[willy-pagecache:headers 17/18] fs/nfsd/nfs4proc.c:2015:34: error: implicit declaration of function 'filemap_check_wb_err'

[kernel test robot <lkp@intel.com>]

tree:   git://git.infradead.org/users/willy/pagecache headers
head:   33e73a1e8175a4735e962dec9465e64e85d0a63d
commit: 7191691f80efdfec4c2f8d87da800a18b7753e08 [17/18] nfs: Remove pagemap.h from includes
config: arm-randconfig-001-20260814 (https://download.01.org/0day-ci/archive/20260814/202608142324.EKix26tJ-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 16.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260814/202608142324.EKix26tJ-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202608142324.EKix26tJ-lkp@intel.com/

All errors (new ones prefixed by >>):

   fs/nfsd/nfs4proc.c: In function '_nfsd_copy_file_range':
>> fs/nfsd/nfs4proc.c:2015:34: error: implicit declaration of function 'filemap_check_wb_err' [-Wimplicit-function-declaration]
    2015 |                         status = filemap_check_wb_err(dst->f_mapping, since);
         |                                  ^~~~~~~~~~~~~~~~~~~~


vim +/filemap_check_wb_err +2015 fs/nfsd/nfs4proc.c

e0639dc5805a9d Olga Kornievskaia 2018-07-20  1980  
3b7bf5933cada7 Chuck Lever       2022-07-27  1981  static ssize_t _nfsd_copy_file_range(struct nfsd4_copy *copy,
3b7bf5933cada7 Chuck Lever       2022-07-27  1982  				     struct file *dst,
3b7bf5933cada7 Chuck Lever       2022-07-27  1983  				     struct file *src)
e0639dc5805a9d Olga Kornievskaia 2018-07-20  1984  {
555dbf1a9aac6d Trond Myklebust   2021-12-18  1985  	errseq_t since;
e0639dc5805a9d Olga Kornievskaia 2018-07-20  1986  	ssize_t bytes_copied = 0;
e7a833e9cc6c3b J. Bruce Fields   2021-03-18  1987  	u64 bytes_total = copy->cp_count;
e0639dc5805a9d Olga Kornievskaia 2018-07-20  1988  	u64 src_pos = copy->cp_src_pos;
e0639dc5805a9d Olga Kornievskaia 2018-07-20  1989  	u64 dst_pos = copy->cp_dst_pos;
c2f1c4bd206211 Chuck Lever       2021-10-13  1990  	int status;
79a1d88a36f773 Brian Foster      2022-11-16  1991  	loff_t end;
e0639dc5805a9d Olga Kornievskaia 2018-07-20  1992  
792a5112aa90e5 J. Bruce Fields   2021-03-18  1993  	/* See RFC 7862 p.67: */
792a5112aa90e5 J. Bruce Fields   2021-03-18  1994  	if (bytes_total == 0)
792a5112aa90e5 J. Bruce Fields   2021-03-18  1995  		bytes_total = ULLONG_MAX;
20a67a7d18221a Chuck Lever       2026-05-22  1996  	since = READ_ONCE(dst->f_wb_err);
e0639dc5805a9d Olga Kornievskaia 2018-07-20  1997  	do {
fa341560ca7458 NeilBrown         2023-09-11  1998  		/* Only async copies can be stopped here */
e0639dc5805a9d Olga Kornievskaia 2018-07-20  1999  		if (kthread_should_stop())
e0639dc5805a9d Olga Kornievskaia 2018-07-20  2000  			break;
555dbf1a9aac6d Trond Myklebust   2021-12-18  2001  		bytes_copied = nfsd_copy_file_range(src, src_pos, dst, dst_pos,
5c4583b2b78eef Jeff Layton       2019-08-18  2002  						    bytes_total);
e0639dc5805a9d Olga Kornievskaia 2018-07-20  2003  		if (bytes_copied <= 0)
e0639dc5805a9d Olga Kornievskaia 2018-07-20  2004  			break;
e0639dc5805a9d Olga Kornievskaia 2018-07-20  2005  		bytes_total -= bytes_copied;
e0639dc5805a9d Olga Kornievskaia 2018-07-20  2006  		copy->cp_res.wr_bytes_written += bytes_copied;
e0639dc5805a9d Olga Kornievskaia 2018-07-20  2007  		src_pos += bytes_copied;
e0639dc5805a9d Olga Kornievskaia 2018-07-20  2008  		dst_pos += bytes_copied;
1913cdf56cb5bf Chuck Lever       2022-07-27  2009  	} while (bytes_total > 0 && nfsd4_copy_is_async(copy));
eac0b17a77fbd7 Olga Kornievskaia 2021-05-19  2010  	/* for a non-zero asynchronous copy do a commit of data */
1913cdf56cb5bf Chuck Lever       2022-07-27  2011  	if (nfsd4_copy_is_async(copy) && copy->cp_res.wr_bytes_written > 0) {
79a1d88a36f773 Brian Foster      2022-11-16  2012  		end = copy->cp_dst_pos + copy->cp_res.wr_bytes_written - 1;
79a1d88a36f773 Brian Foster      2022-11-16  2013  		status = vfs_fsync_range(dst, copy->cp_dst_pos, end, 0);
555dbf1a9aac6d Trond Myklebust   2021-12-18  2014  		if (!status)
555dbf1a9aac6d Trond Myklebust   2021-12-18 @2015  			status = filemap_check_wb_err(dst->f_mapping, since);
eac0b17a77fbd7 Olga Kornievskaia 2021-05-19  2016  		if (!status)
1913cdf56cb5bf Chuck Lever       2022-07-27  2017  			set_bit(NFSD4_COPY_F_COMMITTED, &copy->cp_flags);
f5cb2276954cb8 Chuck Lever       2026-05-22  2018  		else if (status != -EAGAIN && status != -ESTALE)
f5cb2276954cb8 Chuck Lever       2026-05-22  2019  			nfsd_reset_write_verifier(copy->cp_nn);
eac0b17a77fbd7 Olga Kornievskaia 2021-05-19  2020  	}
e0639dc5805a9d Olga Kornievskaia 2018-07-20  2021  	return bytes_copied;
e0639dc5805a9d Olga Kornievskaia 2018-07-20  2022  }
e0639dc5805a9d Olga Kornievskaia 2018-07-20  2023  

:::::: The code at line 2015 was first introduced by commit
:::::: 555dbf1a9aac6d3150c8b52fa35f768a692f4eeb nfsd: Replace use of rwsem with errseq_t

:::::: TO: Trond Myklebust <trond.myklebust@hammerspace.com>
:::::: CC: Chuck Lever <chuck.lever@oracle.com>

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