ocfs2: use a folio in ocfs2_fast_symlink_read_folio()

Use folio_end_read() instead of SetPageUptodate() and unlock_page(). Use
memcpy_to_folio() instead of open-coding a kmap_atomic() sequence.

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Matthew Wilcox (Oracle) <[e-mail]>
Reviewed-by: Joseph Qi <[e-mail]>
Cc: Changwei Ge <[e-mail]>
Cc: Joel Becker <[e-mail]>
Cc: Jun Piao <[e-mail]>
Cc: Junxiao Bi <[e-mail]>
Cc: Mark Fasheh <[e-mail]>
Cc: Mark Tinguely <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

fs/ocfs2/symlink.c

···
 
 static int ocfs2_fast_symlink_read_folio(struct file *f, struct folio *folio)
 {
-	struct page *page = &folio->page;
-	struct inode *inode = page->mapping->host;
+	struct inode *inode = folio->mapping->host;
 	struct buffer_head *bh = NULL;
 	int status = ocfs2_read_inode_block(inode, &bh);
 	struct ocfs2_dinode *fe;
 	const char *link;
-	void *kaddr;
 	size_t len;
 
 	if (status < 0) {
···
 	link = (char *) fe->id2.i_symlink;
 	/* will be less than a page size */
 	len = strnlen(link, ocfs2_fast_symlink_chars(inode->i_sb));
-	kaddr = kmap_atomic(page);
-	memcpy(kaddr, link, len + 1);
-	kunmap_atomic(kaddr);
-	SetPageUptodate(page);
+	memcpy_to_folio(folio, 0, link, len + 1);
 out:
-	unlock_page(page);
+	folio_end_read(folio, status == 0);
 	brelse(bh);
 	return status;
 }