Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block

[pandora-kernel.git] / fs / sync.c

diff --git a/fs/sync.c b/fs/sync.c
index 412dc89..c38ec16 100644 (file)
--- a/fs/sync.c
+++ b/fs/sync.c
@@ -7,6 +7,7 @@
 #include <linux/fs.h>
 #include <linux/slab.h>
 #include <linux/module.h>
+#include <linux/namei.h>
 #include <linux/sched.h>
 #include <linux/writeback.h>
 #include <linux/syscalls.h>
@@ -128,6 +129,29 @@ void emergency_sync(void)
        }
 }
 
+/*
+ * sync a single super
+ */
+SYSCALL_DEFINE1(syncfs, int, fd)
+{
+       struct file *file;
+       struct super_block *sb;
+       int ret;
+       int fput_needed;
+
+       file = fget_light(fd, &fput_needed);
+       if (!file)
+               return -EBADF;
+       sb = file->f_dentry->d_sb;
+
+       down_read(&sb->s_umount);
+       ret = sync_filesystem(sb);
+       up_read(&sb->s_umount);
+
+       fput_light(file, fput_needed);
+       return ret;
+}
+
 /**
  * vfs_fsync_range - helper to sync a range of data & metadata to disk
  * @file:              file to sync