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/* vi: set sw=4 ts=4: */
/*
* util.c --- helper functions used by tune2fs and mke2fs
*
* Copyright 1995, 1996, 1997, 1998, 1999, 2000 by Theodore Ts'o.
*
* Licensed under GPLv2, see file LICENSE in this tarball for details.
*/
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <linux/major.h>
#include <sys/stat.h>
#include "e2fsbb.h"
#include "e2p/e2p.h"
#include "ext2fs/ext2_fs.h"
#include "ext2fs/ext2fs.h"
#include "blkid/blkid.h"
#include "util.h"
void proceed_question(void)
{
fputs("Proceed anyway? (y,n) ", stdout);
if (bb_ask_confirmation() == 0)
exit(1);
}
void check_plausibility(const char *device, int force)
{
int val;
struct stat s;
val = stat(device, &s);
if (force)
return;
if (val == -1)
bb_perror_msg_and_die("cannot stat %s", device);
if (!S_ISBLK(s.st_mode)) {
printf("%s is not a block special device.\n", device);
proceed_question();
return;
}
#ifdef HAVE_LINUX_MAJOR_H
#ifndef MAJOR
#define MAJOR(dev) ((dev)>>8)
#define MINOR(dev) ((dev) & 0xff)
#endif
#ifndef SCSI_BLK_MAJOR
#ifdef SCSI_DISK0_MAJOR
#ifdef SCSI_DISK8_MAJOR
#define SCSI_DISK_MAJOR(M) ((M) == SCSI_DISK0_MAJOR || \
((M) >= SCSI_DISK1_MAJOR && (M) <= SCSI_DISK7_MAJOR) || \
((M) >= SCSI_DISK8_MAJOR && (M) <= SCSI_DISK15_MAJOR))
#else
#define SCSI_DISK_MAJOR(M) ((M) == SCSI_DISK0_MAJOR || \
((M) >= SCSI_DISK1_MAJOR && (M) <= SCSI_DISK7_MAJOR))
#endif /* defined(SCSI_DISK8_MAJOR) */
#define SCSI_BLK_MAJOR(M) (SCSI_DISK_MAJOR((M)) || (M) == SCSI_CDROM_MAJOR)
#else
#define SCSI_BLK_MAJOR(M) ((M) == SCSI_DISK_MAJOR || (M) == SCSI_CDROM_MAJOR)
#endif /* defined(SCSI_DISK0_MAJOR) */
#endif /* defined(SCSI_BLK_MAJOR) */
if (((MAJOR(s.st_rdev) == HD_MAJOR &&
MINOR(s.st_rdev)%64 == 0) ||
(SCSI_BLK_MAJOR(MAJOR(s.st_rdev)) &&
MINOR(s.st_rdev)%16 == 0))) {
printf("%s is entire device, not just one partition!\n", device);
proceed_question();
}
#endif
}
void check_mount(const char *device, int force, const char *type)
{
errcode_t retval;
int mount_flags;
retval = ext2fs_check_if_mounted(device, &mount_flags);
if (retval) {
bb_error_msg("cannot determine if %s is mounted", device);
return;
}
if (mount_flags & EXT2_MF_MOUNTED) {
bb_error_msg("%s is mounted !", device);
force_check:
if (force)
bb_error_msg("badblocks forced anyways");
else
bb_error_msg_and_die("it's not safe to run badblocks!");
}
if (mount_flags & EXT2_MF_BUSY) {
bb_error_msg("%s is apparently in use by the system", device);
goto force_check;
}
}
void parse_journal_opts(char **journal_device, int *journal_flags,
int *journal_size, const char *opts)
{
char *buf, *token, *next, *p, *arg;
int journal_usage = 0;
buf = xstrdup(opts);
for (token = buf; token && *token; token = next) {
p = strchr(token, ',');
next = 0;
if (p) {
*p = 0;
next = p+1;
}
arg = strchr(token, '=');
if (arg) {
*arg = 0;
arg++;
}
if (strcmp(token, "device") == 0) {
*journal_device = blkid_get_devname(NULL, arg, NULL);
if (!journal_device) {
journal_usage++;
continue;
}
} else if (strcmp(token, "size") == 0) {
if (!arg) {
journal_usage++;
continue;
}
(*journal_size) = strtoul(arg, &p, 0);
if (*p)
journal_usage++;
} else if (strcmp(token, "v1_superblock") == 0) {
(*journal_flags) |= EXT2_MKJOURNAL_V1_SUPER;
continue;
} else
journal_usage++;
}
if (journal_usage)
bb_error_msg_and_die(
"\nBad journal options specified.\n\n"
"Journal options are separated by commas, "
"and may take an argument which\n"
"\tis set off by an equals ('=') sign.\n\n"
"Valid journal options are:\n"
"\tsize=<journal size in megabytes>\n"
"\tdevice=<journal device>\n\n"
"The journal size must be between "
"1024 and 102400 filesystem blocks.\n\n");
}
/*
* Determine the number of journal blocks to use, either via
* user-specified # of megabytes, or via some intelligently selected
* defaults.
*
* Find a reasonable journal file size (in blocks) given the number of blocks
* in the filesystem. For very small filesystems, it is not reasonable to
* have a journal that fills more than half of the filesystem.
*/
int figure_journal_size(int size, ext2_filsys fs)
{
blk_t j_blocks;
if (fs->super->s_blocks_count < 2048) {
bb_error_msg("Filesystem too small for a journal");
return 0;
}
if (size >= 0) {
j_blocks = size * 1024 / (fs->blocksize / 1024);
if (j_blocks < 1024 || j_blocks > 102400)
bb_error_msg_and_die("\nThe requested journal "
"size is %d blocks;\n it must be "
"between 1024 and 102400 blocks; Aborting",
j_blocks);
if (j_blocks > fs->super->s_free_blocks_count)
bb_error_msg_and_die("Journal size too big for filesystem");
return j_blocks;
}
if (fs->super->s_blocks_count < 32768)
j_blocks = 1024;
else if (fs->super->s_blocks_count < 256*1024)
j_blocks = 4096;
else if (fs->super->s_blocks_count < 512*1024)
j_blocks = 8192;
else if (fs->super->s_blocks_count < 1024*1024)
j_blocks = 16384;
else
j_blocks = 32768;
return j_blocks;
}
void print_check_message(ext2_filsys fs)
{
printf("This filesystem will be automatically "
"checked every %d mounts or\n"
"%g days, whichever comes first. "
"Use tune2fs -c or -i to override.\n",
fs->super->s_max_mnt_count,
(double)fs->super->s_checkinterval / (3600 * 24));
}
void make_journal_device(char *journal_device, ext2_filsys fs, int quiet, int force)
{
errcode_t retval;
ext2_filsys jfs;
io_manager io_ptr;
check_plausibility(journal_device, force);
check_mount(journal_device, force, "journal");
io_ptr = unix_io_manager;
retval = ext2fs_open(journal_device, EXT2_FLAG_RW|
EXT2_FLAG_JOURNAL_DEV_OK, 0,
fs->blocksize, io_ptr, &jfs);
if (retval)
bb_error_msg_and_die("cannot journal device %s", journal_device);
if (!quiet)
printf("Adding journal to device %s: ", journal_device);
fflush(stdout);
retval = ext2fs_add_journal_device(fs, jfs);
if (retval)
bb_error_msg_and_die("\nFailed to add journal to device %s", journal_device);
if (!quiet)
puts("done");
ext2fs_close(jfs);
}
void make_journal_blocks(ext2_filsys fs, int journal_size, int journal_flags, int quiet)
{
unsigned long journal_blocks;
errcode_t retval;
journal_blocks = figure_journal_size(journal_size, fs);
if (!journal_blocks) {
fs->super->s_feature_compat &=
~EXT3_FEATURE_COMPAT_HAS_JOURNAL;
return;
}
if (!quiet)
printf("Creating journal (%ld blocks): ", journal_blocks);
fflush(stdout);
retval = ext2fs_add_journal_inode(fs, journal_blocks,
journal_flags);
if (retval)
bb_error_msg_and_die("cannot create journal");
if (!quiet)
puts("done");
}
char *e2fs_set_sbin_path(void)
{
char *oldpath = getenv("PATH");
/* Update our PATH to include /sbin */
#define PATH_SET "/sbin"
if (oldpath)
oldpath = xasprintf("%s:%s", PATH_SET, oldpath);
else
oldpath = PATH_SET;
putenv(oldpath);
return oldpath;
}
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