linux-kernel - [PATCH v2 4/6] swap: Use bdev_read_page() / bdev_write

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Message-Id: <67a4f1fde869717a22bd22724b6449e6343406ba.1395593198.git.matthew.r.wilcox@intel.com>
Date:	Sun, 23 Mar 2014 15:08:26 -0400
From:	Matthew Wilcox <matthew.r.wilcox@...el.com>
To:	linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Cc:	Matthew Wilcox <matthew.r.wilcox@...el.com>, willy@...ux.intel.com
Subject: [PATCH v2 4/6] swap: Use bdev_read_page() / bdev_write_page()

Signed-off-by: Matthew Wilcox <matthew.r.wilcox@...el.com>
---
 mm/page_io.c | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/mm/page_io.c b/mm/page_io.c
index 7c59ef6..43d7220 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -248,11 +248,16 @@ out:
 	return ret;
 }
 
+static sector_t swap_page_sector(struct page *page)
+{
+	return (sector_t)__page_file_index(page) << (PAGE_CACHE_SHIFT - 9);
+}
+
 int __swap_writepage(struct page *page, struct writeback_control *wbc,
 	void (*end_write_func)(struct bio *, int))
 {
 	struct bio *bio;
-	int ret = 0, rw = WRITE;
+	int ret, rw = WRITE;
 	struct swap_info_struct *sis = page_swap_info(page);
 
 	if (sis->flags & SWP_FILE) {
@@ -297,6 +302,13 @@ int __swap_writepage(struct page *page, struct writeback_control *wbc,
 		return ret;
 	}
 
+	ret = bdev_write_page(sis->bdev, swap_page_sector(page), page, wbc);
+	if (!ret) {
+		count_vm_event(PSWPOUT);
+		return 0;
+	}
+
+	ret = 0;
 	bio = get_swap_bio(GFP_NOIO, page, end_write_func);
 	if (bio == NULL) {
 		set_page_dirty(page);
@@ -317,7 +329,7 @@ out:
 int swap_readpage(struct page *page)
 {
 	struct bio *bio;
-	int ret = 0;
+	int ret;
 	struct swap_info_struct *sis = page_swap_info(page);
 
 	VM_BUG_ON_PAGE(!PageLocked(page), page);
@@ -338,6 +350,13 @@ int swap_readpage(struct page *page)
 		return ret;
 	}
 
+	ret = bdev_read_page(sis->bdev, swap_page_sector(page), page);
+	if (!ret) {
+		count_vm_event(PSWPIN);
+		return 0;
+	}
+
+	ret = 0;
 	bio = get_swap_bio(GFP_KERNEL, page, end_swap_bio_read);
 	if (bio == NULL) {
 		unlock_page(page);
-- 
1.9.0

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