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// SPDX-License-Identifier: GPL-2.0
/*
* Test program which uses the raw ext4 resize_fs ioctl directly.
*/
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
typedef unsigned long long __u64;
#ifndef EXT4_IOC_RESIZE_FS
#define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
#endif
#define pr_error(fmt, ...) do { \
fprintf (stderr, "ext4_resize.c: " fmt, ##__VA_ARGS__); \
} while (0)
static void usage(void)
{
fprintf(stdout, "\nUsage: ext4_resize [mnt_path] [new_size(blocks)]\n");
}
int main(int argc, char **argv)
{
__u64 new_size;
int error, fd;
char *mnt_dir = NULL, *tmp = NULL;
if (argc != 3) {
error = EINVAL;
pr_error("insufficient arguments\n");
usage();
return error;
}
mnt_dir = argv[1];
errno = 0;
new_size = strtoull(argv[2], &tmp, 10);
if ((errno) || (*tmp != '\0')) {
error = errno;
pr_error("invalid new size\n");
return error;
}
fd = open(mnt_dir, O_RDONLY);
if (fd < 0) {
error = errno;
pr_error("open() failed with error: %s\n", strerror(error));
return error;
}
if(ioctl(fd, EXT4_IOC_RESIZE_FS, &new_size) < 0) {
error = errno;
pr_error("EXT4_IOC_RESIZE_FS ioctl() failed with error: %s\n", strerror(error));
return error;
}
return 0;
}
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