lift sb_start_write() out of ->write()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/coda/file.c b/fs/coda/file.c
index fa4c100..380b798 100644
--- a/fs/coda/file.c
+++ b/fs/coda/file.c
@@ -79,6 +79,7 @@
 		return -EINVAL;
 
 	host_inode = file_inode(host_file);
+	file_start_write(host_file);
 	mutex_lock(&coda_inode->i_mutex);
 
 	ret = host_file->f_op->write(host_file, buf, count, ppos);
@@ -87,6 +88,7 @@
 	coda_inode->i_blocks = (coda_inode->i_size + 511) >> 9;
 	coda_inode->i_mtime = coda_inode->i_ctime = CURRENT_TIME_SEC;
 	mutex_unlock(&coda_inode->i_mutex);
+	file_end_write(host_file);
 
 	return ret;
 }