Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755645Ab2B0VX3 (ORCPT ); Mon, 27 Feb 2012 16:23:29 -0500 Received: from acsinet15.oracle.com ([141.146.126.227]:33622 "EHLO acsinet15.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755289Ab2B0VUY (ORCPT ); Mon, 27 Feb 2012 16:20:24 -0500 From: Dave Kleikamp To: linux-fsdevel@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Zach Brown , Dave Kleikamp Subject: [RFC PATCH 07/22] iov_iter: let callers extract iovecs and bio_vecs Date: Mon, 27 Feb 2012 15:19:21 -0600 Message-Id: <1330377576-3659-8-git-send-email-dave.kleikamp@oracle.com> X-Mailer: git-send-email 1.7.9.2 In-Reply-To: <1330377576-3659-1-git-send-email-dave.kleikamp@oracle.com> References: <1330377576-3659-1-git-send-email-dave.kleikamp@oracle.com> X-Source-IP: acsinet22.oracle.com [141.146.126.238] X-Auth-Type: Internal IP X-CT-RefId: str=0001.0A090203.4F4BF398.0075,ss=1,re=0.000,fgs=0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1797 Lines: 61 From: Zach Brown direct IO treats memory from user iovecs and memory from arrays of kernel pages very differently. User memory is pinned and worked with in batches while kernel pages are always pinned and don't require additional processing. Rather than try and provide an absctraction that includes these different behaviours we let direct IO extract the memory structs and hand them to the existing code. Signed-off-by: Dave Kleikamp Cc: Zach Brown --- include/linux/fs.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/include/linux/fs.h b/include/linux/fs.h index 101afc1..4750933 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -604,6 +604,15 @@ static inline void iov_iter_init_bvec(struct iov_iter *i, iov_iter_advance(i, written); } +static inline int iov_iter_has_bvec(struct iov_iter *i) +{ + return i->ops == &ii_bvec_ops; +} +static inline struct bio_vec *iov_iter_bvec(struct iov_iter *i) +{ + BUG_ON(!iov_iter_has_bvec(i)); + return (struct bio_vec *)i->data; +} extern struct iov_iter_ops ii_iovec_ops; @@ -619,6 +628,15 @@ static inline void iov_iter_init(struct iov_iter *i, iov_iter_advance(i, written); } +static inline int iov_iter_has_iovec(struct iov_iter *i) +{ + return i->ops == &ii_iovec_ops; +} +static inline struct iovec *iov_iter_iovec(struct iov_iter *i) +{ + BUG_ON(!iov_iter_has_iovec(i)); + return (struct iovec *)i->data; +} static inline size_t iov_iter_count(struct iov_iter *i) { -- 1.7.9.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/