linux-kernel - Re: Upcoming: Notifications, FS notifications and fsinfo()

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Message-ID: <2418581.1585691786@warthog.procyon.org.uk>
Date:   Tue, 31 Mar 2020 22:56:26 +0100
From:   David Howells <dhowells@...hat.com>
To:     Lennart Poettering <mzxreary@...inter.de>
Cc:     dhowells@...hat.com, Miklos Szeredi <miklos@...redi.hu>,
        Karel Zak <kzak@...hat.com>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Al Viro <viro@...iv.linux.org.uk>, dray@...hat.com,
        Miklos Szeredi <mszeredi@...hat.com>,
        Steven Whitehouse <swhiteho@...hat.com>,
        Jeff Layton <jlayton@...hat.com>, Ian Kent <raven@...maw.net>,
        andres@...razel.de, keyrings@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Aleksa Sarai <cyphar@...har.com>
Subject: Re: Upcoming: Notifications, FS notifications and fsinfo()

Lennart Poettering <mzxreary@...inter.de> wrote:

> - We also have code that needs to check if /dev/ is plain tmpfs or
>   devtmpfs. We cannot use statfs for that, since in both cases
>   TMPFS_MAGIC is reported, hence we currently parse
>   /proc/self/mountinfo for that to find the fstype string there, which
>   is different for both cases.

btw, fsinfo(FSINFO_ATTR_IDS) gets you the name of the filesystem type in
addition to the magic number.

David