs *fs)
{
const char *type;
/*
* If the pass number is 0, ignore it.
*/
if (mnt_fs_get_passno(fs) == 0)
return 1;
/*
* If this is a bind mount, ignore it.
*/
if (opt_in_list("bind", mnt_fs_get_options(fs))) {
warnx(_("%s: skipping bad line in /etc/fstab: "
"bind mount with nonzero fsck pass number"),
mnt_fs_get_target(fs));
return 1;
}
/*
* ignore devices that don't exist and have the "nofail" mount option
*/
if (!device_exists(fs_get_device(fs))) {
if (opt_in_list("nofail", mnt_fs_get_options(fs))) {
if (verbose)
printf(_("%s: skipping nonexistent device\n"),
fs_get_device(fs));
return 1;
}
if (verbose)
printf(_("%s: nonexistent device (\"nofail\" fstab "
"option may be used to skip this device)\n"),
fs_get_device(fs));
}
fs_interpret_type(fs);
/*
* If a specific fstype is specified, and it doesn't match,
* ignore it.
*/
if (!fs_match(fs, &fs_type_compiled))
return 1;
type = mnt_fs_get_fstype(fs);
if (!type) {
if (verbose)
printf(_("%s: skipping unknown filesystem type\n"),
fs_get_device(fs));
return 1;
}
/* Are we ignoring this type? */
if (fs_ignored_type(fs))
return 1;
/* See if the <fsck.fs> program is available. */
if (!find_fsck(type, NULL)) {
if (fs_check_required(type))
warnx(_("cannot check %s: fsck.%s not found"),
fs_get_device(fs), type);
return 1;
}
/* We can and want to check this file system type. */
return 0;
}
static int count_slaves(dev_t disk)
{
DIR *dir;
struct dirent *dp;
char dirname[PATH_MAX];
int count = 0;
snprintf(dirname, sizeof(dirname),
"/sys/dev/block/%u:%u/slaves/",
major(disk), minor(disk));
if (!(dir = opendir(dirname)))
return -1;
while ((dp = readdir(dir)) != NULL) {
#ifdef _DIRENT_HAVE_D_TYPE
if (dp->d_type != DT_UNKNOWN && dp->d_type != DT_LNK)
continue;
#endif
if (dp->d_name[0] == '.' &&
((dp->d_name[1] == 0) ||
((dp->d_name[1] == '.') && (dp->d_name[2] == 0))))
continue;
count++;
}
closedir(dir);
return count;
}
/*
* Returns TRUE if a partition on the same disk is already being
* checked.
*/
static int disk_already_active(struct libmnt_fs *fs)
{
struct fsck_instance *inst;
dev_t disk;
if (force_all_parallel)
return 0;
if (instance_list && fs_is_stacked(instance_list->fs))
/* any instance for a stacked device is already running */
return 1;
disk = fs_get_disk(fs, 1);
/*
* If we don't know the base device, assume that the device is
* already active if there are any fsck instances running.
*
* Don't check a stacked device with any other disk too.
*/
if (!disk || fs_is_stacked(fs))
return (instance_list != NULL);
for (inst = instance_list; inst; inst = inst->next) {
dev_t idisk = fs_get_disk(inst->fs, 0);
if (!idisk || disk == idisk)
return 1;
}
return 0;
}
/* Check all file systems, using the /etc/fstab table. */
static int check_all(void)
{
int not_done_yet = 1;
int passno = 1;
int pass_done;
int status = FSCK_EX_OK;
struct libmnt_fs *fs;
struct libmnt_iter *itr = mnt_new_iter(MNT_ITER_FORWARD);
if (!itr)
err(FSCK_EX_ERROR, _("failed to allocate iterator"));
/*
* Do an initial scan over the filesystem; mark filesystems
* which should be ignored as done, and resolve any "auto"
* filesystem types (done as a side-effect of calling ignore()).
*/
while (mnt_table_next_fs(fstab, itr, &fs) == 0) {
if (ignore(fs)) {
fs_set_done(fs);
continue;
}
}
if (verbose)
fputs(_("Checking all file systems.\n"), stdout);
/*
* Find and check the root filesystem.
*/
if (!parallel_root) {
fs = mnt_table_find_target(fstab, "/", MNT_ITER_FORWARD);
if (fs) {
if (!skip_root &&
!fs_is_done(fs) &&
!(ignore_mounted && is_mounted(fs))) {
status |= fsck_device(fs, 1);
status |= wait_many(FLAG_WAIT_ALL);
if (status > FSCK_EX_NONDESTRUCT) {
mnt_free_iter(itr);
return status;
}
}
fs_set_done(fs);
}
}
/*
* This is for the bone-headed user who enters the root
* filesystem twice. Skip root will skip all root entries.
*/
if (skip_root) {
mnt_reset_iter(itr, MNT_ITER_FORWARD);
while(mnt_table_next_fs(fstab, itr, &fs) == 0) {
const char *tgt = mnt_fs_get_target(fs);
if (tgt && strcmp(tgt, "/") == 0)
fs_set_done(fs);
}
}
while (not_done_yet) {
not_done_yet = 0;
pass_done = 1;
mnt_reset_iter(itr, MNT_ITER_FORWARD);
while(mnt_table_next_fs(fstab, itr, &fs) == 0) {
if (cancel_requested)
break;
if (fs_is_done(fs))
continue;
/*
* If the filesystem's pass number is higher
* than the current pass number, then we don't
* do it yet.
*/
if (mnt_fs_get_passno(fs) > passno) {
not_done_yet++;
continue;
}
if (ignore_mounted && is_mounted(fs)) {
fs_set_done(fs);
continue;
}
/*
* If a filesystem on a particular device has
* already been spawned, then we need to defer
* this to another pass.
*/
if (disk_already_active(fs)) {
pass_done = 0;
continue;
}
/*
* Spawn off the fsck process
*/
status |= fsck_device(fs, serialize);
fs_set_done(fs);
/*
* Only do one filesystem at a time, or if we
* have a limit on the number of fsck's extant
* at one time, apply that limit.
*/
if (serialize ||
(max_running && (num_running >= max_running))) {
pass_done = 0;
break;
}
}
if (cancel_requested)
break;
if (verbose > 1)
printf(_("--waiting-- (pass %d)\n"), passno);
status |= wait_many(pass_done ? FLAG_WAIT_ALL :
FLAG_WAIT_ATLEAST_ONE);
if (pass_done) {
if (verbose > 1)
printf("----------------------------------\n");
passno++;
} else
not_done_yet++;
}
if (cancel_requested && !kill_sent) {
kill_all(SIGTERM);
kill_sent++;
}
status |= wait_many(FLAG_WAIT_ATLEAST_ONE);
mnt_free_iter(itr);
return status;
}
static void __attribute__((__noreturn__)) usage(void)
{
FILE *out = stdout;
fputs(USAGE_HEADER, out);
fprintf(out, _(" %s [options] -- [fs-options] [<filesystem> ...]\n"),
program_invocation_short_name);
fputs(USAGE_SEPARATOR, out);
fputs(_("Check and repair a Linux filesystem.\n"), out);
fputs(USAGE_OPTIONS, out);
fputs(_(" -A check all filesystems\n"), out);
fputs(_(" -C [<fd>] display progress bar; file descriptor is for GUIs\n"), out);
fputs(_(" -l lock the device to guarantee exclusive access\n"), out);
fputs(_(" -M do not check mounted filesystems\n"), out);
fputs(_(" -N do not execute, just show what would be done\n"), out);
fputs(_(" -P check filesystems in parallel, including root\n"), out);
fputs(_(" -R skip root filesystem; useful only with '-A'\n"), out);
fputs(_(" -r [<fd>] report statistics for each device checked;\n"
" file descriptor is for GUIs\n"), out);
fputs(_(" -s serialize the checking operations\n"), out);
fputs(_(" -T do not show the title on startup\n"), out);
fputs(_(" -t <type> specify filesystem types to be checked;\n"
" <type> is allowed to be a comma-separated list\n"), out);
fputs(_(" -V explain what is being done\n"), out);
fputs(USAGE_SEPARATOR, out);
printf( " -?, --help %s\n", USAGE_OPTSTR_HELP);
printf( " --version %s\n", USAGE_OPTSTR_VERSION);
fputs(USAGE_SEPARATOR, out);
fputs(_("See the specific fsck.* commands for available fs-options."), out);
printf(USAGE_MAN_TAIL("fsck(8)"));
exit(FSCK_EX_OK);
}
static void signal_cancel(int sig __attribute__((__unused__)))
{
cancel_requested++;
}
static void parse_argv(int argc, char *argv[])
{
int i, j;
char *arg, *dev, *tmp = NULL;
char options[128];
int opt = 0;
int opts_for_fsck = 0;
struct sigaction sa;
int report_stats_fd = -1;
/*
* Set up signal action
*/
memset(&sa, 0, sizeof(struct sigaction));
sa.sa_handler = signal_cancel;
sigaction(SIGINT, &sa, NULL);
sigaction(SIGTERM, &sa, NULL);
num_devices = 0;
num_args = 0;
instance_list = NULL;
for (i=1; i < argc; i++) {
arg = argv[i];
if (!arg)
continue;
/* the only two longopts to satisfy UL standards */
if (!opts_for_fsck && !strcmp(arg, "--help"))
usage();
if (!opts_for_fsck && !strcmp(arg, "--version"))
print_version(FSCK_EX_OK);
if ((arg[0] == '/' && !opts_for_fsck) || strchr(arg, '=')) {
if (num_devices >= MAX_DEVICES)
errx(FSCK_EX_ERROR, _("too many devices"));
dev = mnt_resolve_spec(arg, mntcache);
if (!dev && strchr(arg, '=')) {
/*
* Check to see if we failed because
* /proc/partitions isn't found.
*/
if (access(_PATH_PROC_PARTITIONS, R_OK) < 0) {
warn(_("cannot open %s"),
_PATH_PROC_PARTITIONS);
errx(FSCK_EX_ERROR, _("Is /proc mounted?"));
}
/*
* Check to see if this is because
* we're not running as root
*/
if (geteuid())
errx(FSCK_EX_ERROR,
_("must be root to scan for matching filesystems: %s"),
arg);
else
errx(FSCK_EX_ERROR,
_("couldn't find matching filesystem: %s"),
arg);
}
devices[num_devices++] = dev ? dev : xstrdup(arg);
continue;
}
if (arg[0] != '-' || opts_for_fsck) {
if (num_args >= MAX_ARGS)
errx(FSCK_EX_ERROR, _("too many arguments"));
args[num_args++] = xstrdup(arg);
continue;
}
for (j=1; arg[j]; j++) {
if (opts_for_fsck) {
options[++opt] = arg[j];
continue;
}
switch (arg[j]) {
case 'A':
doall = 1;
break;
case 'C':
progress = 1;
if (arg[j+1]) { /* -C<fd> */
progress_fd = string_to_int(arg+j+1);
if (progress_fd < 0)
progress_fd = 0;
else
goto next_arg;
} else if (i+1 < argc && *argv[i+1] != '-') { /* -C <fd> */
progress_fd = string_to_int(argv[i+1]);
if (progress_fd < 0)
progress_fd = 0;
else {
++i;
goto next_arg;
}
}
break;
case 'l':
lockdisk = 1;
break;
case 'V':
verbose++;
break;
case 'N':
noexecute = 1;
break;
case 'R':
skip_root = 1;
break;
case 'T':
notitle = 1;
break;
case 'M':
ignore_mounted = 1;
break;
case 'P':
parallel_root = 1;
break;
case 'r':
report_stats = 1;
if (arg[j+1]) { /* -r<fd> */
report_stats_fd = strtou32_or_err(arg+j+1, _("invalid argument of -r"));
goto next_arg;
} else if (i+1 < argc && *argv[i+1] >= '0' && *argv[i+1] <= '9') { /* -r <fd> */
report_stats_fd = strtou32_or_err(argv[i+1], _("invalid argument of -r"));
++i;
goto next_arg;
}
break;
case 's':
serialize = 1;
break;
case 't':
tmp = NULL;
if (fstype)
errx(FSCK_EX_USAGE,
_("option '%s' may be specified only once"), "-t");
if (arg[j+1])
tmp = arg+j+1;
else if ((i+1) < argc)
tmp = argv[++i];
else
errx(FSCK_EX_USAGE,
_("option '%s' requires an argument"), "-t");
fstype = xstrdup(tmp);
compile_fs_type(fstype, &fs_type_compiled);
goto next_arg;
case '-':
opts_for_fsck++;
break;
case '?':
usage();
break;
default:
options[++opt] = arg[j];
break;
}
}
next_arg:
if (opt) {
options[0] = '-';
options[++opt] = '\0';
if (num_args >= MAX_ARGS)
errx(FSCK_EX_ERROR, _("too many arguments"));
args[num_args++] = xstrdup(options);
opt = 0;
}
}
/* Validate the report stats file descriptor to avoid disasters */
if (report_stats_fd >= 0) {
report_stats_file = fdopen(report_stats_fd, "w");
if (!report_stats_file)
err(FSCK_EX_ERROR,
_("invalid argument of -r: %d"),
report_stats_fd);
}
if (getenv("FSCK_FORCE_ALL_PARALLEL"))
force_all_parallel++;
if (ul_strtos32(getenv("FSCK_MAX_INST"), &max_running, 10) != 0)
max_running = 0;
}
int main(int argc, char *argv[])
{
int i, status = 0;
int interactive = 0;
struct libmnt_fs *fs;
const char *path = getenv("PATH");
setvbuf(stdout, NULL, _IONBF, BUFSIZ);
setvbuf(stderr, NULL, _IONBF, BUFSIZ);
setlocale(LC_MESSAGES, "");
setlocale(LC_CTYPE, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
close_stdout_atexit();
strutils_set_exitcode(FSCK_EX_USAGE);
mnt_init_debug(0); /* init libmount debug mask */
mntcache = mnt_new_cache(); /* no fatal error if failed */
parse_argv(argc, argv);
if (!notitle)
printf(UTIL_LINUX_VERSION);
signal(SIGCHLD, SIG_DFL); /* clear any inherited settings */
load_fs_info();
fsck_path = xstrdup(path && *path ? path : FSCK_DEFAULT_PATH);
if ((num_devices == 1) || (serialize))
interactive = 1;
if (lockdisk && (doall || num_devices > 1)) {
warnx(_("the -l option can be used with one "
"device only -- ignore"));
lockdisk = 0;
}
/* If -A was specified ("check all"), do that! */
if (doall)
return check_all();
if (num_devices == 0) {
serialize++;
interactive++;
return check_all();
}
for (i = 0 ; i < num_devices; i++) {
if (cancel_requested) {
if (!kill_sent) {
kill_all(SIGTERM);
kill_sent++;
}
break;
}
fs = lookup(devices[i]);
if (!fs)
fs = add_dummy_fs(devices[i]);
else if (fs_ignored_type(fs))
continue;
if (ignore_mounted && is_mounted(fs))
continue;
status |= fsck_device(fs, interactive);
if (serialize ||
(max_running && (num_running >= max_running))) {
struct fsck_instance *inst;
inst = wait_one(0);
if (inst) {
status |= inst->exit_status;
free_instance(inst);
}
if (verbose > 1)
printf("----------------------------------\n");
}
}
status |= wait_many(FLAG_WAIT_ALL);
free(fsck_path);
mnt_unref_cache(mntcache);
mnt_unref_table(fstab);
mnt_unref_table(mtab);
return status;
}
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