linux-kernel - [PATCH 09/15] task_diag: add a flag to mark incomplete messages

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Date:	Mon, 11 Apr 2016 16:35:49 -0700
From:	Andrey Vagin <avagin@...nvz.org>
To:	linux-kernel@...r.kernel.org
Cc:	Andrey Vagin <avagin@...nvz.org>, Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	Roger Luethi <rl@...lgate.ch>, Arnd Bergmann <arnd@...db.de>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	David Ahern <dsahern@...il.com>,
	Andy Lutomirski <luto@...capital.net>,
	Pavel Odintsov <pavel.odintsov@...il.com>
Subject: [PATCH 09/15] task_diag: add a flag to mark incomplete messages

If all information about a process don't fit in a message, it's marked
by the TASK_DIAG_FLAG_CONT flag and the next message will describe the
same process.

Signed-off-by: Andrey Vagin <avagin@...nvz.org>
---
 fs/proc/task_diag.c            | 3 +++
 include/uapi/linux/task_diag.h | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/fs/proc/task_diag.c b/fs/proc/task_diag.c
index 00db32d..cd10374 100644
--- a/fs/proc/task_diag.c
+++ b/fs/proc/task_diag.c
@@ -415,6 +415,7 @@ static int task_diag_fill(struct task_struct *tsk, struct sk_buff *skb,
 	msg = nlmsg_data(nlh);
 	msg->pid  = task_pid_nr_ns(tsk, pidns);
 	msg->tgid = task_tgid_nr_ns(tsk, pidns);
+	msg->flags |= TASK_DIAG_FLAG_CONT;
 
 	if (show_flags & TASK_DIAG_SHOW_BASE) {
 		if (i >= n)
@@ -450,6 +451,8 @@ static int task_diag_fill(struct task_struct *tsk, struct sk_buff *skb,
 		i++;
 	}
 
+	msg->flags &= ~TASK_DIAG_FLAG_CONT;
+
 	nlmsg_end(skb, nlh);
 	if (cb)
 		cb->attr = 0;
diff --git a/include/uapi/linux/task_diag.h b/include/uapi/linux/task_diag.h
index 8bccd02..e967c5b 100644
--- a/include/uapi/linux/task_diag.h
+++ b/include/uapi/linux/task_diag.h
@@ -13,6 +13,8 @@ struct task_diag_msg {
 	__u32 flags;
 };
 
+#define TASK_DIAG_FLAG_CONT 0x00000001
+
 enum {
 	TASK_DIAG_BASE	= 0,
 	TASK_DIAG_CRED,
-- 
2.5.5