linux-kernel - RE: [PATCH v2] Add new open(2) flag

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Message-ID: <4b39cf528148470c934fb5823b35e9d5@AcuMS.aculab.com>
Date:   Mon, 2 Jan 2023 14:01:38 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Ameer Hamza' <ahamza@...ystems.com>,
        "viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
        "jlayton@...nel.org" <jlayton@...nel.org>,
        "chuck.lever@...cle.com" <chuck.lever@...cle.com>,
        "arnd@...db.de" <arnd@...db.de>,
        "guoren@...nel.org" <guoren@...nel.org>,
        "palmer@...osinc.com" <palmer@...osinc.com>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "slark_xiao@....com" <slark_xiao@....com>,
        "richard.henderson@...aro.org" <richard.henderson@...aro.org>,
        "ink@...assic.park.msu.ru" <ink@...assic.park.msu.ru>,
        "mattst88@...il.com" <mattst88@...il.com>,
        "James.Bottomley@...senPartnership.com" 
        <James.Bottomley@...senPartnership.com>,
        "deller@....de" <deller@....de>,
        "davem@...emloft.net" <davem@...emloft.net>
CC:     "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "awalker@...ystems.com" <awalker@...ystems.com>,
        "sparclinux@...r.kernel.org" <sparclinux@...r.kernel.org>,
        "linux-parisc@...r.kernel.org" <linux-parisc@...r.kernel.org>,
        "linux-alpha@...r.kernel.org" <linux-alpha@...r.kernel.org>
Subject: RE: [PATCH v2] Add new open(2) flag - O_EMPTY_PATH

From: Ameer Hamza
> Sent: 31 December 2022 23:56
> 
> This patch adds a new flag O_EMPTY_PATH that allows openat and open
> system calls to open a file referenced by fd if the path is empty,
> and it is very similar to the FreeBSD O_EMPTY_PATH flag. This can be
> beneficial in some cases since it would avoid having to grant /proc
> access to things like samba containers for reopening files to change
> flags in a race-free way.
> 

But what does it do?
(Apart from add code to a common kernel code path.)

	David

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