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identity=mailfrom; envelope-from="ality@pbrane.org"; helo=MTA-08-3.privateemail.com; client-ip=198.54.127.61 Received: from MTA-08-3.privateemail.com (mta-08-3.privateemail.com [198.54.127.61]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by tb-mx1.topicbox.com (Postfix) with ESMTPS for <9fans@9fans.net>; Sun, 30 May 2021 01:11:11 -0400 (EDT) (envelope-from ality@pbrane.org) Received: from MTA-08.privateemail.com (localhost [127.0.0.1]) by MTA-08.privateemail.com (Postfix) with ESMTP id 80A3A600C3 for <9fans@9fans.net>; Sun, 30 May 2021 01:11:10 -0400 (EDT) Received: from localhost (unknown [10.20.151.208]) by MTA-08.privateemail.com (Postfix) with ESMTPA id D2CC7600C2 for <9fans@9fans.net>; Sun, 30 May 2021 01:11:09 -0400 (EDT) Date: Sat, 29 May 2021 22:11:07 -0700 From: Anthony Martin To: 9fans <9fans@9fans.net> Message-ID: References: <1794694518.393629.1622320572251@ichabod.co-bxl> MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline In-Reply-To: <1794694518.393629.1622320572251@ichabod.co-bxl> X-Virus-Scanned: ClamAV using ClamSMTP Topicbox-Policy-Reasoning: allow: sender is a member Topicbox-Message-UUID: 762c4e92-c105-11eb-b67e-8debec6720cf Archived-At: =?UTF-8?B?PGh0dHBzOi8vOWZhbnMudG9waWNib3guY29tL2dyb3Vwcy85?= =?UTF-8?B?ZmFucy9UMDdjYjc2ODZmZWJlNzJjOC1NMTczNGFhZWE5MDNlZDI3ZjYxNjEy?= =?UTF-8?B?ZjU2Pg==?= List-Help: List-Id: "9fans" <9fans.9fans.net> List-Post: List-Software: Topicbox v0 List-Subscribe: Precedence: list Reply-To: 9fans <9fans@9fans.net> Subject: [9fans] Re: What's a mounted channel? Content-Transfer-Encoding: quoted-printable List-Unsubscribe: , Topicbox-Delivery-ID: 2:9fans:437d30aa-c441-11e9-8a57-d036212d11b0:522be890-2105-11eb-b15e-8d699134e1fa:M1734aaea903ed27f61612f56:1:8j6bo-9GnJbI3smIfv9RSZZRSy61_TFL7MqNbr0u1kM Anonymous AWK fan via 9fans <9fans@9fans.net> once said: > The comments on the #define lines and a commented out section of > stat(2) say (DM|QT)MOUNT indicates a mounted channel, what is this? > > Also, why does exportfs fork and the kernel not send write on closed > pipe notes for mounted channels? When you call mount(2), the mnt(3) driver attempts to negotiate a conversation with the 9p server on the other end of the supplied file descriptor. If the negotiation is successful, the kernel sets a flag on the underlying channel to restrict the set of operations available to user space until the file descriptor is closed. If this wasn't done, any reads, writes, or seeks would interfere with the mount driver's ongoing 9p conversation. Cheers, Anthony ------------------------------------------ 9fans: 9fans Permalink: https://9fans.topicbox.com/groups/9fans/T07cb7686febe72c8-M1734a= aea903ed27f61612f56 Delivery options: https://9fans.topicbox.com/groups/9fans/subscription