initial fat tune2fs/findfs/e2label source

1 files changed, 776 insertions, 0 deletions

diff --git a/e2fsprogs/tune2fs.c b/e2fsprogs/tune2fs.c
new file mode 100644
index 0000000..e4f904e
--- /dev/null
+++ b/e2fsprogs/tune2fs.c
@@ -0,0 +1,776 @@
+/*
+ * 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 <fcntl.h>
+#include <grp.h>
+#ifdef HAVE_GETOPT_H
+#include <getopt.h>
+#else
+extern char *optarg;
+extern int optind;
+#endif
+#include <pwd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+#include <sys/types.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"
+
+static char * device_name;
+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;
+
+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;
+	
+	retval = ext2fs_read_inode(fs, ino,  &inode);
+	if (retval)
+		bb_error_msg_and_die("Failed to read journal inode");
+	if (ino == EXT2_JOURNAL_INO) {
+		retval = ext2fs_read_bitmaps(fs);
+		if (retval)
+			bb_error_msg_and_die("Failed to read bitmaps");
+		retval = ext2fs_block_iterate(fs, ino, 0, NULL,
+					      release_blocks_proc, NULL);
+		if (retval)
+			bb_error_msg_and_die("Failed clearing journal inode");
+		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)
+		bb_error_msg_and_die("Failed writing journal inode");
+	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.  "
+				"Please run e2fsck before clearing\n"
+				"the has_journal flag.");
+		}
+		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)
+{
+	unsigned long journal_blocks;
+	errcode_t	retval;
+	ext2_filsys	jfs;
+	io_manager	io_ptr;
+
+	if (fs->super->s_feature_compat &
+	    EXT3_FEATURE_COMPAT_HAS_JOURNAL) {
+		bb_error_msg("The filesystem already has a journal");
+		goto err;
+	}
+	if (journal_device) {
+		check_plausibility(journal_device);
+		check_mount(journal_device, 0, "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("Failed to open journal on %s", journal_device);
+			goto err;
+		}
+		printf("Creating journal on device %s: ", journal_device);
+		fflush(stdout);
+
+		retval = ext2fs_add_journal_device(fs, jfs);
+		ext2fs_close(jfs);
+		if (retval) {
+			bb_error_msg("Failed to add filesystem to journal on %s", journal_device);
+			goto err;
+		}
+		puts("done");
+	} else if (journal_size) {
+		fputs("Creating journal inode: ", stdout);
+		fflush(stdout);
+		journal_blocks = figure_journal_size(journal_size, fs);
+
+		retval = ext2fs_add_journal_inode(fs, journal_blocks,
+						  journal_flags);
+		if (retval)
+			bb_error_msg_and_die("Failed to create journal file");
+		else
+			puts("done");
+		/*
+		 * 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;
+
+err:
+	if (journal_device)
+		free(journal_device);
+	exit(1);
+}
+
+
+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 = blkid_get_devname(NULL, argv[1], NULL);
+	if (!device_name)
+		bb_error_msg_and_die("Unable to resolve '%s'", 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++;
+}
+
+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;
+	struct group * gr;
+	struct passwd * pw;
+
+	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':
+				max_mount_count = strtol (optarg, &tmp, 0);
+				if (*tmp || max_mount_count > 16000) {
+					bb_error_msg_and_die("bad mounts count - %s", optarg);
+				}
+				if (max_mount_count == 0)
+					max_mount_count = -1;
+				c_flag = 1;
+				open_flag = EXT2_FLAG_RW;
+				break;
+			case 'C':
+				mount_count = strtoul (optarg, &tmp, 0);
+				if (*tmp || mount_count > 16000) {
+					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':
+				resgid = strtoul (optarg, &tmp, 0);
+				if (*tmp) {
+					gr = getgrnam (optarg);
+					if (gr == NULL)
+						tmp = optarg;
+					else {
+						resgid = gr->gr_gid;
+						*tmp =0;
+					}
+				}
+				if (*tmp) {
+					bb_error_msg_and_die("bad gid/group name - %s", 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':
+				reserved_ratio = strtoul (optarg, &tmp, 0);
+				if (*tmp || 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':
+				reserved_blocks = strtoul (optarg, &tmp, 0);
+				if (*tmp) {
+					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':
+				resuid = strtoul (optarg, &tmp, 0);
+				if (*tmp) {
+					pw = getpwnam (optarg);
+					if (pw == NULL)
+						tmp = optarg;
+					else {
+						resuid = pw->pw_uid;
+						*tmp = 0;
+					}
+				}
+				if (*tmp) {
+					bb_error_msg_and_die("bad uid/user name - %s", 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 = blkid_get_devname(NULL, argv[optind], NULL);
+	if (!device_name)
+		bb_error_msg_and_die("Unable to resolve '%s'", argv[optind]);
+}
+
+static void do_findfs(int argc, char **argv)
+{
+	char *dev;
+
+	if ((argc != 2) ||
+	    (strncmp(argv[1], "LABEL=", 6) && strncmp(argv[1], "UUID=", 5)))
+		bb_show_usage();
+	dev = blkid_get_devname(NULL, argv[1], NULL);
+	if (!dev)
+		bb_error_msg_and_die("Unable to resolve '%s'", argv[1]);
+	puts(dev);
+	exit(0);
+}
+
+int tune2fs_main(int argc, char **argv)
+{
+	errcode_t retval;
+	ext2_filsys fs;
+	struct ext2_super_block *sb;
+	io_manager io_ptr;
+	char *program_name = basename(argv[0]);
+
+	if (strcmp(program_name, "findfs") == 0)
+		do_findfs(argc, argv);
+	if (strcmp(program_name, "e2label") == 0)
+		parse_e2label_options(argc, argv);
+	else
+		parse_tune2fs_options(argc, argv);
+
+	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);
+		exit(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);
+}