Re: [LTP] [PATCH 1/2] syscalls/inotify: Test generation of overflow events

Re: [LTP] [PATCH 1/2] syscalls/inotify: Test generation of overflow events

[chrubis]

Hi!
> Test whether overflow event is properly generated when we don't read
> inotify descriptor and generate enough events.
> 
> Signed-off-by: Jan Kara <jack@suse.cz>

You are missing runtest files and it would be better to update
syscalls/.gitignore too.

I've wrote a short introduction on writing LTP testcases (it's not
finished yet but it contains quite a lot of good information). And there
is a contribution checklist at the bottom:

https://github.com/linux-test-project/ltp/wiki/Test-Writing-Guidelines

> ---
>  testcases/kernel/syscalls/inotify/inotify05.c | 224 ++++++++++++++++++++++++++
>  1 file changed, 224 insertions(+)
>  create mode 100644 testcases/kernel/syscalls/inotify/inotify05.c
> 
> diff --git a/testcases/kernel/syscalls/inotify/inotify05.c b/testcases/kernel/syscalls/inotify/inotify05.c
> new file mode 100644
> index 000000000000..82329aae3a88
> --- /dev/null
> +++ b/testcases/kernel/syscalls/inotify/inotify05.c
> @@ -0,0 +1,224 @@
> +/*
> + * Copyright (c) 2014 SUSE Linux.  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 Jan Kara <jack@suse.cz>
> + *
> + * DESCRIPTION
> + *     Check that inotify overflow event is properly generated
> + *
> + * ALGORITHM
> + *     Generate enough events without reading them and check that overflow
> + *     event is generated.
> + */
> +#include "config.h"
> +
> +#include <stdio.h>
> +#include <sys/stat.h>
> +#include <sys/types.h>
> +#include <sys/fcntl.h>
> +#include <errno.h>
> +#include <string.h>
> +#include <sys/syscall.h>
> +#include "test.h"
> +#include "usctest.h"
> +#include "linux_syscall_numbers.h"
> +#include "inotify.h"
> +#include "safe_macros.h"
> +
> +char *TCID = "inotify05";
> +int TST_TOTAL = 1;
> +
> +#if defined(HAVE_SYS_INOTIFY_H)
> +#include <sys/inotify.h>
> +
> +/* size of the event structure, not counting name */
> +#define EVENT_SIZE  (sizeof (struct inotify_event))
> +#define EVENT_BUF_LEN (EVENT_SIZE * 16)
> +
> +static void setup(void);
> +static void cleanup(void);
> +
> +#define BUF_SIZE 256
> +static char fname[BUF_SIZE];
> +static char buf[BUF_SIZE];
> +static int fd, fd_notify;
> +static int wd;
> +static int max_events;
> +
> +static char event_buf[EVENT_BUF_LEN];
> +
> +int main(int ac, char **av)
> +{
> +	int lc, i;
> +	char *msg;
> +	int len, stop;
> +
> +	if ((msg = parse_opts(ac, av, NULL, NULL)) != NULL)
> +		tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg);
> +
> +	setup();
> +
> +	for (lc = 0; TEST_LOOPING(lc); lc++) {
> +		/*
> +		 * generate events
> +		 */
> +		fd = SAFE_OPEN(cleanup, fname, O_RDWR);
> +
> +		for (i = 0; i < max_events; i++) {
> +			SAFE_LSEEK(cleanup, fd, 0, SEEK_SET);
> +			SAFE_READ(cleanup, 1, fd, buf, BUF_SIZE);
> +			SAFE_LSEEK(cleanup, fd, 0, SEEK_SET);
> +			SAFE_WRITE(cleanup, 1, fd, buf, BUF_SIZE);
> +		}
> +
> +		SAFE_CLOSE(cleanup, fd);
> +
> +		stop = 0;
> +		while (!stop) {
> +			/*
> +			 * get list on events
> +			 */
> +			len = read(fd_notify, event_buf, EVENT_BUF_LEN);
> +			if (len < 0) {
> +				tst_brkm(TBROK | TERRNO, cleanup,
> +					 "read(%d, buf, %zu) failed",
> +					 fd_notify, EVENT_BUF_LEN);
> +			}
> +
> +			/*
> +			 * check events
> +			 */
> +			i = 0;
> +			while (i < len) {
> +				struct inotify_event *event;
> +
> +				event = (struct inotify_event *)&event_buf[i];
> +				if (event->mask != IN_ACCESS &&
> +				    event->mask != IN_MODIFY &&
> +				    event->mask != IN_OPEN &&
> +				    event->mask != IN_Q_OVERFLOW) {
> +					tst_resm(TFAIL,
> +						 "get event: wd=%d mask=%x "
> +						 "cookie=%u (expected 0) len=%u",
> +						 event->wd, event->mask,
> +						 event->cookie, event->len);
> +					stop = 1;
> +					break;
> +				}
> +				if (event->mask == IN_Q_OVERFLOW) {
> +					if (event->len != 0 ||
> +					    event->cookie != 0 ||
> +					    event->wd != -1) {
> +						tst_resm(TFAIL,
> +						 	 "invalid overflow event: "

There is a space before the tab.

> +							 "wd=%d mask=%x "
> +							 "cookie=%u len=%u",
> +							 event->wd, event->mask,
> +							 event->cookie,
> +							 event->len);
> +						stop = 1;
> +						break;
> +					}
> +					if ((int)(i + EVENT_SIZE) != len) {
> +						tst_resm(TFAIL,
> +						 	 "overflow event is not last");

Here as well.

> +						stop = 1;
> +						break;
> +					}
> +					tst_resm(TPASS, "get event: wd=%d "
> +						 "mask=%x cookie=%u len=%u",
> +						 event->wd, event->mask,
> +						 event->cookie, event->len);
> +					stop = 1;
> +					break;
> +				}
> +				i += EVENT_SIZE + event->len;
> +			}
> +		}
> +	}
> +
> +	cleanup();
> +	tst_exit();
> +}
> +
> +static void setup(void)
> +{
> +	tst_sig(NOFORK, DEF_HANDLER, cleanup);
> +
> +	TEST_PAUSE;
> +
> +	tst_tmpdir();
> +
> +	sprintf(fname, "tfile_%d", getpid());
> +	fd = SAFE_OPEN(cleanup, fname, O_RDWR | O_CREAT, 0700);
> +	SAFE_WRITE(cleanup, 1, fd, buf, BUF_SIZE);
> +	SAFE_CLOSE(cleanup, fd);

I've created SAFE_FILE_PRINT() and SAFE_FILE_SCANF() to simplify reading
and writing files with printf and scanf like interface. See
include/safe_file_ops.h

> +	if ((fd_notify = syscall(__NR_inotify_init1, O_NONBLOCK)) < 0) {
> +		if (errno == ENOSYS) {
> +			tst_brkm(TCONF, cleanup,
> +				 "inotify is not configured in this kernel.");
> +		} else {
> +			tst_brkm(TBROK | TERRNO, cleanup,
> +				 "inotify_init failed");
> +		}
> +	}
> +
> +	if ((wd = myinotify_add_watch(fd_notify, fname, IN_ALL_EVENTS)) < 0) {
> +		tst_brkm(TBROK | TERRNO, cleanup,
> +			 "inotify_add_watch (%d, %s, IN_ALL_EVENTS) failed",
> +			 fd_notify, fname);
> +	};
> +
> +	fd = SAFE_OPEN(cleanup, "/proc/sys/fs/inotify/max_queued_events", O_RDONLY);
> +	SAFE_READ(cleanup, 0, fd, buf, BUF_SIZE);
> +	if (sscanf(buf, "%d", &max_events) != 1) {
> +		tst_brkm(TBROK, cleanup,
> +			 "cannot parse max_queued_events file");
> +	}
> +	SAFE_CLOSE(cleanup, fd);

SAFE_FILE_SCANF() ;)

> +}
> +
> +static void cleanup(void)
> +{
> +	if (myinotify_rm_watch(fd_notify, wd) < 0) {
> +		tst_resm(TWARN | TERRNO, "inotify_rm_watch (%d, %d) failed",
> +			 fd_notify, wd);
> +
> +	}
> +
> +	if (close(fd_notify) == -1) {
> +		tst_resm(TWARN, "close(%d) failed", fd_notify);
> +	}
> +
> +	TEST_CLEANUP;
> +	tst_rmdir();
> +}
> +
> +#else
> +
> +int main(void)
> +{
> +	tst_brkm(TCONF, NULL, "system doesn't have required inotify support");
> +}
> +
> +#endif

-- 
Cyril Hrubis
chrubis@suse.cz

------------------------------------------------------------------------------
Flow-based real-time traffic analytics software. Cisco certified tool.
Monitor traffic, SLAs, QoS, Medianet, WAAS etc. with NetFlow Analyzer
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Re: [LTP] [PATCH 2/2] syscalls/fanotify: Test generation of overflow events

[chrubis]

Hi!
> Test whether overflow event is properly generated when we don't read
> fanotify descriptor and generate enough events.

Missing runtest and .gitignore changes as well.

>  testcases/kernel/syscalls/fanotify/fanotify05.c | 185 ++++++++++++++++++++++++
>  1 file changed, 185 insertions(+)
>  create mode 100644 testcases/kernel/syscalls/fanotify/fanotify05.c
> 
> diff --git a/testcases/kernel/syscalls/fanotify/fanotify05.c b/testcases/kernel/syscalls/fanotify/fanotify05.c
> new file mode 100644
> index 000000000000..a714d9e27a6f
> --- /dev/null
> +++ b/testcases/kernel/syscalls/fanotify/fanotify05.c
> @@ -0,0 +1,185 @@
> +/*
> + * Copyright (c) 2014 SUSE Linux.  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 Jan Kara <jack@suse.cz>
> + *
> + * DESCRIPTION
> + *     Check that fanotify overflow event is properly generated
> + *
> + * ALGORITHM
> + *     Generate enough events without reading them and check that overflow
> + *     event is generated.
> + */
> +#include "config.h"
> +
> +#include <stdio.h>
> +#include <sys/stat.h>
> +#include <sys/types.h>
> +#include <sys/fcntl.h>
> +#include <errno.h>
> +#include <string.h>
> +#include <sys/syscall.h>
> +#include "test.h"
> +#include "usctest.h"
> +#include "linux_syscall_numbers.h"
> +#include "fanotify.h"
> +#include "safe_macros.h"
> +
> +char *TCID = "fanotify05";
> +int TST_TOTAL = 1;
> +
> +#if defined(HAVE_SYS_FANOTIFY_H)
> +#include <sys/fanotify.h>
> +
> +/* Currently this is fixed in kernel... */
> +#define MAX_EVENTS 16384
> +
> +static void setup(void);
> +static void cleanup(void);
> +
> +#define BUF_SIZE 256
> +static char fname[BUF_SIZE];
> +static int fd, fd_notify;
> +
> +struct fanotify_event_metadata event;
> +
> +int main(int ac, char **av)
> +{
> +	int lc, i;
> +	char *msg;
> +	int len;
> +
> +	if ((msg = parse_opts(ac, av, NULL, NULL)) != NULL)
> +		tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg);
> +
> +	setup();
> +
> +	for (lc = 0; TEST_LOOPING(lc); lc++) {
> +		/*
> +		 * generate events
> +		 */
> +		for (i = 0; i < MAX_EVENTS + 1; i++) {
> +			sprintf(fname, "fname_%d", i);
> +			fd = SAFE_OPEN(cleanup, fname, O_RDWR | O_CREAT, 0644);
> +			SAFE_CLOSE(cleanup, fd);

SAFE_FILE_TOUCH(cleanup, fname, 0, NULL)

> +		}
> +
> +		while (1) {
> +			/*
> +			 * get list on events
> +			 */
> +			len = read(fd_notify, &event, sizeof(event));
> +			if (len < 0) {
> +				if (errno == -EAGAIN) {
> +					tst_resm(TFAIL, "Overflow event not "
> +						 "generated!\n");
> +					break;
> +				}
> +				tst_brkm(TBROK | TERRNO, cleanup,
> +				 	 "read of notification event failed");

Space befor tab.

> +				break;
> +			}
> +			if (event.fd != FAN_NOFD)
> +				close(event.fd);
> +
> +			/*
> +			 * check events
> +			 */
> +			if (event.mask != FAN_OPEN &&
> +			    event.mask != FAN_Q_OVERFLOW) {
> +				tst_resm(TFAIL,
> +					 "get event: mask=%llx (expected %llx)"
> +					 "pid=%u fd=%d",
> +					 (unsigned long long)event.mask,
> +					 (unsigned long long)FAN_OPEN,
> +					 (unsigned)event.pid, event.fd);
> +				break;
> +			}
> +			if (event.mask == FAN_Q_OVERFLOW) {
> +				if (event.fd != FAN_NOFD) {
> +					tst_resm(TFAIL,
> +					 	 "invalid overflow event: "

Here as well.

> +						 "mask=%llx pid=%u fd=%d",
> +						 (unsigned long long)event.mask,
> +						 (unsigned)event.pid,
> +						 event.fd);
> +					break;
> +				}
> +				tst_resm(TPASS,
> +					 "get event: mask=%llx pid=%u fd=%d",
> +					 (unsigned long long)event.mask,
> +					 (unsigned)event.pid, event.fd);
> +					break;
> +			}
> +		}
> +	}
> +
> +	cleanup();
> +	tst_exit();
> +}
> +
> +static void setup(void)
> +{
> +	tst_sig(NOFORK, DEF_HANDLER, cleanup);
> +
> +	TEST_PAUSE;
> +
> +	tst_tmpdir();
> +
> +	if ((fd_notify = myfanotify_init(FAN_CLASS_NOTIF | FAN_NONBLOCK,
> +					 O_RDONLY)) < 0) {

I would move the assigment out of the if conditional here and then do
just if (fd_notify < 0) but that is just aesthetic change.

> +		if (errno == ENOSYS) {
> +			tst_brkm(TCONF, cleanup,
> +				 "fanotify is not configured in this kernel.");
> +		} else {
> +			tst_brkm(TBROK | TERRNO, cleanup,
> +				 "fanotify_init failed");
> +		}
> +	}
> +
> +	if (myfanotify_mark(fd_notify, FAN_MARK_MOUNT | FAN_MARK_ADD, FAN_OPEN,
> +			    AT_FDCWD, ".") < 0) {
> +		tst_brkm(TBROK | TERRNO, cleanup,
> +			 "fanotify_mark (%d, FAN_MARK_MOUNT | FAN_MARK_ADD, "
> +			 "FAN_OPEN, AT_FDCWD, \".\") failed",
> +			 fd_notify);
> +	}
> +}
> +
> +static void cleanup(void)
> +{
> +	if (close(fd_notify) == -1) {
> +		tst_resm(TWARN, "close(%d) failed", fd_notify);
> +	}

And I tend not to add curly brackets around one line statements...

> +	TEST_CLEANUP;
> +	tst_rmdir();
> +}
> +
> +#else
> +
> +int main(void)
> +{
> +	tst_brkm(TCONF, NULL, "system doesn't have required fanotify support");
> +}
> +
> +#endif
> -- 
> 1.8.1.4
> 

-- 
Cyril Hrubis
chrubis@suse.cz

------------------------------------------------------------------------------
Flow-based real-time traffic analytics software. Cisco certified tool.
Monitor traffic, SLAs, QoS, Medianet, WAAS etc. with NetFlow Analyzer
Customize your own dashboards, set traffic alerts and generate reports.
Network behavioral analysis & security monitoring. All-in-one tool.
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_______________________________________________
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Re: [LTP] [PATCH 2/2] syscalls/fanotify: Test generation of overflow events

[chrubis]

Hi!
> > > Test whether overflow event is properly generated when we don't read
> > > fanotify descriptor and generate enough events.
> > 
> > Missing runtest and .gitignore changes as well.
>   Fixed in v2.
> 
> > > +		for (i = 0; i < MAX_EVENTS + 1; i++) {
> > > +			sprintf(fname, "fname_%d", i);
> > > +			fd = SAFE_OPEN(cleanup, fname, O_RDWR | O_CREAT, 0644);
> > > +			SAFE_CLOSE(cleanup, fd);
> > 
> > SAFE_FILE_TOUCH(cleanup, fname, 0, NULL)
>   I was considering this but since I really want syscall to be open() I
> thought using SAFE_OPEN directly is more future-proof in case someone would
> like to do some tricks with SAFE_FILE_TOUCH(). And we won't really save
> much with using SAFE_FILE_TOUCH()...

Ah, this loop generates the events, so it's better to have it exactly
under control. Ok.

-- 
Cyril Hrubis
chrubis@suse.cz

------------------------------------------------------------------------------
Flow-based real-time traffic analytics software. Cisco certified tool.
Monitor traffic, SLAs, QoS, Medianet, WAAS etc. with NetFlow Analyzer
Customize your own dashboards, set traffic alerts and generate reports.
Network behavioral analysis & security monitoring. All-in-one tool.
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Re: [LTP] [PATCH 1/2] syscalls/inotify: Test generation of overflow events

[chrubis]

Hi!
> +static void setup(void)
> +{
> +	tst_sig(NOFORK, DEF_HANDLER, cleanup);
> +
> +	TEST_PAUSE;
> +
> +	tst_tmpdir();
> +
> +	sprintf(fname, "tfile_%d", getpid());
> +	fd = SAFE_OPEN(cleanup, fname, O_RDWR | O_CREAT, 0700);
> +	SAFE_WRITE(cleanup, 1, fd, buf, BUF_SIZE);
> +	SAFE_CLOSE(cleanup, fd);
> +
> +	if ((fd_notify = syscall(__NR_inotify_init1, O_NONBLOCK)) < 0) {
> +		if (errno == ENOSYS) {
> +			tst_brkm(TCONF, cleanup,
> +				 "inotify is not configured in this kernel.");
> +		} else {
> +			tst_brkm(TBROK | TERRNO, cleanup,
> +				 "inotify_init failed");
> +		}
> +	}
> +
> +	if ((wd = myinotify_add_watch(fd_notify, fname, IN_ALL_EVENTS)) < 0) {
> +		tst_brkm(TBROK | TERRNO, cleanup,
> +			 "inotify_add_watch (%d, %s, IN_ALL_EVENTS) failed",
> +			 fd_notify, fname);
> +	};
> +
> +	fd = SAFE_OPEN(cleanup, "/proc/sys/fs/inotify/max_queued_events", O_RDONLY);
> +	SAFE_READ(cleanup, 0, fd, buf, BUF_SIZE);
> +	if (sscanf(buf, "%d", &max_events) != 1) {
> +		tst_brkm(TBROK, cleanup,
> +			 "cannot parse max_queued_events file");
> +	}
> +	SAFE_CLOSE(cleanup, fd);
> +}
> +
> +static void cleanup(void)
> +{
> +	if (myinotify_rm_watch(fd_notify, wd) < 0) {
> +		tst_resm(TWARN | TERRNO, "inotify_rm_watch (%d, %d) failed",
> +			 fd_notify, wd);
> +
> +	}
> +
> +	if (close(fd_notify) == -1) {
> +		tst_resm(TWARN, "close(%d) failed", fd_notify);
> +	}


And I guess that we need to change this to:

	if (fd_notify > 0 && close(fd_notify) == -1)


because the fd_notify may be set to -1 in case that the syscall above
failed with ENOSYS which would generate a bogus warning. And I guess
that the same goes for the removing the inotify watch.

> +	TEST_CLEANUP;
> +	tst_rmdir();
> +}
> +
> +#else
> +
> +int main(void)
> +{
> +	tst_brkm(TCONF, NULL, "system doesn't have required inotify support");
> +}
> +
> +#endif
> -- 
> 1.8.1.4
> 

-- 
Cyril Hrubis
chrubis@suse.cz

------------------------------------------------------------------------------
Flow-based real-time traffic analytics software. Cisco certified tool.
Monitor traffic, SLAs, QoS, Medianet, WAAS etc. with NetFlow Analyzer
Customize your own dashboards, set traffic alerts and generate reports.
Network behavioral analysis & security monitoring. All-in-one tool.
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Re: [LTP] [PATCH 1/2] syscalls/inotify: Test generation of overflow events

[chrubis]

Hi!
> > > +	SAFE_READ(cleanup, 0, fd, buf, BUF_SIZE);
> > > +	if (sscanf(buf, "%d", &max_events) != 1) {
> > > +		tst_brkm(TBROK, cleanup,
> > > +			 "cannot parse max_queued_events file");
> > > +	}
> > > +	SAFE_CLOSE(cleanup, fd);
> > > +}
> > > +
> > > +static void cleanup(void)
> > > +{
> > > +	if (myinotify_rm_watch(fd_notify, wd) < 0) {
> > > +		tst_resm(TWARN | TERRNO, "inotify_rm_watch (%d, %d) failed",
> > > +			 fd_notify, wd);
> > > +
> > > +	}
> > > +
> > > +	if (close(fd_notify) == -1) {
> > > +		tst_resm(TWARN, "close(%d) failed", fd_notify);
> > > +	}
> > 
> > 
> > And I guess that we need to change this to:
> > 
> > 	if (fd_notify > 0 && close(fd_notify) == -1)
> > 
> > 
> > because the fd_notify may be set to -1 in case that the syscall above
> > failed with ENOSYS which would generate a bogus warning. And I guess
> > that the same goes for the removing the inotify watch.
>   Well, yes. I can make that less verbose in case of missing inotify
> support. I was just following what is done in other inotify tests...

The problem is that TWARN gets propagated into the overall test result
so the test will not endup with clean TCONF in this case.

And unfortunately quite a lot of test cleanups are coded incorrectly in
LTP. :(


-- 
Cyril Hrubis
chrubis@suse.cz

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