1 | /* ubirename - port of the ubirename from the mtd-utils package
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2 | *
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3 | * A utility to rename one UBI volume.
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4 | *
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5 | * 2016-03-01 Sven Eisenberg <sven.eisenberg@novero.com>
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6 | *
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7 | * Licensed under GPLv2, see file LICENSE in this source tree.
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8 | */
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9 | //config:config UBIRENAME
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10 | //config: bool "ubirename"
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11 | //config: default y
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12 | //config: select PLATFORM_LINUX
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13 | //config: help
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14 | //config: Utility to rename UBI volumes
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15 |
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16 | //applet:IF_UBIRENAME(APPLET(ubirename, BB_DIR_USR_SBIN, BB_SUID_DROP))
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17 |
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18 | //kbuild:lib-$(CONFIG_UBIRENAME) += ubirename.o
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19 |
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20 | //usage:#define ubirename_trivial_usage
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21 | //usage: "UBI_DEVICE OLD_VOLNAME NEW_VOLNAME [OLD2 NEW2]..."
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22 | //usage:#define ubirename_full_usage "\n\n"
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23 | //usage: "Rename UBI volumes on UBI_DEVICE"
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24 |
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25 | #include "libbb.h"
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26 | #include <mtd/mtd-user.h>
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27 |
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28 | #ifndef __packed
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29 | # define __packed __attribute__((packed))
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30 | #endif
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31 |
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32 | // from ubi-media.h
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33 | #define UBI_MAX_VOLUME_NAME 127
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34 | #define UBI_MAX_VOLUMES 128
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35 | // end ubi-media.h
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36 |
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37 | // from ubi-user.h
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38 | /* ioctl commands of UBI character devices */
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39 | #define UBI_IOC_MAGIC 'o'
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40 |
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41 | /* Re-name volumes */
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42 | #define UBI_IOCRNVOL _IOW(UBI_IOC_MAGIC, 3, struct ubi_rnvol_req)
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43 |
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44 | /* Maximum amount of UBI volumes that can be re-named at one go */
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45 | #define UBI_MAX_RNVOL 32
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46 |
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47 | struct ubi_rnvol_req {
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48 | int32_t count;
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49 | int8_t padding1[12];
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50 | struct {
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51 | int32_t vol_id;
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52 | int16_t name_len;
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53 | int8_t padding2[2];
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54 | char name[UBI_MAX_VOLUME_NAME + 1];
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55 | } ents[UBI_MAX_RNVOL];
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56 | } __packed;
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57 | // end ubi-user.h
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58 |
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59 | int ubirename_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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60 | int ubirename_main(int argc, char **argv)
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61 | {
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62 | struct ubi_rnvol_req *rnvol;
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63 | const char *ubi_devname;
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64 | unsigned ubi_devnum;
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65 | unsigned n;
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66 |
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67 | /* argc can be 4, 6, 8, ... */
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68 | if ((argc & 1) || (argc >>= 1) < 2)
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69 | bb_show_usage();
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70 |
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71 | rnvol = xzalloc(sizeof(*rnvol));
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72 | rnvol->count = --argc;
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73 | if (argc > ARRAY_SIZE(rnvol->ents))
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74 | bb_error_msg_and_die("too many renames requested");
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75 |
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76 | ubi_devname = argv[1];
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77 | ubi_devnum = ubi_devnum_from_devname(ubi_devname);
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78 |
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79 | n = 0;
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80 | argv += 2;
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81 | while (argv[0]) {
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82 | rnvol->ents[n].vol_id = ubi_get_volid_by_name(ubi_devnum, argv[0]);
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83 | rnvol->ents[n].name_len = strlen(argv[1]);
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84 | if (rnvol->ents[n].name_len >= sizeof(rnvol->ents[n].name))
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85 | bb_error_msg_and_die("new name '%s' is too long", argv[1]);
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86 | strcpy(rnvol->ents[n].name, argv[1]);
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87 | n++;
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88 | argv += 2;
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89 | }
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90 |
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91 | xioctl(xopen(ubi_devname, O_RDONLY), UBI_IOCRNVOL, rnvol);
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92 |
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93 | return 0;
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94 | }
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