btrfs: remove blocksize from reada_extent

Replace with global nodesize instead.
Signed-off-by: David Sterba <dsterba@suse.cz>

fs/btrfs/reada.c

@@ -66,7 +66,6 @@ struct reada_extctl {
 struct reada_extent {
 	u64			logical;
 	struct btrfs_key	top;
-	u32			blocksize;
 	int			err;
 	struct list_head	extctl;
 	int 			refcnt;
@@ -349,7 +348,6 @@ static struct reada_extent *reada_find_extent(struct btrfs_root *root,
 
 	blocksize = root->nodesize;
 	re->logical = logical;
-	re->blocksize = blocksize;
 	re->top = *top;
 	INIT_LIST_HEAD(&re->extctl);
 	spin_lock_init(&re->lock);
@@ -660,7 +658,6 @@ static int reada_start_machine_dev(struct btrfs_fs_info *fs_info,
 	int mirror_num = 0;
 	struct extent_buffer *eb = NULL;
 	u64 logical;
-	u32 blocksize;
 	int ret;
 	int i;
 	int need_kick = 0;
@@ -694,7 +691,7 @@ static int reada_start_machine_dev(struct btrfs_fs_info *fs_info,
 		spin_unlock(&fs_info->reada_lock);
 		return 0;
 	}
-	dev->reada_next = re->logical + re->blocksize;
+	dev->reada_next = re->logical + fs_info->tree_root->nodesize;
 	re->refcnt++;
 
 	spin_unlock(&fs_info->reada_lock);
@@ -709,7 +706,6 @@ static int reada_start_machine_dev(struct btrfs_fs_info *fs_info,
 		}
 	}
 	logical = re->logical;
-	blocksize = re->blocksize;
 
 	spin_lock(&re->lock);
 	if (re->scheduled_for == NULL) {
@@ -724,8 +720,8 @@ static int reada_start_machine_dev(struct btrfs_fs_info *fs_info,
 		return 0;
 
 	atomic_inc(&dev->reada_in_flight);
-	ret = reada_tree_block_flagged(fs_info->extent_root, logical, blocksize,
-			 mirror_num, &eb);
+	ret = reada_tree_block_flagged(fs_info->extent_root, logical,
+			fs_info->tree_root->nodesize, mirror_num, &eb);
 	if (ret)
 		__readahead_hook(fs_info->extent_root, NULL, logical, ret);
 	else if (eb)
@@ -851,7 +847,7 @@ static void dump_devs(struct btrfs_fs_info *fs_info, int all)
 				break;
 			printk(KERN_DEBUG
 				"  re: logical %llu size %u empty %d for %lld",
-				re->logical, re->blocksize,
+				re->logical, fs_info->tree_root->nodesize,
 				list_empty(&re->extctl), re->scheduled_for ?
 				re->scheduled_for->devid : -1);
 
@@ -886,7 +882,8 @@ static void dump_devs(struct btrfs_fs_info *fs_info, int all)
 		}
 		printk(KERN_DEBUG
 			"re: logical %llu size %u list empty %d for %lld",
-			re->logical, re->blocksize, list_empty(&re->extctl),
+			re->logical, fs_info->tree_root->nodesize,
+			list_empty(&re->extctl),
 			re->scheduled_for ? re->scheduled_for->devid : -1);
 		for (i = 0; i < re->nzones; ++i) {
 			printk(KERN_CONT " zone %llu-%llu devs",