f2fs: add tracepoints for sync & inode operations

Add tracepoints in f2fs for tracing the syncing
operations like filesystem sync, file sync enter/exit.
It will helf to trace the code under debugging scenarios.

Also add tracepoints for tracing the various inode operations
like building inode, eviction of inode, link/unlike of
inodes.

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>
[Jaegeuk: combine and modify the tracepoint structures]
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

1 files changed, 10 insertions, 3 deletions

diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
index 60105b710958..91ac7f9d88ee 100644
--- a/fs/f2fs/inode.c
+++ b/fs/f2fs/inode.c
@@ -16,6 +16,8 @@
 #include "f2fs.h"
 #include "node.h"
 
+#include <trace/events/f2fs.h>
+
 void f2fs_set_inode_flags(struct inode *inode)
 {
         unsigned int flags = F2FS_I(inode)->i_flags;
@@ -91,13 +93,16 @@ struct inode *f2fs_iget(struct super_block *sb, unsigned long ino)
 {
         struct f2fs_sb_info *sbi = F2FS_SB(sb);
         struct inode *inode;
-        int ret;
+        int ret = 0;
 
         inode = iget_locked(sb, ino);
         if (!inode)
                 return ERR_PTR(-ENOMEM);
-        if (!(inode->i_state & I_NEW))
+
+        if (!(inode->i_state & I_NEW)) {
+                trace_f2fs_iget(inode);
                 return inode;
+        }
         if (ino == F2FS_NODE_INO(sbi) || ino == F2FS_META_INO(sbi))
                 goto make_now;
 
@@ -139,11 +144,12 @@ make_now:
                 goto bad_inode;
         }
         unlock_new_inode(inode);
-
+        trace_f2fs_iget(inode);
         return inode;
 
 bad_inode:
         iget_failed(inode);
+        trace_f2fs_iget_exit(inode, ret);
         return ERR_PTR(ret);
 }
 
@@ -239,6 +245,7 @@ void f2fs_evict_inode(struct inode *inode)
         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
         int ilock;
 
+        trace_f2fs_evict_inode(inode);
         truncate_inode_pages(&inode->i_data, 0);
 
         if (inode->i_ino == F2FS_NODE_INO(sbi) ||