iomap: rename IOMAP_DIO_DIRTY to IOMAP_DIO_USER_BACKED

Match the more descriptive iov_iter terminology instead of encoding
what we do with them for reads only.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Tested-by: Anuj Gupta <anuj20.g@samsung.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: Christoph Hellwig

fs/iomap/direct-io.c

@@ -22,7 +22,7 @@
 #define IOMAP_DIO_WRITE_THROUGH	(1U << 28)
 #define IOMAP_DIO_NEED_SYNC	(1U << 29)
 #define IOMAP_DIO_WRITE		(1U << 30)
-#define IOMAP_DIO_DIRTY		(1U << 31)
+#define IOMAP_DIO_USER_BACKED	(1U << 31)
 
 struct iomap_dio {
 	struct kiocb		*iocb;
@@ -215,7 +215,7 @@ static void __iomap_dio_bio_end_io(struct bio *bio, bool inline_completion)
 {
 	struct iomap_dio *dio = bio->bi_private;
 
-	if (dio->flags & IOMAP_DIO_DIRTY) {
+	if (dio->flags & IOMAP_DIO_USER_BACKED) {
 		bio_check_pages_dirty(bio);
 	} else {
 		bio_release_pages(bio, false);
@@ -333,7 +333,7 @@ static ssize_t iomap_dio_bio_iter_one(struct iomap_iter *iter,
 
 	if (dio->flags & IOMAP_DIO_WRITE)
 		task_io_account_write(ret);
-	else if (dio->flags & IOMAP_DIO_DIRTY)
+	else if (dio->flags & IOMAP_DIO_USER_BACKED)
 		bio_set_pages_dirty(bio);
 
 	/*
@@ -679,7 +679,7 @@ __iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
 			goto out_free_dio;
 
 		if (user_backed_iter(iter))
-			dio->flags |= IOMAP_DIO_DIRTY;
+			dio->flags |= IOMAP_DIO_USER_BACKED;
 
 		ret = kiocb_write_and_wait(iocb, iomi.len);
 		if (ret)