ext4: move ->read_folio and ->readahead to readpage.c

Keep all the read into pagecache code in a single file.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Acked-by: Theodore Ts'o <tytso@mit.edu>
Link: https://lore.kernel.org/r/20260202060754.270269-4-hch@lst.de
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

3 files changed, 31 insertions, 30 deletions

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 56112f201cac..a8a448e20ef8 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -3735,8 +3735,8 @@ static inline void ext4_set_de_type(struct super_block *sb,
 }
 
 /* readpages.c */
-extern int ext4_mpage_readpages(struct inode *inode,
-		struct readahead_control *rac, struct folio *folio);
+int ext4_read_folio(struct file *file, struct folio *folio);
+void ext4_readahead(struct readahead_control *rac);
 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 8c2ef98fa530..e98954e7d0b3 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3380,33 +3380,6 @@ out:
 	return ret;
 }
 
-static int ext4_read_folio(struct file *file, struct folio *folio)
-{
-	int ret = -EAGAIN;
-	struct inode *inode = folio->mapping->host;
-
-	trace_ext4_read_folio(inode, folio);
-
-	if (ext4_has_inline_data(inode))
-		ret = ext4_readpage_inline(inode, folio);
-
-	if (ret == -EAGAIN)
-		return ext4_mpage_readpages(inode, NULL, folio);
-
-	return ret;
-}
-
-static void ext4_readahead(struct readahead_control *rac)
-{
-	struct inode *inode = rac->mapping->host;
-
-	/* If the file has inline data, no need to do readahead. */
-	if (ext4_has_inline_data(inode))
-		return;
-
-	ext4_mpage_readpages(inode, rac, NULL);
-}
-
 static void ext4_invalidate_folio(struct folio *folio, size_t offset,
 				size_t length)
 {
diff --git a/fs/ext4/readpage.c b/fs/ext4/readpage.c
index 267594ef0b2c..5a7774f089e8 100644
--- a/fs/ext4/readpage.c
+++ b/fs/ext4/readpage.c
@@ -45,6 +45,7 @@
 #include <linux/pagevec.h>
 
 #include "ext4.h"
+#include <trace/events/ext4.h>
 
 #define NUM_PREALLOC_POST_READ_CTXS	128
 
@@ -209,7 +210,7 @@ static inline loff_t ext4_readpage_limit(struct inode *inode)
 	return i_size_read(inode);
 }
 
-int ext4_mpage_readpages(struct inode *inode,
+static int ext4_mpage_readpages(struct inode *inode,
 		struct readahead_control *rac, struct folio *folio)
 {
 	struct bio *bio = NULL;
@@ -394,6 +395,33 @@ next_page:
 	return 0;
 }
 
+int ext4_read_folio(struct file *file, struct folio *folio)
+{
+	int ret = -EAGAIN;
+	struct inode *inode = folio->mapping->host;
+
+	trace_ext4_read_folio(inode, folio);
+
+	if (ext4_has_inline_data(inode))
+		ret = ext4_readpage_inline(inode, folio);
+
+	if (ret == -EAGAIN)
+		return ext4_mpage_readpages(inode, NULL, folio);
+
+	return ret;
+}
+
+void ext4_readahead(struct readahead_control *rac)
+{
+	struct inode *inode = rac->mapping->host;
+
+	/* If the file has inline data, no need to do readahead. */
+	if (ext4_has_inline_data(inode))
+		return;
+
+	ext4_mpage_readpages(inode, rac, NULL);
+}
+
 int __init ext4_init_post_read_processing(void)
 {
 	bio_post_read_ctx_cache = KMEM_CACHE(bio_post_read_ctx, SLAB_RECLAIM_ACCOUNT);