[PATCH 4/4] btrfs: change name and type of private member of btrfs_free_space_ctl

[Nikolay Borisov <nborisov@suse.com>]

btrfs_free_space_ctl::private is either unset or it always points to
struct btrfs_block_group when it is set. So there's no point in keeping
the unhelpful 'private' name and keeping it an untyped pointer. Change
both the type and name to be self-describing. No functional changes.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
---
 fs/btrfs/free-space-cache.c | 12 ++++++------
 fs/btrfs/free-space-cache.h |  2 +-
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index 1e1299bfe380..51c688c9d12c 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -666,7 +666,7 @@ static int io_ctl_read_bitmap(struct btrfs_io_ctl *io_ctl,
 
 static void recalculate_thresholds(struct btrfs_free_space_ctl *ctl)
 {
-	struct btrfs_block_group *block_group = ctl->private;
+	struct btrfs_block_group *block_group = ctl->block_group;
 	u64 max_bytes;
 	u64 bitmap_bytes;
 	u64 extent_bytes;
@@ -2084,7 +2084,7 @@ static u64 add_bytes_to_bitmap(struct btrfs_free_space_ctl *ctl,
 static bool use_bitmap(struct btrfs_free_space_ctl *ctl,
 		      struct btrfs_free_space *info)
 {
-	struct btrfs_block_group *block_group = ctl->private;
+	struct btrfs_block_group *block_group = ctl->block_group;
 	struct btrfs_fs_info *fs_info = block_group->fs_info;
 	bool forced = false;
 
@@ -2153,7 +2153,7 @@ static int insert_into_bitmap(struct btrfs_free_space_ctl *ctl,
 		return 0;
 
 	if (ctl->op == &free_space_op)
-		block_group = ctl->private;
+		block_group = ctl->block_group;
 again:
 	/*
 	 * Since we link bitmaps right into the cluster we need to see if we
@@ -2769,7 +2769,7 @@ void btrfs_init_free_space_ctl(struct btrfs_block_group *block_group,
 	spin_lock_init(&ctl->tree_lock);
 	ctl->unit = fs_info->sectorsize;
 	ctl->start = block_group->start;
-	ctl->private = block_group;
+	ctl->block_group = block_group;
 	ctl->op = &free_space_op;
 	INIT_LIST_HEAD(&ctl->trimming_ranges);
 	mutex_init(&ctl->cache_writeout_mutex);
@@ -2865,8 +2865,8 @@ void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl)
 {
 	spin_lock(&ctl->tree_lock);
 	__btrfs_remove_free_space_cache_locked(ctl);
-	if (ctl->private)
-		btrfs_discard_update_discardable(ctl->private);
+	if (ctl->block_group)
+		btrfs_discard_update_discardable(ctl->block_group);
 	spin_unlock(&ctl->tree_lock);
 }
 
diff --git a/fs/btrfs/free-space-cache.h b/fs/btrfs/free-space-cache.h
index b35137e1f21a..0d245c0fc45e 100644
--- a/fs/btrfs/free-space-cache.h
+++ b/fs/btrfs/free-space-cache.h
@@ -54,7 +54,7 @@ struct btrfs_free_space_ctl {
 	s32 discardable_extents[BTRFS_STAT_NR_ENTRIES];
 	s64 discardable_bytes[BTRFS_STAT_NR_ENTRIES];
 	const struct btrfs_free_space_op *op;
-	void *private;
+	struct btrfs_block_group *block_group;
 	struct mutex cache_writeout_mutex;
 	struct list_head trimming_ranges;
 };
-- 
2.17.1