[PATCH] ext4,f2fs: Fix readahead of verity data

[PATCH] ext4,f2fs: Fix readahead of verity data

[Matthew Wilcox (Oracle)]

The recent change of page_cache_ra_unbounded() arguments was buggy in
the two callers, causing us to readahead the wrong pages.  Move the
definition of ractl down to after the index is set correctly.  This
affected performance on configurations that use fs-verity.

Fixes: 73bb49da50cd ("mm/readahead: make page_cache_ra_unbounded take a readahead_control")
Reported-by: Jintao Yin <nicememory@gmail.com>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 fs/ext4/verity.c | 3 ++-
 fs/f2fs/verity.c | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/fs/ext4/verity.c b/fs/ext4/verity.c
index 20cadfb740dc..3c640bd7ecae 100644
--- a/fs/ext4/verity.c
+++ b/fs/ext4/verity.c
@@ -363,13 +363,14 @@ static struct page *ext4_read_merkle_tree_page(struct inode *inode,
 					       pgoff_t index,
 					       unsigned long num_ra_pages)
 {
-	DEFINE_READAHEAD(ractl, NULL, NULL, inode->i_mapping, index);
 	struct page *page;
 
 	index += ext4_verity_metadata_pos(inode) >> PAGE_SHIFT;
 
 	page = find_get_page_flags(inode->i_mapping, index, FGP_ACCESSED);
 	if (!page || !PageUptodate(page)) {
+		DEFINE_READAHEAD(ractl, NULL, NULL, inode->i_mapping, index);
+
 		if (page)
 			put_page(page);
 		else if (num_ra_pages > 1)
diff --git a/fs/f2fs/verity.c b/fs/f2fs/verity.c
index f0805e51b3fe..c352fff88a5e 100644
--- a/fs/f2fs/verity.c
+++ b/fs/f2fs/verity.c
@@ -258,13 +258,14 @@ static struct page *f2fs_read_merkle_tree_page(struct inode *inode,
 					       pgoff_t index,
 					       unsigned long num_ra_pages)
 {
-	DEFINE_READAHEAD(ractl, NULL, NULL, inode->i_mapping, index);
 	struct page *page;
 
 	index += f2fs_verity_metadata_pos(inode) >> PAGE_SHIFT;
 
 	page = find_get_page_flags(inode->i_mapping, index, FGP_ACCESSED);
 	if (!page || !PageUptodate(page)) {
+		DEFINE_READAHEAD(ractl, NULL, NULL, inode->i_mapping, index);
+
 		if (page)
 			put_page(page);
 		else if (num_ra_pages > 1)
-- 
2.35.1