linux-kernel - Re: [PATCH v2 0/2] fs, close_range: add flag CLOSE_RANGE

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Date:   Thu, 29 Oct 2020 17:47:53 +0100
From:   Giuseppe Scrivano <gscrivan@...hat.com>
To:     Christian Brauner <christian.brauner@...ntu.com>
Cc:     linux-kernel@...r.kernel.org, linux@...musvillemoes.dk,
        viro@...iv.linux.org.uk, linux-fsdevel@...r.kernel.org,
        containers@...ts.linux-foundation.org
Subject: Re: [PATCH v2 0/2] fs, close_range: add flag CLOSE_RANGE_CLOEXEC

Hi Christian,

Christian Brauner <christian.brauner@...ntu.com> writes:

> On Mon, Oct 19, 2020 at 12:26:52PM +0200, Giuseppe Scrivano wrote:
>> When the new flag is used, close_range will set the close-on-exec bit
>> for the file descriptors instead of close()-ing them.
>> 
>> It is useful for e.g. container runtimes that want to minimize the
>> number of syscalls used after a seccomp profile is installed but want
>> to keep some fds open until the container process is executed.
>> 
>> v1->v2:
>> * move close_range(..., CLOSE_RANGE_CLOEXEC) implementation to a separate function.
>> * use bitmap_set() to set the close-on-exec bits in the bitmap.
>> * add test with rlimit(RLIMIT_NOFILE) in place.
>> * use "cur_max" that is already used by close_range(..., 0).
>
> I'm picking this up for some testing, thanks
> Christian

thanks!  I've addressed the comments you had for v2 and pushed them
here[1] but I've not sent yet v3 as I was waiting for a feedback from Al
whether using bitmap_set() is fine.

Regards,
Giuseppe

[1] https://github.com/giuseppe/linux/tree/close-range-cloexec