From: David Howells <dhowells@redhat.com>
To: Randy Dunlap <rdunlap@infradead.org>
Cc: dhowells@redhat.com, viro@zeniv.linux.org.uk,
linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-security-module@vger.kernel.org,
linux-fsdevel@vger.kernel.org, linux-afs@lists.infradead.org
Subject: Re: [PATCH 03/24] VFS: Introduce the structs and doc for a filesystem context [ver #7]
Date: Tue, 01 May 2018 15:29:10 +0100 [thread overview]
Message-ID: <8450.1525184950@warthog.procyon.org.uk> (raw)
In-Reply-To: <05034a85-013b-30b6-ce17-4c95d4cab195@infradead.org>
Randy Dunlap <rdunlap@infradead.org> wrote:
> > + (2) Parse the options and attach them to the context. Options may be passed
> > + individually from userspace.
>
> Does this say that step (2) can be multiple small steps?
Perhaps "phase (2)" would be a better name than "step (2)". During (2),
multiple argument-supplying calls may be made.
> How does step (2) know when userspace has completed sending individual
> options?
Moving to phase (3) terminates phase (2). This is triggered by userspace
writing "x create" or "x reconfigure" to the fd as things stand.
> > + (6) Return an error message attached to the context.
>
> where/how is this done?
That got taken out and made general - which Linus then objected to. I need to
reinsert this and make it fscontext-specific as most people would really like
to have it, the mount process being able to produce so many weird and
wonderful errors.
> > +When the VFS creates this, it allocates ->fs_context_size bytes (as specified
> > +by the file_system_type object) to hold both the fs_context struct and any
> > +extra data required by the filesystem. The fs_context struct is placed at the
> > +beginning of this space. Any extra space beyond that is for use by the
> > +filesystem. The filesystem should wrap the struct in its own, e.g.:
>
> in its own struct, e.g.:
How about "... The filesystem should wrap the struct in one of its own, e.g."?
> > + (*) int security_fs_context_parse_option(struct fs_context *fc, char *opt);
> > +
> > + Called for each mount option. The arguments are as for the
> > + ->parse_option() method. An active LSM may reject one with an error, pass
> > + one over and return 0 or consume one and return 1. If consumed, the
>
> What does "pass one over" mean?
How about:
An active LSM may return 0 to pass the option on to the filesystem, 1
to cause the option to be discarded or an error to cause the option to
be rejected.
David
next prev parent reply other threads:[~2018-05-01 14:29 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-19 13:31 [PATCH 00/24] VFS: Introduce filesystem context [ver #7] David Howells
2018-04-19 13:31 ` [PATCH 01/24] vfs: Undo an overly zealous MS_RDONLY -> SB_RDONLY conversion " David Howells
2018-04-19 13:31 ` [PATCH 02/24] VFS: Suppress MS_* flag defs within the kernel unless explicitly enabled " David Howells
2018-04-19 13:31 ` [PATCH 03/24] VFS: Introduce the structs and doc for a filesystem context " David Howells
2018-04-23 3:36 ` Randy Dunlap
2018-05-01 14:29 ` David Howells [this message]
2018-05-01 15:31 ` Randy Dunlap
2018-04-19 13:31 ` [PATCH 04/24] VFS: Add LSM hooks for " David Howells
2018-04-19 20:32 ` Paul Moore
2018-04-20 15:35 ` David Howells
2018-04-23 13:25 ` Stephen Smalley
2018-04-24 15:22 ` David Howells
2018-04-25 14:07 ` Stephen Smalley
2018-04-19 13:31 ` [PATCH 05/24] apparmor: Implement security hooks for the new mount API " David Howells
2018-05-04 0:10 ` John Johansen
2018-05-11 12:20 ` David Howells
2018-04-19 13:31 ` [PATCH 06/24] tomoyo: " David Howells
2018-04-19 13:31 ` [PATCH 07/24] smack: Implement filesystem context security hooks " David Howells
2018-04-19 13:31 ` [PATCH 08/24] VFS: Require specification of size of mount data for internal mounts " David Howells
2018-04-19 13:32 ` [PATCH 09/24] VFS: Implement a filesystem superblock creation/configuration context " David Howells
2018-04-19 13:32 ` [PATCH 10/24] VFS: Remove unused code after filesystem context changes " David Howells
2018-04-19 13:32 ` [PATCH 11/24] procfs: Move proc_fill_super() to fs/proc/root.c " David Howells
2018-04-19 13:32 ` [PATCH 12/24] proc: Add fs_context support to procfs " David Howells
2018-06-19 3:34 ` [12/24] " Andrei Vagin
2018-06-26 6:13 ` Andrei Vagin
2018-06-26 7:27 ` Andrei Vagin
2018-06-26 8:57 ` David Howells
2018-06-28 5:50 ` Andrei Vagin
2018-04-19 13:32 ` [PATCH 13/24] ipc: Convert mqueue fs to fs_context " David Howells
2018-04-19 13:32 ` [PATCH 14/24] cpuset: Use " David Howells
2018-04-19 13:32 ` [PATCH 15/24] kernfs, sysfs, cgroup, intel_rdt: Support " David Howells
2018-04-19 13:33 ` [PATCH 16/24] hugetlbfs: Convert to " David Howells
2018-04-19 13:33 ` [PATCH 17/24] VFS: Remove kern_mount_data() " David Howells
2018-04-19 13:33 ` [PATCH 18/24] VFS: Implement fsopen() to prepare for a mount " David Howells
2018-04-19 13:33 ` [PATCH 19/24] VFS: Implement fsmount() to effect a pre-configured " David Howells
2018-04-19 13:33 ` [PATCH 20/24] afs: Fix server record deletion " David Howells
2018-04-19 13:33 ` [PATCH 21/24] net: Export get_proc_net() " David Howells
2018-04-19 13:33 ` [PATCH 22/24] afs: Add fs_context support " David Howells
2018-04-19 13:33 ` [PATCH 23/24] afs: Implement namespacing " David Howells
2018-04-19 13:33 ` [PATCH 24/24] afs: Use fs_context to pass parameters over automount " David Howells
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=8450.1525184950@warthog.procyon.org.uk \
--to=dhowells@redhat.com \
--cc=linux-afs@lists.infradead.org \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-nfs@vger.kernel.org \
--cc=linux-security-module@vger.kernel.org \
--cc=rdunlap@infradead.org \
--cc=viro@zeniv.linux.org.uk \
/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
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
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).