linux-ext4 - [PATCH 04/15] ext4: Use pagevec_lookup_range

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Date:   Thu, 14 Sep 2017 15:18:08 +0200
From:   Jan Kara <jack@...e.cz>
To:     <linux-mm@...ck.org>
Cc:     <linux-fsdevel@...r.kernel.org>,
        linux-f2fs-devel@...ts.sourceforge.net,
        Jaegeuk Kim <jaegeuk@...nel.org>, ceph-devel@...r.kernel.org,
        "Yan, Zheng" <zyan@...hat.com>, Ilya Dryomov <idryomov@...il.com>,
        Jan Kara <jack@...e.cz>, "Theodore Ts'o" <tytso@....edu>,
        linux-ext4@...r.kernel.org
Subject: [PATCH 04/15] ext4: Use pagevec_lookup_range_tag()

We want only pages from given range in ext4_writepages(). Use
pagevec_lookup_range_tag() instead of pagevec_lookup_tag() and remove
unnecessary code.

CC: "Theodore Ts'o" <tytso@....edu>
CC: linux-ext4@...r.kernel.org
Signed-off-by: Jan Kara <jack@...e.cz>
---
 fs/ext4/inode.c | 14 ++------------
 1 file changed, 2 insertions(+), 12 deletions(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 31db875bc7a1..69f11233d0d6 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2619,8 +2619,8 @@ static int mpage_prepare_extent_to_map(struct mpage_da_data *mpd)
 	mpd->map.m_len = 0;
 	mpd->next_page = index;
 	while (index <= end) {
-		nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag,
-			      min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1);
+		nr_pages = pagevec_lookup_range_tag(&pvec, mapping, &index, end,
+				tag, PAGEVEC_SIZE);
 		if (nr_pages == 0)
 			goto out;
 
@@ -2628,16 +2628,6 @@ static int mpage_prepare_extent_to_map(struct mpage_da_data *mpd)
 			struct page *page = pvec.pages[i];
 
 			/*
-			 * At this point, the page may be truncated or
-			 * invalidated (changing page->mapping to NULL), or
-			 * even swizzled back from swapper_space to tmpfs file
-			 * mapping. However, page->index will not change
-			 * because we have a reference on the page.
-			 */
-			if (page->index > end)
-				goto out;
-
-			/*
 			 * Accumulated enough dirty pages? This doesn't apply
 			 * to WB_SYNC_ALL mode. For integrity sync we have to
 			 * keep going because someone may be concurrently
-- 
2.12.3