LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Jeremy Allison <jra@samba.org>
To: Stefan Metzmacher <metze@samba.org>
Cc: "Linus Torvalds" <torvalds@linux-foundation.org>,
	"David Howells" <dhowells@redhat.com>,
	"Aleksa Sarai" <cyphar@cyphar.com>,
	"Al Viro" <viro@zeniv.linux.org.uk>,
	"Ian Kent" <raven@themaw.net>,
	"Miklos Szeredi" <mszeredi@redhat.com>,
	"Christian Brauner" <christian@brauner.io>,
	"Jann Horn" <jannh@google.com>,
	"Darrick J. Wong" <darrick.wong@oracle.com>,
	"Karel Zak" <kzak@redhat.com>,
	jlayton@redhat.com, "Linux API" <linux-api@vger.kernel.org>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	"LSM List" <linux-security-module@vger.kernel.org>,
	"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
	"Ralph Böhme" <slow@samba.org>, "Volker Lendecke" <vl@sernet.de>
Subject: Re: [PATCH 01/14] VFS: Add additional RESOLVE_* flags [ver #18]
Date: Thu, 12 Mar 2020 14:48:54 -0700	[thread overview]
Message-ID: <20200312214854.GA19247@jeremy-acer> (raw)
In-Reply-To: <8d24e9f6-8e90-96bb-6e98-035127af0327@samba.org>

On Thu, Mar 12, 2020 at 06:11:09PM +0100, Stefan Metzmacher wrote:
> Am 12.03.20 um 17:24 schrieb Linus Torvalds:
> > On Thu, Mar 12, 2020 at 2:08 AM Stefan Metzmacher <metze@samba.org> wrote:
> >>
> >> The whole discussion was triggered by the introduction of a completely
> >> new fsinfo() call:
> >>
> >> Would you propose to have 'at_flags' and 'resolve_flags' passed in here?
> > 
> > Yes, I think that would be the way to go.
> 
> Ok, that's also fine for me:-)
> 
> >>> If we need linkat2() and friends, so be it. Do we?
> >>
> >> Yes, I'm going to propose something like this, as it would make the life
> >> much easier for Samba to have the new features available on all path
> >> based syscalls.
> > 
> > Will samba actually use them? I think we've had extensions before that
> > weren't worth the non-portability pain?
> 
> Yes, we're currently moving to the portable *at() calls as a start.
> And we already make use of Linux only feature for performance reasons
> in other places. Having the new resolve flags will make it possible to
> move some of the performance intensive work into non-linux specific
> modules as fallback.
> 
> I hope that we'll use most of this through io_uring in the end,
> that's the reason Jens added the IORING_REGISTER_PERSONALITY feature
> used for IORING_OP_OPENAT2.
> 
> > But yes, if we have a major package like samba use it, then by all
> > means let's add linkat2(). How many things are we talking about? We
> > have a number of system calls that do *not* take flags, but do do
> > pathname walking. I'm thinking things like "mkdirat()"?)
> 
> I haven't looked them up in detail yet.
> Jeremy can you provide a list?

Fixing the flags argument on fchmodat() to actually *implement*
AT_SYMLINK_NOFOLLOW would be a good start :-).

As for the syscalls that don't have
flags I'm thinking of the things like:

getxattr/setxattr/removexattr just off the top of my head.

Jeremy.

  parent reply	other threads:[~2020-03-12 21:49 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-09 14:00 [PATCH 00/14] VFS: Filesystem information " David Howells
2020-03-09 14:00 ` [PATCH 01/14] VFS: Add additional RESOLVE_* flags " David Howells
2020-03-09 20:56   ` Stefan Metzmacher
2020-03-09 21:13   ` David Howells
2020-03-10  0:55   ` Aleksa Sarai
2020-03-10  1:14     ` Linus Torvalds
2020-03-10  7:25     ` David Howells
2020-03-11 17:59       ` Linus Torvalds
2020-03-12  9:08         ` Stefan Metzmacher
2020-03-12 16:24           ` Linus Torvalds
2020-03-12 17:11             ` Stefan Metzmacher
2020-03-12 19:37               ` Al Viro
2020-03-12 21:48               ` Jeremy Allison [this message]
2020-03-13  9:59               ` Aleksa Sarai
2020-03-13 10:00                 ` Aleksa Sarai
2020-03-13 16:48                 ` Jeremy Allison
2020-03-13 18:28                 ` Al Viro
2020-03-13 18:35                   ` Jeremy Allison
2020-03-16 14:21                   ` Aleksa Sarai
2020-03-16 14:20                     ` Aleksa Sarai
2020-03-12 19:25             ` Al Viro
2020-03-12 16:56           ` David Howells
2020-03-12 18:09             ` Linus Torvalds
2020-03-13  9:53               ` Aleksa Sarai
2020-03-13  9:50         ` Aleksa Sarai
2020-03-09 14:01 ` [PATCH 02/14] fsinfo: Add fsinfo() syscall to query filesystem information " David Howells
2020-03-10  9:31   ` Christian Brauner
2020-03-10  9:32     ` [PATCH v19 01/14] fsinfo: Add fsinfo() syscall to query filesystem information Christian Brauner
2020-03-10  9:32       ` [PATCH v19 14/14] arch: wire up fsinfo syscall Christian Brauner
2020-03-09 14:01 ` [PATCH 03/14] fsinfo: Provide a bitmap of supported features [ver #18] David Howells
2020-03-09 14:01 ` [PATCH 04/14] fsinfo: Allow retrieval of superblock devname, options and stats " David Howells
2020-03-09 14:01 ` [PATCH 05/14] fsinfo: Allow fsinfo() to look up a mount object by ID " David Howells
2020-03-09 14:01 ` [PATCH 06/14] fsinfo: Add a uniquifier ID to struct mount " David Howells
2020-03-09 14:01 ` [PATCH 07/14] fsinfo: Allow mount information to be queried " David Howells
2020-03-10  9:04   ` Miklos Szeredi
2020-03-09 14:02 ` [PATCH 08/14] fsinfo: Allow the mount topology propogation flags to be retrieved " David Howells
2020-03-10  8:42   ` Christian Brauner
2020-03-09 14:02 ` [PATCH 09/14] fsinfo: Provide notification overrun handling support " David Howells
2020-03-09 14:02 ` [PATCH 10/14] fsinfo: sample: Mount listing program " David Howells
2020-03-09 14:02 ` [PATCH 11/14] fsinfo: Add API documentation " David Howells
2020-03-09 14:02 ` [PATCH 12/14] fsinfo: Add support for AFS " David Howells
2020-03-09 14:02 ` [PATCH 13/14] fsinfo: Example support for Ext4 " David Howells
2020-03-09 14:02 ` [PATCH 14/14] fsinfo: Example support for NFS " David Howells
2020-03-09 17:50 ` [PATCH 00/14] VFS: Filesystem information " Jeff Layton
2020-03-09 19:22   ` Andres Freund
2020-03-09 22:49     ` Jeff Layton
2020-03-10  0:18       ` Andres Freund
2020-03-09 20:02 ` Miklos Szeredi
2020-03-09 22:52 ` David Howells
2020-03-10  9:18   ` Miklos Szeredi

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200312214854.GA19247@jeremy-acer \
    --to=jra@samba.org \
    --cc=christian@brauner.io \
    --cc=cyphar@cyphar.com \
    --cc=darrick.wong@oracle.com \
    --cc=dhowells@redhat.com \
    --cc=jannh@google.com \
    --cc=jlayton@redhat.com \
    --cc=kzak@redhat.com \
    --cc=linux-api@vger.kernel.org \
    --cc=linux-fsdevel@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-security-module@vger.kernel.org \
    --cc=metze@samba.org \
    --cc=mszeredi@redhat.com \
    --cc=raven@themaw.net \
    --cc=slow@samba.org \
    --cc=torvalds@linux-foundation.org \
    --cc=viro@zeniv.linux.org.uk \
    --cc=vl@sernet.de \
    --subject='Re: [PATCH 01/14] VFS: Add additional RESOLVE_* flags [ver #18]' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).