From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jonathan Corbet Subject: Re: [PATCH 24/32] vfs: syscall: Add fsopen() to prepare for superblock creation [ver #9] Date: Wed, 11 Jul 2018 09:51:59 -0600 Message-ID: <20180711095159.08e5435c@lwn.net> References: <153126248868.14533.9751473662727327569.stgit@warthog.procyon.org.uk> <153126264966.14533.3388004240803696769.stgit@warthog.procyon.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 8bit Return-path: In-Reply-To: <153126264966.14533.3388004240803696769.stgit@warthog.procyon.org.uk> Sender: linux-kernel-owner@vger.kernel.org To: David Howells Cc: viro@zeniv.linux.org.uk, linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org, torvalds@linux-foundation.org, linux-kernel@vger.kernel.org List-Id: linux-api@vger.kernel.org On Tue, 10 Jul 2018 23:44:09 +0100 David Howells wrote: > sfd = fsopen("ext4", FSOPEN_CLOEXEC); > write(sfd, "s /dev/sdb1"); // note I'm ignoring write's length arg > write(sfd, "o noatime"); > write(sfd, "o acl"); > write(sfd, "o user_attr"); > write(sfd, "o iversion"); > write(sfd, "o "); > write(sfd, "r /my/container"); // root inside the fs > write(sfd, "x create"); // create the superblock A minor detail but ... the "r" operation mentioned above is not actually implemented in this system call. jon