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From: Amir Goldstein <amir73il@gmail.com>
To: Jan Kara <jack@suse.cz>
Cc: Matthew Bobrowski <mbobrowski@mbobrowski.org>,
	linux-fsdevel@vger.kernel.org
Subject: [PATCH v4 02/10] fanotify: report both events on parent and child with single callback
Date: Thu,  2 Jul 2020 15:57:36 +0300	[thread overview]
Message-ID: <20200702125744.10535-3-amir73il@gmail.com> (raw)
In-Reply-To: <20200702125744.10535-1-amir73il@gmail.com>

fsnotify usually calls fanotify_handle_event() once for watching parent
and once for watching child, even though both events are exactly the
same and will most likely get merged before user reads them.

Add support for handling both event flavors with a single callback
instead of two callbacks when marks iterator contains both inode and
child entries.

fanotify will queue a single event in that case and the unneeded merge
will be avoided.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
---
 fs/notify/fanotify/fanotify.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c
index c3986fbb6801..7f40b8f57934 100644
--- a/fs/notify/fanotify/fanotify.c
+++ b/fs/notify/fanotify/fanotify.c
@@ -246,8 +246,11 @@ static u32 fanotify_group_event_mask(struct fsnotify_group *group,
 		/*
 		 * If the event is for a child and this mark doesn't care about
 		 * events on a child, don't send it!
+		 * The special object type "child" always cares about events on
+		 * a child, because it refers to the child inode itself.
 		 */
 		if (event_mask & FS_EVENT_ON_CHILD &&
+		    type != FSNOTIFY_OBJ_TYPE_CHILD &&
 		    (type != FSNOTIFY_OBJ_TYPE_INODE ||
 		     !(mark->mask & FS_EVENT_ON_CHILD)))
 			continue;
-- 
2.17.1


  parent reply	other threads:[~2020-07-02 12:58 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-02 12:57 [PATCH v4 00/10] fanotify events with name info Amir Goldstein
2020-07-02 12:57 ` [PATCH v4 01/10] inotify: report both events on parent and child with single callback Amir Goldstein
2020-07-02 12:57 ` Amir Goldstein [this message]
2020-07-02 12:57 ` [PATCH v4 03/10] fsnotify: send event to " Amir Goldstein
2020-07-14 10:34   ` Jan Kara
2020-07-14 11:54     ` Amir Goldstein
2020-07-15 17:09       ` Jan Kara
2020-07-15 17:42         ` Amir Goldstein
2020-07-16  6:38           ` Amir Goldstein
2020-07-16  7:39             ` Amir Goldstein
2020-07-16  9:55               ` Amir Goldstein
2020-07-02 12:57 ` [PATCH v4 04/10] fsnotify: send event with parent/name info to sb/mount/non-dir marks Amir Goldstein
2020-07-14 11:54   ` Jan Kara
2020-07-14 12:17     ` Amir Goldstein
2020-07-14 15:31       ` Amir Goldstein
2020-07-02 12:57 ` [PATCH v4 05/10] fsnotify: send MOVE_SELF event with parent/name info Amir Goldstein
2020-07-14 12:13   ` Jan Kara
2020-07-14 12:44     ` Amir Goldstein
2020-07-02 12:57 ` [PATCH v4 06/10] fanotify: add basic support for FAN_REPORT_DIR_FID Amir Goldstein
2020-07-02 12:57 ` [PATCH v4 07/10] fanotify: report events with parent dir fid to sb/mount/non-dir marks Amir Goldstein
2020-07-02 12:57 ` [PATCH v4 08/10] fanotify: add support for FAN_REPORT_NAME Amir Goldstein
2020-07-02 12:57 ` [PATCH v4 09/10] fanotify: report parent fid + name + child fid Amir Goldstein
2020-07-02 12:57 ` [PATCH v4 10/10] fanotify: report parent fid " Amir Goldstein

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