linux-kernel - [PATCH 14/26] nfs: Convert direct IO to use get_user_pages

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Date:	Wed,  2 Oct 2013 16:27:55 +0200
From:	Jan Kara <jack@...e.cz>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	linux-mm@...ck.org, Jan Kara <jack@...e.cz>,
	Trond Myklebust <Trond.Myklebust@...app.com>,
	linux-nfs@...r.kernel.org
Subject: [PATCH 14/26] nfs: Convert direct IO to use get_user_pages_fast()

CC: Trond Myklebust <Trond.Myklebust@...app.com>
CC: linux-nfs@...r.kernel.org
Signed-off-by: Jan Kara <jack@...e.cz>
---
 fs/nfs/direct.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index 91ff089d3412..1aaf4aa2b3d7 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -337,10 +337,8 @@ static ssize_t nfs_direct_read_schedule_segment(struct nfs_pageio_descriptor *de
 		if (!pagevec)
 			break;
 		if (uio) {
-			down_read(&current->mm->mmap_sem);
-			result = get_user_pages(current, current->mm, user_addr,
-					npages, 1, 0, pagevec, NULL);
-			up_read(&current->mm->mmap_sem);
+			result = get_user_pages_fast(user_addr, npages, 1,
+						     pagevec);
 			if (result < 0)
 				break;
 		} else {
@@ -658,10 +656,8 @@ static ssize_t nfs_direct_write_schedule_segment(struct nfs_pageio_descriptor *d
 			break;
 
 		if (uio) {
-			down_read(&current->mm->mmap_sem);
-			result = get_user_pages(current, current->mm, user_addr,
-						npages, 0, 0, pagevec, NULL);
-			up_read(&current->mm->mmap_sem);
+			result = get_user_pages_fast(user_addr, npages, 0,
+						     pagevec);
 			if (result < 0)
 				break;
 		} else {
-- 
1.8.1.4

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