[PATCH 18/18] btrfs: trace functions for btrfs_iomap_begin/end

[Goldwyn Rodrigues <rgoldwyn@xxxxxxx>]

From: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx>

This is for debug purposes only and can be skipped.

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx>
---
 fs/btrfs/dax.c               |  3 +++
 include/trace/events/btrfs.h | 56 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 59 insertions(+)

diff --git a/fs/btrfs/dax.c b/fs/btrfs/dax.c
index 20ec2ec49c68..3fee28f5a199 100644
--- a/fs/btrfs/dax.c
+++ b/fs/btrfs/dax.c
@@ -104,6 +104,8 @@ static int btrfs_iomap_begin(struct inode *inode, loff_t pos,
 	u64 srcblk = 0;
 	loff_t diff;
 
+	trace_btrfs_iomap_begin(inode, pos, length, flags);
+
 	em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, pos, length, 0);
 
 	iomap->type = IOMAP_MAPPED;
@@ -164,6 +166,7 @@ static int btrfs_iomap_end(struct inode *inode, loff_t pos,
 {
 	struct btrfs_iomap *bi = iomap->private;
 	u64 wend;
+	trace_btrfs_iomap_end(inode, pos, length, written, flags);
 
 	if (!bi)
 		return 0;
diff --git a/include/trace/events/btrfs.h b/include/trace/events/btrfs.h
index ab1cc33adbac..8779e5789a7c 100644
--- a/include/trace/events/btrfs.h
+++ b/include/trace/events/btrfs.h
@@ -1850,6 +1850,62 @@ DEFINE_EVENT(btrfs__block_group, btrfs_skip_unused_block_group,
 	TP_ARGS(bg_cache)
 );
 
+TRACE_EVENT(btrfs_iomap_begin,
+
+	TP_PROTO(const struct inode *inode, loff_t pos, loff_t length, int flags),
+
+	TP_ARGS(inode, pos, length, flags),
+
+	TP_STRUCT__entry_btrfs(
+		__field(	u64,	ino		)
+		__field(	u64,	pos		)
+		__field(	u64,	length		)
+		__field(	int,    flags		)
+	),
+
+	TP_fast_assign_btrfs(btrfs_sb(inode->i_sb),
+		__entry->ino		= btrfs_ino(BTRFS_I(inode));
+		__entry->pos		= pos;
+		__entry->length		= length;
+		__entry->flags		= flags;
+	),
+
+	TP_printk_btrfs("ino=%llu pos=%llu len=%llu flags=0x%x",
+		  __entry->ino,
+		  __entry->pos,
+		  __entry->length,
+		  __entry->flags)
+);
+
+TRACE_EVENT(btrfs_iomap_end,
+
+	TP_PROTO(const struct inode *inode, loff_t pos, loff_t length, loff_t written, int flags),
+
+	TP_ARGS(inode, pos, length, written, flags),
+
+	TP_STRUCT__entry_btrfs(
+		__field(	u64,	ino		)
+		__field(	u64,	pos		)
+		__field(	u64,	length		)
+		__field(	u64,	written		)
+		__field(	int,    flags		)
+	),
+
+	TP_fast_assign_btrfs(btrfs_sb(inode->i_sb),
+		__entry->ino		= btrfs_ino(BTRFS_I(inode));
+		__entry->pos		= pos;
+		__entry->length		= length;
+		__entry->written		= written;
+		__entry->flags		= flags;
+	),
+
+	TP_printk_btrfs("ino=%llu pos=%llu len=%llu written=%llu flags=0x%x",
+		  __entry->ino,
+		  __entry->pos,
+		  __entry->length,
+		  __entry->written,
+		  __entry->flags)
+);
 #endif /* _TRACE_BTRFS_H */
 
 /* This part must be outside protection */
-- 
2.16.4