btrfs: use booleans where appropriate for the tree mod log functions

Several functions of the tree modification log use integers as booleans,
so change them to use booleans instead, making their use more clear.

Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/ctree.c

@@ -500,7 +500,7 @@ static noinline int __btrfs_cow_block(struct btrfs_trans_handle *trans,
 			parent_start = buf->start;
 
 		atomic_inc(&cow->refs);
-		ret = btrfs_tree_mod_log_insert_root(root->node, cow, 1);
+		ret = btrfs_tree_mod_log_insert_root(root->node, cow, true);
 		BUG_ON(ret < 0);
 		rcu_assign_pointer(root->node, cow);
 
@@ -958,7 +958,7 @@ static noinline int balance_level(struct btrfs_trans_handle *trans,
 			goto enospc;
 		}
 
-		ret = btrfs_tree_mod_log_insert_root(root->node, child, 1);
+		ret = btrfs_tree_mod_log_insert_root(root->node, child, true);
 		BUG_ON(ret < 0);
 		rcu_assign_pointer(root->node, child);
 
@@ -2460,7 +2460,7 @@ static noinline int insert_new_root(struct btrfs_trans_handle *trans,
 	btrfs_mark_buffer_dirty(c);
 
 	old = root->node;
-	ret = btrfs_tree_mod_log_insert_root(root->node, c, 0);
+	ret = btrfs_tree_mod_log_insert_root(root->node, c, false);
 	BUG_ON(ret < 0);
 	rcu_assign_pointer(root->node, c);
 

fs/btrfs/tree-mod-log.c

@@ -158,40 +158,40 @@ static noinline int tree_mod_log_insert(struct btrfs_fs_info *fs_info,
 }
 
 /*
- * Determines if logging can be omitted. Returns 1 if it can. Otherwise, it
- * returns zero with the tree_mod_log_lock acquired. The caller must hold
+ * Determines if logging can be omitted. Returns true if it can. Otherwise, it
+ * returns false with the tree_mod_log_lock acquired. The caller must hold
  * this until all tree mod log insertions are recorded in the rb tree and then
  * write unlock fs_info::tree_mod_log_lock.
  */
-static inline int tree_mod_dont_log(struct btrfs_fs_info *fs_info,
+static inline bool tree_mod_dont_log(struct btrfs_fs_info *fs_info,
 				    struct extent_buffer *eb)
 {
 	smp_mb();
 	if (list_empty(&(fs_info)->tree_mod_seq_list))
-		return 1;
+		return true;
 	if (eb && btrfs_header_level(eb) == 0)
-		return 1;
+		return true;
 
 	write_lock(&fs_info->tree_mod_log_lock);
 	if (list_empty(&(fs_info)->tree_mod_seq_list)) {
 		write_unlock(&fs_info->tree_mod_log_lock);
-		return 1;
+		return true;
 	}
 
-	return 0;
+	return false;
 }
 
 /* Similar to tree_mod_dont_log, but doesn't acquire any locks. */
-static inline int tree_mod_need_log(const struct btrfs_fs_info *fs_info,
+static inline bool tree_mod_need_log(const struct btrfs_fs_info *fs_info,
 				    struct extent_buffer *eb)
 {
 	smp_mb();
 	if (list_empty(&(fs_info)->tree_mod_seq_list))
-		return 0;
+		return false;
 	if (eb && btrfs_header_level(eb) == 0)
-		return 0;
+		return false;
 
-	return 1;
+	return true;
 }
 
 static struct tree_mod_elem *alloc_tree_mod_elem(struct extent_buffer *eb,
@@ -252,7 +252,7 @@ int btrfs_tree_mod_log_insert_move(struct extent_buffer *eb,
 	struct tree_mod_elem **tm_list = NULL;
 	int ret = 0;
 	int i;
-	int locked = 0;
+	bool locked = false;
 
 	if (!tree_mod_need_log(eb->fs_info, eb))
 		return 0;
@@ -284,7 +284,7 @@ int btrfs_tree_mod_log_insert_move(struct extent_buffer *eb,
 
 	if (tree_mod_dont_log(eb->fs_info, eb))
 		goto free_tms;
-	locked = 1;
+	locked = true;
 
 	/*
 	 * When we override something during the move, we log these removals.
@@ -341,7 +341,7 @@ static inline int tree_mod_log_free_eb(struct btrfs_fs_info *fs_info,
 
 int btrfs_tree_mod_log_insert_root(struct extent_buffer *old_root,
 				   struct extent_buffer *new_root,
-				   int log_removal)
+				   bool log_removal)
 {
 	struct btrfs_fs_info *fs_info = old_root->fs_info;
 	struct tree_mod_elem *tm = NULL;
@@ -411,7 +411,7 @@ int btrfs_tree_mod_log_insert_root(struct extent_buffer *old_root,
 
 static struct tree_mod_elem *__tree_mod_log_search(struct btrfs_fs_info *fs_info,
 						   u64 start, u64 min_seq,
-						   int smallest)
+						   bool smallest)
 {
 	struct rb_root *tm_root;
 	struct rb_node *node;
@@ -459,7 +459,7 @@ static struct tree_mod_elem *__tree_mod_log_search(struct btrfs_fs_info *fs_info
 static struct tree_mod_elem *tree_mod_log_search_oldest(struct btrfs_fs_info *fs_info,
 							u64 start, u64 min_seq)
 {
-	return __tree_mod_log_search(fs_info, start, min_seq, 1);
+	return __tree_mod_log_search(fs_info, start, min_seq, true);
 }
 
 /*
@@ -470,7 +470,7 @@ static struct tree_mod_elem *tree_mod_log_search_oldest(struct btrfs_fs_info *fs
 static struct tree_mod_elem *tree_mod_log_search(struct btrfs_fs_info *fs_info,
 						 u64 start, u64 min_seq)
 {
-	return __tree_mod_log_search(fs_info, start, min_seq, 0);
+	return __tree_mod_log_search(fs_info, start, min_seq, false);
 }
 
 int btrfs_tree_mod_log_eb_copy(struct extent_buffer *dst,
@@ -484,7 +484,7 @@ int btrfs_tree_mod_log_eb_copy(struct extent_buffer *dst,
 	struct tree_mod_elem **tm_list = NULL;
 	struct tree_mod_elem **tm_list_add, **tm_list_rem;
 	int i;
-	int locked = 0;
+	bool locked = false;
 
 	if (!tree_mod_need_log(fs_info, NULL))
 		return 0;
@@ -517,7 +517,7 @@ int btrfs_tree_mod_log_eb_copy(struct extent_buffer *dst,
 
 	if (tree_mod_dont_log(fs_info, NULL))
 		goto free_tms;
-	locked = 1;
+	locked = true;
 
 	for (i = 0; i < nr_items; i++) {
 		ret = tree_mod_log_insert(fs_info, tm_list_rem[i]);
@@ -602,7 +602,7 @@ static struct tree_mod_elem *tree_mod_log_oldest_root(struct extent_buffer *eb_r
 	struct tree_mod_elem *tm;
 	struct tree_mod_elem *found = NULL;
 	u64 root_logical = eb_root->start;
-	int looped = 0;
+	bool looped = false;
 
 	if (!time_seq)
 		return NULL;
@@ -636,7 +636,7 @@ static struct tree_mod_elem *tree_mod_log_oldest_root(struct extent_buffer *eb_r
 
 		found = tm;
 		root_logical = tm->old_root.logical;
-		looped = 1;
+		looped = true;
 	}
 
 	/* If there's no old root to return, return what we found instead */

fs/btrfs/tree-mod-log.h

@@ -30,7 +30,7 @@ void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info,
 			    struct btrfs_seq_list *elem);
 int btrfs_tree_mod_log_insert_root(struct extent_buffer *old_root,
 				   struct extent_buffer *new_root,
-				   int log_removal);
+				   bool log_removal);
 int btrfs_tree_mod_log_insert_key(struct extent_buffer *eb, int slot,
 				  enum btrfs_mod_log_op op, gfp_t flags);
 int btrfs_tree_mod_log_free_eb(struct extent_buffer *eb);