btrfs: use SECTOR_SHIFT to convert LBA to physical offset

Using SECTOR_SHIFT to convert LBA to physical address makes it more
readable.
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/bio.c

@@ -635,7 +635,7 @@ static bool btrfs_submit_chunk(struct btrfs_bio *bbio, int mirror_num)
 	struct btrfs_fs_info *fs_info = bbio->fs_info;
 	struct btrfs_bio *orig_bbio = bbio;
 	struct bio *bio = &bbio->bio;
-	u64 logical = bio->bi_iter.bi_sector << 9;
+	u64 logical = bio->bi_iter.bi_sector << SECTOR_SHIFT;
 	u64 length = bio->bi_iter.bi_size;
 	u64 map_length = length;
 	bool use_append = btrfs_use_zone_append(bbio);

fs/btrfs/extent-tree.c

@@ -1203,11 +1203,11 @@ static int btrfs_issue_discard(struct block_device *bdev, u64 start, u64 len,
 {
 	int j, ret = 0;
 	u64 bytes_left, end;
-	u64 aligned_start = ALIGN(start, 1 << 9);
+	u64 aligned_start = ALIGN(start, 1 << SECTOR_SHIFT);
 
 	if (WARN_ON(start != aligned_start)) {
 		len -= aligned_start - start;
-		len = round_down(len, 1 << 9);
+		len = round_down(len, 1 << SECTOR_SHIFT);
 		start = aligned_start;
 	}
 

fs/btrfs/file-item.c

@@ -749,7 +749,7 @@ blk_status_t btrfs_csum_one_bio(struct btrfs_bio *bbio)
 	sums->len = bio->bi_iter.bi_size;
 	INIT_LIST_HEAD(&sums->list);
 
-	sums->bytenr = bio->bi_iter.bi_sector << 9;
+	sums->bytenr = bio->bi_iter.bi_sector << SECTOR_SHIFT;
 	index = 0;
 
 	shash->tfm = fs_info->csum_shash;
@@ -799,7 +799,7 @@ blk_status_t btrfs_csum_one_bio(struct btrfs_bio *bbio)
 				ordered = btrfs_lookup_ordered_extent(inode,
 								offset);
 				ASSERT(ordered); /* Logic error */
-				sums->bytenr = (bio->bi_iter.bi_sector << 9)
+				sums->bytenr = (bio->bi_iter.bi_sector << SECTOR_SHIFT)
 					+ total_bytes;
 				index = 0;
 			}

fs/btrfs/raid56.c

@@ -1079,7 +1079,7 @@ static int rbio_add_io_sector(struct btrfs_raid_bio *rbio,
 
 	/* see if we can add this page onto our existing bio */
 	if (last) {
-		u64 last_end = last->bi_iter.bi_sector << 9;
+		u64 last_end = last->bi_iter.bi_sector << SECTOR_SHIFT;
 		last_end += last->bi_iter.bi_size;
 
 		/*