ufs: Convert ufs_find_entry() to take a folio

This matches ext2 and pushes the use of folios out by one layer.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>

fs/ufs/dir.c

@@ -76,12 +76,12 @@ ino_t ufs_inode_by_name(struct inode *dir, const struct qstr *qstr)
 {
 	ino_t res = 0;
 	struct ufs_dir_entry *de;
-	struct page *page;
+	struct folio *folio;
 	
-	de = ufs_find_entry(dir, qstr, &page);
+	de = ufs_find_entry(dir, qstr, &folio);
 	if (de) {
 		res = fs32_to_cpu(dir->i_sb, de->d_ino);
-		ufs_put_page(page);
+		ufs_put_page(&folio->page);
 	}
 	return res;
 }
@@ -255,7 +255,7 @@ struct ufs_dir_entry *ufs_dotdot(struct inode *dir, struct page **p)
  * Entry is guaranteed to be valid.
  */
 struct ufs_dir_entry *ufs_find_entry(struct inode *dir, const struct qstr *qstr,
-				     struct page **res_page)
+				     struct folio **foliop)
 {
 	struct super_block *sb = dir->i_sb;
 	const unsigned char *name = qstr->name;
@@ -263,7 +263,6 @@ struct ufs_dir_entry *ufs_find_entry(struct inode *dir, const struct qstr *qstr,
 	unsigned reclen = UFS_DIR_REC_LEN(namelen);
 	unsigned long start, n;
 	unsigned long npages = dir_pages(dir);
-	struct folio *folio;
 	struct ufs_inode_info *ui = UFS_I(dir);
 	struct ufs_dir_entry *de;
 
@@ -272,16 +271,13 @@ struct ufs_dir_entry *ufs_find_entry(struct inode *dir, const struct qstr *qstr,
 	if (npages == 0 || namelen > UFS_MAXNAMLEN)
 		goto out;
 
-	/* OFFSET_CACHE */
-	*res_page = NULL;
-
 	start = ui->i_dir_start_lookup;
 
 	if (start >= npages)
 		start = 0;
 	n = start;
 	do {
-		char *kaddr = ufs_get_folio(dir, n, &folio);
+		char *kaddr = ufs_get_folio(dir, n, foliop);
 
 		if (!IS_ERR(kaddr)) {
 			de = (struct ufs_dir_entry *)kaddr;
@@ -291,7 +287,7 @@ struct ufs_dir_entry *ufs_find_entry(struct inode *dir, const struct qstr *qstr,
 					goto found;
 				de = ufs_next_entry(sb, de);
 			}
-			ufs_put_page(&folio->page);
+			ufs_put_page(&(*foliop)->page);
 		}
 		if (++n >= npages)
 			n = 0;
@@ -300,7 +296,6 @@ struct ufs_dir_entry *ufs_find_entry(struct inode *dir, const struct qstr *qstr,
 	return NULL;
 
 found:
-	*res_page = &folio->page;
 	ui->i_dir_start_lookup = n;
 	return de;
 }

fs/ufs/namei.c

@@ -209,14 +209,14 @@ static int ufs_unlink(struct inode *dir, struct dentry *dentry)
 {
 	struct inode * inode = d_inode(dentry);
 	struct ufs_dir_entry *de;
-	struct page *page;
+	struct folio *folio;
 	int err = -ENOENT;
 
-	de = ufs_find_entry(dir, &dentry->d_name, &page);
+	de = ufs_find_entry(dir, &dentry->d_name, &folio);
 	if (!de)
 		goto out;
 
-	err = ufs_delete_entry(dir, de, page);
+	err = ufs_delete_entry(dir, de, &folio->page);
 	if (err)
 		goto out;
 
@@ -251,14 +251,14 @@ static int ufs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 	struct inode *new_inode = d_inode(new_dentry);
 	struct page *dir_page = NULL;
 	struct ufs_dir_entry * dir_de = NULL;
-	struct page *old_page;
+	struct folio *old_folio;
 	struct ufs_dir_entry *old_de;
 	int err = -ENOENT;
 
 	if (flags & ~RENAME_NOREPLACE)
 		return -EINVAL;
 
-	old_de = ufs_find_entry(old_dir, &old_dentry->d_name, &old_page);
+	old_de = ufs_find_entry(old_dir, &old_dentry->d_name, &old_folio);
 	if (!old_de)
 		goto out;
 
@@ -270,7 +270,7 @@ static int ufs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 	}
 
 	if (new_inode) {
-		struct page *new_page;
+		struct folio *new_folio;
 		struct ufs_dir_entry *new_de;
 
 		err = -ENOTEMPTY;
@@ -278,10 +278,10 @@ static int ufs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 			goto out_dir;
 
 		err = -ENOENT;
-		new_de = ufs_find_entry(new_dir, &new_dentry->d_name, &new_page);
+		new_de = ufs_find_entry(new_dir, &new_dentry->d_name, &new_folio);
 		if (!new_de)
 			goto out_dir;
-		ufs_set_link(new_dir, new_de, new_page, old_inode, 1);
+		ufs_set_link(new_dir, new_de, &new_folio->page, old_inode, 1);
 		inode_set_ctime_current(new_inode);
 		if (dir_de)
 			drop_nlink(new_inode);
@@ -300,7 +300,7 @@ static int ufs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 	 */
 	inode_set_ctime_current(old_inode);
 
-	ufs_delete_entry(old_dir, old_de, old_page);
+	ufs_delete_entry(old_dir, old_de, &old_folio->page);
 	mark_inode_dirty(old_inode);
 
 	if (dir_de) {
@@ -321,8 +321,8 @@ static int ufs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 		put_page(dir_page);
 	}
 out_old:
-	kunmap(old_page);
-	put_page(old_page);
+	kunmap(&old_folio->page);
+	folio_put(old_folio);
 out:
 	return err;
 }

fs/ufs/ufs.h

@@ -99,15 +99,17 @@ extern void ufs_put_cylinder (struct super_block *, unsigned);
 
 /* dir.c */
 extern const struct inode_operations ufs_dir_inode_operations;
-extern int ufs_add_link (struct dentry *, struct inode *);
-extern ino_t ufs_inode_by_name(struct inode *, const struct qstr *);
-extern int ufs_make_empty(struct inode *, struct inode *);
-extern struct ufs_dir_entry *ufs_find_entry(struct inode *, const struct qstr *, struct page **);
-extern int ufs_delete_entry(struct inode *, struct ufs_dir_entry *, struct page *);
-extern int ufs_empty_dir (struct inode *);
-extern struct ufs_dir_entry *ufs_dotdot(struct inode *, struct page **);
-extern void ufs_set_link(struct inode *dir, struct ufs_dir_entry *de,
-			 struct page *page, struct inode *inode, bool update_times);
+
+int ufs_add_link(struct dentry *, struct inode *);
+ino_t ufs_inode_by_name(struct inode *, const struct qstr *);
+int ufs_make_empty(struct inode *, struct inode *);
+struct ufs_dir_entry *ufs_find_entry(struct inode *, const struct qstr *,
+		struct folio **);
+int ufs_delete_entry(struct inode *, struct ufs_dir_entry *, struct page *);
+int ufs_empty_dir(struct inode *);
+struct ufs_dir_entry *ufs_dotdot(struct inode *, struct page **);
+void ufs_set_link(struct inode *dir, struct ufs_dir_entry *de,
+		struct page *page, struct inode *inode, bool update_times);
 
 /* file.c */
 extern const struct inode_operations ufs_file_inode_operations;