linux-kernel - FS_IOC_GETFSLABEL and FS_IOC

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Message-ID: <20191228143651.bjb4sjirn2q3xup4@pali>
Date:   Sat, 28 Dec 2019 15:36:51 +0100
From:   Pali Rohár <pali.rohar@...il.com>
To:     Eric Sandeen <sandeen@...hat.com>,
        Andreas Dilger <adilger@...ger.ca>,
        David Sterba <dsterba@...e.com>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: FS_IOC_GETFSLABEL and FS_IOC_SETFSLABEL

Hello!

I see that you have introduced in commit 62750d0 two new IOCTLs for
filesyetems: FS_IOC_GETFSLABEL and FS_IOC_SETFSLABEL.

I would like to ask, are these two new ioctls mean to be generic way for
userspace to get or set fs label independently of which filesystem is
used? Or are they only for btrfs?

Because I was not able to find any documentation for it, what is format
of passed buffer... null-term string? fixed-length? and in which
encoding? utf-8? latin1? utf-16? or filesystem dependent?

-- 
Pali Rohár
pali.rohar@...il.com

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