linux-kernel - Re: [RFC PATCH] getting misc stats/attributes via xattr API

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Message-ID: <e57733cd-364d-84e0-cfe0-fd41de14f434@bytedance.com>
Date:   Mon, 14 Nov 2022 17:00:18 +0800
From:   Abel Wu <wuyun.abel@...edance.com>
To:     Miklos Szeredi <miklos@...redi.hu>, linux-fsdevel@...r.kernel.org
Cc:     Dave Chinner <david@...morbit.com>, Theodore Ts'o <tytso@....edu>,
        Karel Zak <kzak@...hat.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Christian Brauner <brauner@...nel.org>,
        linux-kernel@...r.kernel.org,
        Linux API <linux-api@...r.kernel.org>,
        linux-man <linux-man@...r.kernel.org>,
        LSM <linux-security-module@...r.kernel.org>,
        Ian Kent <raven@...maw.net>,
        David Howells <dhowells@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <christian@...uner.io>,
        Amir Goldstein <amir73il@...il.com>,
        James Bottomley <James.Bottomley@...senpartnership.com>
Subject: Re: [RFC PATCH] getting misc stats/attributes via xattr API

Hi Miklos and anyone interested in this proposal, is there any update on
this? Sorry that I didn't find any..

Thanks & Best regards,
	Abel

On 5/3/22 8:23 PM, Miklos Szeredi wrote:
> This is a simplification of the getvalues(2) prototype and moving it to the
> getxattr(2) interface, as suggested by Dave.
> 
> The patch itself just adds the possibility to retrieve a single line of
> /proc/$$/mountinfo (which was the basic requirement from which the fsinfo
> patchset grew out of).
> 
> But this should be able to serve Amir's per-sb iostats, as well as a host of
> other cases where some statistic needs to be retrieved from some object.  Note:
> a filesystem object often represents other kinds of objects (such as processes
> in /proc) so this is not limited to fs attributes.
> 
> This also opens up the interface to setting attributes via setxattr(2).
>