linux-ext4 - [PATCH 31/35] shmem: Convert to pagevec_lookup_entries

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Message-Id: <20170601093245.29238-32-jack@suse.cz>
Date:   Thu,  1 Jun 2017 11:32:41 +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 31/35] shmem: Convert to pagevec_lookup_entries_range()

Convert radix tree scanners to use pagevec_lookup_entries_range() and
find_get_entries_range() since they all want only entries from given
range.

CC: Hugh Dickins <hughd@...gle.com>
Signed-off-by: Jan Kara <jack@...e.cz>
---
 mm/shmem.c | 23 +++++++----------------
 1 file changed, 7 insertions(+), 16 deletions(-)

diff --git a/mm/shmem.c b/mm/shmem.c
index f9c4afbdd70c..e5ea044aae24 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -768,16 +768,12 @@ static void shmem_undo_range(struct inode *inode, loff_t lstart, loff_t lend,
 	pagevec_init(&pvec, 0);
 	index = start;
 	while (index < end) {
-		if (!pagevec_lookup_entries(&pvec, mapping, &index,
-				min(end - index, (pgoff_t)PAGEVEC_SIZE),
-				indices))
+		if (!pagevec_lookup_entries_range(&pvec, mapping, &index,
+				end - 1, PAGEVEC_SIZE, indices))
 			break;
 		for (i = 0; i < pagevec_count(&pvec); i++) {
 			struct page *page = pvec.pages[i];
 
-			if (indices[i] >= end)
-				break;
-
 			if (radix_tree_exceptional_entry(page)) {
 				if (unfalloc)
 					continue;
@@ -860,9 +856,8 @@ static void shmem_undo_range(struct inode *inode, loff_t lstart, loff_t lend,
 
 		cond_resched();
 
-		if (!pagevec_lookup_entries(&pvec, mapping, &index,
-				min(end - index, (pgoff_t)PAGEVEC_SIZE),
-				indices)) {
+		if (!pagevec_lookup_entries_range(&pvec, mapping, &index,
+				end - 1, PAGEVEC_SIZE, indices)) {
 			/* If all gone or hole-punch or unfalloc, we're done */
 			if (lookup_start == start || end != -1)
 				break;
@@ -873,9 +868,6 @@ static void shmem_undo_range(struct inode *inode, loff_t lstart, loff_t lend,
 		for (i = 0; i < pagevec_count(&pvec); i++) {
 			struct page *page = pvec.pages[i];
 
-			if (indices[i] >= end)
-				break;
-
 			if (radix_tree_exceptional_entry(page)) {
 				if (unfalloc)
 					continue;
@@ -2494,9 +2486,9 @@ static pgoff_t shmem_seek_hole_data(struct address_space *mapping,
 
 	pagevec_init(&pvec, 0);
 	pvec.nr = 1;		/* start small: we may be there already */
-	while (!done) {
+	while (!done && index < end) {
 		last = index;
-		pvec.nr = find_get_entries(mapping, &index,
+		pvec.nr = find_get_entries_range(mapping, &index, end - 1,
 					pvec.nr, pvec.pages, indices);
 		if (!pvec.nr) {
 			if (whence == SEEK_DATA)
@@ -2516,8 +2508,7 @@ static pgoff_t shmem_seek_hole_data(struct address_space *mapping,
 				if (!PageUptodate(page))
 					page = NULL;
 			}
-			if (last >= end ||
-			    (page && whence == SEEK_DATA) ||
+			if ((page && whence == SEEK_DATA) ||
 			    (!page && whence == SEEK_HOLE)) {
 				done = true;
 				break;
-- 
2.12.3