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#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <linux/btrfs.h>
#include <linux/btrfs_tree.h>
#include <string.h>
int main(int argc, char *argv[])
{
if (argc < 3) {
fprintf(stderr, "usage: %s <mount point> <tree ID> <inode number | --tree-id>\n", argv[0]);
exit(EXIT_FAILURE);
}
const char *const path = argv[1];
unsigned long long treeid = strtoull(argv[2], NULL, 10);
unsigned long long ino;
if (strcmp(argv[3], "--tree-id") == 0) {
ino = BTRFS_FIRST_FREE_OBJECTID;
if (treeid > 0) {
printf("warning: the given tree ID value will be discarded.\n");
}
treeid = 0;
} else {
ino = strtoull(argv[3], NULL, 10);
}
int fd = open(path, O_RDONLY | O_DIRECTORY);
if (fd < 0) {
perror("open");
return 1;
}
// Check the README.md file on the args.
struct btrfs_ioctl_ino_lookup_args args;
memset(&args, 0, sizeof(args));
args.treeid = treeid;
args.objectid = ino;
if (ioctl(fd, BTRFS_IOC_INO_LOOKUP, &args) < 0) {
perror("BTRFS_IOC_INO_LOOKUP");
close(fd);
exit(EXIT_FAILURE);
}
printf("tree ID: %llu\n", args.treeid);
printf("inode: %llu\n", ino);
printf("path: %s\n", args.name);
close(fd);
return 0;
}
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