linux-kernel - [RFC PATCH] hugetlbfs: fix the hugetlbfs can not be mounted

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Date:   Sat, 29 Oct 2016 14:08:31 +0800
From:   zhongjiang <zhongjiang@...wei.com>
To:     <nyc@...omorphy.com>, <n-horiguchi@...jp.nec.com>,
        <mike.kravetz@...cle.com>, <rientjes@...gle.com>,
        <hillf.zj@...baba-inc.com>, <akpm@...ux-foundation.org>
CC:     <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>
Subject: [RFC PATCH] hugetlbfs: fix the hugetlbfs can not be mounted

From: zhong jiang <zhongjiang@...wei.com>

Since 'commit 3e89e1c5ea84 ("hugetlb: make mm and fs code explicitly non-modular")'
bring in the mainline. mount hugetlbfs will result in the following issue.

mount: unknown filesystme type 'hugetlbfs'

because previous patch remove the module_alias_fs, when we mount the fs type,
the caller get_fs_type can not find the filesystem.

The patch just recover the module_alias_fs to identify the hugetlbfs.

Signed-off-by: zhong jiang <zhongjiang@...wei.com>
---
 fs/hugetlbfs/inode.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 4fb7b10..b63e7de 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -35,6 +35,7 @@
 #include <linux/security.h>
 #include <linux/magic.h>
 #include <linux/migrate.h>
+#include <linux/module.h>
 #include <linux/uio.h>
 
 #include <asm/uaccess.h>
@@ -1209,6 +1210,7 @@ static struct dentry *hugetlbfs_mount(struct file_system_type *fs_type,
 	.mount		= hugetlbfs_mount,
 	.kill_sb	= kill_litter_super,
 };
+MODULE_ALIAS_FS("hugetlbfs");
 
 static struct vfsmount *hugetlbfs_vfsmount[HUGE_MAX_HSTATE];
 
-- 
1.8.3.1