f2fs: use f2fs_filemap_get_folio() instead of f2fs_pagecache_get_page()

Let's use f2fs_filemap_get_folio() instead of f2fs_pagecache_get_page() in
ra_data_block() and move_data_block(), then remove f2fs_pagecache_get_page()
since it has no user.

Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

Author: chaseyu

fs/f2fs/f2fs.h

@@ -2961,16 +2961,6 @@ static inline struct folio *f2fs_filemap_get_folio(
 	return __filemap_get_folio(mapping, index, fgp_flags, gfp_mask);
 }
 
-static inline struct page *f2fs_pagecache_get_page(
-				struct address_space *mapping, pgoff_t index,
-				fgf_t fgp_flags, gfp_t gfp_mask)
-{
-	if (time_to_inject(F2FS_M_SB(mapping), FAULT_PAGE_GET))
-		return NULL;
-
-	return pagecache_get_page(mapping, index, fgp_flags, gfp_mask);
-}
-
 static inline void f2fs_folio_put(struct folio *folio, bool unlock)
 {
 	if (IS_ERR_OR_NULL(folio))

fs/f2fs/gc.c

@@ -1211,7 +1211,7 @@ static int ra_data_block(struct inode *inode, pgoff_t index)
 	struct address_space *mapping = f2fs_is_cow_file(inode) ?
 				F2FS_I(inode)->atomic_inode->i_mapping : inode->i_mapping;
 	struct dnode_of_data dn;
-	struct folio *folio;
+	struct folio *folio, *efolio;
 	struct f2fs_io_info fio = {
 		.sbi = sbi,
 		.ino = inode->i_ino,
@@ -1266,14 +1266,15 @@ static int ra_data_block(struct inode *inode, pgoff_t index)
 
 	f2fs_wait_on_block_writeback(inode, dn.data_blkaddr);
 
-	fio.encrypted_page = f2fs_pagecache_get_page(META_MAPPING(sbi),
-					dn.data_blkaddr,
+	efolio = f2fs_filemap_get_folio(META_MAPPING(sbi), dn.data_blkaddr,
 					FGP_LOCK | FGP_CREAT, GFP_NOFS);
-	if (!fio.encrypted_page) {
-		err = -ENOMEM;
+	if (IS_ERR(efolio)) {
+		err = PTR_ERR(efolio);
 		goto put_folio;
 	}
 
+	fio.encrypted_page = &efolio->page;
+
 	err = f2fs_submit_page_bio(&fio);
 	if (err)
 		goto put_encrypted_page;
@@ -1313,7 +1314,7 @@ static int move_data_block(struct inode *inode, block_t bidx,
 	struct dnode_of_data dn;
 	struct f2fs_summary sum;
 	struct node_info ni;
-	struct folio *folio, *mfolio;
+	struct folio *folio, *mfolio, *efolio;
 	block_t newaddr;
 	int err = 0;
 	bool lfs_mode = f2fs_lfs_mode(fio.sbi);
@@ -1407,14 +1408,16 @@ static int move_data_block(struct inode *inode, block_t bidx,
 		goto up_out;
 	}
 
-	fio.encrypted_page = f2fs_pagecache_get_page(META_MAPPING(fio.sbi),
-				newaddr, FGP_LOCK | FGP_CREAT, GFP_NOFS);
-	if (!fio.encrypted_page) {
-		err = -ENOMEM;
+	efolio = f2fs_filemap_get_folio(META_MAPPING(fio.sbi), newaddr,
+					FGP_LOCK | FGP_CREAT, GFP_NOFS);
+	if (IS_ERR(efolio)) {
+		err = PTR_ERR(efolio);
 		f2fs_folio_put(mfolio, true);
 		goto recover_block;
 	}
 
+	fio.encrypted_page = &efolio->page;
+
 	/* write target block */
 	f2fs_wait_on_page_writeback(fio.encrypted_page, DATA, true, true);
 	memcpy(page_address(fio.encrypted_page),