vfs: protect i_nlink

Prevent direct modification of i_nlink by making it const and adding a
non-const __i_nlink alias.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Tested-by: Toshiyuki Okajima <toshi.okajima@jp.fujitsu.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/inode.c b/fs/inode.c
index ecbb68dc7e2a..ee4e66b998f4 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -142,7 +142,7 @@ int inode_init_always(struct super_block *sb, struct inode *inode)
         atomic_set(&inode->i_count, 1);
         inode->i_op = &empty_iops;
         inode->i_fop = &empty_fops;
-        inode->i_nlink = 1;
+        inode->__i_nlink = 1;
         inode->i_opflags = 0;
         inode->i_uid = 0;
         inode->i_gid = 0;