nilfs2: convert inode file to be folio-based

Convert the page-based implementation of ifile, a metadata file that
manages inodes, to folio-based.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Ryusuke Konishi <[email protected]>
Cc: Matthew Wilcox (Oracle) <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: konis

fs/nilfs2/ifile.c

@@ -98,7 +98,7 @@ int nilfs_ifile_delete_inode(struct inode *ifile, ino_t ino)
 		.pr_entry_nr = ino, .pr_entry_bh = NULL
 	};
 	struct nilfs_inode *raw_inode;
-	void *kaddr;
+	size_t offset;
 	int ret;
 
 	ret = nilfs_palloc_prepare_free_entry(ifile, &req);
@@ -113,11 +113,11 @@ int nilfs_ifile_delete_inode(struct inode *ifile, ino_t ino)
 		return ret;
 	}
 
-	kaddr = kmap_local_page(req.pr_entry_bh->b_page);
-	raw_inode = nilfs_palloc_block_get_entry(ifile, req.pr_entry_nr,
-						 req.pr_entry_bh, kaddr);
+	offset = nilfs_palloc_entry_offset(ifile, req.pr_entry_nr,
+					   req.pr_entry_bh);
+	raw_inode = kmap_local_folio(req.pr_entry_bh->b_folio, offset);
 	raw_inode->i_flags = 0;
-	kunmap_local(kaddr);
+	kunmap_local(raw_inode);
 
 	mark_buffer_dirty(req.pr_entry_bh);
 	brelse(req.pr_entry_bh);

fs/nilfs2/ifile.h

@@ -21,9 +21,9 @@
 static inline struct nilfs_inode *
 nilfs_ifile_map_inode(struct inode *ifile, ino_t ino, struct buffer_head *ibh)
 {
-	void *kaddr = kmap_local_page(ibh->b_page);
+	size_t __offset_in_folio = nilfs_palloc_entry_offset(ifile, ino, ibh);
 
-	return nilfs_palloc_block_get_entry(ifile, ino, ibh, kaddr);
+	return kmap_local_folio(ibh->b_folio, __offset_in_folio);
 }
 
 static inline void nilfs_ifile_unmap_inode(struct nilfs_inode *raw_inode)