[f2fs-dev] [PATCH 1/6] f2fs: add a tracepoint for f2fs_write_begin

[Chao Yu]

This patch adds a tracepoint for f2fs_write_begin to trace write op of user.

Signed-off-by: Chao Yu <chao2...@samsung.com>
---
 fs/f2fs/data.c              |    2 ++
 include/trace/events/f2fs.h |   30 ++++++++++++++++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index a7bb98f..cde0d69 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -900,6 +900,8 @@ static int f2fs_write_begin(struct file *file, struct 
address_space *mapping,
        struct dnode_of_data dn;
        int err = 0;
 
+       trace_f2fs_write_begin(inode, pos, len, flags);
+
        f2fs_balance_fs(sbi);
 repeat:
        err = f2fs_convert_inline_data(inode, pos + len);
diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h
index 67f38fa..1e9375a 100644
--- a/include/trace/events/f2fs.h
+++ b/include/trace/events/f2fs.h
@@ -659,6 +659,36 @@ DEFINE_EVENT_CONDITION(f2fs__submit_bio, 
f2fs_submit_read_bio,
        TP_CONDITION(bio)
 );
 
+TRACE_EVENT(f2fs_write_begin,
+
+       TP_PROTO(struct inode *inode, loff_t pos, unsigned int len,
+                               unsigned int flags),
+
+       TP_ARGS(inode, pos, len, flags),
+
+       TP_STRUCT__entry(
+               __field(dev_t,  dev)
+               __field(ino_t,  ino)
+               __field(loff_t, pos)
+               __field(unsigned int, len)
+               __field(unsigned int, flags)
+       ),
+
+       TP_fast_assign(
+               __entry->dev    = inode->i_sb->s_dev;
+               __entry->ino    = inode->i_ino;
+               __entry->pos    = pos;
+               __entry->len    = len;
+               __entry->flags  = flags;
+       ),
+
+       TP_printk("dev = (%d,%d), ino = %lu, pos = %llu, len = %u, flags = %u",
+               show_dev_ino(__entry),
+               (unsigned long long)__entry->pos,
+               __entry->len,
+               __entry->flags)
+);
+
 DECLARE_EVENT_CLASS(f2fs__page,
 
        TP_PROTO(struct page *page, int type),
-- 
1.7.9.5



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