From: "Theodore Y. Ts'o" <tytso@mit.edu>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Bart Van Assche <bvanassche@acm.org>,
linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org,
Hannes Reinecke <hare@suse.com>,
"Martin K. Petersen" <martin.petersen@oracle.com>,
James Bottomley <James.Bottomley@hansenpartnership.com>,
Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH 0/3] SG_IO command filtering via sysfs
Date: Fri, 16 Nov 2018 12:35:51 -0500 [thread overview]
Message-ID: <20181116173551.GG20617@thunk.org> (raw)
In-Reply-To: <c819493c-2a45-4911-8879-310c910ee42a@redhat.com>
On Fri, Nov 16, 2018 at 08:01:29AM +0100, Paolo Bonzini wrote:
> On 16/11/18 01:37, Bart Van Assche wrote:
> > All user space interfaces in the Linux kernel for storage that I'm familiar
> > with not only allow configuration of parameters but also make it easy to
> > query which parameters have been configured. The existing sysfs and configfs
> > interfaces demonstrate this. Using BPF to configure SG/IO access has a
> > significant disadvantage, namely that it is very hard to figure out what has
> > been configured. Figuring out what has been configured namely requires
> > disassembling BPF. I'm not sure anyone will be enthusiast about this.
>
> Well, that's a problem with BPF in general. With great power comes
> great obscurability.
You can also make the same complaint about kernel modules; that it's
impossible to figure exactly what a kernel modules does without
disassembling them. However, you can a one-line description of what
it does using modinfo:
% modinfo async_pq
filename: /lib/modules/4.19.0-00022-g831156939ae8/kernel/crypto/async_tx/async_pq.ko
license: GPL
description: asynchronous raid6 syndrome generation/validation
srcversion: 529102C736C4FED181C15A8
depends: raid6_pq,async_tx,async_xor
retpoline: Y
intree: Y
name: async_pq
vermagic: 4.19.0-00022-g831156939ae8 SMP mod_unload modversions
- Ted
next prev parent reply other threads:[~2018-11-16 17:36 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-10 16:35 [PATCH 0/3] SG_IO command filtering via sysfs Paolo Bonzini
2018-11-10 16:35 ` [PATCH 1/3] block: add back queue-private command filter Paolo Bonzini
2018-11-10 16:35 ` [PATCH 2/3] scsi: create an all-one filter for scanners Paolo Bonzini
2018-11-10 16:35 ` [PATCH 3/3] block: add back command filter modification via sysfs Paolo Bonzini
2018-11-16 5:46 ` Bart Van Assche
2018-11-16 7:00 ` Paolo Bonzini
2018-11-16 14:42 ` Bart Van Assche
2018-11-10 19:05 ` [PATCH 0/3] SG_IO command filtering " Theodore Y. Ts'o
2018-11-11 13:26 ` Paolo Bonzini
2018-11-11 14:14 ` Theodore Y. Ts'o
2018-11-16 0:26 ` Paolo Bonzini
2018-11-16 0:37 ` Bart Van Assche
2018-11-16 7:01 ` Paolo Bonzini
2018-11-16 17:35 ` Theodore Y. Ts'o [this message]
2018-11-11 13:14 ` Christoph Hellwig
2018-11-11 13:42 ` Theodore Y. Ts'o
2018-11-12 8:20 ` Christoph Hellwig
2018-11-12 10:17 ` Paolo Bonzini
2018-11-16 9:32 ` Christoph Hellwig
2018-11-16 9:45 ` Paolo Bonzini
2018-11-16 9:48 ` Christoph Hellwig
2018-11-16 17:43 ` Theodore Y. Ts'o
2018-11-16 18:17 ` Bart Van Assche
2018-11-16 21:08 ` Paolo Bonzini
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