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busybox/fsck_minix.c
Erik Andersen fac10d7c59 A few minor updates. ;-) 
Seriously though, read the Changelog for busybox 0.42,
which this is about to become...
 -Erik
2000-02-07 05:29:42 +00:00

1377 lines
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/*
* fsck.c - a file system consistency checker for Linux.
*
* (C) 1991, 1992 Linus Torvalds. This file may be redistributed
* as per the GNU copyleft.
*/
/*
* 09.11.91 - made the first rudimetary functions
*
* 10.11.91 - updated, does checking, no repairs yet.
* Sent out to the mailing-list for testing.
*
* 14.11.91 - Testing seems to have gone well. Added some
* correction-code, and changed some functions.
*
* 15.11.91 - More correction code. Hopefully it notices most
* cases now, and tries to do something about them.
*
* 16.11.91 - More corrections (thanks to Mika Jalava). Most
* things seem to work now. Yeah, sure.
*
*
* 19.04.92 - Had to start over again from this old version, as a
* kernel bug ate my enhanced fsck in february.
*
* 28.02.93 - added support for different directory entry sizes..
*
* Sat Mar 6 18:59:42 1993, faith@cs.unc.edu: Output namelen with
* super-block information
*
* Sat Oct 9 11:17:11 1993, faith@cs.unc.edu: make exit status conform
* to that required by fsutil
*
* Mon Jan 3 11:06:52 1994 - Dr. Wettstein (greg%wind.uucp@plains.nodak.edu)
* Added support for file system valid flag. Also
* added program_version variable and output of
* program name and version number when program
* is executed.
*
* 30.10.94 - added support for v2 filesystem
* (Andreas Schwab, schwab@issan.informatik.uni-dortmund.de)
*
* 10.12.94 - added test to prevent checking of mounted fs adapted
* from Theodore Ts'o's (tytso@athena.mit.edu) e2fsck
* program. (Daniel Quinlan, quinlan@yggdrasil.com)
*
* 01.07.96 - Fixed the v2 fs stuff to use the right #defines and such
* for modern libcs (janl@math.uio.no, Nicolai Langfeldt)
*
* 02.07.96 - Added C bit fiddling routines from rmk@ecs.soton.ac.uk
* (Russell King). He made them for ARM. It would seem
* that the ARM is powerful enough to do this in C whereas
* i386 and m64k must use assembly to get it fast >:-)
* This should make minix fsck systemindependent.
* (janl@math.uio.no, Nicolai Langfeldt)
*
* 04.11.96 - Added minor fixes from Andreas Schwab to avoid compiler
* warnings. Added mc68k bitops from
* Joerg Dorchain <dorchain@mpi-sb.mpg.de>.
*
* 06.11.96 - Added v2 code submitted by Joerg Dorchain, but written by
* Andreas Schwab.
*
* 1999-02-22 Arkadiusz Mi<4D>kiewicz <misiek@misiek.eu.org>
* - added Native Language Support
*
*
* I've had no time to add comments - hopefully the function names
* are comments enough. As with all file system checkers, this assumes
* the file system is quiescent - don't use it on a mounted device
* unless you can be sure nobody is writing to it (and remember that the
* kernel can write to it when it searches for files).
*
* Usuage: fsck [-larvsm] device
* -l for a listing of all the filenames
* -a for automatic repairs (not implemented)
* -r for repairs (interactive) (not implemented)
* -v for verbose (tells how many files)
* -s for super-block info
* -m for minix-like "mode not cleared" warnings
* -f force filesystem check even if filesystem marked as valid
*
* The device may be a block device or a image of one, but this isn't
* enforced (but it's not much fun on a character device :-).
*/
#include "internal.h"
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <ctype.h>
#include <stdlib.h>
#include <termios.h>
#include <mntent.h>
#include <sys/stat.h>
#include <sys/param.h> /* for PATH_MAX */
#include <linux/fs.h>
#include <linux/minix_fs.h>
#ifdef MINIX2_SUPER_MAGIC2
#define HAVE_MINIX2 1
#endif
#ifndef __linux__
#define volatile
#endif
#define ROOT_INO 1
#define UPPER(size,n) ((size+((n)-1))/(n))
#define INODE_SIZE (sizeof(struct minix_inode))
#ifdef HAVE_MINIX2
#define INODE_SIZE2 (sizeof(struct minix2_inode))
#define INODE_BLOCKS UPPER(INODES, (version2 ? MINIX2_INODES_PER_BLOCK \
: MINIX_INODES_PER_BLOCK))
#else
#define INODE_BLOCKS UPPER(INODES, (MINIX_INODES_PER_BLOCK))
#endif
#define INODE_BUFFER_SIZE (INODE_BLOCKS * BLOCK_SIZE)
#define BITS_PER_BLOCK (BLOCK_SIZE<<3)
static char * program_name = "fsck.minix";
static char * program_version = "1.2 - 11/11/96";
static char * device_name = NULL;
static int IN;
static int repair=0, automatic=0, verbose=0, list=0, show=0, warn_mode=0,
force=0;
static int directory=0, regular=0, blockdev=0, chardev=0, links=0,
symlinks=0, total=0;
static int changed = 0; /* flags if the filesystem has been changed */
static int errors_uncorrected = 0; /* flag if some error was not corrected */
static int dirsize = 16;
static int namelen = 14;
static int version2 = 0;
static struct termios termios;
static int termios_set = 0;
/* File-name data */
#define MAX_DEPTH 50
static int name_depth = 0;
static char name_list[MAX_DEPTH][PATH_MAX + 1];
static char * inode_buffer = NULL;
#define Inode (((struct minix_inode *) inode_buffer)-1)
#define Inode2 (((struct minix2_inode *) inode_buffer)-1)
static char super_block_buffer[BLOCK_SIZE];
#define Super (*(struct minix_super_block *)super_block_buffer)
#define INODES ((unsigned long)Super.s_ninodes)
#ifdef HAVE_MINIX2
#define ZONES ((unsigned long)(version2 ? Super.s_zones : Super.s_nzones))
#else
#define ZONES ((unsigned long)(Super.s_nzones))
#endif
#define IMAPS ((unsigned long)Super.s_imap_blocks)
#define ZMAPS ((unsigned long)Super.s_zmap_blocks)
#define FIRSTZONE ((unsigned long)Super.s_firstdatazone)
#define ZONESIZE ((unsigned long)Super.s_log_zone_size)
#define MAXSIZE ((unsigned long)Super.s_max_size)
#define MAGIC (Super.s_magic)
#define NORM_FIRSTZONE (2+IMAPS+ZMAPS+INODE_BLOCKS)
static char *inode_map;
static char *zone_map;
static unsigned char * inode_count = NULL;
static unsigned char * zone_count = NULL;
static void recursive_check(unsigned int ino);
static void recursive_check2(unsigned int ino);
#define inode_in_use(x) (bit(inode_map,(x)))
#define zone_in_use(x) (bit(zone_map,(x)-FIRSTZONE+1))
#define mark_inode(x) (setbit(inode_map,(x)),changed=1)
#define unmark_inode(x) (clrbit(inode_map,(x)),changed=1)
#define mark_zone(x) (setbit(zone_map,(x)-FIRSTZONE+1),changed=1)
#define unmark_zone(x) (clrbit(zone_map,(x)-FIRSTZONE+1),changed=1)
static void leave(int) __attribute__ ((noreturn));
static void leave(int status)
{
if (termios_set)
tcsetattr(0, TCSANOW, &termios);
exit(status);
}
static void show_usage(void) {
fprintf(stderr, "BusyBox v%s (%s) multi-call binary -- GPL2\n\n", BB_VER, BB_BT);
fprintf(stderr, "Usage: %s [-larvsmf] /dev/name\n\n", program_name);
fprintf(stderr, "Performs a consistency check for MINIX filesystems.\n\n");
fprintf(stderr, "OPTIONS:\n");
fprintf(stderr, "\t-l\tLists all filenames\n");
fprintf(stderr, "\t-r\tPerform interactive repairs\n");
fprintf(stderr, "\t-a\tPerform automatic repairs\n");
fprintf(stderr, "\t-v\tverbose\n");
fprintf(stderr, "\t-s\tOutputs super-block information\n");
fprintf(stderr, "\t-m\tActivates MINIX-like \"mode not cleared\" warnings\n");
fprintf(stderr, "\t-f\tForce file system check.\n\n");
leave(16);
}
static void die(const char *str) {
fprintf(stderr, "%s: %s\n", program_name, str);
leave(8);
}
/*
* This simply goes through the file-name data and prints out the
* current file.
*/
static void print_current_name(void)
{
int i=0;
while (i<name_depth)
printf("/%.*s",namelen,name_list[i++]);
if (i == 0)
printf ("/");
}
static int ask(const char * string, int def)
{
int c;
if (!repair) {
printf("\n");
errors_uncorrected = 1;
return 0;
}
if (automatic) {
printf("\n");
if (!def)
errors_uncorrected = 1;
return def;
}
printf(def?"%s (y/n)? ":"%s (n/y)? ",string);
for (;;) {
fflush(stdout);
if ((c=getchar())==EOF) {
if (!def)
errors_uncorrected = 1;
return def;
}
c=toupper(c);
if (c == 'Y') {
def = 1;
break;
} else if (c == 'N') {
def = 0;
break;
} else if (c == ' ' || c == '\n')
break;
}
if (def)
printf("y\n");
else {
printf("n\n");
errors_uncorrected = 1;
}
return def;
}
/*
* Make certain that we aren't checking a filesystem that is on a
* mounted partition. Code adapted from e2fsck, Copyright (C) 1993,
* 1994 Theodore Ts'o. Also licensed under GPL.
*/
static void check_mount(void)
{
FILE * f;
struct mntent * mnt;
int cont;
int fd;
if ((f = setmntent (MOUNTED, "r")) == NULL)
return;
while ((mnt = getmntent (f)) != NULL)
if (strcmp (device_name, mnt->mnt_fsname) == 0)
break;
endmntent (f);
if (!mnt)
return;
/*
* If the root is mounted read-only, then /etc/mtab is
* probably not correct; so we won't issue a warning based on
* it.
*/
fd = open(MOUNTED, O_RDWR);
if (fd < 0 && errno == EROFS)
return;
else
close(fd);
printf ("%s is mounted. ", device_name);
if (isatty(0) && isatty(1))
cont = ask("Do you really want to continue", 0);
else
cont = 0;
if (!cont) {
printf ("check aborted.\n");
exit (0);
}
return;
}
/*
* check_zone_nr checks to see that *nr is a valid zone nr. If it
* isn't, it will possibly be repaired. Check_zone_nr sets *corrected
* if an error was corrected, and returns the zone (0 for no zone
* or a bad zone-number).
*/
static int check_zone_nr(unsigned short * nr, int * corrected)
{
if (!*nr)
return 0;
if (*nr < FIRSTZONE)
printf("Zone nr < FIRSTZONE in file `");
else if (*nr >= ZONES)
printf("Zone nr >= ZONES in file `");
else
return *nr;
print_current_name();
printf("'.");
if (ask("Remove block",1)) {
*nr = 0;
*corrected = 1;
}
return 0;
}
#ifdef HAVE_MINIX2
static int check_zone_nr2 (unsigned int *nr, int *corrected)
{
if (!*nr)
return 0;
if (*nr < FIRSTZONE)
printf ("Zone nr < FIRSTZONE in file `");
else if (*nr >= ZONES)
printf ("Zone nr >= ZONES in file `");
else
return *nr;
print_current_name ();
printf ("'.");
if (ask ("Remove block", 1)) {
*nr = 0;
*corrected = 1;
}
return 0;
}
#endif
/*
* read-block reads block nr into the buffer at addr.
*/
static void read_block(unsigned int nr, char * addr)
{
if (!nr) {
memset(addr,0,BLOCK_SIZE);
return;
}
if (BLOCK_SIZE*nr != lseek(IN, BLOCK_SIZE*nr, SEEK_SET)) {
printf("Read error: unable to seek to block in file '");
print_current_name();
printf("'\n");
memset(addr,0,BLOCK_SIZE);
errors_uncorrected = 1;
} else if (BLOCK_SIZE != read(IN, addr, BLOCK_SIZE)) {
printf("Read error: bad block in file '");
print_current_name();
printf("'\n");
memset(addr,0,BLOCK_SIZE);
errors_uncorrected = 1;
}
}
/*
* write_block writes block nr to disk.
*/
static void write_block(unsigned int nr, char * addr)
{
if (!nr)
return;
if (nr < FIRSTZONE || nr >= ZONES) {
printf("Internal error: trying to write bad block\n"
"Write request ignored\n");
errors_uncorrected = 1;
return;
}
if (BLOCK_SIZE*nr != lseek(IN, BLOCK_SIZE*nr, SEEK_SET))
die("seek failed in write_block");
if (BLOCK_SIZE != write(IN, addr, BLOCK_SIZE)) {
printf("Write error: bad block in file '");
print_current_name();
printf("'\n");
errors_uncorrected = 1;
}
}
/*
* map-block calculates the absolute block nr of a block in a file.
* It sets 'changed' if the inode has needed changing, and re-writes
* any indirect blocks with errors.
*/
static int map_block(struct minix_inode * inode, unsigned int blknr)
{
unsigned short ind[BLOCK_SIZE>>1];
unsigned short dind[BLOCK_SIZE>>1];
int blk_chg, block, result;
if (blknr<7)
return check_zone_nr(inode->i_zone + blknr, &changed);
blknr -= 7;
if (blknr<512) {
block = check_zone_nr(inode->i_zone + 7, &changed);
read_block(block, (char *) ind);
blk_chg = 0;
result = check_zone_nr(blknr + ind, &blk_chg);
if (blk_chg)
write_block(block, (char *) ind);
return result;
}
blknr -= 512;
block = check_zone_nr(inode->i_zone + 8, &changed);
read_block(block, (char *) dind);
blk_chg = 0;
result = check_zone_nr(dind + (blknr/512), &blk_chg);
if (blk_chg)
write_block(block, (char *) dind);
block = result;
read_block(block, (char *) ind);
blk_chg = 0;
result = check_zone_nr(ind + (blknr%512), &blk_chg);
if (blk_chg)
write_block(block, (char *) ind);
return result;
}
#ifdef HAVE_MINIX2
static int map_block2 (struct minix2_inode *inode, unsigned int blknr)
{
unsigned int ind[BLOCK_SIZE >> 2];
unsigned int dind[BLOCK_SIZE >> 2];
unsigned int tind[BLOCK_SIZE >> 2];
int blk_chg, block, result;
if (blknr < 7)
return check_zone_nr2 (inode->i_zone + blknr, &changed);
blknr -= 7;
if (blknr < 256) {
block = check_zone_nr2 (inode->i_zone + 7, &changed);
read_block (block, (char *) ind);
blk_chg = 0;
result = check_zone_nr2 (blknr + ind, &blk_chg);
if (blk_chg)
write_block (block, (char *) ind);
return result;
}
blknr -= 256;
if (blknr >= 256 * 256) {
block = check_zone_nr2 (inode->i_zone + 8, &changed);
read_block (block, (char *) dind);
blk_chg = 0;
result = check_zone_nr2 (dind + blknr / 256, &blk_chg);
if (blk_chg)
write_block (block, (char *) dind);
block = result;
read_block (block, (char *) ind);
blk_chg = 0;
result = check_zone_nr2 (ind + blknr % 256, &blk_chg);
if (blk_chg)
write_block (block, (char *) ind);
return result;
}
blknr -= 256 * 256;
block = check_zone_nr2 (inode->i_zone + 9, &changed);
read_block (block, (char *) tind);
blk_chg = 0;
result = check_zone_nr2 (tind + blknr / (256 * 256), &blk_chg);
if (blk_chg)
write_block (block, (char *) tind);
block = result;
read_block (block, (char *) dind);
blk_chg = 0;
result = check_zone_nr2 (dind + (blknr / 256) % 256, &blk_chg);
if (blk_chg)
write_block (block, (char *) dind);
block = result;
read_block (block, (char *) ind);
blk_chg = 0;
result = check_zone_nr2 (ind + blknr % 256, &blk_chg);
if (blk_chg)
write_block (block, (char *) ind);
return result;
}
#endif
static void write_super_block(void)
{
/*
* Set the state of the filesystem based on whether or not there
* are uncorrected errors. The filesystem valid flag is
* unconditionally set if we get this far.
*/
Super.s_state |= MINIX_VALID_FS;
if ( errors_uncorrected )
Super.s_state |= MINIX_ERROR_FS;
else
Super.s_state &= ~MINIX_ERROR_FS;
if (BLOCK_SIZE != lseek(IN, BLOCK_SIZE, SEEK_SET))
die("seek failed in write_super_block");
if (BLOCK_SIZE != write(IN, super_block_buffer, BLOCK_SIZE))
die("unable to write super-block");
return;
}
static void write_tables(void)
{
write_super_block();
if (IMAPS*BLOCK_SIZE != write(IN,inode_map,IMAPS*BLOCK_SIZE))
die("Unable to write inode map");
if (ZMAPS*BLOCK_SIZE != write(IN,zone_map,ZMAPS*BLOCK_SIZE))
die("Unable to write zone map");
if (INODE_BUFFER_SIZE != write(IN,inode_buffer,INODE_BUFFER_SIZE))
die("Unable to write inodes");
}
static void get_dirsize (void)
{
int block;
char blk[BLOCK_SIZE];
int size;
#if HAVE_MINIX2
if (version2)
block = Inode2[ROOT_INO].i_zone[0];
else
#endif
block = Inode[ROOT_INO].i_zone[0];
read_block (block, blk);
for (size = 16; size < BLOCK_SIZE; size <<= 1) {
if (strcmp (blk + size + 2, "..") == 0) {
dirsize = size;
namelen = size - 2;
return;
}
}
/* use defaults */
}
static void read_superblock(void)
{
if (BLOCK_SIZE != lseek(IN, BLOCK_SIZE, SEEK_SET))
die("seek failed");
if (BLOCK_SIZE != read(IN, super_block_buffer, BLOCK_SIZE))
die("unable to read super block");
if (MAGIC == MINIX_SUPER_MAGIC) {
namelen = 14;
dirsize = 16;
version2 = 0;
} else if (MAGIC == MINIX_SUPER_MAGIC2) {
namelen = 30;
dirsize = 32;
version2 = 0;
#ifdef HAVE_MINIX2
} else if (MAGIC == MINIX2_SUPER_MAGIC) {
namelen = 14;
dirsize = 16;
version2 = 1;
} else if (MAGIC == MINIX2_SUPER_MAGIC2) {
namelen = 30;
dirsize = 32;
version2 = 1;
#endif
} else
die("bad magic number in super-block");
if (ZONESIZE != 0 || BLOCK_SIZE != 1024)
die("Only 1k blocks/zones supported");
if (IMAPS * BLOCK_SIZE * 8 < INODES + 1)
die("bad s_imap_blocks field in super-block");
if (ZMAPS * BLOCK_SIZE * 8 < ZONES - FIRSTZONE + 1)
die("bad s_zmap_blocks field in super-block");
}
static void read_tables(void)
{
inode_map = malloc(IMAPS * BLOCK_SIZE);
if (!inode_map)
die("Unable to allocate buffer for inode map");
zone_map = malloc(ZMAPS * BLOCK_SIZE);
if (!inode_map)
die("Unable to allocate buffer for zone map");
memset(inode_map,0,sizeof(inode_map));
memset(zone_map,0,sizeof(zone_map));
inode_buffer = malloc(INODE_BUFFER_SIZE);
if (!inode_buffer)
die("Unable to allocate buffer for inodes");
inode_count = malloc(INODES + 1);
if (!inode_count)
die("Unable to allocate buffer for inode count");
zone_count = malloc(ZONES);
if (!zone_count)
die("Unable to allocate buffer for zone count");
if (IMAPS*BLOCK_SIZE != read(IN,inode_map,IMAPS*BLOCK_SIZE))
die("Unable to read inode map");
if (ZMAPS*BLOCK_SIZE != read(IN,zone_map,ZMAPS*BLOCK_SIZE))
die("Unable to read zone map");
if (INODE_BUFFER_SIZE != read(IN,inode_buffer,INODE_BUFFER_SIZE))
die("Unable to read inodes");
if (NORM_FIRSTZONE != FIRSTZONE) {
printf("Warning: Firstzone != Norm_firstzone\n");
errors_uncorrected = 1;
}
get_dirsize ();
if (show) {
printf("%ld inodes\n",INODES);
printf("%ld blocks\n",ZONES);
printf("Firstdatazone=%ld (%ld)\n",FIRSTZONE,NORM_FIRSTZONE);
printf("Zonesize=%d\n",BLOCK_SIZE<<ZONESIZE);
printf("Maxsize=%ld\n",MAXSIZE);
printf("Filesystem state=%d\n", Super.s_state);
printf("namelen=%d\n\n",namelen);
}
}
struct minix_inode * get_inode(unsigned int nr)
{
struct minix_inode * inode;
if (!nr || nr > INODES)
return NULL;
total++;
inode = Inode + nr;
if (!inode_count[nr]) {
if (!inode_in_use(nr)) {
printf("Inode %d marked not used, but used for file '",
nr);
print_current_name();
printf("'\n");
if (repair) {
if (ask("Mark in use",1))
mark_inode(nr);
} else {
errors_uncorrected = 1;
}
}
if (S_ISDIR(inode->i_mode))
directory++;
else if (S_ISREG(inode->i_mode))
regular++;
else if (S_ISCHR(inode->i_mode))
chardev++;
else if (S_ISBLK(inode->i_mode))
blockdev++;
else if (S_ISLNK(inode->i_mode))
symlinks++;
else if (S_ISSOCK(inode->i_mode))
;
else if (S_ISFIFO(inode->i_mode))
;
else {
print_current_name();
printf(" has mode %05o\n",inode->i_mode);
}
} else
links++;
if (!++inode_count[nr]) {
printf("Warning: inode count too big.\n");
inode_count[nr]--;
errors_uncorrected = 1;
}
return inode;
}
#ifdef HAVE_MINIX2
struct minix2_inode *
get_inode2 (unsigned int nr)
{
struct minix2_inode *inode;
if (!nr || nr > INODES)
return NULL;
total++;
inode = Inode2 + nr;
if (!inode_count[nr]) {
if (!inode_in_use (nr)) {
printf ("Inode %d marked not used, but used for file '", nr);
print_current_name ();
printf ("'\n");
if (repair) {
if (ask ("Mark in use", 1))
mark_inode (nr);
else
errors_uncorrected = 1;
}
}
if (S_ISDIR (inode->i_mode))
directory++;
else if (S_ISREG (inode->i_mode))
regular++;
else if (S_ISCHR (inode->i_mode))
chardev++;
else if (S_ISBLK (inode->i_mode))
blockdev++;
else if (S_ISLNK (inode->i_mode))
symlinks++;
else if (S_ISSOCK (inode->i_mode));
else if (S_ISFIFO (inode->i_mode));
else {
print_current_name ();
printf (" has mode %05o\n", inode->i_mode);
}
} else
links++;
if (!++inode_count[nr]) {
printf ("Warning: inode count too big.\n");
inode_count[nr]--;
errors_uncorrected = 1;
}
return inode;
}
#endif
static void check_root(void)
{
struct minix_inode * inode = Inode + ROOT_INO;
if (!inode || !S_ISDIR(inode->i_mode))
die("root inode isn't a directory");
}
#ifdef HAVE_MINIX2
static void check_root2 (void)
{
struct minix2_inode *inode = Inode2 + ROOT_INO;
if (!inode || !S_ISDIR (inode->i_mode))
die ("root inode isn't a directory");
}
#endif
static int add_zone(unsigned short * znr, int * corrected)
{
int result;
int block;
result = 0;
block = check_zone_nr(znr, corrected);
if (!block)
return 0;
if (zone_count[block]) {
printf("Block has been used before. Now in file `");
print_current_name();
printf("'.");
if (ask("Clear",1)) {
*znr = 0;
block = 0;
*corrected = 1;
}
}
if (!block)
return 0;
if (!zone_in_use(block)) {
printf("Block %d in file `",block);
print_current_name();
printf("' is marked not in use.");
if (ask("Correct",1))
mark_zone(block);
}
if (!++zone_count[block])
zone_count[block]--;
return block;
}
#ifdef HAVE_MINIX2
static int add_zone2 (unsigned int *znr, int *corrected)
{
int result;
int block;
result = 0;
block = check_zone_nr2 (znr, corrected);
if (!block)
return 0;
if (zone_count[block]) {
printf ("Block has been used before. Now in file `");
print_current_name ();
printf ("'.");
if (ask ("Clear", 1)) {
*znr = 0;
block = 0;
*corrected = 1;
}
}
if (!block)
return 0;
if (!zone_in_use (block)) {
printf ("Block %d in file `", block);
print_current_name ();
printf ("' is marked not in use.");
if (ask ("Correct", 1))
mark_zone (block);
}
if (!++zone_count[block])
zone_count[block]--;
return block;
}
#endif
static void add_zone_ind(unsigned short * znr, int * corrected)
{
static char blk[BLOCK_SIZE];
int i, chg_blk=0;
int block;
block = add_zone(znr, corrected);
if (!block)
return;
read_block(block, blk);
for (i=0 ; i < (BLOCK_SIZE>>1) ; i++)
add_zone(i + (unsigned short *) blk, &chg_blk);
if (chg_blk)
write_block(block, blk);
}
#ifdef HAVE_MINIX2
static void
add_zone_ind2 (unsigned int *znr, int *corrected)
{
static char blk[BLOCK_SIZE];
int i, chg_blk = 0;
int block;
block = add_zone2 (znr, corrected);
if (!block)
return;
read_block (block, blk);
for (i = 0; i < BLOCK_SIZE >> 2; i++)
add_zone2 (i + (unsigned int *) blk, &chg_blk);
if (chg_blk)
write_block (block, blk);
}
#endif
static void add_zone_dind(unsigned short * znr, int * corrected)
{
static char blk[BLOCK_SIZE];
int i, blk_chg=0;
int block;
block = add_zone(znr, corrected);
if (!block)
return;
read_block(block, blk);
for (i=0 ; i < (BLOCK_SIZE>>1) ; i++)
add_zone_ind(i + (unsigned short *) blk, &blk_chg);
if (blk_chg)
write_block(block, blk);
}
#ifdef HAVE_MINIX2
static void
add_zone_dind2 (unsigned int *znr, int *corrected)
{
static char blk[BLOCK_SIZE];
int i, blk_chg = 0;
int block;
block = add_zone2 (znr, corrected);
if (!block)
return;
read_block (block, blk);
for (i = 0; i < BLOCK_SIZE >> 2; i++)
add_zone_ind2 (i + (unsigned int *) blk, &blk_chg);
if (blk_chg)
write_block (block, blk);
}
static void
add_zone_tind2 (unsigned int *znr, int *corrected)
{
static char blk[BLOCK_SIZE];
int i, blk_chg = 0;
int block;
block = add_zone2 (znr, corrected);
if (!block)
return;
read_block (block, blk);
for (i = 0; i < BLOCK_SIZE >> 2; i++)
add_zone_dind2 (i + (unsigned int *) blk, &blk_chg);
if (blk_chg)
write_block (block, blk);
}
#endif
static void check_zones(unsigned int i)
{
struct minix_inode * inode;
if (!i || i > INODES)
return;
if (inode_count[i] > 1) /* have we counted this file already? */
return;
inode = Inode + i;
if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode) &&
!S_ISLNK(inode->i_mode))
return;
for (i=0 ; i<7 ; i++)
add_zone(i + inode->i_zone, &changed);
add_zone_ind(7 + inode->i_zone, &changed);
add_zone_dind(8 + inode->i_zone, &changed);
}
#ifdef HAVE_MINIX2
static void
check_zones2 (unsigned int i)
{
struct minix2_inode *inode;
if (!i || i > INODES)
return;
if (inode_count[i] > 1) /* have we counted this file already? */
return;
inode = Inode2 + i;
if (!S_ISDIR (inode->i_mode) && !S_ISREG (inode->i_mode)
&& !S_ISLNK (inode->i_mode))
return;
for (i = 0; i < 7; i++)
add_zone2 (i + inode->i_zone, &changed);
add_zone_ind2 (7 + inode->i_zone, &changed);
add_zone_dind2 (8 + inode->i_zone, &changed);
add_zone_tind2 (9 + inode->i_zone, &changed);
}
#endif
static void check_file(struct minix_inode * dir, unsigned int offset)
{
static char blk[BLOCK_SIZE];
struct minix_inode * inode;
int ino;
char * name;
int block;
block = map_block(dir,offset/BLOCK_SIZE);
read_block(block, blk);
name = blk + (offset % BLOCK_SIZE) + 2;
ino = * (unsigned short *) (name-2);
if (ino > INODES) {
print_current_name();
printf(" contains a bad inode number for file '");
printf("%.*s'.",namelen,name);
if (ask(" Remove",1)) {
*(unsigned short *)(name-2) = 0;
write_block(block, blk);
}
ino = 0;
}
if (name_depth < MAX_DEPTH)
strncpy (name_list[name_depth], name, namelen);
name_depth++;
inode = get_inode(ino);
name_depth--;
if (!offset) {
if (!inode || strcmp(".",name)) {
print_current_name();
printf(": bad directory: '.' isn't first\n");
errors_uncorrected = 1;
} else return;
}
if (offset == dirsize) {
if (!inode || strcmp("..",name)) {
print_current_name();
printf(": bad directory: '..' isn't second\n");
errors_uncorrected = 1;
} else return;
}
if (!inode)
return;
if (name_depth < MAX_DEPTH)
strncpy(name_list[name_depth],name,namelen);
name_depth++;
if (list) {
if (verbose)
printf("%6d %07o %3d ",ino,inode->i_mode,inode->i_nlinks);
print_current_name();
if (S_ISDIR(inode->i_mode))
printf(":\n");
else
printf("\n");
}
check_zones(ino);
if (inode && S_ISDIR(inode->i_mode))
recursive_check(ino);
name_depth--;
return;
}
#ifdef HAVE_MINIX2
static void
check_file2 (struct minix2_inode *dir, unsigned int offset)
{
static char blk[BLOCK_SIZE];
struct minix2_inode *inode;
int ino;
char *name;
int block;
block = map_block2 (dir, offset / BLOCK_SIZE);
read_block (block, blk);
name = blk + (offset % BLOCK_SIZE) + 2;
ino = *(unsigned short *) (name - 2);
if (ino > INODES) {
print_current_name ();
printf (" contains a bad inode number for file '");
printf ("%.*s'.", namelen, name);
if (ask (" Remove", 1)) {
*(unsigned short *) (name - 2) = 0;
write_block (block, blk);
}
ino = 0;
}
if (name_depth < MAX_DEPTH)
strncpy (name_list[name_depth], name, namelen);
name_depth++;
inode = get_inode2 (ino);
name_depth--;
if (!offset) {
if (!inode || strcmp (".", name)) {
print_current_name ();
printf (": bad directory: '.' isn't first\n");
errors_uncorrected = 1;
} else
return;
}
if (offset == dirsize) {
if (!inode || strcmp ("..", name)) {
print_current_name ();
printf (": bad directory: '..' isn't second\n");
errors_uncorrected = 1;
} else
return;
}
if (!inode)
return;
name_depth++;
if (list) {
if (verbose)
printf ("%6d %07o %3d ", ino, inode->i_mode, inode->i_nlinks);
print_current_name ();
if (S_ISDIR (inode->i_mode))
printf (":\n");
else
printf ("\n");
}
check_zones2 (ino);
if (inode && S_ISDIR (inode->i_mode))
recursive_check2 (ino);
name_depth--;
return;
}
#endif
static void recursive_check(unsigned int ino)
{
struct minix_inode * dir;
unsigned int offset;
dir = Inode + ino;
if (!S_ISDIR(dir->i_mode))
die("internal error");
if (dir->i_size < 2 * dirsize) {
print_current_name();
printf(": bad directory: size<32");
errors_uncorrected = 1;
}
for (offset = 0 ; offset < dir->i_size ; offset += dirsize)
check_file(dir,offset);
}
#ifdef HAVE_MINIX2
static void
recursive_check2 (unsigned int ino)
{
struct minix2_inode *dir;
unsigned int offset;
dir = Inode2 + ino;
if (!S_ISDIR (dir->i_mode))
die ("internal error");
if (dir->i_size < 2 * dirsize) {
print_current_name ();
printf (": bad directory: size < 32");
errors_uncorrected = 1;
}
for (offset = 0; offset < dir->i_size; offset += dirsize)
check_file2 (dir, offset);
}
#endif
static int bad_zone(int i)
{
char buffer[1024];
if (BLOCK_SIZE*i != lseek(IN, BLOCK_SIZE*i, SEEK_SET))
die("seek failed in bad_zone");
return (BLOCK_SIZE != read(IN, buffer, BLOCK_SIZE));
}
static void check_counts(void)
{
int i;
for (i=1 ; i <= INODES ; i++) {
if (!inode_in_use(i) && Inode[i].i_mode && warn_mode) {
printf("Inode %d mode not cleared.",i);
if (ask("Clear",1)) {
Inode[i].i_mode = 0;
changed = 1;
}
}
if (!inode_count[i]) {
if (!inode_in_use(i))
continue;
printf("Inode %d not used, marked used in the bitmap.",i);
if (ask("Clear",1))
unmark_inode(i);
continue;
}
if (!inode_in_use(i)) {
printf("Inode %d used, marked unused in the bitmap.", i);
if (ask("Set",1))
mark_inode(i);
}
if (Inode[i].i_nlinks != inode_count[i]) {
printf("Inode %d (mode = %07o), i_nlinks=%d, counted=%d.",
i,Inode[i].i_mode,Inode[i].i_nlinks,inode_count[i]);
if (ask("Set i_nlinks to count",1)) {
Inode[i].i_nlinks=inode_count[i];
changed=1;
}
}
}
for (i=FIRSTZONE ; i < ZONES ; i++) {
if (zone_in_use(i) == zone_count[i])
continue;
if (!zone_count[i]) {
if (bad_zone(i))
continue;
printf("Zone %d: marked in use, no file uses it.",i);
if (ask("Unmark",1))
unmark_zone(i);
continue;
}
printf("Zone %d: %sin use, counted=%d\n",
i,zone_in_use(i)?"":"not ",zone_count[i]);
}
}
#ifdef HAVE_MINIX2
static void
check_counts2 (void)
{
int i;
for (i = 1; i <= INODES; i++) {
if (!inode_in_use (i) && Inode2[i].i_mode && warn_mode) {
printf ("Inode %d mode not cleared.", i);
if (ask ("Clear", 1)) {
Inode2[i].i_mode = 0;
changed = 1;
}
}
if (!inode_count[i]) {
if (!inode_in_use (i))
continue;
printf ("Inode %d not used, marked used in the bitmap.", i);
if (ask ("Clear", 1))
unmark_inode (i);
continue;
}
if (!inode_in_use (i)) {
printf ("Inode %d used, marked unused in the bitmap.", i);
if (ask ("Set", 1))
mark_inode (i);
}
if (Inode2[i].i_nlinks != inode_count[i]) {
printf ("Inode %d (mode = %07o), i_nlinks=%d, counted=%d.",
i, Inode2[i].i_mode, Inode2[i].i_nlinks, inode_count[i]);
if (ask ("Set i_nlinks to count", 1)) {
Inode2[i].i_nlinks = inode_count[i];
changed = 1;
}
}
}
for (i = FIRSTZONE; i < ZONES; i++) {
if (zone_in_use (i) == zone_count[i])
continue;
if (!zone_count[i]) {
if (bad_zone (i))
continue;
printf ("Zone %d: marked in use, no file uses it.", i);
if (ask ("Unmark", 1))
unmark_zone (i);
continue;
}
printf ("Zone %d: %sin use, counted=%d\n",
i, zone_in_use (i) ? "" : "not ", zone_count[i]);
}
}
#endif
static void check(void)
{
memset(inode_count,0,(INODES + 1) * sizeof(*inode_count));
memset(zone_count,0,ZONES*sizeof(*zone_count));
check_zones(ROOT_INO);
recursive_check(ROOT_INO);
check_counts();
}
#ifdef HAVE_MINIX2
static void
check2 (void)
{
memset (inode_count, 0, (INODES + 1) * sizeof (*inode_count));
memset (zone_count, 0, ZONES * sizeof (*zone_count));
check_zones2 (ROOT_INO);
recursive_check2 (ROOT_INO);
check_counts2 ();
}
#endif
extern int
fsck_minix_main(int argc, char ** argv)
{
struct termios tmp;
int count;
int retcode = 0;
if (argc && *argv)
program_name = *argv;
if (INODE_SIZE * MINIX_INODES_PER_BLOCK != BLOCK_SIZE)
die("bad inode size");
#ifdef HAVE_MINIX2
if (INODE_SIZE2 * MINIX2_INODES_PER_BLOCK != BLOCK_SIZE)
die("bad v2 inode size");
#endif
while (argc-- > 1) {
argv++;
if (argv[0][0] != '-') {
if (device_name)
show_usage();
else
device_name = argv[0];
} else while (*++argv[0])
switch (argv[0][0]) {
case 'l': list=1; break;
case 'a': automatic=1; repair=1; break;
case 'r': automatic=0; repair=1; break;
case 'v': verbose=1; break;
case 's': show=1; break;
case 'm': warn_mode=1; break;
case 'f': force=1; break;
default: show_usage();
}
}
if (!device_name)
show_usage();
check_mount(); /* trying to check a mounted filesystem? */
if (repair && !automatic) {
if (!isatty(0) || !isatty(1))
die("need terminal for interactive repairs");
}
IN = open(device_name,repair?O_RDWR:O_RDONLY);
if (IN < 0)
die("unable to open '%s'");
for (count=0 ; count<3 ; count++)
sync();
read_superblock();
/*
* Determine whether or not we should continue with the checking.
* This is based on the status of the filesystem valid and error
* flags and whether or not the -f switch was specified on the
* command line.
*/
printf("%s, %s\n", program_name, program_version);
if ( !(Super.s_state & MINIX_ERROR_FS) &&
(Super.s_state & MINIX_VALID_FS) &&
!force ) {
if (repair)
printf("%s is clean, no check.\n", device_name);
return retcode;
}
else if (force)
printf("Forcing filesystem check on %s.\n", device_name);
else if (repair)
printf("Filesystem on %s is dirty, needs checking.\n",\
device_name);
read_tables();
if (repair && !automatic) {
tcgetattr(0,&termios);
tmp = termios;
tmp.c_lflag &= ~(ICANON|ECHO);
tcsetattr(0,TCSANOW,&tmp);
termios_set = 1;
}
#if HAVE_MINIX2
if (version2) {
check_root2 ();
check2 ();
} else
#endif
{
check_root();
check();
}
if (verbose) {
int i, free;
for (i=1,free=0 ; i <= INODES ; i++)
if (!inode_in_use(i))
free++;
printf("\n%6ld inodes used (%ld%%)\n",(INODES-free),
100*(INODES-free)/INODES);
for (i=FIRSTZONE,free=0 ; i < ZONES ; i++)
if (!zone_in_use(i))
free++;
printf("%6ld zones used (%ld%%)\n",(ZONES-free),
100*(ZONES-free)/ZONES);
printf("\n%6d regular files\n"
"%6d directories\n"
"%6d character device files\n"
"%6d block device files\n"
"%6d links\n"
"%6d symbolic links\n"
"------\n"
"%6d files\n",
regular,directory,chardev,blockdev,
links-2*directory+1,symlinks,total-2*directory+1);
}
if (changed) {
write_tables();
printf( "----------------------------\n"
"FILE SYSTEM HAS BEEN CHANGED\n"
"----------------------------\n");
for (count=0 ; count<3 ; count++)
sync();
}
else if ( repair )
write_super_block();
if (repair && !automatic)
tcsetattr(0,TCSANOW,&termios);
if (changed)
retcode += 3;
if (errors_uncorrected)
retcode += 4;
return retcode;
}
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