btrfs: tracepoints: constify all pointers

We don't modify the data passed to tracepoints, some of the declarations
are already const, add it to the rest.
Signed-off-by: David Sterba <dsterba@suse.com>

include/trace/events/btrfs.h

@@ -292,7 +292,7 @@ TRACE_EVENT_CONDITION(btrfs_get_extent,
 
 TRACE_EVENT(btrfs_handle_em_exist,
 
-	TP_PROTO(struct btrfs_fs_info *fs_info,
+	TP_PROTO(const struct btrfs_fs_info *fs_info,
 		const struct extent_map *existing, const struct extent_map *map,
 		u64 start, u64 len),
 
@@ -330,8 +330,8 @@ TRACE_EVENT(btrfs_handle_em_exist,
 /* file extent item */
 DECLARE_EVENT_CLASS(btrfs__file_extent_item_regular,
 
-	TP_PROTO(struct btrfs_inode *bi, struct extent_buffer *l,
-		 struct btrfs_file_extent_item *fi, u64 start),
+	TP_PROTO(const struct btrfs_inode *bi, const struct extent_buffer *l,
+		 const struct btrfs_file_extent_item *fi, u64 start),
 
 	TP_ARGS(bi, l, fi, start),
 
@@ -385,8 +385,8 @@ DECLARE_EVENT_CLASS(btrfs__file_extent_item_regular,
 DECLARE_EVENT_CLASS(
 	btrfs__file_extent_item_inline,
 
-	TP_PROTO(struct btrfs_inode *bi, struct extent_buffer *l,
-		 struct btrfs_file_extent_item *fi, int slot, u64 start),
+	TP_PROTO(const struct btrfs_inode *bi, const struct extent_buffer *l,
+		 const struct btrfs_file_extent_item *fi, int slot, u64 start),
 
 	TP_ARGS(bi, l, fi, slot,  start),
 
@@ -426,8 +426,8 @@ DECLARE_EVENT_CLASS(
 DEFINE_EVENT(
 	btrfs__file_extent_item_regular, btrfs_get_extent_show_fi_regular,
 
-	TP_PROTO(struct btrfs_inode *bi, struct extent_buffer *l,
-		 struct btrfs_file_extent_item *fi, u64 start),
+	TP_PROTO(const struct btrfs_inode *bi, const struct extent_buffer *l,
+		 const struct btrfs_file_extent_item *fi, u64 start),
 
 	TP_ARGS(bi, l, fi, start)
 );
@@ -435,8 +435,8 @@ DEFINE_EVENT(
 DEFINE_EVENT(
 	btrfs__file_extent_item_regular, btrfs_truncate_show_fi_regular,
 
-	TP_PROTO(struct btrfs_inode *bi, struct extent_buffer *l,
-		 struct btrfs_file_extent_item *fi, u64 start),
+	TP_PROTO(const struct btrfs_inode *bi, const struct extent_buffer *l,
+		 const struct btrfs_file_extent_item *fi, u64 start),
 
 	TP_ARGS(bi, l, fi, start)
 );
@@ -444,8 +444,8 @@ DEFINE_EVENT(
 DEFINE_EVENT(
 	btrfs__file_extent_item_inline, btrfs_get_extent_show_fi_inline,
 
-	TP_PROTO(struct btrfs_inode *bi, struct extent_buffer *l,
-		 struct btrfs_file_extent_item *fi, int slot, u64 start),
+	TP_PROTO(const struct btrfs_inode *bi, const struct extent_buffer *l,
+		 const struct btrfs_file_extent_item *fi, int slot, u64 start),
 
 	TP_ARGS(bi, l, fi, slot, start)
 );
@@ -453,8 +453,8 @@ DEFINE_EVENT(
 DEFINE_EVENT(
 	btrfs__file_extent_item_inline, btrfs_truncate_show_fi_inline,
 
-	TP_PROTO(struct btrfs_inode *bi, struct extent_buffer *l,
-		 struct btrfs_file_extent_item *fi, int slot, u64 start),
+	TP_PROTO(const struct btrfs_inode *bi, const struct extent_buffer *l,
+		 const struct btrfs_file_extent_item *fi, int slot, u64 start),
 
 	TP_ARGS(bi, l, fi, slot, start)
 );
@@ -1018,7 +1018,7 @@ TRACE_EVENT(btrfs_cow_block,
 
 TRACE_EVENT(btrfs_space_reservation,
 
-	TP_PROTO(const struct btrfs_fs_info *fs_info, char *type, u64 val,
+	TP_PROTO(const struct btrfs_fs_info *fs_info, const char *type, u64 val,
 		 u64 bytes, int reserve),
 
 	TP_ARGS(fs_info, type, val, bytes, reserve),
@@ -1051,7 +1051,7 @@ TRACE_EVENT(btrfs_space_reservation,
 TRACE_EVENT(btrfs_trigger_flush,
 
 	TP_PROTO(const struct btrfs_fs_info *fs_info, u64 flags, u64 bytes,
-		 int flush, char *reason),
+		 int flush, const char *reason),
 
 	TP_ARGS(fs_info, flags, bytes, flush, reason),
 
@@ -1642,7 +1642,7 @@ TRACE_EVENT(btrfs_qgroup_account_extent,
 TRACE_EVENT(qgroup_update_counters,
 
 	TP_PROTO(const struct btrfs_fs_info *fs_info,
-		 struct btrfs_qgroup *qgroup,
+		 const struct btrfs_qgroup *qgroup,
 		 u64 cur_old_count, u64 cur_new_count),
 
 	TP_ARGS(fs_info, qgroup, cur_old_count, cur_new_count),
@@ -1823,7 +1823,7 @@ DEFINE_EVENT(btrfs__prelim_ref, btrfs_prelim_ref_insert,
 );
 
 TRACE_EVENT(btrfs_inode_mod_outstanding_extents,
-	TP_PROTO(struct btrfs_root *root, u64 ino, int mod),
+	TP_PROTO(const struct btrfs_root *root, u64 ino, int mod),
 
 	TP_ARGS(root, ino, mod),
 
@@ -1904,7 +1904,7 @@ TRACE_EVENT(btrfs_set_extent_bit,
 	TP_fast_assign_btrfs(tree->fs_info,
 		__entry->owner = tree->owner;
 		if (tree->private_data) {
-			struct inode *inode = tree->private_data;
+			const struct inode *inode = tree->private_data;
 
 			__entry->ino	= btrfs_ino(BTRFS_I(inode));
 			__entry->rootid	=
@@ -1943,7 +1943,7 @@ TRACE_EVENT(btrfs_clear_extent_bit,
 	TP_fast_assign_btrfs(tree->fs_info,
 		__entry->owner = tree->owner;
 		if (tree->private_data) {
-			struct inode *inode = tree->private_data;
+			const struct inode *inode = tree->private_data;
 
 			__entry->ino	= btrfs_ino(BTRFS_I(inode));
 			__entry->rootid	=
@@ -1983,7 +1983,7 @@ TRACE_EVENT(btrfs_convert_extent_bit,
 	TP_fast_assign_btrfs(tree->fs_info,
 		__entry->owner = tree->owner;
 		if (tree->private_data) {
-			struct inode *inode = tree->private_data;
+			const struct inode *inode = tree->private_data;
 
 			__entry->ino	= btrfs_ino(BTRFS_I(inode));
 			__entry->rootid	=
@@ -2092,8 +2092,8 @@ DEFINE_BTRFS_LOCK_EVENT(btrfs_tree_read_lock_atomic);
 
 DECLARE_EVENT_CLASS(btrfs__space_info_update,
 
-	TP_PROTO(struct btrfs_fs_info *fs_info,
-		 struct btrfs_space_info *sinfo, u64 old, s64 diff),
+	TP_PROTO(const struct btrfs_fs_info *fs_info,
+		 const struct btrfs_space_info *sinfo, u64 old, s64 diff),
 
 	TP_ARGS(fs_info, sinfo, old, diff),
 
@@ -2115,16 +2115,16 @@ DECLARE_EVENT_CLASS(btrfs__space_info_update,
 
 DEFINE_EVENT(btrfs__space_info_update, update_bytes_may_use,
 
-	TP_PROTO(struct btrfs_fs_info *fs_info,
-		 struct btrfs_space_info *sinfo, u64 old, s64 diff),
+	TP_PROTO(const struct btrfs_fs_info *fs_info,
+		 const struct btrfs_space_info *sinfo, u64 old, s64 diff),
 
 	TP_ARGS(fs_info, sinfo, old, diff)
 );
 
 DEFINE_EVENT(btrfs__space_info_update, update_bytes_pinned,
 
-	TP_PROTO(struct btrfs_fs_info *fs_info,
-		 struct btrfs_space_info *sinfo, u64 old, s64 diff),
+	TP_PROTO(const struct btrfs_fs_info *fs_info,
+		 const struct btrfs_space_info *sinfo, u64 old, s64 diff),
 
 	TP_ARGS(fs_info, sinfo, old, diff)
 );