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From:   Nixiaoming <nixiaoming@huawei.com>
To:     Eric Paris <eparis@parisplace.org>,
        "rlove@rlove.org" <rlove@rlove.org>,
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CC:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>
Subject: Is it possible to add pid and comm members to the event structure
 to increase the display of user and thread information?
Thread-Topic: Is it possible to add pid and comm members to the event
 structure to increase the display of user and thread information?
Thread-Index: AdRJmkzwtMeGnSbeRVCa8sLtVjSk6w==
Date:   Tue, 11 Sep 2018 06:51:43 +0000
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Inotify api cannot display information about users and processes.
That is, you can only know that the file event is generated, but you don't know who triggered the event, which is not conducive to fault location.
Is it possible to add pid and comm members to the event structure to increase the display of user and thread information?

Example:
diff --git a/fs/notify/inotify/inotify.h b/fs/notify/inotify/inotify.h
index 7e4578d..be91844 100644
--- a/fs/notify/inotify/inotify.h
+++ b/fs/notify/inotify/inotify.h
@@ -7,6 +7,8 @@ struct inotify_event_info {
        struct fsnotify_event fse;
        int wd;
        u32 sync_cookie;
+ int pid;
+ char comm[TASK_COMM_LEN];
        int name_len;
        char name[];
 };
diff --git a/fs/notify/inotify/inotify_fsnotify.c b/fs/notify/inotify/inotify_fsnotify.c
index f4184b4..f7ad298 100644
--- a/fs/notify/inotify/inotify_fsnotify.c
+++ b/fs/notify/inotify/inotify_fsnotify.c
@@ -117,6 +117,8 @@ int inotify_handle_event(struct fsnotify_group *group,
        fsnotify_init_event(fsn_event, inode, mask);
        event->wd = i_mark->wd;
        event->sync_cookie = cookie;
+ event->pid = current->pid;
+ strncpy(event->comm, current->comm, TASK_COMM_LEN);
        event->name_len = len;
        if (len)
                strcpy(event->name, file_name);