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/* vi: set sw=4 ts=4: */
/* Ported to busybox from mtd-utils.
*
* Licensed under GPLv2, see file LICENSE in this tarball for details.
*/
#include "libbb.h"
#include <mtd/mtd-user.h>
int flash_lock_unlock_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int flash_lock_unlock_main(int argc UNUSED_PARAM, char **argv)
{
/* note: fields in these structs are 32-bits.
* apparently we can't win anything by using off_t
* or long long's for offset and/or sectors vars. */
struct mtd_info_user info;
struct erase_info_user lock;
unsigned long offset;
long sectors;
int fd;
#define do_lock (ENABLE_FLASH_LOCK && (!ENABLE_FLASH_UNLOCK || (applet_name[6] == 'l')))
if (!argv[1])
bb_show_usage();
/* parse offset and number of sectors to lock */
offset = 0;
sectors = -1;
if (do_lock) {
if (!argv[2] || !argv[3])
bb_show_usage();
offset = xstrtoul(argv[2], 0);
sectors = xstrtol(argv[3], 0);
}
fd = xopen(argv[1], O_RDWR);
xioctl(fd, MEMGETINFO, &info);
lock.start = 0;
lock.length = info.size;
if (do_lock) {
unsigned long size = info.size - info.erasesize;
if (offset > size) {
bb_error_msg_and_die("%lx is beyond device size %lx\n",
offset, size);
}
if (sectors == -1) {
sectors = info.size / info.erasesize;
} else {
// isn't this useless?
unsigned long num = info.size / info.erasesize;
if (sectors > num) {
bb_error_msg_and_die("%ld are too many "
"sectors, device only has "
"%ld\n", sectors, num);
}
}
lock.start = offset;
lock.length = sectors * info.erasesize;
xioctl(fd, MEMLOCK, &lock);
} else {
xioctl(fd, MEMUNLOCK, &lock);
}
return EXIT_SUCCESS;
}
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