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selftests: add OFD lock tests

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Test the basic locking stuff on 2 fds: multiple read locks,
conflicts between read and write locks, use of len==0 for queries.
Also tests for F_UNLCK F_OFD_GETLK extension.

[ jlayton: fix unlink() pathname in selftest ]

Cc: Jeff Layton <jlayton@kernel.org>
Cc: Chuck Lever <chuck.lever@oracle.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Christian Brauner <brauner@kernel.org>
Cc: linux-fsdevel@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: Shuah Khan <shuah@kernel.org>
Cc: linux-kselftest@vger.kernel.org
Cc: linux-api@vger.kernel.org
Signed-off-by: Stas Sergeev <stsp2@yandex.ru>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
This commit is contained in:
Stas Sergeev 2023-06-22 21:52:24 +05:00 committed by Jeff Layton
parent 6c9007f65d
commit bfe2e8f569
2 changed files with 137 additions and 0 deletions
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5
tools/testing/selftests/filelock/Makefile Normal file
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# SPDX-License-Identifier: GPL-2.0
TEST_GEN_PROGS := ofdlocks
include ../lib.mk

132
tools/testing/selftests/filelock/ofdlocks.c Normal file
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// SPDX-License-Identifier: GPL-2.0
#define _GNU_SOURCE
#include <fcntl.h>
#include <assert.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include "../kselftest.h"
static int lock_set(int fd, struct flock *fl)
{
int ret;
fl->l_pid = 0; // needed for OFD locks
fl->l_whence = SEEK_SET;
ret = fcntl(fd, F_OFD_SETLK, fl);
if (ret)
perror("fcntl()");
return ret;
}
static int lock_get(int fd, struct flock *fl)
{
int ret;
fl->l_pid = 0; // needed for OFD locks
fl->l_whence = SEEK_SET;
ret = fcntl(fd, F_OFD_GETLK, fl);
if (ret)
perror("fcntl()");
return ret;
}
int main(void)
{
int rc;
struct flock fl, fl2;
int fd = open("/tmp/aa", O_RDWR | O_CREAT | O_EXCL, 0600);
int fd2 = open("/tmp/aa", O_RDONLY);
unlink("/tmp/aa");
assert(fd != -1);
assert(fd2 != -1);
ksft_print_msg("[INFO] opened fds %i %i\n", fd, fd2);
/* Set some read lock */
fl.l_type = F_RDLCK;
fl.l_start = 5;
fl.l_len = 3;
rc = lock_set(fd, &fl);
if (rc == 0) {
ksft_print_msg
("[SUCCESS] set OFD read lock on first fd\n");
} else {
ksft_print_msg("[FAIL] to set OFD read lock on first fd\n");
return -1;
}
/* Make sure read locks do not conflict on different fds. */
fl.l_type = F_RDLCK;
fl.l_start = 5;
fl.l_len = 1;
rc = lock_get(fd2, &fl);
if (rc != 0)
return -1;
if (fl.l_type != F_UNLCK) {
ksft_print_msg("[FAIL] read locks conflicted\n");
return -1;
}
/* Make sure read/write locks do conflict on different fds. */
fl.l_type = F_WRLCK;
fl.l_start = 5;
fl.l_len = 1;
rc = lock_get(fd2, &fl);
if (rc != 0)
return -1;
if (fl.l_type != F_UNLCK) {
ksft_print_msg
("[SUCCESS] read and write locks conflicted\n");
} else {
ksft_print_msg
("[SUCCESS] read and write locks not conflicted\n");
return -1;
}
/* Get info about the lock on first fd. */
fl.l_type = F_UNLCK;
fl.l_start = 5;
fl.l_len = 1;
rc = lock_get(fd, &fl);
if (rc != 0) {
ksft_print_msg
("[FAIL] F_OFD_GETLK with F_UNLCK not supported\n");
return -1;
}
if (fl.l_type != F_UNLCK) {
ksft_print_msg
("[SUCCESS] F_UNLCK test returns: locked, type %i pid %i len %zi\n",
fl.l_type, fl.l_pid, fl.l_len);
} else {
ksft_print_msg
("[FAIL] F_OFD_GETLK with F_UNLCK did not return lock info\n");
return -1;
}
/* Try the same but by locking everything by len==0. */
fl2.l_type = F_UNLCK;
fl2.l_start = 0;
fl2.l_len = 0;
rc = lock_get(fd, &fl2);
if (rc != 0) {
ksft_print_msg
("[FAIL] F_OFD_GETLK with F_UNLCK not supported\n");
return -1;
}
if (memcmp(&fl, &fl2, sizeof(fl))) {
ksft_print_msg
("[FAIL] F_UNLCK test returns: locked, type %i pid %i len %zi\n",
fl.l_type, fl.l_pid, fl.l_len);
return -1;
}
ksft_print_msg("[SUCCESS] F_UNLCK with len==0 returned the same\n");
/* Get info about the lock on second fd - no locks on it. */
fl.l_type = F_UNLCK;
fl.l_start = 0;
fl.l_len = 0;
lock_get(fd2, &fl);
if (fl.l_type != F_UNLCK) {
ksft_print_msg
("[FAIL] F_OFD_GETLK with F_UNLCK return lock info from another fd\n");
return -1;
}
return 0;
}