ext4: Add debugging markers that can be used by systemtap

[linux-2.6-omap-h63xx.git] / fs / ext4 / fsync.c

diff --git a/fs/ext4/fsync.c b/fs/ext4/fsync.c
index 1c8ba48d4f8d6014e5708b44706640e3e29a11e9..5afe4370840b2b0b7c683a7d738baf648eae533b 100644 (file)
--- a/fs/ext4/fsync.c
+++ b/fs/ext4/fsync.c
@@ -27,6 +27,8 @@
 #include <linux/sched.h>
 #include <linux/writeback.h>
 #include <linux/jbd2.h>
+#include <linux/blkdev.h>
+#include <linux/marker.h>
 #include "ext4.h"
 #include "ext4_jbd2.h"
 
@@ -42,13 +44,18 @@
  * inode to disk.
  */
 
-int ext4_sync_file(struct file * file, struct dentry *dentry, int datasync)
+int ext4_sync_file(struct file *file, struct dentry *dentry, int datasync)
 {
        struct inode *inode = dentry->d_inode;
+       journal_t *journal = EXT4_SB(inode->i_sb)->s_journal;
        int ret = 0;
 
        J_ASSERT(ext4_journal_current_handle() == NULL);
 
+       trace_mark(ext4_sync_file, "dev %s datasync %d ino %ld parent %ld",
+                  inode->i_sb->s_id, datasync, inode->i_ino,
+                  dentry->d_parent->d_inode->i_ino);
+
        /*
         * data=writeback:
         *  The caller's filemap_fdatawrite()/wait will sync the data.
@@ -85,6 +92,8 @@ int ext4_sync_file(struct file * file, struct dentry *dentry, int datasync)
                        .nr_to_write = 0, /* sys_fsync did this */
                };
                ret = sync_inode(inode, &wbc);
+               if (journal && (journal->j_flags & JBD2_BARRIER))
+                       blkdev_issue_flush(inode->i_sb->s_bdev, NULL);
        }
 out:
        return ret;