ext4: add tracepoint for ext4_forget()

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 554c6798597c..13de1dd751f5 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -89,6 +89,7 @@ int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
 
         might_sleep();
 
+        trace_ext4_forget(inode, is_metadata, blocknr);
         BUFFER_TRACE(bh, "enter");
 
         jbd_debug(4, "forgetting bh %p: is_metadata = %d, mode %o, "
diff --git a/include/trace/events/ext4.h b/include/trace/events/ext4.h
index d09550bf3f95..b390e1fc4a7b 100644
--- a/include/trace/events/ext4.h
+++ b/include/trace/events/ext4.h
@@ -907,6 +907,32 @@ TRACE_EVENT(ext4_mballoc_free,
                   __entry->result_len, __entry->result_logical)
 );
 
+TRACE_EVENT(ext4_forget,
+        TP_PROTO(struct inode *inode, int is_metadata, __u64 block),
+
+        TP_ARGS(inode, is_metadata, block),
+
+        TP_STRUCT__entry(
+                __field(        dev_t,  dev                     )
+                __field(        ino_t,  ino                     )
+                __field(        umode_t, mode                   )
+                __field(        int,    is_metadata             )
+                __field(        __u64,  block                   )
+        ),
+
+        TP_fast_assign(
+                __entry->dev    = inode->i_sb->s_dev;
+                __entry->ino    = inode->i_ino;
+                __entry->mode   = inode->i_mode;
+                __entry->is_metadata = is_metadata;
+                __entry->block  = block;
+        ),
+
+        TP_printk("dev %s ino %lu mode %d is_metadata %d block %llu",
+                  jbd2_dev_to_name(__entry->dev), (unsigned long) __entry->ino,
+                  __entry->mode, __entry->is_metadata, __entry->block)
+);
+
 #endif /* _TRACE_EXT4_H */
 
 /* This part must be outside protection */