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>

5 files changed, 219 insertions, 4 deletions

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 07be88ddb9f8..0b0ba26ba76e 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -25,6 +25,7 @@
 #include "segment.h"
 #include "xattr.h"
 #include "acl.h"
+#include <trace/events/f2fs.h>
 
 static int f2fs_vm_page_mkwrite(struct vm_area_struct *vma,
                                                 struct vm_fault *vmf)
@@ -116,9 +117,12 @@ int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
         if (inode->i_sb->s_flags & MS_RDONLY)
                 return 0;
 
+        trace_f2fs_sync_file_enter(inode);
         ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
-        if (ret)
+        if (ret) {
+                trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
                 return ret;
+        }
 
         /* guarantee free sections for fsync */
         f2fs_balance_fs(sbi);
@@ -153,6 +157,7 @@ int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
         }
 out:
         mutex_unlock(&inode->i_mutex);
+        trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
         return ret;
 }
 
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) ||
diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
index 1dbf11d2bc87..c57fd18b769d 100644
--- a/fs/f2fs/namei.c
+++ b/fs/f2fs/namei.c
@@ -18,6 +18,7 @@
 #include "node.h"
 #include "xattr.h"
 #include "acl.h"
+#include <trace/events/f2fs.h>
 
 static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
 {
@@ -235,6 +236,7 @@ static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
         int err = -ENOENT;
         int ilock;
 
+        trace_f2fs_unlink_enter(dir, dentry);
         f2fs_balance_fs(sbi);
 
         de = f2fs_find_entry(dir, &dentry->d_name, &page);
@@ -255,6 +257,7 @@ static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
         /* In order to evict this inode,  we set it dirty */
         mark_inode_dirty(inode);
 fail:
+        trace_f2fs_unlink_exit(inode, err);
         return err;
 }
 
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 541f21ffd8f2..b015b6cd7bd4 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -29,6 +29,9 @@
 #include "segment.h"
 #include "xattr.h"
 
+#define CREATE_TRACE_POINTS
+#include <trace/events/f2fs.h>
+
 static struct kmem_cache *f2fs_inode_cachep;
 
 enum {
@@ -134,6 +137,8 @@ int f2fs_sync_fs(struct super_block *sb, int sync)
 {
         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 
+        trace_f2fs_sync_fs(sb, sync);
+
         if (!sbi->s_dirty && !get_pages(sbi, F2FS_DIRTY_NODES))
                 return 0;
 
diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h
new file mode 100644
index 000000000000..03bb0dbf468d
--- /dev/null
+++ b/include/trace/events/f2fs.h
@@ -0,0 +1,195 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM f2fs
+
+#if !defined(_TRACE_F2FS_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_F2FS_H
+
+#include <linux/tracepoint.h>
+
+#define show_dev(entry)         MAJOR(entry->dev), MINOR(entry->dev)
+#define show_dev_ino(entry)     show_dev(entry), (unsigned long)entry->ino
+
+DECLARE_EVENT_CLASS(f2fs__inode,
+
+        TP_PROTO(struct inode *inode),
+
+        TP_ARGS(inode),
+
+        TP_STRUCT__entry(
+                __field(dev_t,  dev)
+                __field(ino_t,  ino)
+                __field(ino_t,  pino)
+                __field(umode_t, mode)
+                __field(loff_t, size)
+                __field(unsigned int, nlink)
+                __field(blkcnt_t, blocks)
+                __field(__u8,   advise)
+        ),
+
+        TP_fast_assign(
+                __entry->dev    = inode->i_sb->s_dev;
+                __entry->ino    = inode->i_ino;
+                __entry->pino   = F2FS_I(inode)->i_pino;
+                __entry->mode   = inode->i_mode;
+                __entry->nlink  = inode->i_nlink;
+                __entry->size   = inode->i_size;