Re: [PATCH -next,v2] NFS: report and clear ENOSPC/EFBIG/EDQUOT writeback error on close() file

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

Hi ChenXiaoSong,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on v5.19-rc2]
[also build test WARNING on next-20220614]
[cannot apply to trondmy-nfs/linux-next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/intel-lab-lkp/linux/commits/ChenXiaoSong/NFS-report-and-clear-ENOSPC-EFBIG-EDQUOT-writeback-error-on-close-file/20220614-231738
base:    b13baccc3850ca8b8cccbf8ed9912dbaa0fdf7f3
config: x86_64-rhel-8.3-func (https://download.01.org/0day-ci/archive/20220615/202206150903.fMetZz83-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/f65252667ed27ca5a3e7f2182d1819d009dc98d7
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review ChenXiaoSong/NFS-report-and-clear-ENOSPC-EFBIG-EDQUOT-writeback-error-on-close-file/20220614-231738
        git checkout f65252667ed27ca5a3e7f2182d1819d009dc98d7
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash fs/nfs/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   fs/nfs/nfs4file.c: In function 'nfs4_file_flush':
>> fs/nfs/nfs4file.c:137:17: warning: ignoring return value of 'file_check_and_advance_wb_err' declared with attribute 'warn_unused_result' [-Wunused-result]
     137 |                 file_check_and_advance_wb_err(file);
         |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +137 fs/nfs/nfs4file.c

   108	
   109	/*
   110	 * Flush all dirty pages, and check for write errors.
   111	 */
   112	static int
   113	nfs4_file_flush(struct file *file, fl_owner_t id)
   114	{
   115		struct inode	*inode = file_inode(file);
   116		errseq_t since, error;
   117	
   118		dprintk("NFS: flush(%pD2)\n", file);
   119	
   120		nfs_inc_stats(inode, NFSIOS_VFSFLUSH);
   121		if ((file->f_mode & FMODE_WRITE) == 0)
   122			return 0;
   123	
   124		/*
   125		 * If we're holding a write delegation, then check if we're required
   126		 * to flush the i/o on close. If not, then just start the i/o now.
   127		 */
   128		if (!nfs4_delegation_flush_on_close(inode))
   129			return filemap_fdatawrite(file->f_mapping);
   130	
   131		/* Flush writes to the server and return any errors */
   132		since = filemap_sample_wb_err(file->f_mapping);
   133		nfs_wb_all(inode);
   134		error = filemap_check_wb_err(file->f_mapping, since);
   135	
   136		if (nfs_should_clear_wb_err(error))
 > 137			file_check_and_advance_wb_err(file);
   138	
   139		return error;
   140	}
   141	

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