Btrfs: add initial tracepoint support for btrfs

Tracepoints can provide insight into why btrfs hits bugs and be greatly
helpful for debugging, e.g
              dd-7822  [000]  2121.641088: btrfs_inode_request: root = 5(FS_TREE), gen = 4, ino = 256, blocks = 8, disk_i_size = 0, last_trans = 8, logged_trans = 0
              dd-7822  [000]  2121.641100: btrfs_inode_new: root = 5(FS_TREE), gen = 8, ino = 257, blocks = 0, disk_i_size = 0, last_trans = 0, logged_trans = 0
 btrfs-transacti-7804  [001]  2146.935420: btrfs_cow_block: root = 2(EXTENT_TREE), refs = 2, orig_buf = 29368320 (orig_level = 0), cow_buf = 29388800 (cow_level = 0)
 btrfs-transacti-7804  [001]  2146.935473: btrfs_cow_block: root = 1(ROOT_TREE), refs = 2, orig_buf = 29364224 (orig_level = 0), cow_buf = 29392896 (cow_level = 0)
 btrfs-transacti-7804  [001]  2146.972221: btrfs_transaction_commit: root = 1(ROOT_TREE), gen = 8
   flush-btrfs-2-7821  [001]  2155.824210: btrfs_chunk_alloc: root = 3(CHUNK_TREE), offset = 1103101952, size = 1073741824, num_stripes = 1, sub_stripes = 0, type = DATA
   flush-btrfs-2-7821  [001]  2155.824241: btrfs_cow_block: root = 2(EXTENT_TREE), refs = 2, orig_buf = 29388800 (orig_level = 0), cow_buf = 29396992 (cow_level = 0)
   flush-btrfs-2-7821  [001]  2155.824255: btrfs_cow_block: root = 4(DEV_TREE), refs = 2, orig_buf = 29372416 (orig_level = 0), cow_buf = 29401088 (cow_level = 0)
   flush-btrfs-2-7821  [000]  2155.824329: btrfs_cow_block: root = 3(CHUNK_TREE), refs = 2, orig_buf = 20971520 (orig_level = 0), cow_buf = 20975616 (cow_level = 0)
 btrfs-endio-wri-7800  [001]  2155.898019: btrfs_cow_block: root = 5(FS_TREE), refs = 2, orig_buf = 29384704 (orig_level = 0), cow_buf = 29405184 (cow_level = 0)
 btrfs-endio-wri-7800  [001]  2155.898043: btrfs_cow_block: root = 7(CSUM_TREE), refs = 2, orig_buf = 29376512 (orig_level = 0), cow_buf = 29409280 (cow_level = 0)

Here is what I have added:

1) ordere_extent:
        btrfs_ordered_extent_add
        btrfs_ordered_extent_remove
        btrfs_ordered_extent_start
        btrfs_ordered_extent_put

These provide critical information to understand how ordered_extents are
updated.

2) extent_map:
        btrfs_get_extent

extent_map is used in both read and write cases, and it is useful for tracking
how btrfs specific IO is running.

3) writepage:
        __extent_writepage
        btrfs_writepage_end_io_hook

Pages are cirtical resourses and produce a lot of corner cases during writeback,
so it is valuable to know how page is written to disk.

4) inode:
        btrfs_inode_new
        btrfs_inode_request
        btrfs_inode_evict

These can show where and when a inode is created, when a inode is evicted.

5) sync:
        btrfs_sync_file
        btrfs_sync_fs

These show sync arguments.

6) transaction:
        btrfs_transaction_commit

In transaction based filesystem, it will be useful to know the generation and
who does commit.

7) back reference and cow:
	btrfs_delayed_tree_ref
	btrfs_delayed_data_ref
	btrfs_delayed_ref_head
	btrfs_cow_block

Btrfs natively supports back references, these tracepoints are helpful on
understanding btrfs's COW mechanism.

8) chunk:
	btrfs_chunk_alloc
	btrfs_chunk_free

Chunk is a link between physical offset and logical offset, and stands for space
infomation in btrfs, and these are helpful on tracing space things.

9) reserved_extent:
	btrfs_reserved_extent_alloc
	btrfs_reserved_extent_free

These can show how btrfs uses its space.

Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 667 insertions, 0 deletions

diff --git a/include/trace/events/btrfs.h b/include/trace/events/btrfs.h
new file mode 100644
index 0000000..f445cff
--- /dev/null
+++ b/include/trace/events/btrfs.h
@@ -0,0 +1,667 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM btrfs
+
+#if !defined(_TRACE_BTRFS_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_BTRFS_H
+
+#include <linux/writeback.h>
+#include <linux/tracepoint.h>
+
+struct btrfs_root;
+struct btrfs_fs_info;
+struct btrfs_inode;
+struct extent_map;
+struct btrfs_ordered_extent;
+struct btrfs_delayed_ref_node;
+struct btrfs_delayed_tree_ref;
+struct btrfs_delayed_data_ref;
+struct btrfs_delayed_ref_head;
+struct map_lookup;
+struct extent_buffer;
+
+#define show_ref_type(type)						\
+	__print_symbolic(type,						\
+		{ BTRFS_TREE_BLOCK_REF_KEY, 	"TREE_BLOCK_REF" },	\
+		{ BTRFS_EXTENT_DATA_REF_KEY, 	"EXTENT_DATA_REF" },	\
+		{ BTRFS_EXTENT_REF_V0_KEY, 	"EXTENT_REF_V0" },	\
+		{ BTRFS_SHARED_BLOCK_REF_KEY, 	"SHARED_BLOCK_REF" },	\
+		{ BTRFS_SHARED_DATA_REF_KEY, 	"SHARED_DATA_REF" })
+
+#define __show_root_type(obj)						\
+	__print_symbolic(obj,						\
+		{ BTRFS_ROOT_TREE_OBJECTID, 	"ROOT_TREE"	},	\
+		{ BTRFS_EXTENT_TREE_OBJECTID, 	"EXTENT_TREE"	},	\
+		{ BTRFS_CHUNK_TREE_OBJECTID, 	"CHUNK_TREE"	},	\
+		{ BTRFS_DEV_TREE_OBJECTID, 	"DEV_TREE"	},	\
+		{ BTRFS_FS_TREE_OBJECTID, 	"FS_TREE"	},	\
+		{ BTRFS_ROOT_TREE_DIR_OBJECTID, "ROOT_TREE_DIR"	},	\
+		{ BTRFS_CSUM_TREE_OBJECTID, 	"CSUM_TREE"	},	\
+		{ BTRFS_TREE_LOG_OBJECTID,	"TREE_LOG"	},	\
+		{ BTRFS_TREE_RELOC_OBJECTID,	"TREE_RELOC"	},	\
+		{ BTRFS_DATA_RELOC_TREE_OBJECTID, "DATA_RELOC_TREE" })
+
+#define show_root_type(obj)						\
+	obj, ((obj >= BTRFS_DATA_RELOC_TREE_OBJECTID) ||		\
+	      (obj <= BTRFS_CSUM_TREE_OBJECTID )) ? __show_root_type(obj) : "-"
+
+TRACE_EVENT(btrfs_transaction_commit,
+
+	TP_PROTO(struct btrfs_root *root),
+
+	TP_ARGS(root),
+
+	TP_STRUCT__entry(
+		__field(	u64,  generation		)
+		__field(	u64,  root_objectid		)
+	),
+
+	TP_fast_assign(
+		__entry->generation	= root->fs_info->generation;
+		__entry->root_objectid	= root->root_key.objectid;
+	),
+
+	TP_printk("root = %llu(%s), gen = %llu",
+		  show_root_type(__entry->root_objectid),
+		  (unsigned long long)__entry->generation)
+);
+
+DECLARE_EVENT_CLASS(btrfs__inode,
+
+	TP_PROTO(struct inode *inode),
+
+	TP_ARGS(inode),
+
+	TP_STRUCT__entry(
+		__field(	ino_t,  ino			)
+		__field(	blkcnt_t,  blocks		)
+		__field(	u64,  disk_i_size		)
+		__field(	u64,  generation		)
+		__field(	u64,  last_trans		)
+		__field(	u64,  logged_trans		)
+		__field(	u64,  root_objectid		)
+	),
+
+	TP_fast_assign(
+		__entry->ino	= inode->i_ino;
+		__entry->blocks	= inode->i_blocks;
+		__entry->disk_i_size  = BTRFS_I(inode)->disk_i_size;
+		__entry->generation = BTRFS_I(inode)->generation;
+		__entry->last_trans = BTRFS_I(inode)->last_trans;
+		__entry->logged_trans = BTRFS_I(inode)->logged_trans;
+		__entry->root_objectid =
+				BTRFS_I(inode)->root->root_key.objectid;
+	),
+
+	TP_printk("root = %llu(%s), gen = %llu, ino = %lu, blocks = %llu, "
+		  "disk_i_size = %llu, last_trans = %llu, logged_trans = %llu",
+		  show_root_type(__entry->root_objectid),
+		  (unsigned long long)__entry->generation,
+		  (unsigned long)__entry->ino,
+		  (unsigned long long)__entry->blocks,
+		  (unsigned long long)__entry->disk_i_size,
+		  (unsigned long long)__entry->last_trans,
+		  (unsigned long long)__entry->logged_trans)
+);
+
+DEFINE_EVENT(btrfs__inode, btrfs_inode_new,
+
+	TP_PROTO(struct inode *inode),
+
+	TP_ARGS(inode)
+);
+
+DEFINE_EVENT(btrfs__inode, btrfs_inode_request,
+
+	TP_PROTO(struct inode *inode),
+
+	TP_ARGS(inode)
+);
+
+DEFINE_EVENT(btrfs__inode, btrfs_inode_evict,
+
+	TP_PROTO(struct inode *inode),
+
+	TP_ARGS(inode)
+);
+
+#define __show_map_type(type)						\
+	__print_symbolic(type,						\
+		{ EXTENT_MAP_LAST_BYTE, "LAST_BYTE" 	},		\
+		{ EXTENT_MAP_HOLE, 	"HOLE" 		},		\
+		{ EXTENT_MAP_INLINE, 	"INLINE" 	},		\
+		{ EXTENT_MAP_DELALLOC,	"DELALLOC" 	})
+
+#define show_map_type(type)			\
+	type, (type >= EXTENT_MAP_LAST_BYTE) ? "-" :  __show_map_type(type)
+
+#define show_map_flags(flag)						\
+	__print_flags(flag, "|",					\
+		{ EXTENT_FLAG_PINNED, 		"PINNED" 	},	\
+		{ EXTENT_FLAG_COMPRESSED, 	"COMPRESSED" 	},	\
+		{ EXTENT_FLAG_VACANCY, 		"VACANCY" 	},	\
+		{ EXTENT_FLAG_PREALLOC, 	"PREALLOC" 	})
+
+TRACE_EVENT(btrfs_get_extent,
+
+	TP_PROTO(struct btrfs_root *root, struct extent_map *map),
+
+	TP_ARGS(root, map),
+
+	TP_STRUCT__entry(
+		__field(	u64,  root_objectid	)
+		__field(	u64,  start		)
+		__field(	u64,  len		)
+		__field(	u64,  orig_start	)
+		__field(	u64,  block_start	)
+		__field(	u64,  block_len		)
+		__field(	unsigned long,  flags	)
+		__field(	int,  refs		)
+		__field(	unsigned int,  compress_type	)
+	),
+
+	TP_fast_assign(
+		__entry->root_objectid	= root->root_key.objectid;
+		__entry->start 		= map->start;
+		__entry->len		= map->len;
+		__entry->orig_start	= map->orig_start;
+		__entry->block_start	= map->block_start;
+		__entry->block_len	= map->block_len;
+		__entry->flags		= map->flags;
+		__entry->refs		= atomic_read(&map->refs);
+		__entry->compress_type	= map->compress_type;
+	),
+
+	TP_printk("root = %llu(%s), start = %llu, len = %llu, "
+		  "orig_start = %llu, block_start = %llu(%s), "
+		  "block_len = %llu, flags = %s, refs = %u, "
+		  "compress_type = %u",
+		  show_root_type(__entry->root_objectid),
+		  (unsigned long long)__entry->start,
+		  (unsigned long long)__entry->len,
+		  (unsigned long long)__entry->orig_start,
+		  show_map_type(__entry->block_start),
+		  (unsigned long long)__entry->block_len,
+		  show_map_flags(__entry->flags),
+		  __entry->refs, __entry->compress_type)
+);
+
+#define show_ordered_flags(flags)					\
+	__print_symbolic(flags,					\
+		{ BTRFS_ORDERED_IO_DONE, 	"IO_DONE" 	},	\
+		{ BTRFS_ORDERED_COMPLETE, 	"COMPLETE" 	},	\
+		{ BTRFS_ORDERED_NOCOW, 		"NOCOW" 	},	\
+		{ BTRFS_ORDERED_COMPRESSED, 	"COMPRESSED" 	},	\
+		{ BTRFS_ORDERED_PREALLOC, 	"PREALLOC" 	},	\
+		{ BTRFS_ORDERED_DIRECT, 	"DIRECT" 	})
+
+DECLARE_EVENT_CLASS(btrfs__ordered_extent,
+
+	TP_PROTO(struct inode *inode, struct btrfs_ordered_extent *ordered),
+
+	TP_ARGS(inode, ordered),
+
+	TP_STRUCT__entry(
+		__field(	ino_t,  ino		)
+		__field(	u64,  file_offset	)
+		__field(	u64,  start		)
+		__field(	u64,  len		)
+		__field(	u64,  disk_len		)
+		__field(	u64,  bytes_left	)
+		__field(	unsigned long,  flags	)
+		__field(	int,  compress_type	)
+		__field(	int,  refs		)
+		__field(	u64,  root_objectid	)
+	),
+
+	TP_fast_assign(
+		__entry->ino 		= inode->i_ino;
+		__entry->file_offset	= ordered->file_offset;
+		__entry->start		= ordered->start;
+		__entry->len		= ordered->len;
+		__entry->disk_len	= ordered->disk_len;
+		__entry->bytes_left	= ordered->bytes_left;
+		__entry->flags		= ordered->flags;
+		__entry->compress_type	= ordered->compress_type;
+		__entry->refs		= atomic_read(&ordered->refs);
+		__entry->root_objectid	=
+				BTRFS_I(inode)->root->root_key.objectid;
+	),
+
+	TP_printk("root = %llu(%s), ino = %llu, file_offset = %llu, "
+		  "start = %llu, len = %llu, disk_len = %llu, "
+		  "bytes_left = %llu, flags = %s, compress_type = %d, "
+		  "refs = %d",
+		  show_root_type(__entry->root_objectid),
+		  (unsigned long long)__entry->ino,
+		  (unsigned long long)__entry->file_offset,
+		  (unsigned long long)__entry->start,
+		  (unsigned long long)__entry->len,
+		  (unsigned long long)__entry->disk_len,
+		  (unsigned long long)__entry->bytes_left,
+		  show_ordered_flags(__entry->flags),
+		  __entry->compress_type, __entry->refs)
+);
+
+DEFINE_EVENT(btrfs__ordered_extent, btrfs_ordered_extent_add,
+
+	TP_PROTO(struct inode *inode, struct btrfs_ordered_extent *ordered),
+
+	TP_ARGS(inode, ordered)
+);
+
+DEFINE_EVENT(btrfs__ordered_extent, btrfs_ordered_extent_remove,
+
+	TP_PROTO(struct inode *inode, struct btrfs_ordered_extent *ordered),
+
+	TP_ARGS(inode, ordered)
+);
+
+DEFINE_EVENT(btrfs__ordered_extent, btrfs_ordered_extent_start,
+
+	TP_PROTO(struct inode *inode, struct btrfs_ordered_extent *ordered),
+
+	TP_ARGS(inode, ordered)
+);
+
+DEFINE_EVENT(btrfs__ordered_extent, btrfs_ordered_extent_put,
+
+	TP_PROTO(struct inode *inode, struct btrfs_ordered_extent *ordered),
+
+	TP_ARGS(inode, ordered)
+);
+
+DECLARE_EVENT_CLASS(btrfs__writepage,
+
+	TP_PROTO(struct page *page, struct inode *inode,
+		 struct writeback_control *wbc),
+
+	TP_ARGS(page, inode, wbc),
+
+	TP_STRUCT__entry(
+		__field(	ino_t,  ino			)
+		__field(	pgoff_t,  index			)
+		__field(	long,   nr_to_write		)
+		__field(	long,   pages_skipped		)
+		__field(	loff_t, range_start		)
+		__field(	loff_t, range_end		)
+		__field(	char,   nonblocking		)
+		__field(	char,   for_kupdate		)
+		__field(	char,   for_reclaim		)
+		__field(	char,   range_cyclic		)
+		__field(	pgoff_t,  writeback_index	)
+		__field(	u64,    root_objectid		)
+	),
+
+	TP_fast_assign(
+		__entry->ino		= inode->i_ino;
+		__entry->index		= page->index;
+		__entry->nr_to_write	= wbc->nr_to_write;
+		__entry->pages_skipped	= wbc->pages_skipped;
+		__entry->range_start	= wbc->range_start;
+		__entry->range_end	= wbc->range_end;
+		__entry->nonblocking	= wbc->nonblocking;
+		__entry->for_kupdate	= wbc->for_kupdate;
+		__entry->for_reclaim	= wbc->for_reclaim;
+		__entry->range_cyclic	= wbc->range_cyclic;
+		__entry->writeback_index = inode->i_mapping->writeback_index;
+		__entry->root_objectid	=
+				 BTRFS_I(inode)->root->root_key.objectid;
+	),
+
+	TP_printk("root = %llu(%s), ino = %lu, page_index = %lu, "
+		  "nr_to_write = %ld, pages_skipped = %ld, range_start = %llu, "
+		  "range_end = %llu, nonblocking = %d, for_kupdate = %d, "
+		  "for_reclaim = %d, range_cyclic = %d, writeback_index = %lu",
+		  show_root_type(__entry->root_objectid),
+		  (unsigned long)__entry->ino, __entry->index,
+		  __entry->nr_to_write, __entry->pages_skipped,
+		  __entry->range_start, __entry->range_end,
+		  __entry->nonblocking, __entry->for_kupdate,
+		  __entry->for_reclaim, __entry->range_cyclic,
+		  (unsigned long)__entry->writeback_index)
+);
+
+DEFINE_EVENT(btrfs__writepage, __extent_writepage,
+
+	TP_PROTO(struct page *page, struct inode *inode,
+		 struct writeback_control *wbc),
+
+	TP_ARGS(page, inode, wbc)
+);
+
+TRACE_EVENT(btrfs_writepage_end_io_hook,
+
+	TP_PROTO(struct page *page, u64 start, u64 end, int uptodate),
+
+	TP_ARGS(page, start, end, uptodate),
+
+	TP_STRUCT__entry(
+		__field(	ino_t,	 ino		)
+		__field(	pgoff_t, index		)
+		__field(	u64,	 start		)
+		__field(	u64,	 end		)
+		__field(	int,	 uptodate	)
+		__field(	u64,    root_objectid	)
+	),
+
+	TP_fast_assign(
+		__entry->ino	= page->mapping->host->i_ino;
+		__entry->index	= page->index;
+		__entry->start	= start;
+		__entry->end	= end;
+		__entry->uptodate = uptodate;
+		__entry->root_objectid	=
+			 BTRFS_I(page->mapping->host)->root->root_key.objectid;
+	),
+
+	TP_printk("root = %llu(%s), ino = %lu, page_index = %lu, start = %llu, "
+		  "end = %llu, uptodate = %d",
+		  show_root_type(__entry->root_objectid),
+		  (unsigned long)__entry->ino, (unsigned long)__entry->index,
+		  (unsigned long long)__entry->start,
+		  (unsigned long long)__entry->end, __entry->uptodate)
+);
+
+TRACE_EVENT(btrfs_sync_file,
+
+	TP_PROTO(struct file *file, int datasync),
+
+	TP_ARGS(file, datasync),
+
+	TP_STRUCT__entry(
+		__field(	ino_t,  ino		)
+		__field(	ino_t,  parent		)
+		__field(	int,    datasync	)
+		__field(	u64,    root_objectid	)
+	),
+
+	TP_fast_assign(
+		struct dentry *dentry = file->f_path.dentry;
+		struct inode *inode = dentry->d_inode;
+
+		__entry->ino		= inode->i_ino;
+		__entry->parent		= dentry->d_parent->d_inode->i_ino;
+		__entry->datasync	= datasync;
+		__entry->root_objectid	=
+				 BTRFS_I(inode)->root->root_key.objectid;
+	),
+
+	TP_printk("root = %llu(%s), ino = %ld, parent = %ld, datasync = %d",
+		  show_root_type(__entry->root_objectid),
+		  (unsigned long)__entry->ino, (unsigned long)__entry->parent,
+		  __entry->datasync)
+);
+
+TRACE_EVENT(btrfs_sync_fs,
+
+	TP_PROTO(int wait),
+
+	TP_ARGS(wait),
+
+	TP_STRUCT__entry(
+		__field(	int,  wait		)
+	),
+
+	TP_fast_assign(
+		__entry->wait	= wait;
+	),
+
+	TP_printk("wait = %d", __entry->wait)
+);
+
+#define show_ref_action(action)						\
+	__print_symbolic(action,					\
+		{ BTRFS_ADD_DELAYED_REF,    "ADD_DELAYED_REF" },	\
+		{ BTRFS_DROP_DELAYED_REF,   "DROP_DELAYED_REF" },	\
+		{ BTRFS_ADD_DELAYED_EXTENT, "ADD_DELAYED_EXTENT" }, 	\
+		{ BTRFS_UPDATE_DELAYED_HEAD, "UPDATE_DELAYED_HEAD" })
+			
+
+TRACE_EVENT(btrfs_delayed_tree_ref,
+
+	TP_PROTO(struct btrfs_delayed_ref_node *ref,
+		 struct btrfs_delayed_tree_ref *full_ref,
+		 int action),
+
+	TP_ARGS(ref, full_ref, action),
+
+	TP_STRUCT__entry(
+		__field(	u64,  bytenr		)
+		__field(	u64,  num_bytes		)
+		__field(	int,  action		) 
+		__field(	u64,  parent		)
+		__field(	u64,  ref_root		)
+		__field(	int,  level		)
+		__field(	int,  type		)
+	),
+
+	TP_fast_assign(
+		__entry->bytenr		= ref->bytenr;
+		__entry->num_bytes	= ref->num_bytes;
+		__entry->action		= action;
+		__entry->parent		= full_ref->parent;
+		__entry->ref_root	= full_ref->root;
+		__entry->level		= full_ref->level;
+		__entry->type		= ref->type;
+	),
+
+	TP_printk("bytenr = %llu, num_bytes = %llu, action = %s, "
+		  "parent = %llu(%s), ref_root = %llu(%s), level = %d, "
+		  "type = %s",
+		  (unsigned long long)__entry->bytenr,
+		  (unsigned long long)__entry->num_bytes,
+		  show_ref_action(__entry->action),
+		  show_root_type(__entry->parent),
+		  show_root_type(__entry->ref_root),
+		  __entry->level, show_ref_type(__entry->type))
+);
+
+TRACE_EVENT(btrfs_delayed_data_ref,
+
+	TP_PROTO(struct btrfs_delayed_ref_node *ref,
+		 struct btrfs_delayed_data_ref *full_ref,
+		 int action),
+
+	TP_ARGS(ref, full_ref, action),
+
+	TP_STRUCT__entry(
+		__field(	u64,  bytenr		)
+		__field(	u64,  num_bytes		)
+		__field(	int,  action		) 
+		__field(	u64,  parent		)
+		__field(	u64,  ref_root		)
+		__field(	u64,  owner		)
+		__field(	u64,  offset		)
+		__field(	int,  type		)
+	),
+
+	TP_fast_assign(
+		__entry->bytenr		= ref->bytenr;
+		__entry->num_bytes	= ref->num_bytes;
+		__entry->action		= action;
+		__entry->parent		= full_ref->parent;
+		__entry->ref_root	= full_ref->root;
+		__entry->owner		= full_ref->objectid;
+		__entry->offset		= full_ref->offset;
+		__entry->type		= ref->type;
+	),
+
+	TP_printk("bytenr = %llu, num_bytes = %llu, action = %s, "
+		  "parent = %llu(%s), ref_root = %llu(%s), owner = %llu, "
+		  "offset = %llu, type = %s",
+		  (unsigned long long)__entry->bytenr,
+		  (unsigned long long)__entry->num_bytes,
+		  show_ref_action(__entry->action),
+		  show_root_type(__entry->parent),
+		  show_root_type(__entry->ref_root),
+		  (unsigned long long)__entry->owner,
+		  (unsigned long long)__entry->offset,
+		  show_ref_type(__entry->type))
+);
+
+TRACE_EVENT(btrfs_delayed_ref_head,
+
+	TP_PROTO(struct btrfs_delayed_ref_node *ref,
+		 struct btrfs_delayed_ref_head *head_ref,
+		 int action),
+
+	TP_ARGS(ref, head_ref, action),
+
+	TP_STRUCT__entry(
+		__field(	u64,  bytenr		)
+		__field(	u64,  num_bytes		)
+		__field(	int,  action		) 
+		__field(	int,  is_data		)
+	),
+
+	TP_fast_assign(
+		__entry->bytenr		= ref->bytenr;
+		__entry->num_bytes	= ref->num_bytes;
+		__entry->action		= action;
+		__entry->is_data	= head_ref->is_data;
+	),
+
+	TP_printk("bytenr = %llu, num_bytes = %llu, action = %s, is_data = %d",
+		  (unsigned long long)__entry->bytenr,
+		  (unsigned long long)__entry->num_bytes,
+		  show_ref_action(__entry->action),
+		  __entry->is_data)
+);
+
+#define show_chunk_type(type)					\
+	__print_flags(type, "|",				\
+		{ BTRFS_BLOCK_GROUP_DATA, 	"DATA"	},	\
+		{ BTRFS_BLOCK_GROUP_SYSTEM, 	"SYSTEM"},	\
+		{ BTRFS_BLOCK_GROUP_METADATA, 	"METADATA"},	\
+		{ BTRFS_BLOCK_GROUP_RAID0, 	"RAID0" },	\
+		{ BTRFS_BLOCK_GROUP_RAID1, 	"RAID1" },	\
+		{ BTRFS_BLOCK_GROUP_DUP, 	"DUP"	},	\
+		{ BTRFS_BLOCK_GROUP_RAID10, 	"RAID10"})
+
+DECLARE_EVENT_CLASS(btrfs__chunk,
+
+	TP_PROTO(struct btrfs_root *root, struct map_lookup *map,
+		 u64 offset, u64 size),
+
+	TP_ARGS(root, map, offset, size),
+
+	TP_STRUCT__entry(
+		__field(	int,  num_stripes		)
+		__field(	u64,  type			)
+		__field(	int,  sub_stripes		)
+		__field(	u64,  offset			)
+		__field(	u64,  size			)
+		__field(	u64,  root_objectid		)
+	),
+
+	TP_fast_assign(
+		__entry->num_stripes	= map->num_stripes;
+		__entry->type		= map->type;
+		__entry->sub_stripes	= map->sub_stripes;
+		__entry->offset		= offset;
+		__entry->size		= size;
+		__entry->root_objectid	= root->root_key.objectid;
+	),
+
+	TP_printk("root = %llu(%s), offset = %llu, size = %llu, "
+		  "num_stripes = %d, sub_stripes = %d, type = %s",
+		  show_root_type(__entry->root_objectid),
+		  (unsigned long long)__entry->offset,
+		  (unsigned long long)__entry->size,
+		  __entry->num_stripes, __entry->sub_stripes,
+		  show_chunk_type(__entry->type))
+);
+
+DEFINE_EVENT(btrfs__chunk,  btrfs_chunk_alloc,
+
+	TP_PROTO(struct btrfs_root *root, struct map_lookup *map,
+		 u64 offset, u64 size),
+
+	TP_ARGS(root, map, offset, size)
+);
+
+DEFINE_EVENT(btrfs__chunk,  btrfs_chunk_free,
+
+	TP_PROTO(struct btrfs_root *root, struct map_lookup *map,
+		 u64 offset, u64 size),
+
+	TP_ARGS(root, map, offset, size)
+);
+
+TRACE_EVENT(btrfs_cow_block,
+
+	TP_PROTO(struct btrfs_root *root, struct extent_buffer *buf,
+		 struct extent_buffer *cow),
+
+	TP_ARGS(root, buf, cow),
+
+	TP_STRUCT__entry(
+		__field(	u64,  root_objectid		)
+		__field(	u64,  buf_start			)
+		__field(	int,  refs			)
+		__field(	u64,  cow_start			)
+		__field(	int,  buf_level			)
+		__field(	int,  cow_level			)
+	),
+
+	TP_fast_assign(
+		__entry->root_objectid	= root->root_key.objectid;
+		__entry->buf_start	= buf->start;
+		__entry->refs		= atomic_read(&buf->refs);
+		__entry->cow_start	= cow->start;
+		__entry->buf_level	= btrfs_header_level(buf);
+		__entry->cow_level	= btrfs_header_level(cow);
+	),
+
+	TP_printk("root = %llu(%s), refs = %d, orig_buf = %llu "
+		  "(orig_level = %d), cow_buf = %llu (cow_level = %d)",
+		  show_root_type(__entry->root_objectid),
+		  __entry->refs,
+		  (unsigned long long)__entry->buf_start,
+		  __entry->buf_level,
+		  (unsigned long long)__entry->cow_start,
+		  __entry->cow_level)
+);
+
+DECLARE_EVENT_CLASS(btrfs__reserved_extent,
+
+	TP_PROTO(struct btrfs_root *root, u64 start, u64 len),
+
+	TP_ARGS(root, start, len),
+
+	TP_STRUCT__entry(
+		__field(	u64,  root_objectid		)
+		__field(	u64,  start			)
+		__field(	u64,  len			)
+	),
+
+	TP_fast_assign(
+		__entry->root_objectid	= root->root_key.objectid;
+		__entry->start		= start;
+		__entry->len		= len;
+	),
+
+	TP_printk("root = %llu(%s), start = %llu, len = %llu",
+		  show_root_type(__entry->root_objectid),
+		  (unsigned long long)__entry->start,
+		  (unsigned long long)__entry->len)
+);
+
+DEFINE_EVENT(btrfs__reserved_extent,  btrfs_reserved_extent_alloc,
+
+	TP_PROTO(struct btrfs_root *root, u64 start, u64 len),
+
+	TP_ARGS(root, start, len)
+);
+
+DEFINE_EVENT(btrfs__reserved_extent,  btrfs_reserved_extent_free,
+
+	TP_PROTO(struct btrfs_root *root, u64 start, u64 len),
+
+	TP_ARGS(root, start, len)
+);
+
+#endif /* _TRACE_BTRFS_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>