ext4: add tracepoint in punching hole

This patch adds a tracepoint in ext4_punch_hole.

CC: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: Zheng Liu <wenqing.lz@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

2 files changed, 27 insertions, 0 deletions

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 93a7e8453a68..5abf89c100b9 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3567,6 +3567,8 @@ int ext4_punch_hole(struct file *file, loff_t offset, loff_t length)
                 return -EOPNOTSUPP;
         }
 
+        trace_ext4_punch_hole(inode, offset, length);
+
         return ext4_ext_punch_hole(file, offset, length);
 }
 
diff --git a/include/trace/events/ext4.h b/include/trace/events/ext4.h
index 7e8c36bc7082..6080ea1380b8 100644
--- a/include/trace/events/ext4.h
+++ b/include/trace/events/ext4.h
@@ -1324,6 +1324,31 @@ TRACE_EVENT(ext4_fallocate_exit,
                   __entry->ret)
 );
 
+TRACE_EVENT(ext4_punch_hole,
+        TP_PROTO(struct inode *inode, loff_t offset, loff_t len),
+
+        TP_ARGS(inode, offset, len),
+
+        TP_STRUCT__entry(
+                __field(        dev_t,  dev                     )
+                __field(        ino_t,  ino                     )
+                __field(        loff_t, offset                  )
+                __field(        loff_t, len                     )
+        ),
+
+        TP_fast_assign(
+                __entry->dev    = inode->i_sb->s_dev;
+                __entry->ino    = inode->i_ino;
+                __entry->offset = offset;
+                __entry->len    = len;
+        ),
+
+        TP_printk("dev %d,%d ino %lu offset %lld len %lld",
+                  MAJOR(__entry->dev), MINOR(__entry->dev),
+                  (unsigned long) __entry->ino,
+                  __entry->offset, __entry->len)
+);
+
 TRACE_EVENT(ext4_unlink_enter,
         TP_PROTO(struct inode *parent, struct dentry *dentry),