From: Arnd Bergmann <arnd@arndb.de>
To: Roland Dreier <rdreier@cisco.com>
Cc: Steve Wise <swise@opengridcomputing.com>,
linux-rdma@vger.kernel.org, linux-next@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] RDMA/cxgb4: Add default_llseek to debugfs files.
Date: Wed, 29 Sep 2010 21:29:31 +0200 [thread overview]
Message-ID: <201009292129.31415.arnd@arndb.de> (raw)
In-Reply-To: <ada4od82w5x.fsf@cisco.com>
On Wednesday 29 September 2010 21:21:14 Roland Dreier wrote:
>
> > The main difference between default_llseek and generic_file_llseek
> > is that default_llseek doesn't care about the maximum file size
> > of the underlying file system, which is ULONG_MAX on debugfs,
> > so they are equivalent.
>
> I thought default_llseek also takes the BKL still?
Not any more in linux-next.
> > In general, the preferred one is no_llseek for those files where
> > you know you do not need to seek. If you do, I'd use default_llseek
> > for character devices and generic_file_llseek for file systems
> > that set the s_maxbytes.
>
> The case in question is for debugfs files, so we should use
> generic_file_llseek, right?
Yes, but it's a very weak "should". My automatic conversion script
uses default_llseek.
Arnd
next prev parent reply other threads:[~2010-09-29 19:29 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-29 14:11 [PATCH] RDMA/cxgb4: Add default_llseek to debugfs files Steve Wise
[not found] ` <20100929141112.26944.21931.stgit-T4OLL4TyM9aNDNWfRnPdfg@public.gmane.org>
2010-09-29 17:19 ` Roland Dreier
2010-09-29 17:19 ` Roland Dreier
[not found] ` <adawrq431sr.fsf-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org>
2010-09-29 17:27 ` Steve Wise
2010-09-29 17:27 ` Steve Wise
2010-09-29 17:41 ` Roland Dreier
2010-09-29 17:49 ` Steve Wise
2010-09-29 17:50 ` Roland Dreier
2010-09-29 19:17 ` Arnd Bergmann
2010-09-29 19:17 ` Arnd Bergmann
[not found] ` <201009292117.54828.arnd-r2nGTMty4D4@public.gmane.org>
2010-09-29 19:21 ` Roland Dreier
2010-09-29 19:21 ` Roland Dreier
2010-09-29 19:29 ` Arnd Bergmann [this message]
2010-09-29 19:40 ` Roland Dreier
2010-09-29 18:52 ` Roland Dreier
2010-09-29 18:52 ` Roland Dreier
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=201009292129.31415.arnd@arndb.de \
--to=arnd@arndb.de \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-next@vger.kernel.org \
--cc=linux-rdma@vger.kernel.org \
--cc=rdreier@cisco.com \
--cc=swise@opengridcomputing.com \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.