linux-ext4 - [Bug 85381] New: ext4 & tmpfs: Splicing to regular files doesn't trigger inotify

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Date:	Wed, 01 Oct 2014 16:56:36 +0000
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 85381] New: ext4 & tmpfs: Splicing to regular files doesn't
 trigger inotify

https://bugzilla.kernel.org/show_bug.cgi?id=85381

            Bug ID: 85381
           Summary: ext4 & tmpfs: Splicing to regular files doesn't
                    trigger inotify
           Product: File System
           Version: 2.5
    Kernel Version: 3.14
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: ext4
          Assignee: fs_ext4@...nel-bugs.osdl.org
          Reporter: richardpku@...il.com
        Regression: No

* How to reproduce:

/tmp % cat a.c
#define _GNU_SOURCE 1
#include <limits.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>

int main(void)
{
        int pipefd[2];
        pipe(pipefd);

        for (;;) {
                sleep(1);
                write(pipefd[1], "Hello world\n", 12);
                splice(pipefd[0], NULL, 1, NULL, INT_MAX, 0);
        }
}
/tmp % gcc a.c
/tmp % touch a.txt
/tmp % ./a.out > a.txt & tail -f a.txt


* Expected result:

tail prints "Hello world" every second.



* Actual result:

btrfs: Works as expected;
ext4/tmpfs: tail blocks on inotify forever and prints nothing.

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