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From: David Howells <dhowells@redhat.com>
To: torvalds@linux-foundation.org, viro@zeniv.linux.org.uk
Cc: dhowells@redhat.com, casey@schaufler-ca.com, sds@tycho.nsa.gov,
	nicolas.dichtel@6wind.com, raven@themaw.net,
	christian@brauner.io, andres@anarazel.de, jlayton@redhat.com,
	dray@redhat.com, kzak@redhat.com, keyrings@vger.kernel.org,
	linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	linux-security-module@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH 04/17] pipe: Add O_NOTIFICATION_PIPE [ver #5]
Date: Wed, 18 Mar 2020 15:03:50 +0000	[thread overview]
Message-ID: <158454383029.2863966.1921520389317717899.stgit@warthog.procyon.org.uk> (raw)
In-Reply-To: <158454378820.2863966.10496767254293183123.stgit@warthog.procyon.org.uk>

Add an O_NOTIFICATION_PIPE flag that can be passed to pipe2() to indicate
that the pipe being created is going to be used for notifications.  This
suppresses the use of splice(), vmsplice(), tee() and sendfile() on the
pipe as calling iov_iter_revert() on a pipe when a kernel notification
message has been inserted into the middle of a multi-buffer splice will be
messy.

The flag is given the same value as O_EXCL as it seems unlikely that
this flag will ever be applicable to pipes and I don't want to use up
another O_* bit unnecessarily.  An alternative could be to add a pipe3()
system call.

Signed-off-by: David Howells <dhowells@redhat.com>
---

 include/uapi/linux/watch_queue.h |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/uapi/linux/watch_queue.h b/include/uapi/linux/watch_queue.h
index 5f3d21e8a34b..9df72227f515 100644
--- a/include/uapi/linux/watch_queue.h
+++ b/include/uapi/linux/watch_queue.h
@@ -3,6 +3,9 @@
 #define _UAPI_LINUX_WATCH_QUEUE_H
 
 #include <linux/types.h>
+#include <linux/fcntl.h>
+
+#define O_NOTIFICATION_PIPE	O_EXCL	/* Parameter to pipe2() selecting notification pipe */
 
 enum watch_notification_type {
 	WATCH_TYPE_META		= 0,	/* Special record */

  parent reply	other threads:[~2020-03-18 15:03 UTC|newest]

Thread overview: 87+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-18 15:03 [PATCH 00/17] pipe: Keyrings, mount and superblock notifications [ver #5] David Howells
2020-03-18 15:03 ` David Howells
2020-03-18 15:03 ` [PATCH 01/17] uapi: General notification queue definitions " David Howells
2020-03-18 15:03 ` [PATCH 02/17] security: Add hooks to rule on setting a watch " David Howells
2020-03-18 15:03   ` David Howells
2020-03-18 18:56   ` James Morris
2020-03-18 18:56     ` James Morris
2020-03-18 15:03 ` [PATCH 03/17] security: Add a hook for the point of notification insertion " David Howells
2020-03-18 15:03   ` David Howells
2020-03-18 18:57   ` James Morris
2020-03-18 18:57     ` James Morris
2020-03-18 15:03 ` David Howells [this message]
2020-03-18 15:03 ` [PATCH 05/17] pipe: Add general notification queue support " David Howells
2020-03-18 15:03   ` David Howells
2020-03-18 15:04 ` [PATCH 06/17] watch_queue: Add a key/keyring notification facility " David Howells
2020-03-18 15:04   ` David Howells
2020-03-18 19:04   ` James Morris
2020-03-18 19:04     ` James Morris
2020-03-18 15:04 ` [PATCH 07/17] Add sample notification program " David Howells
2020-03-18 15:04   ` David Howells
2020-03-18 15:04 ` [PATCH 08/17] pipe: Allow buffers to be marked read-whole-or-error for notifications " David Howells
2020-03-18 15:04   ` David Howells
2020-03-18 15:04 ` [PATCH 09/17] pipe: Add notification lossage handling " David Howells
2020-03-18 15:04   ` David Howells
2020-03-18 15:04 ` [PATCH 10/17] selinux: Implement the watch_key security hook " David Howells
2020-03-18 15:04   ` David Howells
2020-03-18 19:06   ` James Morris
2020-03-18 19:06     ` James Morris
2020-03-18 15:04 ` [PATCH 11/17] smack: Implement the watch_key and post_notification hooks " David Howells
2020-03-18 15:04   ` David Howells
2020-03-18 15:05 ` [PATCH 12/17] watch_queue: Add security hooks to rule on setting mount and sb watches " David Howells
2020-03-18 15:05   ` David Howells
2020-03-18 19:07   ` James Morris
2020-03-18 19:07     ` James Morris
2020-03-18 15:05 ` [PATCH 13/17] watch_queue: Implement mount topology and attribute change notifications " David Howells
2020-03-18 15:05   ` David Howells
2020-04-02 15:19   ` Miklos Szeredi
2020-04-02 15:19     ` Miklos Szeredi
2020-06-14  3:07     ` Ian Kent
2020-06-14  3:07       ` Ian Kent
2020-06-15  8:44       ` Miklos Szeredi
2020-06-15  8:44         ` Miklos Szeredi
2020-07-23 10:48   ` David Howells
2020-07-23 10:48     ` David Howells
2020-08-03  9:29     ` Miklos Szeredi
2020-08-03  9:29       ` Miklos Szeredi
2020-08-04 11:38       ` Ian Kent
2020-08-04 11:38         ` Ian Kent
2020-08-04 13:19         ` Miklos Szeredi
2020-08-04 13:19           ` Miklos Szeredi
2020-08-05  1:53           ` Ian Kent
2020-08-05  1:53             ` Ian Kent
2020-08-05  7:43             ` Miklos Szeredi
2020-08-05  7:43               ` Miklos Szeredi
2020-08-05 11:36               ` Ian Kent
2020-08-05 11:36                 ` Ian Kent
2020-08-05 11:56                 ` Miklos Szeredi
2020-08-05 11:56                   ` Miklos Szeredi
2020-07-24 10:19   ` David Howells
2020-07-24 10:19     ` David Howells
2020-07-24 10:44     ` Ian Kent
2020-07-24 10:44       ` Ian Kent
2020-07-24 11:36     ` David Howells
2020-07-24 11:36       ` David Howells
2020-08-03 10:02       ` Miklos Szeredi
2020-08-03 10:02         ` Miklos Szeredi
2020-08-03 10:08       ` David Howells
2020-08-03 10:08         ` David Howells
2020-08-03 10:18       ` David Howells
2020-08-03 10:18         ` David Howells
2020-08-03 11:17         ` Miklos Szeredi
2020-08-03 11:17           ` Miklos Szeredi
2020-08-03 11:49         ` David Howells
2020-08-03 11:49           ` David Howells
2020-08-03 12:01           ` Ian Kent
2020-08-03 12:01             ` Ian Kent
2020-08-03 12:31           ` David Howells
2020-08-03 12:31             ` David Howells
2020-08-03 14:30             ` Ian Kent
2020-08-03 14:30               ` Ian Kent
2020-03-18 15:05 ` [PATCH 14/17] watch_queue: sample: Display mount tree " David Howells
2020-03-18 15:05   ` David Howells
2020-03-18 15:05 ` [PATCH 15/17] watch_queue: Introduce a non-repeating system-unique superblock ID " David Howells
2020-03-18 15:05 ` [PATCH 16/17] watch_queue: Add superblock notifications " David Howells
2020-03-18 15:05   ` David Howells
2020-03-18 15:05 ` [PATCH 17/17] watch_queue: sample: Display " David Howells
2020-03-18 15:05   ` David Howells

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