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[bug#56880] [PATCH] gnu: system: file-systems: Add shared flag.

From: Ludovic Courtès
Subject: [bug#56880] [PATCH] gnu: system: file-systems: Add shared flag.
Date: Fri, 05 Aug 2022 11:41:38 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.1 (gnu/linux)


Oleg Pykhalov <> skribis:

> Ludovic Courtès <> writes:
> […]
>>> (option-string->mount-flags): Handle shared flag.
> I looked again on this procedure before merge.  With applied patch it
> will return a wrong bitmask according to the manual page:
> mount(2)
>     The  only other flags that can be specified while changing the propaga‐
>     tion type are MS_REC (described below)  and  MS_SILENT  (which  is  ig‐
>     nored).
> Also I tried to invoke 'mount' from C code, if MS_SHARED specified and
> mountpoint does not exist (not mounted without MS_SHARED before), then
> nothing will happen.

Hmm not sure I follow.

> The procedure is out of the scope adding a shared flag support to
> file-system record.  I see two variants:
> 1. Remove the modification from option-string->mount-flags and merge,
> someone will add when required.
> 2. Modify option-string->mount-flags in such way, that it will return
> multiple bitmasks or in some other way.

I understand option #1 and it sounds reasonable to me.

I’m not sure what option #2 means concretely?


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