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