LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Randy Dunlap <rdunlap@infradead.org>
To: David Howells <dhowells@redhat.com>
Cc: 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, 1 May 2018 08:31:00 -0700	[thread overview]
Message-ID: <96dacc1b-cffa-3aa2-71f5-70c8159c805e@infradead.org> (raw)
In-Reply-To: <8450.1525184950@warthog.procyon.org.uk>

On 05/01/2018 07:29 AM, David Howells wrote:
> 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.

Ack.

>> 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."?

OK.

>>> + (*) 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.

Much better. Thanks.

-- 
~Randy

  reply	other threads:[~2018-05-01 15:31 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-19 13:31 [PATCH 00/24] VFS: Introduce " 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
2018-05-01 15:31     ` Randy Dunlap [this message]
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=96dacc1b-cffa-3aa2-71f5-70c8159c805e@infradead.org \
    --to=rdunlap@infradead.org \
    --cc=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=viro@zeniv.linux.org.uk \
    --subject='Re: [PATCH 03/24] VFS: Introduce the structs and doc for a filesystem context [ver #7]' \
    /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).