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72 lines
1.6 KiB
C
72 lines
1.6 KiB
C
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/* vi: set sw=4 ts=4: */
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/*
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* tune2fs: utility to modify EXT2 filesystem
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*
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* Busybox'ed (2009) by Vladimir Dronnikov <dronnikov@gmail.com>
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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 "libbb.h"
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#include <linux/fs.h>
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#include <linux/ext2_fs.h>
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#include "volume_id/volume_id_internal.h"
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// storage helpers
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char BUG_wrong_field_size(void);
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#define STORE_LE(field, value) \
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do { \
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if (sizeof(field) == 4) \
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field = cpu_to_le32(value); \
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else if (sizeof(field) == 2) \
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field = cpu_to_le16(value); \
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else if (sizeof(field) == 1) \
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field = (value); \
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else \
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BUG_wrong_field_size(); \
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} while (0)
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#define FETCH_LE32(field) \
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(sizeof(field) == 4 ? cpu_to_le32(field) : BUG_wrong_field_size())
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enum {
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OPT_L = 1 << 0, // label
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};
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int tune2fs_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int tune2fs_main(int argc UNUSED_PARAM, char **argv)
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{
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unsigned opts;
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const char *label;
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struct ext2_super_block *sb;
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int fd;
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opt_complementary = "=1";
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opts = getopt32(argv, "L:", &label);
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argv += optind; // argv[0] -- device
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if (!opts)
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bb_show_usage();
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// read superblock
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fd = xopen(argv[0], O_RDWR);
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xlseek(fd, 1024, SEEK_SET);
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sb = xzalloc(1024);
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xread(fd, sb, 1024);
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// mangle superblock
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//STORE_LE(sb->s_wtime, time(NULL)); - why bother?
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// set the label
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if (1 /*opts & OPT_L*/)
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safe_strncpy((char *)sb->s_volume_name, label, sizeof(sb->s_volume_name));
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// write superblock
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xlseek(fd, 1024, SEEK_SET);
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xwrite(fd, sb, 1024);
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if (ENABLE_FEATURE_CLEAN_UP) {
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free(sb);
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}
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xclose(fd);
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return EXIT_SUCCESS;
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}
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