/* vi: set sw=4 ts=4: */ /* * tune2fs: utility to modify EXT2 filesystem * * Busybox'ed (2009) by Vladimir Dronnikov <dronnikov@gmail.com> * * Licensed under GPLv2, see file LICENSE in this source tree. */ //config:config TUNE2FS //config: bool "tune2fs (4.4 kb)" //config: default n # off: it is too limited compared to upstream version //config: help //config: tune2fs allows the system administrator to adjust various tunable //config: filesystem parameters on Linux ext2/ext3 filesystems. //applet:IF_TUNE2FS(APPLET_NOEXEC(tune2fs, tune2fs, BB_DIR_SBIN, BB_SUID_DROP, tune2fs)) //TODO alias to "tune2fs -L LABEL": //applet:IF_E2LABEL(APPLET_ODDNAME(e2label, tune2fs, BB_DIR_SBIN, BB_SUID_DROP, e2label)) //kbuild:lib-$(CONFIG_TUNE2FS) += tune2fs.o //usage:#define tune2fs_trivial_usage //usage: "[-c MAX_MOUNT_COUNT] " ////usage: "[-e errors-behavior] [-g group] " //usage: "[-i DAYS] " ////usage: "[-j] [-J journal-options] [-l] [-s sparse-flag] " ////usage: "[-m reserved-blocks-percent] [-o [^]mount-options[,...]] " ////usage: "[-r reserved-blocks-count] [-u user] " //usage: "[-C MOUNT_COUNT] " //usage: "[-L LABEL] " ////usage: "[-M last-mounted-dir] [-O [^]feature[,...]] " ////usage: "[-T last-check-time] [-U UUID] " //usage: "BLOCKDEV" //usage: //usage:#define tune2fs_full_usage "\n\n" //usage: "Adjust filesystem options on ext[23] filesystems" #include "libbb.h" #include <linux/fs.h> #include "bb_e2fs_defs.h" // storage helpers char BUG_wrong_field_size(void); #define STORE_LE(field, value) \ do { \ if (sizeof(field) == 4) \ field = SWAP_LE32(value); \ else if (sizeof(field) == 2) \ field = SWAP_LE16(value); \ else if (sizeof(field) == 1) \ field = (value); \ else \ BUG_wrong_field_size(); \ } while (0) #define FETCH_LE32(field) \ (sizeof(field) == 4 ? SWAP_LE32(field) : BUG_wrong_field_size()) enum { OPT_L = 1 << 0, // label OPT_c = 1 << 1, // max mount count OPT_i = 1 << 2, // check interval OPT_C = 1 << 3, // current mount count }; int tune2fs_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int tune2fs_main(int argc UNUSED_PARAM, char **argv) { unsigned opts; const char *label, *str_c, *str_i, *str_C; struct ext2_super_block *sb; int fd; opts = getopt32(argv, "^" "L:c:i:C:" "\0" "=1", &label, &str_c, &str_i, &str_C); if (!opts) bb_show_usage(); argv += optind; // argv[0] -- device // read superblock fd = xopen(argv[0], O_RDWR); xlseek(fd, 1024, SEEK_SET); sb = xzalloc(1024); xread(fd, sb, 1024); // mangle superblock //STORE_LE(sb->s_wtime, time(NULL)); - why bother? if (opts & OPT_C) { int n = xatoi_range(str_C, 1, 0xfffe); STORE_LE(sb->s_mnt_count, (unsigned)n); } // set the label if (opts & OPT_L) safe_strncpy((char *)sb->s_volume_name, label, sizeof(sb->s_volume_name)); if (opts & OPT_c) { int n = xatoi_range(str_c, -1, 0xfffe); if (n == 0) n = -1; STORE_LE(sb->s_max_mnt_count, (unsigned)n); } if (opts & OPT_i) { unsigned n = xatou_range(str_i, 0, (unsigned)0xffffffff / (24*60*60)) * 24*60*60; STORE_LE(sb->s_checkinterval, n); } // write superblock xlseek(fd, 1024, SEEK_SET); xwrite(fd, sb, 1024); if (ENABLE_FEATURE_CLEAN_UP) { free(sb); } xclose(fd); return EXIT_SUCCESS; }