linux-kernel - [PATCH v13 136/137] mm/readahead: Convert page_cache_async

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Date:   Mon, 12 Jul 2021 04:07:00 +0100
From:   "Matthew Wilcox (Oracle)" <willy@...radead.org>
To:     linux-kernel@...r.kernel.org
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        linux-mm@...ck.org, linux-fsdevel@...r.kernel.org
Subject: [PATCH v13 136/137] mm/readahead: Convert page_cache_async_ra() to take a folio

This lets us pass the folio in directly from filemap_readahead(), but its
primary reason is to enable us to pass a folio to ondemand_readahead()
in the next patch.

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
 include/linux/pagemap.h | 4 ++--
 mm/filemap.c            | 5 +++--
 mm/readahead.c          | 6 +++---
 3 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 71844b55d0a8..51784f8b9b32 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -955,7 +955,7 @@ struct readahead_control {
 void page_cache_ra_unbounded(struct readahead_control *,
 		unsigned long nr_to_read, unsigned long lookahead_count);
 void page_cache_sync_ra(struct readahead_control *, unsigned long req_count);
-void page_cache_async_ra(struct readahead_control *, struct page *,
+void page_cache_async_ra(struct readahead_control *, struct folio *,
 		unsigned long req_count);
 void readahead_expand(struct readahead_control *ractl,
 		      loff_t new_start, size_t new_len);
@@ -1002,7 +1002,7 @@ void page_cache_async_readahead(struct address_space *mapping,
 		struct page *page, pgoff_t index, unsigned long req_count)
 {
 	DEFINE_READAHEAD(ractl, file, ra, mapping, index);
-	page_cache_async_ra(&ractl, page, req_count);
+	page_cache_async_ra(&ractl, page_folio(page), req_count);
 }
 
 static inline struct folio *__readahead_folio(struct readahead_control *ractl)
diff --git a/mm/filemap.c b/mm/filemap.c
index 57dd01c5060c..2fda11f583a5 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2419,10 +2419,11 @@ static int filemap_readahead(struct kiocb *iocb, struct file *file,
 		struct address_space *mapping, struct folio *folio,
 		pgoff_t last_index)
 {
+	DEFINE_READAHEAD(ractl, file, &file->f_ra, mapping, folio->index);
+
 	if (iocb->ki_flags & IOCB_NOIO)
 		return -EAGAIN;
-	page_cache_async_readahead(mapping, &file->f_ra, file, &folio->page,
-			folio->index, last_index - folio->index);
+	page_cache_async_ra(&ractl, folio, last_index - folio->index);
 	return 0;
 }
 
diff --git a/mm/readahead.c b/mm/readahead.c
index d589f147f4c2..30115a21e304 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -580,7 +580,7 @@ void page_cache_sync_ra(struct readahead_control *ractl,
 EXPORT_SYMBOL_GPL(page_cache_sync_ra);
 
 void page_cache_async_ra(struct readahead_control *ractl,
-		struct page *page, unsigned long req_count)
+		struct folio *folio, unsigned long req_count)
 {
 	/* no read-ahead */
 	if (!ractl->ra->ra_pages)
@@ -589,10 +589,10 @@ void page_cache_async_ra(struct readahead_control *ractl,
 	/*
 	 * Same bit is used for PG_readahead and PG_reclaim.
 	 */
-	if (PageWriteback(page))
+	if (folio_writeback(folio))
 		return;
 
-	ClearPageReadahead(page);
+	folio_clear_readahead_flag(folio);
 
 	/*
 	 * Defer asynchronous read-ahead on IO congestion.
-- 
2.30.2