linux-kernel - [PATCH v9 21/25] ext4: Pass the inode to ext4_mpage

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Date:   Fri, 20 Mar 2020 07:22:27 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-btrfs@...r.kernel.org,
        linux-erofs@...ts.ozlabs.org, linux-ext4@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, cluster-devel@...hat.com,
        ocfs2-devel@....oracle.com, linux-xfs@...r.kernel.org,
        William Kucharski <william.kucharski@...cle.com>
Subject: [PATCH v9 21/25] ext4: Pass the inode to ext4_mpage_readpages

From: "Matthew Wilcox (Oracle)" <willy@...radead.org>

This function now only uses the mapping argument to look up the inode,
and both callers already have the inode, so just pass the inode instead
of the mapping.

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
Reviewed-by: William Kucharski <william.kucharski@...cle.com>
---
 fs/ext4/ext4.h     | 2 +-
 fs/ext4/inode.c    | 4 ++--
 fs/ext4/readpage.c | 3 +--
 3 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 1570a0b51b73..bc1b34ba6eab 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -3278,7 +3278,7 @@ static inline void ext4_set_de_type(struct super_block *sb,
 }
 
 /* readpages.c */
-extern int ext4_mpage_readpages(struct address_space *mapping,
+extern int ext4_mpage_readpages(struct inode *inode,
 		struct readahead_control *rac, struct page *page);
 extern int __init ext4_init_post_read_processing(void);
 extern void ext4_exit_post_read_processing(void);
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index d674c5f9066c..4f3703c1408d 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3226,7 +3226,7 @@ static int ext4_readpage(struct file *file, struct page *page)
 		ret = ext4_readpage_inline(inode, page);
 
 	if (ret == -EAGAIN)
-		return ext4_mpage_readpages(page->mapping, NULL, page);
+		return ext4_mpage_readpages(inode, NULL, page);
 
 	return ret;
 }
@@ -3239,7 +3239,7 @@ static void ext4_readahead(struct readahead_control *rac)
 	if (ext4_has_inline_data(inode))
 		return;
 
-	ext4_mpage_readpages(rac->mapping, rac, NULL);
+	ext4_mpage_readpages(inode, rac, NULL);
 }
 
 static void ext4_invalidatepage(struct page *page, unsigned int offset,
diff --git a/fs/ext4/readpage.c b/fs/ext4/readpage.c
index 66275f25235d..5761e9961682 100644
--- a/fs/ext4/readpage.c
+++ b/fs/ext4/readpage.c
@@ -221,13 +221,12 @@ static inline loff_t ext4_readpage_limit(struct inode *inode)
 	return i_size_read(inode);
 }
 
-int ext4_mpage_readpages(struct address_space *mapping,
+int ext4_mpage_readpages(struct inode *inode,
 		struct readahead_control *rac, struct page *page)
 {
 	struct bio *bio = NULL;
 	sector_t last_block_in_bio = 0;
 
-	struct inode *inode = mapping->host;
 	const unsigned blkbits = inode->i_blkbits;
 	const unsigned blocks_per_page = PAGE_SIZE >> blkbits;
 	const unsigned blocksize = 1 << blkbits;
-- 
2.25.1