linux-ext4 - [PATCH 12/35] xfs: Use pagevec_lookup_range() in xfs_find_get_desired

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Date:   Thu,  1 Jun 2017 11:32:22 +0200
From:   Jan Kara <jack@...e.cz>
To:     <linux-mm@...ck.org>
Cc:     Hugh Dickins <hughd@...gle.com>,
        David Howells <dhowells@...hat.com>,
        linux-afs@...ts.infradead.org,
        Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>,
        linux-nilfs@...r.kernel.org, Bob Peterson <rpeterso@...hat.com>,
        cluster-devel@...hat.com, Jaegeuk Kim <jaegeuk@...nel.org>,
        linux-f2fs-devel@...ts.sourceforge.net, tytso@....edu,
        linux-ext4@...r.kernel.org, Ilya Dryomov <idryomov@...il.com>,
        "Yan, Zheng" <zyan@...hat.com>, ceph-devel@...r.kernel.org,
        linux-btrfs@...r.kernel.org, David Sterba <dsterba@...e.com>,
        "Darrick J . Wong" <darrick.wong@...cle.com>,
        linux-xfs@...r.kernel.org,
        Nadia Yvette Chambers <nyc@...omorphy.com>,
        Jan Kara <jack@...e.cz>
Subject: [PATCH 12/35] xfs: Use pagevec_lookup_range() in xfs_find_get_desired_pgoff()

We want only pages from given range in xfs_find_get_desired_pgoff(). Use
pagevec_lookup_range() instead of pagevec_lookup() and remove
unnecessary code. Note that the check for getting less pages than
desired can be removed because index gets updated by
pagevec_lookup_range().

CC: Darrick J. Wong <darrick.wong@...cle.com>
CC: linux-xfs@...r.kernel.org
Signed-off-by: Jan Kara <jack@...e.cz>
---
 fs/xfs/xfs_file.c | 16 ++--------------
 1 file changed, 2 insertions(+), 14 deletions(-)

diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 487342078fc7..f9343dac7ff9 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -1045,13 +1045,11 @@ xfs_find_get_desired_pgoff(
 	endoff = XFS_FSB_TO_B(mp, map->br_startoff + map->br_blockcount);
 	end = (endoff - 1) >> PAGE_SHIFT;
 	do {
-		int		want;
 		unsigned	nr_pages;
 		unsigned int	i;
 
-		want = min_t(pgoff_t, end - index, PAGEVEC_SIZE - 1) + 1;
-		nr_pages = pagevec_lookup(&pvec, inode->i_mapping, &index,
-					  want);
+		nr_pages = pagevec_lookup_range(&pvec, inode->i_mapping,
+						&index, end, PAGEVEC_SIZE);
 		if (nr_pages == 0)
 			break;
 
@@ -1075,9 +1073,6 @@ xfs_find_get_desired_pgoff(
 				*offset = lastoff;
 				goto out;
 			}
-			/* Searching done if the page index is out of range. */
-			if (page->index > end)
-				goto out;
 
 			lock_page(page);
 			/*
@@ -1117,13 +1112,6 @@ xfs_find_get_desired_pgoff(
 			unlock_page(page);
 		}
 
-		/*
-		 * The number of returned pages less than our desired, search
-		 * done.
-		 */
-		if (nr_pages < want)
-			break;
-
 		pagevec_release(&pvec);
 	} while (index <= end);
 
-- 
2.12.3