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e2fsprogs/e2fsck/unix.c

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/*
* unix.c - The unix-specific code for e2fsck
*
* 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 <stdio.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include <string.h>
#include <fcntl.h>
#include <ctype.h>
#include <termios.h>
#include <time.h>
#ifdef HAVE_GETOPT_H
#include <getopt.h>
#endif
#include <unistd.h>
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_MNTENT_H
#include <mntent.h>
#endif
#include <sys/ioctl.h>
#include <malloc.h>
#include "et/com_err.h"
#include "e2fsck.h"
#include "problem.h"
#include "../version.h"
extern int isatty(int);
/* Command line options */
static int blocksize = 0;
static int swapfs = 0;
static int normalize_swapfs = 0;
static int cflag = 0; /* check disk */
static int show_version_only = 0;
static int force = 0;
static int verbose = 0;
static int replace_bad_blocks = 0;
static char *bad_blocks_file = 0;
static int possible_block_sizes[] = { 1024, 2048, 4096, 8192, 0};
static int root_filesystem = 0;
static int read_only_root = 0;
static void usage(e2fsck_t ctx)
{
fprintf(stderr,
"Usage: %s [-panyrcdfvstFSV] [-b superblock] [-B blocksize]\n"
"\t\t[-I inode_buffer_blocks] [-P process_inode_size]\n"
"\t\t[-l|-L bad_blocks_file] device\n", ctx->program_name);
exit(FSCK_USAGE);
}
static void show_stats(e2fsck_t ctx)
{
ext2_filsys fs = ctx->fs;
int inodes, inodes_used, blocks, blocks_used;
int dir_links;
int num_files, num_links;
int frag_percent;
dir_links = 2 * ctx->fs_directory_count - 1;
num_files = ctx->fs_total_count - dir_links;
num_links = ctx->fs_links_count - dir_links;
inodes = fs->super->s_inodes_count;
inodes_used = (fs->super->s_inodes_count -
fs->super->s_free_inodes_count);
blocks = fs->super->s_blocks_count;
blocks_used = (fs->super->s_blocks_count -
fs->super->s_free_blocks_count);
frag_percent = (10000 * ctx->fs_fragmented) / inodes_used;
frag_percent = (frag_percent + 5) / 10;
if (!verbose) {
printf("%s: %d/%d files (%0d.%d%% non-contiguous), %d/%d blocks\n",
ctx->device_name, inodes_used, inodes,
frag_percent / 10, frag_percent % 10,
blocks_used, blocks);
return;
}
printf ("\n%8d inode%s used (%d%%)\n", inodes_used,
(inodes_used != 1) ? "s" : "",
100 * inodes_used / inodes);
printf ("%8d non-contiguous inodes (%0d.%d%%)\n",
ctx->fs_fragmented, frag_percent / 10, frag_percent % 10);
printf (" # of inodes with ind/dind/tind blocks: %d/%d/%d\n",
ctx->fs_ind_count, ctx->fs_dind_count, ctx->fs_tind_count);
printf ("%8d block%s used (%d%%)\n"
"%8d bad block%s\n", blocks_used,
(blocks_used != 1) ? "s" : "",
100 * blocks_used / blocks, ctx->fs_badblocks_count,
ctx->fs_badblocks_count != 1 ? "s" : "");
printf ("\n%8d regular file%s\n"
"%8d director%s\n"
"%8d character device file%s\n"
"%8d block device file%s\n"
"%8d fifo%s\n"
"%8d link%s\n"
"%8d symbolic link%s (%d fast symbolic link%s)\n"
"%8d socket%s\n"
"--------\n"
"%8d file%s\n",
ctx->fs_regular_count,
(ctx->fs_regular_count != 1) ? "s" : "",
ctx->fs_directory_count,
(ctx->fs_directory_count != 1) ? "ies" : "y",
ctx->fs_chardev_count,
(ctx->fs_chardev_count != 1) ? "s" : "",
ctx->fs_blockdev_count,
(ctx->fs_blockdev_count != 1) ? "s" : "",
ctx->fs_fifo_count,
(ctx->fs_fifo_count != 1) ? "s" : "",
ctx->fs_links_count - dir_links,
((ctx->fs_links_count - dir_links) != 1) ? "s" : "",
ctx->fs_symlinks_count,
(ctx->fs_symlinks_count != 1) ? "s" : "",
ctx->fs_fast_symlinks_count,
(ctx->fs_fast_symlinks_count != 1) ? "s" : "",
ctx->fs_sockets_count, (ctx->fs_sockets_count != 1) ? "s" : "",
ctx->fs_total_count - dir_links,
((ctx->fs_total_count - dir_links) != 1) ? "s" : "");
}
static void check_mount(e2fsck_t ctx)
{
errcode_t retval;
int mount_flags, cont, fd;
retval = ext2fs_check_if_mounted(ctx->filesystem_name, &mount_flags);
if (retval) {
com_err("ext2fs_check_if_mount", retval,
"while determining whether %s is mounted.",
ctx->filesystem_name);
return;
}
if (!(mount_flags & EXT2_MF_MOUNTED))
return;
#if (defined(__linux__) && defined(HAVE_MNTENT_H))
/*
* 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) {
if (errno == EROFS)
return;
} else
close(fd);
#endif
if (ctx->options & E2F_OPT_READONLY) {
printf("Warning! %s is mounted.\n", ctx->device_name);
return;
}
printf("%s is mounted.\n\n", ctx->device_name);
printf("\007\007\007\007WARNING!!! Running e2fsck on a mounted filesystem "
"may cause\nSEVERE filesystem damage.\007\007\007\n\n");
if (isatty (0) && isatty (1))
cont = ask_yn("Do you really want to continue", -1);
else
cont = 0;
if (!cont) {
printf ("check aborted.\n");
exit (0);
}
return;
}
static void sync_disks(NOARGS)
{
sync();
sync();
sleep(1);
sync();
}
/*
* This routine checks to see if a filesystem can be skipped; if so,
* it will exit with E2FSCK_OK. Under some conditions it will print a
* message explaining why a check is being forced.
*/
static void check_if_skip(e2fsck_t ctx)
{
ext2_filsys fs = ctx->fs;
const char *reason = NULL;
if (force || bad_blocks_file || cflag || swapfs)
return;
if (fs->super->s_state & EXT2_ERROR_FS)
reason = "contains a file system with errors";
else if (fs->super->s_mnt_count >=
(unsigned) fs->super->s_max_mnt_count)
reason = "has reached maximal mount count";
else if (fs->super->s_checkinterval &&
time(0) >= (fs->super->s_lastcheck +
fs->super->s_checkinterval))
reason = "has gone too long without being checked";
else if ((fs->super->s_state & EXT2_VALID_FS) == 0)
reason = "was not cleanly unmounted";
if (reason) {
printf("%s %s, check forced.\n", ctx->device_name, reason);
return;
}
printf("%s: clean, %d/%d files, %d/%d blocks\n", ctx->device_name,
fs->super->s_inodes_count - fs->super->s_free_inodes_count,
fs->super->s_inodes_count,
fs->super->s_blocks_count - fs->super->s_free_blocks_count,
fs->super->s_blocks_count);
ext2fs_close(fs);
exit(FSCK_OK);
}
#define PATH_SET "PATH=/sbin"
static errcode_t PRS(int argc, char *argv[], e2fsck_t *ret_ctx)
{
int flush = 0;
int c;
#ifdef MTRACE
extern void *mallwatch;
#endif
char *oldpath = getenv("PATH");
e2fsck_t ctx;
errcode_t retval;
retval = e2fsck_allocate_context(&ctx);
if (retval)
return retval;
*ret_ctx = ctx;
/* Update our PATH to include /sbin */
if (oldpath) {
char *newpath;
newpath = malloc(sizeof (PATH_SET) + 1 + strlen (oldpath));
if (!newpath)
fatal_error(ctx, "Couldn't malloc() newpath");
strcpy (newpath, PATH_SET);
strcat (newpath, ":");
strcat (newpath, oldpath);
putenv (newpath);
} else
putenv (PATH_SET);
setbuf(stdout, NULL);
setbuf(stderr, NULL);
initialize_ext2_error_table();
if (argc && *argv)
ctx->program_name = *argv;
else
ctx->program_name = "e2fsck";
while ((c = getopt (argc, argv, "panyrcB:dfvtFVM:b:I:P:l:L:N:Ss")) != EOF)
switch (c) {
case 'p':
case 'a':
ctx->options |= E2F_OPT_PREEN;
ctx->options &= ~(E2F_OPT_YES|E2F_OPT_NO);
break;
case 'n':
ctx->options |= E2F_OPT_NO;
ctx->options &= ~(E2F_OPT_YES|E2F_OPT_PREEN);
break;
case 'y':
ctx->options |= E2F_OPT_YES;
ctx->options &= ~(E2F_OPT_PREEN|E2F_OPT_NO);
break;
case 't':
#ifdef RESOURCE_TRACK
if (ctx->options & E2F_OPT_TIME)
ctx->options |= E2F_OPT_TIME2;
else
ctx->options |= E2F_OPT_TIME;
#else
fprintf(stderr, "The -t option is not "
"supported on this version of e2fsck.\n");
#endif
break;
case 'c':
cflag++;
ctx->options |= E2F_OPT_CHECKBLOCKS;
break;
case 'r':
/* What we do by default, anyway! */
break;
case 'b':
ctx->use_superblock = atoi(optarg);
break;
case 'B':
blocksize = atoi(optarg);
break;
case 'I':
ctx->inode_buffer_blocks = atoi(optarg);
break;
case 'P':
ctx->process_inode_size = atoi(optarg);
break;
case 'L':
replace_bad_blocks++;
case 'l':
bad_blocks_file = malloc(strlen(optarg)+1);
if (!bad_blocks_file)
fatal_error(ctx,
"Couldn't malloc bad_blocks_file");
strcpy(bad_blocks_file, optarg);
break;
case 'd':
ctx->options |= E2F_OPT_DEBUG;
break;
case 'f':
force = 1;
break;
case 'F':
#ifdef BLKFLSBUF
flush = 1;
#else
fatal_error(ctx, "-F not supported");
#endif
break;
case 'v':
verbose = 1;
break;
case 'V':
show_version_only = 1;
break;
#ifdef MTRACE
case 'M':
mallwatch = (void *) strtol(optarg, NULL, 0);
break;
#endif
case 'N':
ctx->device_name = optarg;
break;
case 's':
normalize_swapfs = 1;
case 'S':
swapfs = 1;
break;
default:
usage(ctx);
}
if (show_version_only)
return 0;
if (optind != argc - 1)
usage(ctx);
if ((ctx->options & E2F_OPT_NO) && !bad_blocks_file &&
!cflag && !swapfs)
ctx->options |= E2F_OPT_READONLY;
ctx->filesystem_name = argv[optind];
if (ctx->device_name == 0)
ctx->device_name = ctx->filesystem_name;
if (flush) {
#ifdef BLKFLSBUF
int fd = open(ctx->filesystem_name, O_RDONLY, 0);
if (fd < 0) {
com_err("open", errno, "while opening %s for flushing",
ctx->filesystem_name);
exit(FSCK_ERROR);
}
if (ioctl(fd, BLKFLSBUF, 0) < 0) {
com_err("BLKFLSBUF", errno, "while trying to flush %s",
ctx->filesystem_name);
exit(FSCK_ERROR);
}
close(fd);
#else
fatal_error(ctx, "BLKFLSBUF not supported");
#endif /* BLKFLSBUF */
}
if (swapfs) {
if (cflag || bad_blocks_file) {
fprintf(stderr, "Incompatible options not "
"allowed when byte-swapping.\n");
exit(FSCK_ERROR);
}
}
return 0;
}
static const char *my_ver_string = E2FSPROGS_VERSION;
static const char *my_ver_date = E2FSPROGS_DATE;
int main (int argc, char *argv[])
{
errcode_t retval = 0;
int exit_value = FSCK_OK;
int i;
ext2_filsys fs = 0;
io_manager io_ptr;
struct ext2fs_sb *s;
const char *lib_ver_date;
int my_ver, lib_ver;
e2fsck_t ctx;
struct problem_context pctx;
int flags, run_result;
clear_problem_context(&pctx);
#ifdef MTRACE
mtrace();
#endif
#ifdef MCHECK
mcheck(0);
#endif
my_ver = ext2fs_parse_version_string(my_ver_string);
lib_ver = ext2fs_get_library_version(0, &lib_ver_date);
if (my_ver > lib_ver) {
fprintf( stderr, "Error: ext2fs library version "
"out of date!\n");
show_version_only++;
}
retval = PRS(argc, argv, &ctx);
if (retval) {
com_err("e2fsck", retval,
"while trying to initialize program");
exit(1);
}
#ifdef RESOURCE_TRACK
init_resource_track(&ctx->global_rtrack);
#endif
if (!(ctx->options & E2F_OPT_PREEN) || show_version_only)
fprintf (stderr, "e2fsck %s, %s for EXT2 FS %s, %s\n",
my_ver_string, my_ver_date, EXT2FS_VERSION,
EXT2FS_DATE);
if (show_version_only) {
fprintf(stderr, "\tUsing %s, %s\n",
error_message(EXT2_ET_BASE), lib_ver_date);
exit(0);
}
check_mount(ctx);
if (!(ctx->options & E2F_OPT_PREEN) &&
!(ctx->options & E2F_OPT_NO) &&
!(ctx->options & E2F_OPT_YES)) {
if (!isatty (0) || !isatty (1))
fatal_error(ctx,
"need terminal for interactive repairs");
}
ctx->superblock = ctx->use_superblock;
restart:
#if 1
io_ptr = unix_io_manager;
#else
io_ptr = test_io_manager;
test_io_backing_manager = unix_io_manager;
#endif
sync_disks();
flags = (ctx->options & E2F_OPT_READONLY) ? 0 : EXT2_FLAG_RW;
if (ctx->superblock && blocksize) {
retval = ext2fs_open(ctx->filesystem_name, flags,
ctx->superblock, blocksize, io_ptr, &fs);
} else if (ctx->superblock) {
for (i=0; possible_block_sizes[i]; i++) {
retval = ext2fs_open(ctx->filesystem_name, flags,
ctx->superblock,
possible_block_sizes[i],
io_ptr, &fs);
if (!retval)
break;
}
} else
retval = ext2fs_open(ctx->filesystem_name, flags,
0, 0, io_ptr, &fs);
if (!ctx->superblock && !(ctx->options & E2F_OPT_PREEN) &&
((retval == EXT2_ET_BAD_MAGIC) ||
((retval == 0) && ext2fs_check_desc(fs)))) {
if (!fs || (fs->group_desc_count > 1)) {
printf("%s trying backup blocks...\n",
retval ? "Couldn't find ext2 superblock," :
"Group descriptors look bad...");
ctx->superblock = get_backup_sb(fs);
if (fs)
ext2fs_close(fs);
goto restart;
}
}
if (retval) {
com_err(ctx->program_name, retval, "while trying to open %s",
ctx->filesystem_name);
if (retval == EXT2_ET_REV_TOO_HIGH)
printf ("Get a newer version of e2fsck!\n");
else if (retval == EXT2_ET_SHORT_READ)
printf ("Could this be a zero-length partition?\n");
else if ((retval == EPERM) || (retval == EACCES))
printf("You must have %s access to the "
"filesystem or be root\n",
(ctx->options & E2F_OPT_READONLY) ?
"r/o" : "r/w");
else if (retval == ENXIO)
printf("Possibly non-existent or swap device?\n");
#ifdef EROFS
else if (retval == EROFS)
printf("Disk write-protected; use the -n option"
"to do a read-only\n"
"check of the device.\n");
#endif
else
fix_problem(ctx, PR_0_SB_CORRUPT, &pctx);
exit(FSCK_ERROR);
}
ctx->fs = fs;
fs->private = ctx;
#ifdef EXT2_CURRENT_REV
if (fs->super->s_rev_level > E2FSCK_CURRENT_REV) {
com_err(ctx->program_name, EXT2_ET_REV_TOO_HIGH,
"while trying to open %s",
ctx->filesystem_name);
get_newer:
fatal_error(ctx, "Get a newer version of e2fsck!");
}
#endif
/*
* Check for compatibility with the feature sets. We need to
* be more stringent than ext2fs_open().
*/
s = (struct ext2fs_sb *) fs->super;
if ((s->s_feature_compat & ~EXT2_LIB_FEATURE_COMPAT_SUPP) ||
(s->s_feature_incompat & ~EXT2_LIB_FEATURE_INCOMPAT_SUPP)) {
com_err(ctx->program_name, EXT2_ET_UNSUPP_FEATURE,
"(%s)", ctx->filesystem_name);
goto get_newer;
}
if (s->s_feature_ro_compat & ~EXT2_LIB_FEATURE_RO_COMPAT_SUPP) {
com_err(ctx->program_name, EXT2_ET_RO_UNSUPP_FEATURE,
"(%s)", ctx->filesystem_name);
goto get_newer;
}
/*
* If the user specified a specific superblock, presumably the
* master superblock has been trashed. So we mark the
* superblock as dirty, so it can be written out.
*/
if (ctx->superblock &&
!(ctx->options & E2F_OPT_READONLY))
ext2fs_mark_super_dirty(fs);
/*
* Don't overwrite the backup superblock and block
* descriptors, until we're sure the filesystem is OK....
*/
fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
ehandler_init(fs->io);
if (ctx->superblock)
set_latch_flags(PR_LATCH_RELOC, PRL_LATCHED, 0);
check_super_block(ctx);
if (ctx->flags & E2F_FLAG_ABORT)
exit(FSCK_ERROR);
check_if_skip(ctx);
if (bad_blocks_file)
read_bad_blocks_file(ctx, bad_blocks_file, replace_bad_blocks);
else if (cflag)
test_disk(ctx);
if (ctx->flags & E2F_FLAG_ABORT)
exit(FSCK_ERROR);
if (normalize_swapfs) {
if ((fs->flags & EXT2_FLAG_SWAP_BYTES) ==
ext2fs_native_flag()) {
fprintf(stderr, "%s: Filesystem byte order "
"already normalized.\n", ctx->device_name);
exit(FSCK_ERROR);
}
}
if (swapfs) {
swap_filesys(ctx);
if (ctx->flags & E2F_FLAG_ABORT)
exit(FSCK_ERROR);
}
/*
* Mark the system as valid, 'til proven otherwise
*/
ext2fs_mark_valid(fs);
retval = ext2fs_read_bb_inode(fs, &fs->badblocks);
if (retval) {
com_err(ctx->program_name, retval,
"while reading bad blocks inode");
preenhalt(ctx);
printf("This doesn't bode well, but we'll try to go on...\n");
}
run_result = e2fsck_run(ctx);
if (run_result == E2F_FLAG_RESTART) {
ext2fs_close(fs);
printf("Restarting e2fsck from the beginning...\n");
retval = e2fsck_reset_context(ctx);
if (retval) {
com_err(ctx->program_name, retval,
"while resetting context");
exit(1);
}
goto restart;
}
if (run_result & E2F_FLAG_ABORT)
exit(FSCK_ERROR);
if (run_result & E2F_FLAG_CANCEL)
ext2fs_unmark_valid(fs);
#ifdef MTRACE
mtrace_print("Cleanup");
#endif
if (ext2fs_test_changed(fs)) {
exit_value = FSCK_NONDESTRUCT;
if (!(ctx->options & E2F_OPT_PREEN))
printf("\n%s: ***** FILE SYSTEM WAS MODIFIED *****\n",
ctx->device_name);
if (root_filesystem && !read_only_root) {
printf("%s: ***** REBOOT LINUX *****\n",
ctx->device_name);
exit_value = FSCK_REBOOT;
}
}
if (ext2fs_test_valid(fs))
fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
else
exit_value = FSCK_UNCORRECTED;
if (!(ctx->options & E2F_OPT_READONLY)) {
if (ext2fs_test_valid(fs)) {
if (!(fs->super->s_state & EXT2_VALID_FS))
exit_value = FSCK_NONDESTRUCT;
fs->super->s_state = EXT2_VALID_FS;
} else
fs->super->s_state &= ~EXT2_VALID_FS;
fs->super->s_mnt_count = 0;
fs->super->s_lastcheck = time(NULL);
ext2fs_mark_super_dirty(fs);
}
show_stats(ctx);
e2fsck_write_bitmaps(ctx);
ext2fs_close(fs);
sync_disks();
#ifdef RESOURCE_TRACK
if (ctx->options & E2F_OPT_TIME)
print_resource_track(NULL, &ctx->global_rtrack);
#endif
e2fsck_free_context(ctx);
return exit_value;
}
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