Hi Qu,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v5.1-rc4 next-20190410]
[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/Qu-Wenruo/errno-h-Export-EFSCORRUPTED-error-number/20190410-183556
config: sparc64-allyesconfig (attached as .config)
compiler: sparc64-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=7.2.0 make.cross ARCH=sparc64 

All errors (new ones prefixed by >>):

>> block/blk-core.c:138:29: error: 'EFSCORRUPTED' undeclared here (not in a function); did you mean 'FS_NRSUPER'?
     [BLK_STS_FSCORRUPTED] = { -EFSCORRUPTED, "filesystem is corrupted" },
                                ^~~~~~~~~~~~
                                FS_NRSUPER

vim +138 block/blk-core.c

   121	
   122	static const struct {
   123		int		errno;
   124		const char	*name;
   125	} blk_errors[] = {
   126		[BLK_STS_OK]		= { 0,		"" },
   127		[BLK_STS_NOTSUPP]	= { -EOPNOTSUPP, "operation not supported" },
   128		[BLK_STS_TIMEOUT]	= { -ETIMEDOUT,	"timeout" },
   129		[BLK_STS_NOSPC]		= { -ENOSPC,	"critical space allocation" },
   130		[BLK_STS_TRANSPORT]	= { -ENOLINK,	"recoverable transport" },
   131		[BLK_STS_TARGET]	= { -EREMOTEIO,	"critical target" },
   132		[BLK_STS_NEXUS]		= { -EBADE,	"critical nexus" },
   133		[BLK_STS_MEDIUM]	= { -ENODATA,	"critical medium" },
   134		[BLK_STS_PROTECTION]	= { -EILSEQ,	"protection" },
   135		[BLK_STS_RESOURCE]	= { -ENOMEM,	"kernel resource" },
   136		[BLK_STS_DEV_RESOURCE]	= { -EBUSY,	"device resource" },
   137		[BLK_STS_AGAIN]		= { -EAGAIN,	"nonblocking retry" },
 > 138		[BLK_STS_FSCORRUPTED]	= { -EFSCORRUPTED, "filesystem is corrupted" },
   139	
   140		/* device mapper special case, should not leak out: */
   141		[BLK_STS_DM_REQUEUE]	= { -EREMCHG, "dm internal retry" },
   142	
   143		/* everything else not covered above: */
   144		[BLK_STS_IOERR]		= { -EIO,	"I/O" },
   145	};
   146	

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