[1765] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * util.c --- helper functions used by tune2fs and mke2fs
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| 4 | *
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| 5 | * Copyright 1995, 1996, 1997, 1998, 1999, 2000 by Theodore Ts'o.
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| 6 | *
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| 7 | * %Begin-Header%
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| 8 | * This file may be redistributed under the terms of the GNU Public
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| 9 | * License.
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| 10 | * %End-Header%
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| 11 | */
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| 12 |
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| 13 | #include <stdio.h>
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| 14 | #include <string.h>
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| 15 | #include <errno.h>
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| 16 | #include <linux/major.h>
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| 17 | #include <sys/stat.h>
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| 18 |
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| 19 | #include "e2fsbb.h"
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| 20 | #include "e2p/e2p.h"
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| 21 | #include "ext2fs/ext2_fs.h"
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| 22 | #include "ext2fs/ext2fs.h"
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| 23 | #include "blkid/blkid.h"
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| 24 | #include "util.h"
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| 25 |
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| 26 | void proceed_question(void)
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| 27 | {
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| 28 | fputs("Proceed anyway? (y,n) ", stdout);
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| 29 | if (bb_ask_confirmation() == 0)
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| 30 | exit(1);
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| 31 | }
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| 32 |
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| 33 | void check_plausibility(const char *device, int force)
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| 34 | {
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| 35 | int val;
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| 36 | struct stat s;
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| 37 | val = stat(device, &s);
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| 38 | if (force)
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| 39 | return;
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| 40 | if(val == -1)
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| 41 | bb_perror_msg_and_die("cannot stat %s", device);
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| 42 | if (!S_ISBLK(s.st_mode)) {
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| 43 | printf("%s is not a block special device.\n", device);
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| 44 | proceed_question();
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| 45 | return;
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| 46 | }
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| 47 |
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| 48 | #ifdef HAVE_LINUX_MAJOR_H
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| 49 | #ifndef MAJOR
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| 50 | #define MAJOR(dev) ((dev)>>8)
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| 51 | #define MINOR(dev) ((dev) & 0xff)
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| 52 | #endif
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| 53 | #ifndef SCSI_BLK_MAJOR
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| 54 | #ifdef SCSI_DISK0_MAJOR
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| 55 | #ifdef SCSI_DISK8_MAJOR
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| 56 | #define SCSI_DISK_MAJOR(M) ((M) == SCSI_DISK0_MAJOR || \
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| 57 | ((M) >= SCSI_DISK1_MAJOR && (M) <= SCSI_DISK7_MAJOR) || \
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| 58 | ((M) >= SCSI_DISK8_MAJOR && (M) <= SCSI_DISK15_MAJOR))
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| 59 | #else
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| 60 | #define SCSI_DISK_MAJOR(M) ((M) == SCSI_DISK0_MAJOR || \
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| 61 | ((M) >= SCSI_DISK1_MAJOR && (M) <= SCSI_DISK7_MAJOR))
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| 62 | #endif /* defined(SCSI_DISK8_MAJOR) */
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| 63 | #define SCSI_BLK_MAJOR(M) (SCSI_DISK_MAJOR((M)) || (M) == SCSI_CDROM_MAJOR)
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| 64 | #else
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| 65 | #define SCSI_BLK_MAJOR(M) ((M) == SCSI_DISK_MAJOR || (M) == SCSI_CDROM_MAJOR)
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| 66 | #endif /* defined(SCSI_DISK0_MAJOR) */
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| 67 | #endif /* defined(SCSI_BLK_MAJOR) */
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| 68 | if (((MAJOR(s.st_rdev) == HD_MAJOR &&
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| 69 | MINOR(s.st_rdev)%64 == 0) ||
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| 70 | (SCSI_BLK_MAJOR(MAJOR(s.st_rdev)) &&
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| 71 | MINOR(s.st_rdev)%16 == 0))) {
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| 72 | printf("%s is entire device, not just one partition!\n", device);
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| 73 | proceed_question();
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| 74 | }
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| 75 | #endif
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| 76 | }
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| 77 |
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| 78 | void check_mount(const char *device, int force, const char *type)
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| 79 | {
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| 80 | errcode_t retval;
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| 81 | int mount_flags;
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| 82 |
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| 83 | retval = ext2fs_check_if_mounted(device, &mount_flags);
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| 84 | if (retval) {
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| 85 | bb_error_msg("cannot determine if %s is mounted", device);
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| 86 | return;
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| 87 | }
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| 88 | if (mount_flags & EXT2_MF_MOUNTED) {
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| 89 | bb_error_msg("%s is mounted !", device);
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| 90 | force_check:
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| 91 | if (force)
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| 92 | bb_error_msg("badblocks forced anyways");
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| 93 | else
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| 94 | bb_error_msg_and_die("it's not safe to run badblocks!");
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| 95 | }
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| 96 |
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| 97 | if (mount_flags & EXT2_MF_BUSY) {
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| 98 | bb_error_msg("%s is apparently in use by the system", device);
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| 99 | goto force_check;
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| 100 | }
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| 101 |
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| 102 | }
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| 103 |
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| 104 | void parse_journal_opts(char **journal_device, int *journal_flags,
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| 105 | int *journal_size, const char *opts)
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| 106 | {
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| 107 | char *buf, *token, *next, *p, *arg;
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| 108 | int journal_usage = 0;
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| 109 | buf = xstrdup(opts);
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| 110 | for (token = buf; token && *token; token = next) {
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| 111 | p = strchr(token, ',');
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| 112 | next = 0;
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| 113 | if (p) {
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| 114 | *p = 0;
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| 115 | next = p+1;
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| 116 | }
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| 117 | arg = strchr(token, '=');
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| 118 | if (arg) {
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| 119 | *arg = 0;
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| 120 | arg++;
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| 121 | }
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| 122 | if (strcmp(token, "device") == 0) {
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| 123 | *journal_device = blkid_get_devname(NULL, arg, NULL);
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| 124 | if (!journal_device) {
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| 125 | journal_usage++;
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| 126 | continue;
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| 127 | }
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| 128 | } else if (strcmp(token, "size") == 0) {
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| 129 | if (!arg) {
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| 130 | journal_usage++;
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| 131 | continue;
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| 132 | }
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| 133 | (*journal_size) = strtoul(arg, &p, 0);
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| 134 | if (*p)
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| 135 | journal_usage++;
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| 136 | } else if (strcmp(token, "v1_superblock") == 0) {
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| 137 | (*journal_flags) |= EXT2_MKJOURNAL_V1_SUPER;
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| 138 | continue;
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| 139 | } else
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| 140 | journal_usage++;
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| 141 | }
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| 142 | if (journal_usage)
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| 143 | bb_error_msg_and_die(
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| 144 | "\nBad journal options specified.\n\n"
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| 145 | "Journal options are separated by commas, "
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| 146 | "and may take an argument which\n"
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| 147 | "\tis set off by an equals ('=') sign.\n\n"
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| 148 | "Valid journal options are:\n"
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| 149 | "\tsize=<journal size in megabytes>\n"
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| 150 | "\tdevice=<journal device>\n\n"
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| 151 | "The journal size must be between "
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| 152 | "1024 and 102400 filesystem blocks.\n\n");
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| 153 | }
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| 154 |
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| 155 | /*
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| 156 | * Determine the number of journal blocks to use, either via
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| 157 | * user-specified # of megabytes, or via some intelligently selected
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| 158 | * defaults.
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| 159 | *
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| 160 | * Find a reasonable journal file size (in blocks) given the number of blocks
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| 161 | * in the filesystem. For very small filesystems, it is not reasonable to
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| 162 | * have a journal that fills more than half of the filesystem.
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| 163 | */
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| 164 | int figure_journal_size(int size, ext2_filsys fs)
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| 165 | {
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| 166 | blk_t j_blocks;
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| 167 |
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| 168 | if (fs->super->s_blocks_count < 2048) {
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| 169 | bb_error_msg("Filesystem too small for a journal");
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| 170 | return 0;
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| 171 | }
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| 172 |
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| 173 | if (size >= 0) {
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| 174 | j_blocks = size * 1024 / (fs->blocksize / 1024);
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| 175 | if (j_blocks < 1024 || j_blocks > 102400)
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| 176 | bb_error_msg_and_die("\nThe requested journal "
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| 177 | "size is %d blocks;\n it must be "
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| 178 | "between 1024 and 102400 blocks; Aborting",
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| 179 | j_blocks);
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| 180 | if (j_blocks > fs->super->s_free_blocks_count)
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| 181 | bb_error_msg_and_die("Journal size too big for filesystem");
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| 182 | return j_blocks;
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| 183 | }
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| 184 |
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| 185 | if (fs->super->s_blocks_count < 32768)
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| 186 | j_blocks = 1024;
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| 187 | else if (fs->super->s_blocks_count < 256*1024)
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| 188 | j_blocks = 4096;
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| 189 | else if (fs->super->s_blocks_count < 512*1024)
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| 190 | j_blocks = 8192;
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| 191 | else if (fs->super->s_blocks_count < 1024*1024)
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| 192 | j_blocks = 16384;
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| 193 | else
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| 194 | j_blocks = 32768;
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| 195 |
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| 196 | return j_blocks;
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| 197 | }
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| 198 |
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| 199 | void print_check_message(ext2_filsys fs)
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| 200 | {
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| 201 | printf("This filesystem will be automatically "
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| 202 | "checked every %d mounts or\n"
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| 203 | "%g days, whichever comes first. "
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| 204 | "Use tune2fs -c or -i to override.\n",
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| 205 | fs->super->s_max_mnt_count,
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| 206 | (double)fs->super->s_checkinterval / (3600 * 24));
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| 207 | }
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| 208 |
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| 209 | void make_journal_device(char *journal_device, ext2_filsys fs, int quiet, int force)
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| 210 | {
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| 211 | errcode_t retval;
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| 212 | ext2_filsys jfs;
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| 213 | io_manager io_ptr;
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| 214 |
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| 215 | check_plausibility(journal_device, force);
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| 216 | check_mount(journal_device, force, "journal");
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| 217 | io_ptr = unix_io_manager;
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| 218 | retval = ext2fs_open(journal_device, EXT2_FLAG_RW|
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| 219 | EXT2_FLAG_JOURNAL_DEV_OK, 0,
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| 220 | fs->blocksize, io_ptr, &jfs);
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| 221 | if (retval)
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| 222 | bb_error_msg_and_die("cannot journal device %s", journal_device);
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| 223 | if(!quiet)
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| 224 | printf("Adding journal to device %s: ", journal_device);
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| 225 | fflush(stdout);
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| 226 | retval = ext2fs_add_journal_device(fs, jfs);
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| 227 | if(retval)
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| 228 | bb_error_msg_and_die("\nFailed to add journal to device %s", journal_device);
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| 229 | if(!quiet)
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| 230 | puts("done");
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| 231 | ext2fs_close(jfs);
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| 232 | }
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| 233 |
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| 234 | void make_journal_blocks(ext2_filsys fs, int journal_size, int journal_flags, int quiet)
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| 235 | {
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| 236 | unsigned long journal_blocks;
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| 237 | errcode_t retval;
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| 238 |
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| 239 | journal_blocks = figure_journal_size(journal_size, fs);
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| 240 | if (!journal_blocks) {
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| 241 | fs->super->s_feature_compat &=
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| 242 | ~EXT3_FEATURE_COMPAT_HAS_JOURNAL;
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| 243 | return;
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| 244 | }
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| 245 | if(!quiet)
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| 246 | printf("Creating journal (%ld blocks): ", journal_blocks);
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| 247 | fflush(stdout);
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| 248 | retval = ext2fs_add_journal_inode(fs, journal_blocks,
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| 249 | journal_flags);
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| 250 | if(retval)
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| 251 | bb_error_msg_and_die("cannot create journal");
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| 252 | if(!quiet)
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| 253 | puts("done");
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| 254 | }
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| 255 |
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| 256 | char *e2fs_set_sbin_path(void)
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| 257 | {
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| 258 | char *oldpath = getenv("PATH");
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| 259 | /* Update our PATH to include /sbin */
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| 260 | #define PATH_SET "/sbin"
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| 261 | if (oldpath)
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| 262 | oldpath = xasprintf("%s:%s", PATH_SET, oldpath);
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| 263 | else
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| 264 | oldpath = PATH_SET;
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| 265 | putenv (oldpath);
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| 266 | return oldpath;
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| 267 | }
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