[3320] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /* Ported to busybox from mtd-utils.
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| 3 | *
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| 4 | * Licensed under GPLv2, see file LICENSE in this source tree.
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| 5 | */
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| 6 | #include "libbb.h"
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| 7 | #include <mtd/mtd-user.h>
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| 8 |
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| 9 | int flash_lock_unlock_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 10 | int flash_lock_unlock_main(int argc UNUSED_PARAM, char **argv)
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| 11 | {
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| 12 | /* note: fields in these structs are 32-bits.
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| 13 | * apparently we can't win anything by using off_t
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| 14 | * or long long's for offset and/or sectors vars. */
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| 15 | struct mtd_info_user info;
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| 16 | struct erase_info_user lock;
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| 17 | unsigned long offset;
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| 18 | long sectors;
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| 19 | int fd;
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| 20 |
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| 21 | #define do_lock (ENABLE_FLASH_LOCK && (!ENABLE_FLASH_UNLOCK || (applet_name[6] == 'l')))
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| 22 |
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| 23 | if (!argv[1])
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| 24 | bb_show_usage();
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| 25 |
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| 26 | /* parse offset and number of sectors to lock */
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| 27 | offset = 0;
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| 28 | sectors = -1;
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| 29 | if (do_lock) {
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| 30 | if (!argv[2] || !argv[3])
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| 31 | bb_show_usage();
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| 32 | offset = xstrtoul(argv[2], 0);
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| 33 | sectors = xstrtol(argv[3], 0);
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| 34 | }
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| 35 |
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| 36 | fd = xopen(argv[1], O_RDWR);
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| 37 |
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| 38 | xioctl(fd, MEMGETINFO, &info);
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| 39 |
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| 40 | lock.start = 0;
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| 41 | lock.length = info.size;
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| 42 | if (do_lock) {
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| 43 | unsigned long size = info.size - info.erasesize;
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| 44 | if (offset > size) {
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| 45 | bb_error_msg_and_die("%lx is beyond device size %lx\n",
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| 46 | offset, size);
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| 47 | }
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| 48 |
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| 49 | if (sectors == -1) {
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| 50 | sectors = info.size / info.erasesize;
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| 51 | } else {
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| 52 | // isn't this useless?
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| 53 | unsigned long num = info.size / info.erasesize;
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| 54 | if (sectors > num) {
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| 55 | bb_error_msg_and_die("%ld are too many "
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| 56 | "sectors, device only has "
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| 57 | "%ld\n", sectors, num);
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| 58 | }
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| 59 | }
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| 60 |
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| 61 | lock.start = offset;
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| 62 | lock.length = sectors * info.erasesize;
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| 63 | xioctl(fd, MEMLOCK, &lock);
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| 64 | } else {
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| 65 | xioctl(fd, MEMUNLOCK, &lock);
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| 66 | }
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| 67 |
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| 68 | return EXIT_SUCCESS;
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| 69 | }
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