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/* SPDX-License-Identifier: MIT */
/*
* Description: test io_uring linkat handling
*/
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "liburing.h"
#include "helpers.h"
static int do_linkat(struct io_uring *ring, int olddirfd, const char *oldname,
const char *newname, int flags)
{
struct io_uring_sqe *sqe;
struct io_uring_cqe *cqe;
int ret;
sqe = io_uring_get_sqe(ring);
if (!sqe) {
fprintf(stderr, "sqe get failed\n");
return 1;
}
io_uring_prep_linkat(sqe, olddirfd, oldname, AT_FDCWD, newname, flags);
ret = io_uring_submit(ring);
if (ret != 1) {
fprintf(stderr, "submit failed: %d\n", ret);
return 1;
}
ret = io_uring_wait_cqes(ring, &cqe, 1, 0, 0);
if (ret) {
fprintf(stderr, "wait_cqe failed: %d\n", ret);
return 1;
}
ret = cqe->res;
io_uring_cqe_seen(ring, cqe);
return ret;
}
static int files_linked_ok(const char* fn1, const char *fn2)
{
struct stat s1, s2;
if (stat(fn1, &s1)) {
fprintf(stderr, "stat(%s): %s\n", fn1, strerror(errno));
return 0;
}
if (stat(fn2, &s2)) {
fprintf(stderr, "stat(%s): %s\n", fn2, strerror(errno));
return 0;
}
if (s1.st_dev != s2.st_dev || s1.st_ino != s2.st_ino) {
fprintf(stderr, "linked files have different device / inode numbers\n");
return 0;
}
if (s1.st_nlink != 2 || s2.st_nlink != 2) {
fprintf(stderr, "linked files have unexpected links count\n");
return 0;
}
return 1;
}
int main(int argc, char *argv[])
{
static const char target[] = "io_uring-linkat-test-target";
static const char emptyname[] = "io_uring-linkat-test-empty";
static const char linkname[] = "io_uring-linkat-test-link";
static const char symlinkname[] = "io_uring-linkat-test-symlink";
struct io_uring ring;
int ret, fd, exit_status = T_EXIT_FAIL;
if (argc > 1)
return T_EXIT_SKIP;
ret = io_uring_queue_init(8, &ring, 0);
if (ret) {
fprintf(stderr, "queue init failed: %d\n", ret);
return ret;
}
ret = fd = open(target, O_CREAT | O_RDWR | O_EXCL, 0600);
if (ret < 0) {
perror("open");
goto out;
}
if (write(fd, "linktest", 8) != 8) {
close(fd);
goto out;
}
if(geteuid()) {
fprintf(stdout, "not root, skipping AT_EMPTY_PATH test\n");
} else {
ret = do_linkat(&ring, fd, "", emptyname, AT_EMPTY_PATH);
if (ret < 0) {
if (ret == -EBADF || ret == -EINVAL) {
fprintf(stdout, "linkat not supported, skipping\n");
exit_status = T_EXIT_SKIP;
goto out;
}
fprintf(stderr, "linkat: %s\n", strerror(-ret));
goto out;
} else if (ret) {
goto out;
}
if (!files_linked_ok(emptyname, target))
goto out;
unlinkat(AT_FDCWD, emptyname, 0);
}
close(fd);
ret = symlink(target, symlinkname);
if (ret < 0) {
perror("open");
goto out;
}
ret = do_linkat(&ring, AT_FDCWD, target, linkname, 0);
if (ret < 0) {
if (ret == -EBADF || ret == -EINVAL) {
fprintf(stdout, "linkat not supported, skipping\n");
exit_status = T_EXIT_SKIP;
goto out;
}
fprintf(stderr, "linkat: %s\n", strerror(-ret));
goto out;
} else if (ret) {
goto out;
}
if (!files_linked_ok(linkname, target))
goto out;
unlinkat(AT_FDCWD, linkname, 0);
ret = do_linkat(&ring, AT_FDCWD, symlinkname, linkname, AT_SYMLINK_FOLLOW);
if (ret < 0) {
fprintf(stderr, "linkat: %s\n", strerror(-ret));
goto out;
} else if (ret) {
goto out;
}
if (!files_linked_ok(symlinkname, target))
goto out;
ret = do_linkat(&ring, AT_FDCWD, target, linkname, 0);
if (ret != -EEXIST) {
fprintf(stderr, "test_linkat linkname already exists failed: %d\n", ret);
goto out;
}
ret = do_linkat(&ring, AT_FDCWD, target, "surely/this/does/not/exist", 0);
if (ret != -ENOENT) {
fprintf(stderr, "test_linkat no parent failed: %d\n", ret);
goto out;
}
exit_status = T_EXIT_PASS;
out:
unlinkat(AT_FDCWD, symlinkname, 0);
unlinkat(AT_FDCWD, linkname, 0);
unlinkat(AT_FDCWD, emptyname, 0);
unlinkat(AT_FDCWD, target, 0);
io_uring_queue_exit(&ring);
return exit_status;
}
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