diff --git a/block/fops.c b/block/fops.c
index 07f4d7336a76..a1da6d428ca3 100644
--- a/block/fops.c
+++ b/block/fops.c
@@ -714,12 +714,22 @@ blkdev_direct_write(struct kiocb *iocb, struct iov_iter *from)
 
 static ssize_t blkdev_buffered_write(struct kiocb *iocb, struct iov_iter *from)
 {
+	struct inode *inode = bdev_file_inode(iocb->ki_filp);
+	ssize_t ret;
+
 	/* Buffered fallback waits for writeback, which NOWAIT cannot allow. */
 	if (iocb->ki_flags & IOCB_NOWAIT)
 		return -EAGAIN;
 
-	return iomap_file_buffered_write(iocb, from, &blkdev_iomap_ops, NULL,
-			NULL);
+	/*
+	 * Take i_rwsem to avoid racing with set_blocksize() changing
+	 * i_blkbits/folio order and truncating the page cache.
+	 */
+	inode_lock_shared(inode);
+	ret = iomap_file_buffered_write(iocb, from, &blkdev_iomap_ops, NULL,
+					NULL);
+	inode_unlock_shared(inode);
+	return ret;
 }
 
 /*
@@ -808,14 +818,7 @@ static ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from)
 			need_sync = true;
 		}
 	} else {
-		/*
-		 * Take i_rwsem and invalidate_lock to avoid racing with
-		 * set_blocksize changing i_blkbits/folio order and punching
-		 * out the pagecache.
-		 */
-		inode_lock_shared(bd_inode);
 		ret = blkdev_buffered_write(iocb, from);
-		inode_unlock_shared(bd_inode);
 		need_sync = true;
 	}