From: David Sterba <dsterba@suse.cz>
To: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Omar Sandoval <osandov@osandov.com>,
linux-fsdevel@vger.kernel.org, linux-btrfs@vger.kernel.org,
ceph-devel@vger.kernel.org, linux-cifs@vger.kernel.org,
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v9fs-developer@lists.sourceforge.net, xfs@oss.sgi.com,
linux-kernel@vger.kernel.org, Chris Mason <clm@fb.com>,
Josef Bacik <jbacik@fb.com>, David Sterba <dsterba@suse.cz>,
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Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>,
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Ron Minnich <rminnich@sandia.gov>,
Latchesar Ionkov <lucho@ionkov.net>,
Dave Chinner <david@fromorbit.com>
Subject: Re: [RFC PATCH 1/5] new helper: iov_iter_rw()
Date: Tue, 17 Mar 2015 10:31:51 +0100 [thread overview]
Message-ID: <20150317093151.GS20767@twin.jikos.cz> (raw)
In-Reply-To: <20150316173605.GX29656@ZenIV.linux.org.uk>
On Mon, Mar 16, 2015 at 05:36:05PM +0000, Al Viro wrote:
> On Mon, Mar 16, 2015 at 04:33:49AM -0700, Omar Sandoval wrote:
> > Get either READ or WRITE out of iter->type.
>
> Umm...
>
> > + * Get one of READ or WRITE out of iter->type without any other flags OR'd in
> > + * with it.
> > + */
> > +static inline int iov_iter_rw(const struct iov_iter *i)
> > +{
> > + return i->type & RW_MASK;
> > +}
>
> TBH, I would turn that into a macro. Reason: indirect includes.
Agreed, but the proposed define is rather cryptic and I was not able to
understand the meaning on the first glance.
> #define iov_iter_rw(i) ((0 ? (struct iov_iter *)0 : (i))->type & RW_MASK)
This worked for me, does not compile with anything else than
'struct iov_iter*' as i:
#define iov_iter_rw(i) ({ \
struct iov_iter __iter = *(i); \
(i)->type & RW_MASK; \
})
The assignment is optimized out.
next prev parent reply other threads:[~2015-03-17 9:32 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-16 11:33 [RFC PATCH 0/5] Remove rw parameter from direct_IO() Omar Sandoval
2015-03-16 11:33 ` [RFC PATCH 1/5] new helper: iov_iter_rw() Omar Sandoval
2015-03-16 17:36 ` Al Viro
2015-03-17 1:20 ` [RFC PATCH v2 " Omar Sandoval
2015-03-17 9:31 ` David Sterba [this message]
2015-03-17 10:18 ` [RFC PATCH " Omar Sandoval
2015-03-17 18:19 ` Al Viro
2015-03-17 21:04 ` [RFC PATCH v3 " Omar Sandoval
2015-03-18 13:42 ` David Sterba
2015-03-16 11:33 ` [RFC PATCH 2/5] Remove rw from {,__,do_}blockdev_direct_IO() Omar Sandoval
2015-03-16 11:33 ` [RFC PATCH 3/5] Remove rw from dax_{do_,}io() Omar Sandoval
2015-03-16 11:33 ` [RFC PATCH 4/5] direct_IO: use iov_iter_rw() instead of rw everywhere Omar Sandoval
2015-03-16 11:33 ` [RFC PATCH 5/5] direct_IO: remove rw from a_ops->direct_IO() Omar Sandoval
2015-03-16 18:15 ` [RFC PATCH 0/5] Remove rw parameter from direct_IO() Al Viro
2015-04-05 16:27 ` Al Viro
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