[LTP] [PATCH v2] syscalls/fanotify11: new test for report thread id
Amir Goldstein
amir73il@gmail.com
Thu Sep 27 13:57:46 CEST 2018
On Thu, Sep 27, 2018 at 1:58 PM nixiaoming <nixiaoming@huawei.com> wrote:
>
> syscalls/fanotify11
> test fanotify_init with FAN_EVENT_INFO_TID
> data->pid is ID(pid) of the thread that caused the event
> test fanotify_init without FAN_EVENT_INFO_TID
> data->pid is ID(tgid) of the process that caused the event
>
> Signed-off-by: nixiaoming <nixiaoming@huawei.com>
> ---
Here below the --- you can write your patch cover letter that son't be
in commit message.
When posting to the list you need to explicitly say that this in
not testing an upstream feature, only RFC.
Comments are welcome but test should NOT be merged at this point.
> runtest/syscalls | 1 +
> testcases/kernel/syscalls/fanotify/.gitignore | 1 +
> testcases/kernel/syscalls/fanotify/Makefile | 2 +-
> testcases/kernel/syscalls/fanotify/fanotify11.c | 221 ++++++++++++++++++++++++
> 4 files changed, 224 insertions(+), 1 deletion(-)
> create mode 100644 testcases/kernel/syscalls/fanotify/fanotify11.c
>
> diff --git a/runtest/syscalls b/runtest/syscalls
> index 0d0be77..84b0d6e 100644
> --- a/runtest/syscalls
> +++ b/runtest/syscalls
> @@ -497,6 +497,7 @@ fanotify06 fanotify06
> fanotify07 fanotify07
> fanotify08 fanotify08
> fanotify09 fanotify09
> +fanotify11 fanotify11
>
> ioperm01 ioperm01
> ioperm02 ioperm02
> diff --git a/testcases/kernel/syscalls/fanotify/.gitignore b/testcases/kernel/syscalls/fanotify/.gitignore
> index ec75539..62180ab 100644
> --- a/testcases/kernel/syscalls/fanotify/.gitignore
> +++ b/testcases/kernel/syscalls/fanotify/.gitignore
> @@ -7,3 +7,4 @@
> /fanotify07
> /fanotify08
> /fanotify09
> +/fanotify11
> diff --git a/testcases/kernel/syscalls/fanotify/Makefile b/testcases/kernel/syscalls/fanotify/Makefile
> index bb58878..5d01b48 100644
> --- a/testcases/kernel/syscalls/fanotify/Makefile
> +++ b/testcases/kernel/syscalls/fanotify/Makefile
> @@ -17,7 +17,7 @@
> #
>
> top_srcdir ?= ../../../..
> -
> +fanotify11: CFLAGS+=-pthread
> include $(top_srcdir)/include/mk/testcases.mk
>
> include $(top_srcdir)/include/mk/generic_leaf_target.mk
> diff --git a/testcases/kernel/syscalls/fanotify/fanotify11.c b/testcases/kernel/syscalls/fanotify/fanotify11.c
> new file mode 100644
> index 0000000..6218b22
> --- /dev/null
> +++ b/testcases/kernel/syscalls/fanotify/fanotify11.c
> @@ -0,0 +1,221 @@
> +/*
> + * Copyright (c) 2013 SUSE. All Rights Reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of version 2 of the GNU General Public License as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it would be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
> + *
> + * Further, this software is distributed without any warranty that it is
> + * free of the rightful claim of any third person regarding infringement
> + * or the like. Any license provided herein, whether implied or
> + * otherwise, applies only to this software file. Patent licenses, if
> + * any, provided herein do not apply to combinations of this program with
> + * other software, or any other product whatsoever.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, write the Free Software Foundation, Inc.,
> + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
> + *
> + * Started by nixiaoming <nixiaoming@huawei.com>
> + *
> + * DESCRIPTION
> + * After fanotify_init adds flags FAN_EVENT_INFO_TID,
> + * check whether the program can accurately identify which thread id
> + * in the multithreaded program triggered the event..
> + *
> + */
> +#define _GNU_SOURCE
> +#include "config.h"
> +
> +#include <stdio.h>
> +#include <stdlib.h>
> +
> +#include <sys/stat.h>
> +#include <sys/types.h>
> +#include <fcntl.h>
> +#include <errno.h>
> +#include <string.h>
> +#include <unistd.h>
> +#include <sys/syscall.h>
> +#include <pthread.h>
> +#include <sys/stat.h>
> +#include <fcntl.h>
> +#include <linux/limits.h>
> +#include "tst_test.h"
> +#include "fanotify.h"
> +
> +#if defined(HAVE_SYS_FANOTIFY_H)
> +#include <sys/fanotify.h>
> +#define FAN_EVENT_INFO_TID 0x02000000
> +#ifdef FAN_EVENT_INFO_TID
What is the purpose of this? define and then ifdef? leftover?
Please define this in fanotify.h inside ifndef
Please see my branch fanotify_unpriv as example.
You need only runtime check for kernel support.
> +
> +#define BUF_SIZE 256
> +#define gettid() syscall(SYS_gettid)
> +
> +static char fname[BUF_SIZE];
> +
> +static int tid;
> +static int tgid;
> +
> +void *thread_create_file(void *arg LTP_ATTRIBUTE_UNUSED)
> +{
> + int fd;
> + char tid_file[64] = {0};
> + char buf[64];
> +
> + tid = gettid();
> + snprintf(tid_file, sizeof(tid_file), "%s/test_tid_%d", fname, tid);
> + fd = SAFE_OPEN(tid_file, O_RDWR|O_CREAT, 0600);
> + tst_res(TINFO, "file=%s. fd=%d, tid=%i\n", tid_file, fd, tid);
> + SAFE_WRITE(1, fd, tid_file, sizeof(tid_file));
> + lseek(fd, 0, SEEK_SET);
> + SAFE_READ(0, fd, buf, sizeof(buf));
> + SAFE_CLOSE(fd);
> + SAFE_UNLINK(tid_file);
> + pthread_exit(0);
A good test is a simple test - this is way too much IMO.
You can replace everything with a single SAFE_FILE_PRINTF(tid_file, "1");
> +}
> +
> +static const char *mask2str(uint64_t mask)
> +{
> + static char buffer[10];
> + int offset = 0;
> +
> + if (mask & FAN_ACCESS)
> + buffer[offset++] = 'R';
> + if (mask & FAN_ONDIR)
> + buffer[offset++] = 'D';
> + if (mask & FAN_OPEN)
> + buffer[offset++] = 'O';
> + if (mask & FAN_CLOSE_WRITE || mask & FAN_CLOSE_NOWRITE)
> + buffer[offset++] = 'C';
> + if (mask & FAN_MODIFY || mask & FAN_CLOSE_WRITE)
> + buffer[offset++] = 'W';
> + buffer[offset] = '\0';
> +
> + return buffer;
> +}
> +
> +
> +static void show_data(const struct fanotify_event_metadata *data)
> +{
> + static char printbuf[100];
> + static char pathname[PATH_MAX];
> + struct stat st;
> + int len;
> +
> + snprintf(printbuf, sizeof(printbuf), "/proc/self/fd/%i", data->fd);
> + len = readlink(printbuf, pathname, sizeof(pathname));
> + if (len < 0) {
> + /* fall back to the device/inode */
> + if (fstat(data->fd, &st) < 0) {
> + perror("stat");
> + exit(1);
> + }
> + snprintf(pathname, sizeof(pathname), "device %i:%i inode %ld\n",
> + major(st.st_dev), minor(st.st_dev), st.st_ino);
> + } else {
> + pathname[len] = '\0';
> + }
> + tst_res(TINFO, "envnt: %i %s %s\n", data->pid, mask2str(data->mask),
> + pathname);
> +}
> +
> +void test_init_bit(unsigned int flags, unsigned long long mask)
> +{
> + int ret;
> + pthread_t p_id;
> + struct fanotify_event_metadata data;
> + int fd_notify;
> +
> + fd_notify = fanotify_init(flags, 0);
> + if (fd_notify == -EINVAL)
> + tst_brk(TCONF, "no support FAN_EVENT_INFO_TID\n");
Not like this, need tst_res(TCONF. See my fanotify_unpriv branch.
You should run your test on upsteam kernel and verify if results with
TCONF and with no errors.
> +
> + ret = fanotify_mark(fd_notify, FAN_MARK_ADD, mask | FAN_EVENT_ON_CHILD, AT_FDCWD, fname);
> + if (ret != 0) {
> + tst_brk(TBROK, "fanotify_mark (%d, FAN_MARK_ADD, %x, AT_FDCWD, %s) failed, ret=%d\n", mask | FAN_EVENT_ON_CHILD, fd_notify, fname, ret);
> + }
> + pthread_create(&p_id, NULL, thread_create_file, NULL);
> + res = SAFE_READ(0, fd_notify, &data, sizeof(struct fanotify_event_metadata));
> + show_data(&data);
> + if (((flags & FAN_EVENT_INFO_TID) && (data.pid == tid)) ||
> + ((!(flags & FAN_EVENT_INFO_TID)) && (data.pid == tgid)))
> + tst_res(TPASS, "%s FAN_EVENT_INFO_TID: tgid=%d, tid=%d, data->pid=%d\n", (flags & FAN_EVENT_INFO_TID) ? "with" : "without", tgid, tid, data.pid);
> + else
> + tst_res(TFAIL, "%s FAN_EVENT_INFO_TID: tgid=%d, tid=%d, data->pid=%d\n", (flags & FAN_EVENT_INFO_TID) ? "with" : "without", tgid, tid, data.pid);
> + if (data.fd != FAN_NOFD)
> + SAFE_CLOSE(data.fd);
> +
> + /* Remove mark to clear FAN_MARK_IGNORED_SURV_MODIFY */
> + ret = fanotify_mark(fd_notify, FAN_MARK_REMOVE, mask | FAN_EVENT_ON_CHILD, AT_FDCWD, fname);
> + if (ret != 0) {
> + tst_brk(TBROK, "fanotify_mark (%d, FAN_MARK_REMOVE, %x, AT_FDCWD, %s) failed, ret=%d\n", mask | FAN_EVENT_ON_CHILD, fd_notify, fname, ret);
> + }
No need for remove mark if you are closing fd_notify.
> +
> + SAFE_CLOSE(fd_notify);
> +
> +}
> +
> +static void run(unsigned int i)
> +{
> + switch (i) {
> + case 0:
> + test_init_bit(FAN_EVENT_INFO_TID, FAN_CLOSE);
> + break;
> + case 1:
> + test_init_bit(FAN_EVENT_INFO_TID, FAN_OPEN);
> + break;
> + case 2:
> + test_init_bit(FAN_EVENT_INFO_TID, FAN_MODIFY);
> + break;
> + case 3:
> + test_init_bit(FAN_EVENT_INFO_TID, FAN_ACCESS);
> + break;
> + case 4:
> + test_init_bit(0, FAN_CLOSE);
> + break;
> + case 5:
> + test_init_bit(0, FAN_OPEN);
> + break;
> + case 6:
> + test_init_bit(0, FAN_MODIFY);
> + break;
> + case 7:
> + test_init_bit(0, FAN_ACCESS);
> + break;
> + }
IMO the 8 cases are too much. 2 cases "with" and "without" are sufficient.
No need to test with different events IMO.
> +}
> +
> +static void setup(void)
> +{
> + tgid = getpid();
> + sprintf(fname, "tfile_%d", tgid);
> + mkdir(fname, 0755);
> +}
> +
> +static void cleanup(void)
> +{
> + rmdir(fname);
You don't need to - its in a temp dir cleaned up by library.
> +}
> +
> +static struct tst_test test = {
> + .test = run,
> + .tcnt = 8,
Please arrange your test cases in an array and use ARRAY_SIZE(tcases)
here. for all I care your array can be
static unsigned int tcases[] = {
FAN_CLASS_NOTIF,
FAN_CLASS_NOTIF|FAN_EVENT_INFO_TID,
};
And then you don't need the run() wrapper function at all.
Thanks,
Amir.
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