1 /* ubirename - port of the ubirename from the mtd-utils package
2 *
3 * A utility to rename one UBI volume.
4 *
5 * 2016-03-01 Sven Eisenberg <sven.eisenberg@novero.com>
6 *
7 * Licensed under GPLv2, see file LICENSE in this source tree.
8 */
9 //config:config UBIRENAME
10 //config: bool "ubirename (2.4 kb)"
11 //config: default y
12 //config: help
13 //config: Utility to rename UBI volumes
14
15 //applet:IF_UBIRENAME(APPLET(ubirename, BB_DIR_USR_SBIN, BB_SUID_DROP))
16 /* not NOEXEC: if flash operation stalls, use less memory in "hung" process */
17
18 //kbuild:lib-$(CONFIG_UBIRENAME) += ubirename.o
19
20 //usage:#define ubirename_trivial_usage
21 //usage: "UBI_DEVICE OLD_VOLNAME NEW_VOLNAME [OLD2 NEW2]..."
22 //usage:#define ubirename_full_usage "\n\n"
23 //usage: "Rename UBI volumes on UBI_DEVICE"
24
25 #include "libbb.h"
26 #include <mtd/mtd-user.h>
27
28 #ifndef __packed
29 # define __packed __attribute__((packed))
30 #endif
31
32 // from ubi-media.h
33 #define UBI_MAX_VOLUME_NAME 127
34 #define UBI_MAX_VOLUMES 128
35 // end ubi-media.h
36
37 // from ubi-user.h
38 /* ioctl commands of UBI character devices */
39 #define UBI_IOC_MAGIC 'o'
40
41 /* Re-name volumes */
42 #define UBI_IOCRNVOL _IOW(UBI_IOC_MAGIC, 3, struct ubi_rnvol_req)
43
44 /* Maximum amount of UBI volumes that can be re-named at one go */
45 #define UBI_MAX_RNVOL 32
46
47 struct ubi_rnvol_req {
48 int32_t count;
49 int8_t padding1[12];
50 struct {
51 int32_t vol_id;
52 int16_t name_len;
53 int8_t padding2[2];
54 char name[UBI_MAX_VOLUME_NAME + 1];
55 } ents[UBI_MAX_RNVOL];
56 } __packed;
57 // end ubi-user.h
58
59 int ubirename_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
ubirename_main(int argc,char ** argv)60 int ubirename_main(int argc, char **argv)
61 {
62 struct ubi_rnvol_req *rnvol;
63 const char *ubi_devname;
64 unsigned ubi_devnum;
65 unsigned n;
66
67 /* argc can be 4, 6, 8, ... */
68 if ((argc & 1) || (argc >>= 1) < 2)
69 bb_show_usage();
70
71 rnvol = xzalloc(sizeof(*rnvol));
72 rnvol->count = --argc;
73 if (argc > ARRAY_SIZE(rnvol->ents))
74 bb_simple_error_msg_and_die("too many renames requested");
75
76 ubi_devname = argv[1];
77 ubi_devnum = ubi_devnum_from_devname(ubi_devname);
78
79 n = 0;
80 argv += 2;
81 while (argv[0]) {
82 rnvol->ents[n].vol_id = ubi_get_volid_by_name(ubi_devnum, argv[0]);
83
84 /* strnlen avoids overflow of 16-bit field (paranoia) */
85 rnvol->ents[n].name_len = strnlen(argv[1], sizeof(rnvol->ents[n].name));
86 if (rnvol->ents[n].name_len >= sizeof(rnvol->ents[n].name))
87 bb_error_msg_and_die("new name '%s' is too long", argv[1]);
88
89 strcpy(rnvol->ents[n].name, argv[1]);
90 n++;
91 argv += 2;
92 }
93
94 xioctl(xopen(ubi_devname, O_RDONLY), UBI_IOCRNVOL, rnvol);
95
96 return 0;
97 }
98