f2fs: don't check inode's checksum if it was dirtied or writebacked

If another thread already made the page dirtied or writebacked, we must avoid
to verify checksum. If we got an error, we need to remove its uptodate as well.

Reviewed-by: Chao Yu <[e-mail]>
Signed-off-by: Jaegeuk Kim <[e-mail]>

fs/f2fs/inode.c

···
 	struct f2fs_inode *ri;
 	__u32 provided, calculated;
 
-	if (!f2fs_enable_inode_chksum(sbi, page))
+	if (!f2fs_enable_inode_chksum(sbi, page) ||
+			PageDirty(page) || PageWriteback(page))
 		return true;
 
 	ri = &F2FS_NODE(page)->i;

fs/f2fs/node.c

···
 			nid, nid_of_node(page), ino_of_node(page),
 			ofs_of_node(page), cpver_of_node(page),
 			next_blkaddr_of_node(page));
-		ClearPageUptodate(page);
 		err = -EINVAL;
 out_err:
+		ClearPageUptodate(page);
 		f2fs_put_page(page, 1);
 		return ERR_PTR(err);
 	}