[PATCH v4 5/7] f2fs: add tracepoints to debug the block allocation & fallocate

[Namjae Jeon <linkinjeon@gmail.com>]

From: Namjae Jeon <namjae.jeon@samsung.com>

Add tracepoints to debug the block allocation & fallocate.

Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Pankaj Kumar <pankaj.km@samsung.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
---
 fs/f2fs/data.c              |    1 +
 fs/f2fs/file.c              |    6 ++++-
 include/trace/events/f2fs.h |   59 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 65 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 394ab68..503b5bf 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -56,6 +56,7 @@ int reserve_new_block(struct dnode_of_data *dn)
 	if (!inc_valid_block_count(sbi, dn->inode, 1))
 		return -ENOSPC;
 
+	trace_f2fs_reserve_new_block(dn->inode, dn->nid, dn->ofs_in_node);
 	__set_data_blkaddr(dn, NEW_ADDR);
 	dn->data_blkaddr = NEW_ADDR;
 	sync_inode_page(dn);
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 31176d5..64eeb5a 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -532,8 +532,10 @@ static long f2fs_fallocate(struct file *file, int mode,
 	struct inode *inode = file_inode(file);
 	long ret;
 
-	if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
+	if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) {
+		trace_f2fs_fallocate(inode, offset, len, mode, -EOPNOTSUPP);
 		return -EOPNOTSUPP;
+	}
 
 	if (mode & FALLOC_FL_PUNCH_HOLE)
 		ret = punch_hole(inode, offset, len, mode);
@@ -544,6 +546,8 @@ static long f2fs_fallocate(struct file *file, int mode,
 		inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 		mark_inode_dirty(inode);
 	}
+
+	trace_f2fs_fallocate(inode, offset, len, mode, ret);
 	return ret;
 }
 
diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h
index 57b6487..cf1bcdf8 100644
--- a/include/trace/events/f2fs.h
+++ b/include/trace/events/f2fs.h
@@ -509,6 +509,65 @@ TRACE_EVENT(f2fs_get_victim,
 			__entry->victim)
 );
 
+TRACE_EVENT(f2fs_fallocate,
+	TP_PROTO(struct inode *inode, loff_t offset, loff_t len,
+						 int mode, int ret),
+
+	TP_ARGS(inode, offset, len, mode, ret),
+
+	TP_STRUCT__entry(
+		__field(dev_t,	dev)
+		__field(ino_t,	ino)
+		__field(loff_t,	pos)
+		__field(loff_t,	len)
+		__field(int,	mode)
+		__field(blkcnt_t, blocks)
+		__field(loff_t, size)
+		__field(int,	ret)
+	),
+
+	TP_fast_assign(
+		__entry->dev	= inode->i_sb->s_dev;
+		__entry->ino	= inode->i_ino;
+		__entry->pos	= offset;
+		__entry->len	= len;
+		__entry->mode	= mode;
+		__entry->blocks = inode->i_blocks;
+		__entry->size	= inode->i_size;
+		__entry->ret	= ret;
+	),
+
+	TP_printk("dev %d,%d ino %lu pos %lld len %lld mode %d block %llu"
+			"Size %lld ret %d",
+		  MAJOR(__entry->dev), MINOR(__entry->dev),
+		  (unsigned long) __entry->ino, __entry->pos,
+		  __entry->len, __entry->mode,
+			 (unsigned long long)__entry->blocks, __entry->size,
+			__entry->ret)
+);
+
+TRACE_EVENT(f2fs_reserve_new_block,
+	TP_PROTO(struct inode *inode, unsigned int nid, unsigned int ofs_node),
+
+	TP_ARGS(inode, nid, ofs_node),
+
+	TP_STRUCT__entry(
+		__field(dev_t,	dev)
+		__field(unsigned int, nid)
+		__field(unsigned int, ofs_node)
+	),
+
+	TP_fast_assign(
+		__entry->dev	= inode->i_sb->s_dev;
+		__entry->nid	= nid;
+		__entry->ofs_node = ofs_node;
+	),
+
+	TP_printk("dev %d,%d: with Nid %u Node page offset %u",
+		  MAJOR(__entry->dev), MINOR(__entry->dev),
+		   __entry->nid, __entry->ofs_node)
+);
+
 #endif /* _TRACE_F2FS_H */
 
  /* This part must be outside protection */
-- 
1.7.9.5