linux-ext4 - [ext4:nls 20/47] fs/ext4/super.c:931:38: error: 'struct ext4_sb_info' has no member named 's_qf

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Date:   Mon, 8 Oct 2018 23:10:58 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Theodore Ts'o <tytso@....edu>
Cc:     kbuild-all@...org, linux-ext4@...r.kernel.org
Subject: [ext4:nls 20/47] fs/ext4/super.c:931:38: error: 'struct
 ext4_sb_info' has no member named 's_qf_names'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git nls
head:   82e650bbf0fe816841c219b7ba7feec601d1f47b
commit: cc1ee227e8906d1434da440e5b8267fc4b928590 [20/47] ext4: fix use-after-free race in ext4_remount()'s error path
config: x86_64-randconfig-u0-10082224 (attached as .config)
compiler: gcc-5 (Debian 5.5.0-3) 5.4.1 20171010
reproduce:
        git checkout cc1ee227e8906d1434da440e5b8267fc4b928590
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   In file included from include/linux/srcu.h:33:0,
                    from include/linux/notifier.h:16,
                    from include/linux/memory_hotplug.h:7,
                    from include/linux/mmzone.h:758,
                    from include/linux/gfp.h:6,
                    from include/linux/umh.h:4,
                    from include/linux/kmod.h:22,
                    from include/linux/module.h:13,
                    from fs/ext4/super.c:20:
   fs/ext4/super.c: In function 'get_qf_name':
>> fs/ext4/super.c:931:38: error: 'struct ext4_sb_info' has no member named 's_qf_names'
     return rcu_dereference_protected(sbi->s_qf_names[type],
                                         ^
   include/linux/rcupdate.h:358:12: note: in definition of macro '__rcu_dereference_protected'
     ((typeof(*p) __force __kernel *)(p)); \
               ^
   fs/ext4/super.c:931:9: note: in expansion of macro 'rcu_dereference_protected'
     return rcu_dereference_protected(sbi->s_qf_names[type],
            ^
>> fs/ext4/super.c:931:38: error: 'struct ext4_sb_info' has no member named 's_qf_names'
     return rcu_dereference_protected(sbi->s_qf_names[type],
                                         ^
   include/linux/rcupdate.h:358:35: note: in definition of macro '__rcu_dereference_protected'
     ((typeof(*p) __force __kernel *)(p)); \
                                      ^
   fs/ext4/super.c:931:9: note: in expansion of macro 'rcu_dereference_protected'
     return rcu_dereference_protected(sbi->s_qf_names[type],
            ^
   fs/ext4/super.c: In function 'parse_options':
   fs/ext4/super.c:1976:26: warning: unused variable 'grp_qf_name' [-Wunused-variable]
     char *p, *usr_qf_name, *grp_qf_name;
                             ^
   fs/ext4/super.c:1976:12: warning: unused variable 'usr_qf_name' [-Wunused-variable]
     char *p, *usr_qf_name, *grp_qf_name;
               ^

vim +931 fs/ext4/super.c

   922	
   923	/*
   924	 * This is a helper function which is used in the mount/remount
   925	 * codepaths (which holds s_umount) to fetch the quota file name.
   926	 */
   927	static inline char *get_qf_name(struct super_block *sb,
   928					struct ext4_sb_info *sbi,
   929					int type)
   930	{
 > 931		return rcu_dereference_protected(sbi->s_qf_names[type],
   932						 lockdep_is_held(&sb->s_umount));
   933	}
   934	

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