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hush/e2fsprogs/tune2fs.c

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/*
* tune2fs.c - Change the file system parameters on an ext2 file system
*
* Copyright (C) 1992, 1993, 1994 Remy Card <card@masi.ibp.fr>
* Laboratoire MASI, Institut Blaise Pascal
* Universite Pierre et Marie Curie (Paris VI)
*
* Copyright 1995, 1996, 1997, 1998, 1999, 2000 by Theodore Ts'o.
*
* %Begin-Header%
* This file may be redistributed under the terms of the GNU Public
* License.
* %End-Header%
*/
/*
* History:
* 93/06/01 - Creation
* 93/10/31 - Added the -c option to change the maximal mount counts
* 93/12/14 - Added -l flag to list contents of superblock
* M.J.E. Mol (marcel@duteca.et.tudelft.nl)
* F.W. ten Wolde (franky@duteca.et.tudelft.nl)
* 93/12/29 - Added the -e option to change errors behavior
* 94/02/27 - Ported to use the ext2fs library
* 94/03/06 - Added the checks interval from Uwe Ohse (uwe@tirka.gun.de)
*/
#include <sys/types.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <getopt.h>
#include "e2fsbb.h"
#include "ext2fs/ext2_fs.h"
#include "ext2fs/ext2fs.h"
#include "uuid/uuid.h"
#include "e2p/e2p.h"
#include "ext2fs/jfs_user.h"
#include "util.h"
#include "blkid/blkid.h"
#include "busybox.h"
#include "grp_.h"
#include "pwd_.h"
static char * device_name = NULL;
static char * new_label, *new_last_mounted, *new_UUID;
static char * io_options;
static int c_flag, C_flag, e_flag, f_flag, g_flag, i_flag, l_flag, L_flag;
static int m_flag, M_flag, r_flag, s_flag = -1, u_flag, U_flag, T_flag;
static time_t last_check_time;
static int print_label;
static int max_mount_count, mount_count, mount_flags;
static unsigned long interval, reserved_ratio, reserved_blocks;
static unsigned long resgid, resuid;
static unsigned short errors;
static int open_flag;
static char *features_cmd;
static char *mntopts_cmd;
static int journal_size, journal_flags;
static char *journal_device = NULL;
static const char *please_fsck = "Please run e2fsck on the filesystem\n";
static __u32 ok_features[3] = {
EXT3_FEATURE_COMPAT_HAS_JOURNAL | EXT2_FEATURE_COMPAT_DIR_INDEX,
EXT2_FEATURE_INCOMPAT_FILETYPE,
EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER
};
/*
* Remove an external journal from the filesystem
*/
static void remove_journal_device(ext2_filsys fs)
{
char *journal_path;
ext2_filsys jfs;
char buf[1024];
journal_superblock_t *jsb;
int i, nr_users;
errcode_t retval;
int commit_remove_journal = 0;
io_manager io_ptr;
if (f_flag)
commit_remove_journal = 1; /* force removal even if error */
uuid_unparse(fs->super->s_journal_uuid, buf);
journal_path = blkid_get_devname(NULL, "UUID", buf);
if (!journal_path) {
journal_path =
ext2fs_find_block_device(fs->super->s_journal_dev);
if (!journal_path)
return;
}
io_ptr = unix_io_manager;
retval = ext2fs_open(journal_path, EXT2_FLAG_RW|
EXT2_FLAG_JOURNAL_DEV_OK, 0,
fs->blocksize, io_ptr, &jfs);
if (retval) {
bb_error_msg("Failed to open external journal");
goto no_valid_journal;
}
if (!(jfs->super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
bb_error_msg("%s is not a journal device", journal_path);
goto no_valid_journal;
}
/* Get the journal superblock */
if ((retval = io_channel_read_blk(jfs->io, 1, -1024, buf))) {
bb_error_msg("Failed to read journal superblock");
goto no_valid_journal;
}
jsb = (journal_superblock_t *) buf;
if ((jsb->s_header.h_magic != (unsigned) ntohl(JFS_MAGIC_NUMBER)) ||
(jsb->s_header.h_blocktype != (unsigned) ntohl(JFS_SUPERBLOCK_V2))) {
bb_error_msg("Journal superblock not found!");
goto no_valid_journal;
}
/* Find the filesystem UUID */
nr_users = ntohl(jsb->s_nr_users);
for (i=0; i < nr_users; i++) {
if (memcmp(fs->super->s_uuid,
&jsb->s_users[i*16], 16) == 0)
break;
}
if (i >= nr_users) {
bb_error_msg("Filesystem's UUID not found on journal device");
commit_remove_journal = 1;
goto no_valid_journal;
}
nr_users--;
for (i=0; i < nr_users; i++)
memcpy(&jsb->s_users[i*16], &jsb->s_users[(i+1)*16], 16);
jsb->s_nr_users = htonl(nr_users);
/* Write back the journal superblock */
if ((retval = io_channel_write_blk(jfs->io, 1, -1024, buf))) {
bb_error_msg("Failed to write journal superblock");
goto no_valid_journal;
}
commit_remove_journal = 1;
no_valid_journal:
if (commit_remove_journal == 0)
bb_error_msg_and_die("Journal NOT removed");
fs->super->s_journal_dev = 0;
uuid_clear(fs->super->s_journal_uuid);
ext2fs_mark_super_dirty(fs);
puts("Journal removed");
free(journal_path);
}
/* Helper function for remove_journal_inode */
static int release_blocks_proc(ext2_filsys fs, blk_t *blocknr,
int blockcnt EXT2FS_ATTR((unused)),
void *private EXT2FS_ATTR((unused)))
{
blk_t block;
int group;
block = *blocknr;
ext2fs_unmark_block_bitmap(fs->block_map,block);
group = ext2fs_group_of_blk(fs, block);
fs->group_desc[group].bg_free_blocks_count++;
fs->super->s_free_blocks_count++;
return 0;
}
/*
* Remove the journal inode from the filesystem
*/
static void remove_journal_inode(ext2_filsys fs)
{
struct ext2_inode inode;
errcode_t retval;
ino_t ino = fs->super->s_journal_inum;
char *msg = "to read";
char *s = "journal inode";
retval = ext2fs_read_inode(fs, ino, &inode);
if (retval)
goto REMOVE_JOURNAL_INODE_ERROR;
if (ino == EXT2_JOURNAL_INO) {
retval = ext2fs_read_bitmaps(fs);
if (retval) {
msg = "to read bitmaps";
s = "";
goto REMOVE_JOURNAL_INODE_ERROR;
}
retval = ext2fs_block_iterate(fs, ino, 0, NULL,
release_blocks_proc, NULL);
if (retval) {
msg = "clearing";
goto REMOVE_JOURNAL_INODE_ERROR;
}
memset(&inode, 0, sizeof(inode));
ext2fs_mark_bb_dirty(fs);
fs->flags &= ~EXT2_FLAG_SUPER_ONLY;
} else
inode.i_flags &= ~EXT2_IMMUTABLE_FL;
retval = ext2fs_write_inode(fs, ino, &inode);
if (retval) {
msg = "writing";
REMOVE_JOURNAL_INODE_ERROR:
bb_error_msg_and_die("Failed %s %s", msg, s);
}
fs->super->s_journal_inum = 0;
ext2fs_mark_super_dirty(fs);
}
/*
* Update the default mount options
*/
static void update_mntopts(ext2_filsys fs, char *mntopts)
{
struct ext2_super_block *sb= fs->super;
if (e2p_edit_mntopts(mntopts, &sb->s_default_mount_opts, ~0))
bb_error_msg_and_die("Invalid mount option set: %s", mntopts);
ext2fs_mark_super_dirty(fs);
}
/*
* Update the feature set as provided by the user.
*/
static void update_feature_set(ext2_filsys fs, char *features)
{
int sparse, old_sparse, filetype, old_filetype;
int journal, old_journal, dxdir, old_dxdir;
struct ext2_super_block *sb= fs->super;
__u32 old_compat, old_incompat, old_ro_compat;
old_compat = sb->s_feature_compat;
old_ro_compat = sb->s_feature_ro_compat;
old_incompat = sb->s_feature_incompat;
old_sparse = sb->s_feature_ro_compat &
EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
old_filetype = sb->s_feature_incompat &
EXT2_FEATURE_INCOMPAT_FILETYPE;
old_journal = sb->s_feature_compat &
EXT3_FEATURE_COMPAT_HAS_JOURNAL;
old_dxdir = sb->s_feature_compat &
EXT2_FEATURE_COMPAT_DIR_INDEX;
if (e2p_edit_feature(features, &sb->s_feature_compat, ok_features))
bb_error_msg_and_die("Invalid filesystem option set: %s", features);
sparse = sb->s_feature_ro_compat &
EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
filetype = sb->s_feature_incompat &
EXT2_FEATURE_INCOMPAT_FILETYPE;
journal = sb->s_feature_compat &
EXT3_FEATURE_COMPAT_HAS_JOURNAL;
dxdir = sb->s_feature_compat &
EXT2_FEATURE_COMPAT_DIR_INDEX;
if (old_journal && !journal) {
if ((mount_flags & EXT2_MF_MOUNTED) &&
!(mount_flags & EXT2_MF_READONLY)) {
bb_error_msg_and_die(
"The has_journal flag may only be "
"cleared when the filesystem is\n"
"unmounted or mounted "
"read-only");
}
if (sb->s_feature_incompat &
EXT3_FEATURE_INCOMPAT_RECOVER) {
bb_error_msg_and_die(
"The needs_recovery flag is set. "
"%s before clearing the has_journal flag.",
please_fsck);
}
if (sb->s_journal_inum) {
remove_journal_inode(fs);
}
if (sb->s_journal_dev) {
remove_journal_device(fs);
}
}
if (journal && !old_journal) {
/*
* If adding a journal flag, let the create journal
* code below handle creating setting the flag and
* creating the journal. We supply a default size if
* necessary.
*/
if (!journal_size)
journal_size = -1;
sb->s_feature_compat &= ~EXT3_FEATURE_COMPAT_HAS_JOURNAL;
}
if (dxdir && !old_dxdir) {
if (!sb->s_def_hash_version)
sb->s_def_hash_version = EXT2_HASH_TEA;
if (uuid_is_null((unsigned char *) sb->s_hash_seed))
uuid_generate((unsigned char *) sb->s_hash_seed);
}
if (sb->s_rev_level == EXT2_GOOD_OLD_REV &&
(sb->s_feature_compat || sb->s_feature_ro_compat ||
sb->s_feature_incompat))
ext2fs_update_dynamic_rev(fs);
if ((sparse != old_sparse) ||
(filetype != old_filetype)) {
sb->s_state &= ~EXT2_VALID_FS;
printf("\n%s\n", please_fsck);
}
if ((old_compat != sb->s_feature_compat) ||
(old_ro_compat != sb->s_feature_ro_compat) ||
(old_incompat != sb->s_feature_incompat))
ext2fs_mark_super_dirty(fs);
}
/*
* Add a journal to the filesystem.
*/
static void add_journal(ext2_filsys fs)
{
if (fs->super->s_feature_compat &
EXT3_FEATURE_COMPAT_HAS_JOURNAL) {
bb_error_msg_and_die("The filesystem already has a journal");
}
if (journal_device) {
make_journal_device(journal_device, fs, 0, 0);
} else if (journal_size) {
make_journal_blocks(fs, journal_size, journal_flags, 0);
/*
* If the filesystem wasn't mounted, we need to force
* the block group descriptors out.
*/
if ((mount_flags & EXT2_MF_MOUNTED) == 0)
fs->flags &= ~EXT2_FLAG_SUPER_ONLY;
}
print_check_message(fs);
return;
}
/*
* Busybox stuff
*/
static char * x_blkid_get_devname(const char *token)
{
char * dev_name;
if (!(dev_name = blkid_get_devname(NULL, token, NULL)))
bb_error_msg_and_die("Unable to resolve '%s'", token);
return dev_name;
}
#ifdef CONFIG_E2LABEL
static void parse_e2label_options(int argc, char ** argv)
{
if ((argc < 2) || (argc > 3))
bb_show_usage();
io_options = strchr(argv[1], '?');
if (io_options)
*io_options++ = 0;
device_name = x_blkid_get_devname(argv[1]);
if (argc == 3) {
open_flag = EXT2_FLAG_RW | EXT2_FLAG_JOURNAL_DEV_OK;
L_flag = 1;
new_label = argv[2];
} else
print_label++;
}
#else
#define parse_e2label_options(x,y)
#endif
static time_t parse_time(char *str)
{
struct tm ts;
if (strcmp(str, "now") == 0) {
return (time(0));
}
memset(&ts, 0, sizeof(ts));
#ifdef HAVE_STRPTIME
strptime(str, "%Y%m%d%H%M%S", &ts);
#else
sscanf(str, "%4d%2d%2d%2d%2d%2d", &ts.tm_year, &ts.tm_mon,
&ts.tm_mday, &ts.tm_hour, &ts.tm_min, &ts.tm_sec);
ts.tm_year -= 1900;
ts.tm_mon -= 1;
if (ts.tm_year < 0 || ts.tm_mon < 0 || ts.tm_mon > 11 ||
ts.tm_mday < 0 || ts.tm_mday > 31 || ts.tm_hour > 23 ||
ts.tm_min > 59 || ts.tm_sec > 61)
ts.tm_mday = 0;
#endif
if (ts.tm_mday == 0) {
bb_error_msg_and_die("Couldn't parse date/time specifier: %s", str);
}
return (mktime(&ts));
}
static void parse_tune2fs_options(int argc, char **argv)
{
int c;
char * tmp;
printf("tune2fs %s (%s)\n", E2FSPROGS_VERSION, E2FSPROGS_DATE);
while ((c = getopt(argc, argv, "c:e:fg:i:jlm:o:r:s:u:C:J:L:M:O:T:U:")) != EOF)
switch (c)
{
case 'c':
if (safe_strtoi(optarg, &max_mount_count) || max_mount_count > 16000) {
goto MOUNTS_COUNT_ERROR;
}
if (max_mount_count == 0)
max_mount_count = -1;
c_flag = 1;
open_flag = EXT2_FLAG_RW;
break;
case 'C':
if (safe_strtoi(optarg, &mount_count) || mount_count > 16000) {
MOUNTS_COUNT_ERROR:
bb_error_msg_and_die("bad mounts count - %s", optarg);
}
C_flag = 1;
open_flag = EXT2_FLAG_RW;
break;
case 'e':
if (strcmp (optarg, "continue") == 0)
errors = EXT2_ERRORS_CONTINUE;
else if (strcmp (optarg, "remount-ro") == 0)
errors = EXT2_ERRORS_RO;
else if (strcmp (optarg, "panic") == 0)
errors = EXT2_ERRORS_PANIC;
else {
bb_error_msg_and_die("bad error behavior - %s", optarg);
}
e_flag = 1;
open_flag = EXT2_FLAG_RW;
break;
case 'f': /* Force */
f_flag = 1;
break;
case 'g':
if (safe_strtoul(optarg, &resgid))
resgid = bb_xgetgrnam(optarg);
g_flag = 1;
open_flag = EXT2_FLAG_RW;
break;
case 'i':
interval = strtoul (optarg, &tmp, 0);
switch (*tmp) {
case 's':
tmp++;
break;
case '\0':
case 'd':
case 'D': /* days */
interval *= 86400;
if (*tmp != '\0')
tmp++;
break;
case 'm':
case 'M': /* months! */
interval *= 86400 * 30;
tmp++;
break;
case 'w':
case 'W': /* weeks */
interval *= 86400 * 7;
tmp++;
break;
}
if (*tmp || interval > (365 * 86400)) {
bb_error_msg_and_die("bad interval - %s", optarg);
}
i_flag = 1;
open_flag = EXT2_FLAG_RW;
break;
case 'j':
if (!journal_size)
journal_size = -1;
open_flag = EXT2_FLAG_RW;
break;
case 'J':
parse_journal_opts(&journal_device, &journal_flags, &journal_size, optarg);
open_flag = EXT2_FLAG_RW;
break;
case 'l':
l_flag = 1;
break;
case 'L':
new_label = optarg;
L_flag = 1;
open_flag = EXT2_FLAG_RW |
EXT2_FLAG_JOURNAL_DEV_OK;
break;
case 'm':
if(safe_strtoul(optarg, &reserved_ratio) || reserved_ratio > 50) {
bb_error_msg_and_die("bad reserved block ratio - %s", optarg);
}
m_flag = 1;
open_flag = EXT2_FLAG_RW;
break;
case 'M':
new_last_mounted = optarg;
M_flag = 1;
open_flag = EXT2_FLAG_RW;
break;
case 'o':
if (mntopts_cmd) {
bb_error_msg_and_die("-o may only be specified once");
}
mntopts_cmd = optarg;
open_flag = EXT2_FLAG_RW;
break;
case 'O':
if (features_cmd) {
bb_error_msg_and_die("-O may only be specified once");
}
features_cmd = optarg;
open_flag = EXT2_FLAG_RW;
break;
case 'r':
if(safe_strtoul(optarg, &reserved_blocks)) {
bb_error_msg_and_die("bad reserved blocks count - %s", optarg);
}
r_flag = 1;
open_flag = EXT2_FLAG_RW;
break;
case 's':
s_flag = atoi(optarg);
open_flag = EXT2_FLAG_RW;
break;
case 'T':
T_flag = 1;
last_check_time = parse_time(optarg);
open_flag = EXT2_FLAG_RW;
break;
case 'u':
if (safe_strtoul(optarg, &resuid))
resuid = bb_xgetpwnam(optarg);
u_flag = 1;
open_flag = EXT2_FLAG_RW;
break;
case 'U':
new_UUID = optarg;
U_flag = 1;
open_flag = EXT2_FLAG_RW |
EXT2_FLAG_JOURNAL_DEV_OK;
break;
default:
bb_show_usage();
}
if (optind < argc - 1 || optind == argc)
bb_show_usage();
if (!open_flag && !l_flag)
bb_show_usage();
io_options = strchr(argv[optind], '?');
if (io_options)
*io_options++ = 0;
device_name = x_blkid_get_devname(argv[optind]);
}
#ifdef CONFIG_FINDFS
static attribute_noreturn void do_findfs(int argc, char **argv)
{
if ((argc != 2) ||
(strncmp(argv[1], "LABEL=", 6) && strncmp(argv[1], "UUID=", 5)))
bb_show_usage();
device_name = x_blkid_get_devname(argv[1]);
puts(device_name);
exit(0);
}
#else
#define do_findfs(x, y)
#endif
static void clean_up(void)
{
if (ENABLE_FEATURE_CLEAN_UP && device_name) free(device_name);
if (ENABLE_FEATURE_CLEAN_UP && journal_device) free(journal_device);
}
int tune2fs_main(int argc, char **argv)
{
errcode_t retval;
ext2_filsys fs;
struct ext2_super_block *sb;
io_manager io_ptr;
if (ENABLE_FEATURE_CLEAN_UP)
atexit(clean_up);
if (ENABLE_FINDFS && (bb_applet_name[0] == 'f')) /* findfs */
do_findfs(argc, argv); /* no return */
else if (ENABLE_E2LABEL && (bb_applet_name[0] == 'e')) /* e2label */
parse_e2label_options(argc, argv);
else
parse_tune2fs_options(argc, argv); /* tune2fs */
io_ptr = unix_io_manager;
retval = ext2fs_open2(device_name, io_options, open_flag,
0, 0, io_ptr, &fs);
if (retval)
bb_error_msg_and_die("No valid superblock on %s", device_name);
sb = fs->super;
if (print_label) {
/* For e2label emulation */
printf("%.*s\n", (int) sizeof(sb->s_volume_name),
sb->s_volume_name);
return 0;
}
retval = ext2fs_check_if_mounted(device_name, &mount_flags);
if (retval)
bb_error_msg_and_die("Could not determine if %s is mounted", device_name);
/* Normally we only need to write out the superblock */
fs->flags |= EXT2_FLAG_SUPER_ONLY;
if (c_flag) {
sb->s_max_mnt_count = max_mount_count;
ext2fs_mark_super_dirty(fs);
printf("Setting maximal mount count to %d\n", max_mount_count);
}
if (C_flag) {
sb->s_mnt_count = mount_count;
ext2fs_mark_super_dirty(fs);
printf("Setting current mount count to %d\n", mount_count);
}
if (e_flag) {
sb->s_errors = errors;
ext2fs_mark_super_dirty(fs);
printf("Setting error behavior to %d\n", errors);
}
if (g_flag) {
sb->s_def_resgid = resgid;
ext2fs_mark_super_dirty(fs);
printf("Setting reserved blocks gid to %lu\n", resgid);
}
if (i_flag) {
sb->s_checkinterval = interval;
ext2fs_mark_super_dirty(fs);
printf("Setting interval between check %lu seconds\n", interval);
}
if (m_flag) {
sb->s_r_blocks_count = (sb->s_blocks_count / 100)
* reserved_ratio;
ext2fs_mark_super_dirty(fs);
printf("Setting reserved blocks percentage to %lu (%u blocks)\n",
reserved_ratio, sb->s_r_blocks_count);
}
if (r_flag) {
if (reserved_blocks >= sb->s_blocks_count/2)
bb_error_msg_and_die("reserved blocks count is too big (%lu)", reserved_blocks);
sb->s_r_blocks_count = reserved_blocks;
ext2fs_mark_super_dirty(fs);
printf("Setting reserved blocks count to %lu\n", reserved_blocks);
}
if (s_flag == 1) {
if (sb->s_feature_ro_compat &
EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER)
bb_error_msg("\nThe filesystem already has sparse superblocks\n");
else {
sb->s_feature_ro_compat |=
EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
sb->s_state &= ~EXT2_VALID_FS;
ext2fs_mark_super_dirty(fs);
printf("\nSparse superblock flag set. %s", please_fsck);
}
}
if (s_flag == 0) {
if (!(sb->s_feature_ro_compat &
EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER))
bb_error_msg("\nThe filesystem already has sparse superblocks disabled\n");
else {
sb->s_feature_ro_compat &=
~EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
sb->s_state &= ~EXT2_VALID_FS;
fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
ext2fs_mark_super_dirty(fs);
printf("\nSparse superblock flag cleared. %s", please_fsck);
}
}
if (T_flag) {
sb->s_lastcheck = last_check_time;
ext2fs_mark_super_dirty(fs);
printf("Setting time filesystem last checked to %s\n",
ctime(&last_check_time));
}
if (u_flag) {
sb->s_def_resuid = resuid;
ext2fs_mark_super_dirty(fs);
printf("Setting reserved blocks uid to %lu\n", resuid);
}
if (L_flag) {
if (strlen(new_label) > sizeof(sb->s_volume_name))
bb_error_msg("Warning: label too long, truncating\n");
memset(sb->s_volume_name, 0, sizeof(sb->s_volume_name));
strncpy(sb->s_volume_name, new_label,
sizeof(sb->s_volume_name));
ext2fs_mark_super_dirty(fs);
}
if (M_flag) {
memset(sb->s_last_mounted, 0, sizeof(sb->s_last_mounted));
strncpy(sb->s_last_mounted, new_last_mounted,
sizeof(sb->s_last_mounted));
ext2fs_mark_super_dirty(fs);
}
if (mntopts_cmd)
update_mntopts(fs, mntopts_cmd);
if (features_cmd)
update_feature_set(fs, features_cmd);
if (journal_size || journal_device)
add_journal(fs);
if (U_flag) {
if ((strcasecmp(new_UUID, "null") == 0) ||
(strcasecmp(new_UUID, "clear") == 0)) {
uuid_clear(sb->s_uuid);
} else if (strcasecmp(new_UUID, "time") == 0) {
uuid_generate_time(sb->s_uuid);
} else if (strcasecmp(new_UUID, "random") == 0) {
uuid_generate(sb->s_uuid);
} else if (uuid_parse(new_UUID, sb->s_uuid)) {
bb_error_msg_and_die("Invalid UUID format");
}
ext2fs_mark_super_dirty(fs);
}
if (l_flag)
list_super (sb);
return (ext2fs_close (fs) ? 1 : 0);
}
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