Re: [PATCH] f2fs: don't allow volatile writes for non-regular file

[kbuild test robot]

Hi Chao,

[auto build test WARNING on f2fs/dev]
[also build test WARNING on v4.11-rc2 next-20170310]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Chao-Yu/f2fs-don-t-allow-volatile-writes-for-non-regular-file/20170319-221605
base:   https://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs.git dev
reproduce:
        # apt-get install sparse
        make ARCH=x86_64 allmodconfig
        make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

   include/linux/compiler.h:264:8: sparse: attribute 'no_sanitize_address': unknown attribute
>> fs/f2fs/file.c:1598:14: sparse: incompatible types for operation (&)
   fs/f2fs/file.c:1598:14:    left side has type struct inode *inode
   fs/f2fs/file.c:1598:14:    right side has type int
   fs/f2fs/file.c:1598:14: sparse: incompatible types for operation (==)
   fs/f2fs/file.c:1598:14:    left side has type bad type
   fs/f2fs/file.c:1598:14:    right side has type int
   In file included from include/linux/stat.h:6:0,
                    from include/linux/fs.h:9,
                    from fs/f2fs/file.c:11:
   fs/f2fs/file.c: In function 'f2fs_ioc_start_volatile_write':
   include/uapi/linux/stat.h:20:26: error: invalid operands to binary & (have 'struct inode *' and 'int')
    #define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
                             ^
   fs/f2fs/file.c:1598:7: note: in expansion of macro 'S_ISREG'
     if (!S_ISREG(inode))
          ^~~~~~~

vim +1598 fs/f2fs/file.c

  1582			ret = f2fs_do_sync_file(filp, 0, LLONG_MAX, 0, true);
  1583		}
  1584	err_out:
  1585		inode_unlock(inode);
  1586		mnt_drop_write_file(filp);
  1587		return ret;
  1588	}
  1589	
  1590	static int f2fs_ioc_start_volatile_write(struct file *filp)
  1591	{
  1592		struct inode *inode = file_inode(filp);
  1593		int ret;
  1594	
  1595		if (!inode_owner_or_capable(inode))
  1596			return -EACCES;
  1597	
> 1598		if (!S_ISREG(inode))
  1599			return -EINVAL;
  1600	
  1601		ret = mnt_want_write_file(filp);
  1602		if (ret)
  1603			return ret;
  1604	
  1605		inode_lock(inode);
  1606	

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