[LTP] [PATCH 0/2] Fix inotify{07,08} TBROK where it should TFAIL

[LTP] [PATCH 0/2] Fix inotify{07,08} TBROK where it should TFAIL

[Cyril Hrubis]

Fixes regression cause by deda021818a4 ('inotify: modernize with SAFE_ wrappers')

v2: Fix all the typos

Cyril Hrubis (2):
  safe_macros: Add SAFE_READ_ANY_EAGAIN
  syscalls/inotify{07,08}: Fix TBROK on older kernels

 include/safe_macros_fn.h                      | 16 ++++++++++++++--
 lib/safe_macros.c                             | 10 +++++++---
 testcases/kernel/syscalls/inotify/inotify07.c |  2 +-
 testcases/kernel/syscalls/inotify/inotify08.c |  2 +-
 4 files changed, 23 insertions(+), 7 deletions(-)

-- 
2.53.0


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[LTP] [PATCH v2 1/2] safe_macros: Add SAFE_READ_ANY_EAGAIN

[Cyril Hrubis]

Similarly to the safe_write() this turns the len_strict into three way
switch with the new value SAFE_READ_ANY_EAGAIN=2 that turns EAGAIN into
a read with a zero length.

Signed-off-by: Cyril Hrubis <chrubis@suse.cz>
---
 include/safe_macros_fn.h | 16 ++++++++++++++--
 lib/safe_macros.c        | 10 +++++++---
 2 files changed, 21 insertions(+), 5 deletions(-)

diff --git a/include/safe_macros_fn.h b/include/safe_macros_fn.h
index 9a09c4922..e8dc02539 100644
--- a/include/safe_macros_fn.h
+++ b/include/safe_macros_fn.h
@@ -36,6 +36,18 @@ enum safe_write_opts {
 	SAFE_WRITE_RETRY = 2,
 };
 
+/* supported values for safe_read() len_strict parameter */
+enum safe_read_opts {
+	/* no length strictness, short reads are ok */
+	SAFE_READ_ANY = 0,
+
+	/* strict length, short reads trigger TBROK */
+	SAFE_READ_ALL = 1,
+
+	/* converts EAGAIN to read that returns 0 */
+	SAFE_READ_ANY_EAGAIN = 2,
+};
+
 char* safe_basename(const char *file, const int lineno,
                     void (*cleanup_fn)(void), char *path);
 
@@ -80,8 +92,8 @@ int safe_pipe(const char *file, const int lineno,
               void (*cleanup_fn)(void), int fildes[2]);
 
 ssize_t safe_read(const char *file, const int lineno,
-                  void (*cleanup_fn)(void), char len_strict, int fildes,
-                  void *buf, size_t nbyte);
+                  void (*cleanup_fn)(void), enum safe_read_opts len_strict,
+                  int fildes, void *buf, size_t nbyte);
 
 int safe_setegid(const char *file, const int lineno,
                  void (*cleanup_fn)(void), gid_t egid);
diff --git a/lib/safe_macros.c b/lib/safe_macros.c
index 68b8747b4..f95c5fdc5 100644
--- a/lib/safe_macros.c
+++ b/lib/safe_macros.c
@@ -286,14 +286,18 @@ int safe_pipe(const char *file, const int lineno, void (*cleanup_fn) (void),
 	return rval;
 }
 
-ssize_t safe_read(const char *file, const int lineno, void (*cleanup_fn) (void),
-                  char len_strict, int fildes, void *buf, size_t nbyte)
+ssize_t safe_read(const char *file, const int lineno,
+                  void (*cleanup_fn) (void), enum safe_read_opts len_strict,
+                  int fildes, void *buf, size_t nbyte)
 {
 	ssize_t rval;
 
 	rval = read(fildes, buf, nbyte);
 
 	if (rval == -1) {
+		if (len_strict == SAFE_READ_ANY_EAGAIN && errno == EAGAIN)
+			return 0;
+
 		tst_brkm_(file, lineno, TBROK | TERRNO, cleanup_fn,
 			"read(%d,%p,%zu) failed, returned %zd", fildes, buf,
 			nbyte, rval);
@@ -301,7 +305,7 @@ ssize_t safe_read(const char *file, const int lineno, void (*cleanup_fn) (void),
 		tst_brkm_(file, lineno, TBROK | TERRNO, cleanup_fn,
 			"Invalid read(%d,%p,%zu) return value %zd", fildes,
 			buf, nbyte, rval);
-	} else if (len_strict && (size_t)rval != nbyte) {
+	} else if (len_strict == SAFE_READ_ALL && (size_t)rval != nbyte) {
 		tst_brkm_(file, lineno, TBROK, cleanup_fn,
 			  "Short read(%d,%p,%zu) returned only %zd",
 			  fildes, buf, nbyte, rval);
-- 
2.53.0


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[LTP] [PATCH v2 2/2] syscalls/inotify{07, 08}: Fix TBROK on older kernels

[Cyril Hrubis]

When kernel fails to generate events the read returns EAGAIN and since
we switched to SAFE_READ() the tests now TBROK when kernel does not
generate events. Fix this by passing the newly introduced
SAFE_READ_ANY_EAGAIN flag to the SAFE_READ().

Fixes: deda021818a4 ('inotify: modernize with SAFE_ wrappers')
Signed-off-by: Cyril Hrubis <chrubis@suse.cz>
---
 testcases/kernel/syscalls/inotify/inotify07.c | 2 +-
 testcases/kernel/syscalls/inotify/inotify08.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/testcases/kernel/syscalls/inotify/inotify07.c b/testcases/kernel/syscalls/inotify/inotify07.c
index b4000f353..9cadbf656 100644
--- a/testcases/kernel/syscalls/inotify/inotify07.c
+++ b/testcases/kernel/syscalls/inotify/inotify07.c
@@ -88,7 +88,7 @@ void verify_inotify(void)
 	strcpy(event_set[test_cnt].name, FILE_NAME);
 	test_cnt++;
 
-	int len = SAFE_READ(0, fd_notify, event_buf, EVENT_BUF_LEN);
+	int len = SAFE_READ(SAFE_READ_ANY_EAGAIN, fd_notify, event_buf, EVENT_BUF_LEN);
 
 	int i = 0, test_num = 0;
 	while (i < len) {
diff --git a/testcases/kernel/syscalls/inotify/inotify08.c b/testcases/kernel/syscalls/inotify/inotify08.c
index e0837cac3..23d3c5a65 100644
--- a/testcases/kernel/syscalls/inotify/inotify08.c
+++ b/testcases/kernel/syscalls/inotify/inotify08.c
@@ -86,7 +86,7 @@ void verify_inotify(void)
 	SAFE_TOUCH(OVL_LOWER"/"FILE_NAME, 0644, NULL);
 	SAFE_TOUCH(OVL_UPPER"/"FILE_NAME, 0644, NULL);
 
-	int len = SAFE_READ(0, fd_notify, event_buf, EVENT_BUF_LEN);
+	int len = SAFE_READ(SAFE_READ_ANY_EAGAIN, fd_notify, event_buf, EVENT_BUF_LEN);
 
 	int i = 0, test_num = 0;
 	while (i < len) {
-- 
2.53.0


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Re: [LTP] [PATCH v2 2/2] syscalls/inotify{07, 08}: Fix TBROK on older kernels

[Martin Doucha]

Hi,
for both patches:

Reviewed-by: Martin Doucha <mdoucha@suse.cz>

On 5/26/26 10:34, Cyril Hrubis wrote:
> When kernel fails to generate events the read returns EAGAIN and since
> we switched to SAFE_READ() the tests now TBROK when kernel does not
> generate events. Fix this by passing the newly introduced
> SAFE_READ_ANY_EAGAIN flag to the SAFE_READ().
> 
> Fixes: deda021818a4 ('inotify: modernize with SAFE_ wrappers')
> Signed-off-by: Cyril Hrubis <chrubis@suse.cz>
> ---
>   testcases/kernel/syscalls/inotify/inotify07.c | 2 +-
>   testcases/kernel/syscalls/inotify/inotify08.c | 2 +-
>   2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/testcases/kernel/syscalls/inotify/inotify07.c b/testcases/kernel/syscalls/inotify/inotify07.c
> index b4000f353..9cadbf656 100644
> --- a/testcases/kernel/syscalls/inotify/inotify07.c
> +++ b/testcases/kernel/syscalls/inotify/inotify07.c
> @@ -88,7 +88,7 @@ void verify_inotify(void)
>   	strcpy(event_set[test_cnt].name, FILE_NAME);
>   	test_cnt++;
>   
> -	int len = SAFE_READ(0, fd_notify, event_buf, EVENT_BUF_LEN);
> +	int len = SAFE_READ(SAFE_READ_ANY_EAGAIN, fd_notify, event_buf, EVENT_BUF_LEN);
>   
>   	int i = 0, test_num = 0;
>   	while (i < len) {
> diff --git a/testcases/kernel/syscalls/inotify/inotify08.c b/testcases/kernel/syscalls/inotify/inotify08.c
> index e0837cac3..23d3c5a65 100644
> --- a/testcases/kernel/syscalls/inotify/inotify08.c
> +++ b/testcases/kernel/syscalls/inotify/inotify08.c
> @@ -86,7 +86,7 @@ void verify_inotify(void)
>   	SAFE_TOUCH(OVL_LOWER"/"FILE_NAME, 0644, NULL);
>   	SAFE_TOUCH(OVL_UPPER"/"FILE_NAME, 0644, NULL);
>   
> -	int len = SAFE_READ(0, fd_notify, event_buf, EVENT_BUF_LEN);
> +	int len = SAFE_READ(SAFE_READ_ANY_EAGAIN, fd_notify, event_buf, EVENT_BUF_LEN);
>   
>   	int i = 0, test_num = 0;
>   	while (i < len) {


-- 
Martin Doucha   mdoucha@suse.cz
SW Quality Engineer
SUSE LINUX, s.r.o.
CORSO IIa
Krizikova 148/34
186 00 Prague 8
Czech Republic

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Re: [LTP] [PATCH v2 1/2] safe_macros: Add SAFE_READ_ANY_EAGAIN

[Avinesh Kumar via ltp]

Hi,

Reviewed-by: Avinesh Kumar <avinesh.kumar@suse.com>
for both patches.

Thanks,
Avinesh

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Re: [LTP] [PATCH v2 1/2] safe_macros: Add SAFE_READ_ANY_EAGAIN

[Petr Vorel]

Hi Cyril,

...
> +/* supported values for safe_read() len_strict parameter */
Could we have kerneldoc (ok to fix before merge).

/**
 * enum safe_read_opts - supported values for safe_read() len_strict parameter */
 *
 * @SAFE_READ_ANY: no length strictness, short reads are ok.
 * @SAFE_READ_ALL: strict length, short reads trigger :c:enum:`TBROK <tst_res_flags>`.
 * @SAFE_READ_ANY_EAGAIN: converts EAGAIN to read that returns 0.
 */

Otherwise LGTM, thanks for spotting the error.

Reviewed-by: Petr Vorel <pvorel@suse.cz>

Kind regards,
Petr

> +enum safe_read_opts {
> +	/* no length strictness, short reads are ok */
> +	SAFE_READ_ANY = 0,
> +
> +	/* strict length, short reads trigger TBROK */
> +	SAFE_READ_ALL = 1,
> +
> +	/* converts EAGAIN to read that returns 0 */
> +	SAFE_READ_ANY_EAGAIN = 2,
> +};
...

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Re: [LTP] [PATCH v2 2/2] syscalls/inotify{07, 08}: Fix TBROK on older kernels

[Petr Vorel]

Hi Cyril,

Reviewed-by: Petr Vorel <pvorel@suse.cz>
Thanks for fixing it!

> -	int len = SAFE_READ(0, fd_notify, event_buf, EVENT_BUF_LEN);
> +	int len = SAFE_READ(SAFE_READ_ANY_EAGAIN, fd_notify, event_buf, EVENT_BUF_LEN);

Maybe later after the release we could think about about shorten this with
definitions. I'm ok if you consider this as not useful.

Kind regards,
Petr

+++ include/tst_safe_macros.h
@@ -117,6 +117,15 @@ int safe_pipe2(const char *file, const int lineno, int fildes[2], int flags);
 #define SAFE_READ(len_strict, fildes, buf, nbyte) \
 	safe_read(__FILE__, __LINE__, NULL, (len_strict), (fildes), (buf), (nbyte))
 
+#define SAFE_READ_ANY(fildes, buf, nbyte) \
+	SAFE_READ(SAFE_READ_ANY, fildes, buf, nbyte)
+
+#define SAFE_READ_ALL(fildes, buf, nbyte) \
+	SAFE_READ(SAFE_READ_ALL, fildes, buf, nbyte)
+
+#define SAFE_READ_ANY_EAGAIN(fildes, buf, nbyte) \
+	SAFE_READ(SAFE_READ_ANY_EAGAIN, fildes, buf, nbyte)
+
 #define SAFE_SETEGID(egid) \
 	safe_setegid(__FILE__, __LINE__, NULL, (egid))
 

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Re: [LTP] [PATCH v2 2/2] syscalls/inotify{07, 08}: Fix TBROK on older kernels

[Cyril Hrubis]

Hi!
> Maybe later after the release we could think about about shorten this with
> definitions. I'm ok if you consider this as not useful.

I was thinking about this, but I wanted to have minimal fix before the
release. We can rethink the SAFE_WRITE and SAFE_READ API later on.

-- 
Cyril Hrubis
chrubis@suse.cz

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Re: [LTP] [PATCH v2 1/2] safe_macros: Add SAFE_READ_ANY_EAGAIN

[Cyril Hrubis]

Hi!
> ...
> > +/* supported values for safe_read() len_strict parameter */
> Could we have kerneldoc (ok to fix before merge).
> 
> /**
>  * enum safe_read_opts - supported values for safe_read() len_strict parameter */
>  *
>  * @SAFE_READ_ANY: no length strictness, short reads are ok.
>  * @SAFE_READ_ALL: strict length, short reads trigger :c:enum:`TBROK <tst_res_flags>`.
>  * @SAFE_READ_ANY_EAGAIN: converts EAGAIN to read that returns 0.
>  */
> 
> Otherwise LGTM, thanks for spotting the error.

I would avoid that for now, since we are likely going to change the API
after the release. Is that okay?

-- 
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chrubis@suse.cz

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Re: [LTP] [PATCH v2 1/2] safe_macros: Add SAFE_READ_ANY_EAGAIN

[Petr Vorel]

> Hi!
> > ...
> > > +/* supported values for safe_read() len_strict parameter */
> > Could we have kerneldoc (ok to fix before merge).

> > /**
> >  * enum safe_read_opts - supported values for safe_read() len_strict parameter */
> >  *
> >  * @SAFE_READ_ANY: no length strictness, short reads are ok.
> >  * @SAFE_READ_ALL: strict length, short reads trigger :c:enum:`TBROK <tst_res_flags>`.
> >  * @SAFE_READ_ANY_EAGAIN: converts EAGAIN to read that returns 0.
> >  */

> > Otherwise LGTM, thanks for spotting the error.

> I would avoid that for now, since we are likely going to change the API
> after the release. Is that okay?

Sure, I'm sorry I overlooked expected API change.

Kind regards,
Petr

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Re: [LTP] [PATCH v2 2/2] syscalls/inotify{07, 08}: Fix TBROK on older kernels

[Petr Vorel]

> Hi!
> > Maybe later after the release we could think about about shorten this with
> > definitions. I'm ok if you consider this as not useful.

> I was thinking about this, but I wanted to have minimal fix before the
> release. We can rethink the SAFE_WRITE and SAFE_READ API later on.

Good. Sure I agree with minimal changes as these are pre-release fixes.

Kind regards,
Petr

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Re: [LTP] [PATCH v2 2/2] syscalls/inotify{07, 08}: Fix TBROK on older kernels

[Cyril Hrubis]

Hi!
> Good. Sure I agree with minimal changes as these are pre-release fixes.

Pushed.

-- 
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chrubis@suse.cz

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