[PATCH] ufs: fsync implementation

Presently ufs doesn't support "fsync", this make some applications unhappy,
for example vim.  This patch fixes this situation.
Signed-off-by: Evgeniy Dushistov <dushistov@mail.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/ufs/file.c

@@ -25,6 +25,26 @@
 
 #include <linux/fs.h>
 #include <linux/ufs_fs.h>
+#include <linux/buffer_head.h>	/* for sync_mapping_buffers() */
+
+static int ufs_sync_file(struct file *file, struct dentry *dentry, int datasync)
+{
+	struct inode *inode = dentry->d_inode;
+	int err;
+	int ret;
+
+	ret = sync_mapping_buffers(inode->i_mapping);
+	if (!(inode->i_state & I_DIRTY))
+		return ret;
+	if (datasync && !(inode->i_state & I_DIRTY_DATASYNC))
+		return ret;
+
+	err = ufs_sync_inode(inode);
+	if (ret == 0)
+		ret = err;
+	return ret;
+}
+
 
 /*
  * We have mostly NULL's here: the current defaults are ok for
@@ -37,6 +57,7 @@ const struct file_operations ufs_file_operations = {
 	.write		= generic_file_write,
 	.mmap		= generic_file_mmap,
 	.open           = generic_file_open,
+	.fsync		= ufs_sync_file,
 	.sendfile	= generic_file_sendfile,
 };