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e2fsprogs
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e2fsprogs/misc/fsck.c

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/*
* pfsck --- 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>
*
* Usage: fsck [-AVRNTM] [-s] [-t fstype] [fs-options] device
*
* 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 Theodore Ts'o.
*
* %Begin-Header%
* This file may be redistributed under the terms of the GNU Public
* License.
* %End-Header%
*/
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/signal.h>
#include <sys/stat.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#if HAVE_STDLIB_H
#include <stdlib.h>
#endif
#if HAVE_ERRNO_H
#include <errno.h>
#endif
#if HAVE_MNTENT_H
#include <mntent.h>
#endif
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_ERRNO_H
#include <errno.h>
#endif
#include <malloc.h>
#ifdef HAVE_GETOPT_H
#include <getopt.h>
#endif
#include "../version.h"
#include "fsck.h"
static const char *ignored_types[] = {
"ignore",
"iso9660",
"nfs",
"proc",
"sw",
"swap",
NULL
};
static const char *really_wanted[] = {
"minix",
"ext2",
"xiafs",
NULL
};
#ifdef DEV_DSK_DEVICES
static const char *base_devices[] = {
"/dev/dsk/hda",
"/dev/dsk/hdb",
"/dev/dsk/hdc",
"/dev/dsk/hdd",
"/dev/dsk/hd1a",
"/dev/dsk/hd1b",
"/dev/dsk/hd1c",
"/dev/dsk/hd1d",
"/dev/dsk/sda",
"/dev/dsk/sdb",
"/dev/dsk/sdc",
"/dev/dsk/sdd",
"/dev/dsk/sde",
"/dev/dsk/sdf",
"/dev/dsk/sdg",
NULL
};
#else
static const char *base_devices[] = {
"/dev/hda",
"/dev/hdb",
"/dev/hdc",
"/dev/hdd",
"/dev/hd1a",
"/dev/hd1b",
"/dev/hd1c",
"/dev/hd1d",
"/dev/sda",
"/dev/sdb",
"/dev/sdc",
"/dev/sdd",
"/dev/sde",
"/dev/sdf",
"/dev/sdg",
NULL
};
#endif
/*
* Global variables for options
*/
char *devices[MAX_DEVICES];
char *args[MAX_ARGS];
int num_devices, num_args;
int verbose = 0;
int doall = 0;
int noexecute = 0;
int serialize = 0;
int skip_root = 0;
int like_mount = 0;
int notitle = 0;
int parallel_root = 0;
char *progname;
char *fstype = NULL;
struct fs_info *filesys_info;
struct fsck_instance *instance_list;
const char *fsck_prefix_path = "/sbin:/sbin/fs.d:/sbin/fs:/etc/fs:/etc";
char *fsck_path = 0;
static int ignore(struct fs_info *);
#ifdef HAVE_STRDUP
#ifdef _POSIX_SOURCE
extern char *strdup(const char *s);
#endif
#else
static char *strdup(const char *s)
{
char *ret;
ret = malloc(strlen(s)+1);
if (ret)
strcpy(ret, s);
return ret;
}
#endif
static void free_instance(struct fsck_instance *i)
{
if (i->prog)
free(i->prog);
if (i->device)
free(i->device);
free(i);
return;
}
/*
* Load the filesystem database from /etc/fstab
*/
static void load_fs_info(NOARGS)
{
#if HAVE_MNTENT_H
FILE *mntfile;
struct mntent *mp;
struct fs_info *fs;
struct fs_info *fs_last = NULL;
int old_fstab = 1;
filesys_info = NULL;
/* Open the mount table. */
if ((mntfile = setmntent(MNTTAB, "r")) == NULL) {
perror(MNTTAB);
exit(EXIT_ERROR);
}
while ((mp = getmntent(mntfile)) != NULL) {
fs = malloc(sizeof(struct fs_info));
memset(fs, 0, sizeof(struct fs_info));
fs->device = strdup(mp->mnt_fsname);
fs->mountpt = strdup(mp->mnt_dir);
fs->type = strdup(mp->mnt_type);
fs->opts = strdup(mp->mnt_opts);
fs->freq = mp->mnt_freq;
fs->passno = mp->mnt_passno;
fs->next = NULL;
if (!filesys_info)
filesys_info = fs;
else
fs_last->next = fs;
fs_last = fs;
if (fs->passno)
old_fstab = 0;
}
(void) endmntent(mntfile);
if (old_fstab) {
fprintf(stderr, "\007\007\007"
"WARNING: Your /etc/fstab does not contain the fsck passno\n");
fprintf(stderr,
" field. I will kludge around things for you, but you\n");
fprintf(stderr,
" should fix your /etc/fstab file as soon as you can.\n\n");
for (fs = filesys_info; fs; fs = fs->next) {
fs->passno = 1;
}
}
#else
filesys_info = NULL;
#endif /* HAVE_MNTENT_H */
}
/* Lookup filesys in /etc/fstab and return the corresponding entry. */
static struct fs_info *lookup(char *filesys)
{
struct fs_info *fs;
/* No filesys name given. */
if (filesys == NULL)
return NULL;
for (fs = filesys_info; fs; fs = fs->next) {
if (!strcmp(filesys, fs->device) ||
!strcmp(filesys, fs->mountpt))
break;
}
return fs;
}
/* Find fsck program for a given fs type. */
static char *find_fsck(char *type)
{
char *s;
const char *tpl;
static char prog[256];
char *p = strdup(fsck_path);
struct stat st;
/* 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, ":")) {
sprintf(prog, tpl, s, type);
if (stat(prog, &st) == 0) break;
}
free(p);
return(s ? prog : NULL);
}
/*
* Execute a particular fsck program, and link it into the list of
* child processes we are waiting for.
*/
static int execute(char *prog, char *device)
{
char *s, *argv[80];
int argc, i;
struct fsck_instance *inst;
pid_t pid;
argv[0] = strdup(prog);
argc = 1;
for (i=0; i <num_args; i++)
argv[argc++] = strdup(args[i]);
argv[argc++] = strdup(device);
argv[argc] = 0;
s = find_fsck(prog);
if (s == NULL) {
fprintf(stderr, "fsck: %s: not found\n", prog);
return ENOENT;
}
if (verbose || noexecute) {
printf("[%s] ", s);
for (i=0; i < argc; i++)
printf("%s ", argv[i]);
printf("\n");
}
if (noexecute)
return 0;
/* Fork and execute the correct program. */
if ((pid = fork()) < 0) {
perror("fork");
return errno;
} else if (pid == 0) {
(void) execv(s, argv);
perror(argv[0]);
exit(EXIT_ERROR);
}
inst = malloc(sizeof(struct fsck_instance));
if (!inst)
return ENOMEM;
memset(inst, 0, sizeof(struct fsck_instance));
inst->pid = pid;
inst->prog = strdup(prog);
inst->device = strdup(device);
inst->next = instance_list;
instance_list = inst;
return 0;
}
/*
* 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(NOARGS)
{
int status;
int sig;
struct fsck_instance *inst, *prev;
pid_t pid;
if (!instance_list)
return NULL;
retry:
pid = wait(&status);
if (pid < 0) {
if ((errno == EINTR) || (errno == EAGAIN))
goto retry;
if (errno == ECHILD) {
fprintf(stderr,
"%s: wait: No more child process?!?\n",
progname);
return NULL;
}
perror("wait");
goto retry;
}
for (prev = 0, inst = instance_list;
inst;
prev = inst, inst = inst->next) {
if (inst->pid == pid)
break;
}
if (!inst) {
printf("Unexpected child process %d, status = 0x%x\n",
pid, status);
goto retry;
}
if (WIFEXITED(status))
status = WEXITSTATUS(status);
else if (WIFSIGNALED(status)) {
sig = WTERMSIG(status);
if (sig == SIGINT) {
status = EXIT_UNCORRECTED;
} else {
printf("Warning... %s for device %s exited "
"with signal %d.\n",
inst->prog, inst->device, sig);
status = EXIT_ERROR;
}
} else {
printf("%s %s: status is %x, should never happen.\n",
inst->prog, inst->device, status);
status = EXIT_ERROR;
}
inst->exit_status = status;
if (prev)
prev->next = inst->next;
else
instance_list = inst->next;
return inst;
}
/*
* Wait until all executing child processes have exited; return the
* logical OR of all of their exit code values.
*/
static int wait_all(NOARGS)
{
struct fsck_instance *inst;
int global_status = 0;
while (instance_list) {
inst = wait_one();
if (!inst)
break;
global_status |= inst->exit_status;
free_instance(inst);
}
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 void fsck_device(char *device)
{
const char *type = 0;
struct fs_info *fsent;
int retval;
char prog[80];
if (fstype && strncmp(fstype, "no", 2) && !strchr(fstype, ','))
type = fstype;
if ((fsent = lookup(device))) {
device = fsent->device;
if (!type)
type = fsent->type;
}
if (!type)
type = DEFAULT_FSTYPE;
sprintf(prog, "fsck.%s", type);
retval = execute(prog, device);
if (retval) {
fprintf(stderr, "%s: Error %d while executing %s for %s\n",
progname, retval, prog, device);
}
}
/* See if filesystem type matches the list. */
static int fs_match(char *type, char *fs_type)
{
int ret = 0, negate = 0;
char list[128];
char *s;
if (!fs_type) return(1);
if (strncmp(fs_type, "no", 2) == 0) {
fs_type += 2;
negate = 1;
}
strcpy(list, fs_type);
s = strtok(list, ",");
while(s) {
if (strcmp(s, type) == 0) {
ret = 1;
break;
}
s = strtok(NULL, ",");
}
return(negate ? !ret : ret);
}
/* Check if we should ignore this filesystem. */
static int ignore(struct fs_info *fs)
{
const char *cp;
const char **ip;
int wanted = 0;
/*
* If the pass number is 0, ignore it.
*/
if (fs->passno == 0)
return 1;
/*
* If a specific fstype is specified, and it doesn't match,
* ignore it.
*/
if (!fs_match(fs->type, fstype)) return 1;
/* Noauto never matches. */
for (cp = strtok(fs->opts, ","); cp != NULL; cp = strtok(NULL, ",")) {
if (!strcmp(cp, "noauto"))
return 1;
}
/* Are we ignoring this type? */
for(ip = ignored_types; *ip; ip++)
if (strcmp(fs->type, *ip) == 0) return(1);
/* Do we really really want to check this fs? */
for(ip = really_wanted; *ip; ip++)
if (strcmp(fs->type, *ip) == 0) {
wanted = 1;
break;
}
/* See if the <fsck.fs> program is available. */
if (find_fsck(fs->type) == NULL) {
if (wanted)
fprintf(stderr, "fsck: cannot check %s: fsck.%s not found\n",
fs->device, fs->type);
return(1);
}
/* We can and want to check this file system type. */
return 0;
}
/*
* Return the "base device" given a particular device; this is used to
* assure that we only fsck one partition on a particular drive at any
* one time. Otherwise, the disk heads will be seeking all over the
* place.
*/
static const char *base_device(char *device)
{
const char **base;
for (base = base_devices; *base; base++) {
if (!strncmp(*base, device, strlen(*base)))
return *base;
}
return device;
}
/*
* Returns TRUE if a partition on the same disk is already being
* checked.
*/
static int device_already_active(char *device)
{
struct fsck_instance *inst;
const char *base;
base = base_device(device);
for (inst = instance_list; inst; inst = inst->next) {
if (!strcmp(base, base_device(inst->device)))
return 1;
}
return 0;
}
/* Check all file systems, using the /etc/fstab table. */
static int check_all(NOARGS)
{
struct fs_info *fs = NULL;
struct fsck_instance *inst;
int status = EXIT_OK;
int not_done_yet = 1;
int passno = 0;
int pass_done;
if (verbose)
printf("Checking all file systems.\n");
/*
* Find and check the root filesystem first.
*/
if (!parallel_root) {
for (fs = filesys_info; fs; fs = fs->next) {
if (!strcmp(fs->mountpt, "/"))
break;
}
if (fs && !skip_root && !ignore(fs)) {
fsck_device(fs->device);
fs->flags |= FLAG_DONE;
status |= wait_all();
if (status > EXIT_NONDESTRUCT)
return status;
}
}
if (fs) fs->flags |= FLAG_DONE;
/*
* Mark filesystems that should be ignored as done.
*/
for (fs = filesys_info; fs; fs = fs->next) {
if (ignore(fs))
fs->flags |= FLAG_DONE;
}
while (not_done_yet) {
not_done_yet = 0;
pass_done = 1;
for (fs = filesys_info; fs; fs = fs->next) {
if (fs->flags & FLAG_DONE)
continue;
/*
* If the filesystem's pass number is higher
* than the current pass number, then we don't
* do it yet.
*/
if (fs->passno > passno) {
not_done_yet++;
continue;
}
/*
* If a filesystem on a particular device has
* already been spawned, then we need to defer
* this to another pass.
*/
if (device_already_active(fs->device)) {
pass_done = 0;
continue;
}
/*
* Spawn off the fsck process
*/
fsck_device(fs->device);
fs->flags |= FLAG_DONE;
if (serialize) {
pass_done = 0;
break; /* Only do one filesystem at a time */
}
}
inst = wait_one();
if (inst) {
status |= inst->exit_status;
free_instance(inst);
}
if (pass_done) {
status |= wait_all();
if (verbose)
printf("----------------------------------\n");
passno++;
} else
not_done_yet++;
}
status |= wait_all();
return status;
}
static void usage(NOARGS)
{
fprintf(stderr,
"Usage: fsck [-AV] [-t fstype] [fs-options] filesys\n");
exit(EXIT_USAGE);
}
static void PRS(int argc, char *argv[])
{
int i, j;
char *arg;
char options[128];
int opt = 0;
int opts_for_fsck = 0;
num_devices = 0;
num_args = 0;
instance_list = 0;
progname = argv[0];
load_fs_info();
for (i=1; i < argc; i++) {
arg = argv[i];
if (!arg)
continue;
if (arg[0] == '/') {
if (num_devices >= MAX_DEVICES) {
fprintf(stderr, "%s: too many devices\n",
progname);
exit(1);
}
devices[num_devices++] = strdup(arg);
continue;
}
if (arg[0] != '-') {
if (num_args >= MAX_ARGS) {
fprintf(stderr, "%s: too many arguments\n",
progname);
exit(1);
}
args[num_args++] = strdup(arg);
continue;
}
for (j=1; arg[j]; j++) {
if (opts_for_fsck) {
options[++opt] = arg[j];
continue;
}
switch (arg[j]) {
case 'A':
doall++;
break;
case 'V':
verbose++;
break;
case 'N':
noexecute++;
break;
case 'R':
skip_root++;
break;
case 'T':
notitle++;
break;
case 'M':
like_mount++;
break;
case 'P':
parallel_root++;
break;
case 's':
serialize++;
break;
case 't':
if (arg[j+1]) {
fstype = strdup(arg+j+1);
goto next_arg;
}
if ((i+1) < argc) {
i++;
fstype = strdup(argv[i]);
goto next_arg;
}
usage();
break;
case '-':
opts_for_fsck++;
break;
default:
options[++opt] = arg[j];
break;
}
}
next_arg:
if (opt) {
options[0] = '-';
options[++opt] = '\0';
if (num_args >= MAX_ARGS) {
fprintf(stderr,
"%s: too many arguments\n",
progname);
exit(1);
}
args[num_args++] = strdup(options);
opt = 0;
}
}
}
int main(int argc, char *argv[])
{
int i;
int status = 0;
char *oldpath = getenv("PATH");
PRS(argc, argv);
if (!notitle)
printf("Parallelizing fsck version %s (%s)\n",
E2FSPROGS_VERSION, E2FSPROGS_DATE);
/* Update our search path to include uncommon directories. */
if (oldpath) {
fsck_path = malloc (strlen (fsck_prefix_path) + 1 +
strlen (oldpath) + 1);
strcpy (fsck_path, fsck_prefix_path);
strcat (fsck_path, ":");
strcat (fsck_path, oldpath);
} else {
fsck_path = strdup(fsck_prefix_path);
}
/* If -A was specified ("check all"), do that! */
if (doall)
return check_all();
for (i = 0 ; i < num_devices; i++) {
fsck_device(devices[i]);
if (serialize) {
struct fsck_instance *inst;
inst = wait_one();
if (inst) {
status |= inst->exit_status;
free_instance(inst);
}
}
}
status |= wait_all();
free(fsck_path);
return status;
}
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