3 files changed, 36 insertions, 2 deletions
diff --git a/mm/nommu.c b/mm/nommu.c
index c1196812876be9..c10262d68232b1 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1177,3 +1177,10 @@ int in_gate_area_no_task(unsigned long addr)
 {
 	return 0;
 }
+
+struct page *filemap_nopage(struct vm_area_struct *area,
+			unsigned long address, int *type)
+{
+	BUG();
+	return NULL;
+}
diff --git a/mm/shmem.c b/mm/shmem.c
index 65c148efa2ed90..a1f2f02af7246c 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1270,7 +1270,7 @@ out_nomem:
 	return retval;
 }
 
-static int shmem_mmap(struct file *file, struct vm_area_struct *vma)
+int shmem_mmap(struct file *file, struct vm_area_struct *vma)
 {
 	file_accessed(file);
 	vma->vm_ops = &shmem_vm_ops;
diff --git a/mm/tiny-shmem.c b/mm/tiny-shmem.c
index b58abcf44ed658..cdc6d431972b74 100644
--- a/mm/tiny-shmem.c
+++ b/mm/tiny-shmem.c
@@ -81,13 +81,19 @@ struct file *shmem_file_setup(char *name, loff_t size, unsigned long flags)
 		goto close_file;
 
 	d_instantiate(dentry, inode);
-	inode->i_size = size;
 	inode->i_nlink = 0;	/* It is unlinked */
+
 	file->f_vfsmnt = mntget(shm_mnt);
 	file->f_dentry = dentry;
 	file->f_mapping = inode->i_mapping;
 	file->f_op = &ramfs_file_operations;
 	file->f_mode = FMODE_WRITE | FMODE_READ;
+
+	/* notify everyone as to the change of file size */
+	error = do_truncate(dentry, size, file);
+	if (error < 0)
+		goto close_file;
+
 	return file;
 
 close_file:
@@ -123,3 +129,24 @@ int shmem_unuse(swp_entry_t entry, struct page *page)
 {
 	return 0;
 }
+
+int shmem_mmap(struct file *file, struct vm_area_struct *vma)
+{
+	file_accessed(file);
+#ifndef CONFIG_MMU
+	return ramfs_nommu_mmap(file, vma);
+#else
+	return 0;
+#endif
+}
+
+#ifndef CONFIG_MMU
+unsigned long shmem_get_unmapped_area(struct file *file,
+				      unsigned long addr,
+				      unsigned long len,
+				      unsigned long pgoff,
+				      unsigned long flags)
+{
+	return ramfs_nommu_get_unmapped_area(file, addr, len, pgoff, flags);
+}
+#endif