[PATCH 02/12] iomap: save copy of bdev for direct io

[Keith Busch]

From: Keith Busch <kbusch at kernel.org>

The block_device is used three times already, so save a copy instead of
following the iomap pointer each time.

Signed-off-by: Keith Busch <kbusch at kernel.org>
---
 fs/iomap/direct-io.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c
index 5d098adba443..5d478a95efdf 100644
--- a/fs/iomap/direct-io.c
+++ b/fs/iomap/direct-io.c
@@ -240,7 +240,8 @@ static loff_t iomap_dio_bio_iter(const struct iomap_iter *iter,
 {
 	const struct iomap *iomap = &iter->iomap;
 	struct inode *inode = iter->inode;
-	unsigned int blkbits = blksize_bits(bdev_logical_block_size(iomap->bdev));
+	struct block_device *bdev = iomap->bdev;
+	unsigned int blkbits = blksize_bits(bdev_logical_block_size(bdev));
 	unsigned int fs_block_size = i_blocksize(inode), pad;
 	loff_t length = iomap_length(iter);
 	loff_t pos = iter->pos;
@@ -253,7 +254,7 @@ static loff_t iomap_dio_bio_iter(const struct iomap_iter *iter,
 	size_t orig_count;
 
 	if ((pos | length) & ((1 << blkbits) - 1) ||
-	    !bdev_iter_is_aligned(iomap->bdev, dio->submit.iter))
+	    !bdev_iter_is_aligned(bdev, dio->submit.iter))
 		return -EINVAL;
 
 	if (iomap->type == IOMAP_UNWRITTEN) {
@@ -275,7 +276,7 @@ static loff_t iomap_dio_bio_iter(const struct iomap_iter *iter,
 		 * cache flushes on IO completion.
 		 */
 		if (!(iomap->flags & (IOMAP_F_SHARED|IOMAP_F_DIRTY)) &&
-		    (dio->flags & IOMAP_DIO_WRITE_FUA) && bdev_fua(iomap->bdev))
+		    (dio->flags & IOMAP_DIO_WRITE_FUA) && bdev_fua(bdev))
 			use_fua = true;
 	}
 
-- 
2.30.2