Linux-Trace-Devel Archive on lore.kernel.org
 help / color / Atom feed
From: Steven Rostedt <rostedt@goodmis.org>
To: linux-trace-devel@vger.kernel.org
Cc: Sameeruddin shaik <sameeruddin.shaik8@gmail.com>
Subject: [PATCH 04/13 v2] libtracefs: Move opening of file out of controlled_write()
Date: Mon, 29 Mar 2021 20:51:27 -0400
Message-ID: <20210330005247.820340155@goodmis.org> (raw)
In-Reply-To: <20210330005123.151740983@goodmis.org>

From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>

In order to try multiple methods of writing to the filter file, the opening
of the filter file needs to be in the tracefs_function_filter() call, and
allow that to be passed to multiple ways of writing to the filter.

Link: https://lore.kernel.org/linux-trace-devel/20210323013224.877520803@goodmis.org

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 src/tracefs-tools.c | 24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)

diff --git a/src/tracefs-tools.c b/src/tracefs-tools.c
index 4f8bcdc299df..02e43168a810 100644
--- a/src/tracefs-tools.c
+++ b/src/tracefs-tools.c
@@ -389,24 +389,18 @@ void tracefs_option_clear(struct tracefs_options_mask *options, enum tracefs_opt
 		options->mask &= ~(1ULL << (id - 1));
 }
 
-static int controlled_write(const char *filter_path, const char **filters,
-			    const char *module, bool reset, const char ***errs)
+static int controlled_write(int fd, const char **filters,
+			    const char *module, const char ***errs)
 {
-	int flags = reset ? O_TRUNC : O_APPEND;
 	const char **temp = NULL;
 	const char **e = NULL;
 	char *each_str = NULL;
 	int write_size = 0;
 	int size = 0;
-	int fd = -1;
 	int ret = 0;
 	int j = 0;
 	int i;
 
-	fd = open(filter_path, O_WRONLY | flags);
-	if (fd < 0)
-		return 1;
-
 	for (i = 0; filters[i]; i++) {
 		if (module)
 			write_size = asprintf(&each_str, "%s:mod:%s ", filters[i], module);
@@ -449,7 +443,6 @@ static int controlled_write(const char *filter_path, const char **filters,
  error:
 	if (each_str)
 		free(each_str);
-	close(fd);
 	return ret;
 }
 
@@ -486,6 +479,8 @@ int tracefs_function_filter(struct tracefs_instance *instance, const char **filt
 {
 	char *ftrace_filter_path;
 	int ret = 0;
+	int flags;
+	int fd;
 
 	if (!filters)
 		return 1;
@@ -494,7 +489,16 @@ int tracefs_function_filter(struct tracefs_instance *instance, const char **filt
 	if (!ftrace_filter_path)
 		return 1;
 
-	ret = controlled_write(ftrace_filter_path, filters, module, reset, errs);
+	flags = reset ? O_TRUNC : O_APPEND;
+
+	fd = open(ftrace_filter_path, O_WRONLY | flags);
 	tracefs_put_tracing_file(ftrace_filter_path);
+	if (fd < 0)
+		return 1;
+
+	ret = controlled_write(fd, filters, module, errs);
+
+	close(fd);
+
 	return ret;
 }
-- 
2.30.1



  parent reply index

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-30  0:51 [PATCH 00/13 v2] libtracefs: Add tracefs_function_filter() Steven Rostedt
2021-03-30  0:51 ` [PATCH 01/13 v2] libtracefs: An API to set the filtering of functions Steven Rostedt
2021-03-30  0:51 ` [PATCH 02/13 v2] libtracefs: Document function_filter API Steven Rostedt
2021-03-30  0:51 ` [PATCH 03/13 v2] libtracefs: Fix notations of tracefs_function_filter() and module parameter Steven Rostedt
2021-03-30  0:51 ` Steven Rostedt [this message]
2021-03-30  0:51 ` [PATCH 05/13 v2] libtracefs: Add add_errors() helper function for control_write() Steven Rostedt
2021-03-30  0:51 ` [PATCH 06/13 v2] libtracefs: Add checking of available_filter_functions to tracefs_function_filter() Steven Rostedt
2021-03-30  0:51 ` [PATCH 07/13 v2] libtracefs: Add write_filter() helper function Steven Rostedt
2021-03-30  0:51 ` [PATCH 08/13 v2] libtracefs: Allow for setting filters with regex expressions Steven Rostedt
2021-04-01 16:33   ` sameeruddin shaik
2021-03-31 16:39     ` Steven Rostedt
2021-04-02  1:59       ` sameeruddin shaik
2021-04-01  2:41         ` Steven Rostedt
2021-03-30  0:51 ` [PATCH 09/13 v2] libtracefs: Add indexing to set functions in tracefs_function_filter() Steven Rostedt
2021-03-30  0:51 ` [PATCH 10/13 v2] libtracefs: Pass in reset via flags to tracefs_function_filter() Steven Rostedt
2021-03-30 14:29   ` Tzvetomir Stoyanov
2021-03-30 14:53     ` Steven Rostedt
2021-03-30  0:51 ` [PATCH 11/13 v2] libtracefs: Add pthread_mutex_lock() around tracefs_function_filter() Steven Rostedt
2021-03-30  0:51 ` [PATCH 12/13 v2] libtracefs: Move struct tracefs_instance to tracefs-local.h Steven Rostedt
2021-03-30  0:51 ` [PATCH 13/13 v2] libtracefs: Add CONTINUE to tracefs_function_filter() Steven Rostedt
2021-03-30 14:29   ` Tzvetomir Stoyanov
2021-03-30 14:52     ` Steven Rostedt
2021-03-30 15:14       ` Steven Rostedt
2021-03-30 15:32       ` Tzvetomir Stoyanov
2021-03-30 16:03         ` Steven Rostedt
2021-03-30  1:03 ` [RFC][PATCH 14/13 v2] libtracefs: Just past one filter in for tracefs_function_filter() Steven Rostedt
2021-03-30 14:31   ` Tzvetomir Stoyanov

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210330005247.820340155@goodmis.org \
    --to=rostedt@goodmis.org \
    --cc=linux-trace-devel@vger.kernel.org \
    --cc=sameeruddin.shaik8@gmail.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-Trace-Devel Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-trace-devel/0 linux-trace-devel/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-trace-devel linux-trace-devel/ https://lore.kernel.org/linux-trace-devel \
		linux-trace-devel@vger.kernel.org
	public-inbox-index linux-trace-devel

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-trace-devel


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git