[PATCH] tmpfs 3/6: use generic_file_llseek

From: Hugh Dickins <hugh@veritas.com>

default_llseek's use of BKL and not i_sem was recently exposed:
tmpfs should be using generic_file_llseek which guards with i_sem.

mm/shmem.c

@@ -1749,6 +1749,7 @@ static struct address_space_operations shmem_aops = {
 static struct file_operations shmem_file_operations = {
 	.mmap		= shmem_mmap,
 #ifdef CONFIG_TMPFS
+	.llseek		= generic_file_llseek,
 	.read		= shmem_file_read,
 	.write		= shmem_file_write,
 	.fsync		= simple_sync_file,