Re: [PATCH v2] BTRFS/NFSD: provide more unique inode number for btrfs export

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

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Hi NeilBrown,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on nfs/linux-next]
[also build test ERROR on hch-configfs/for-next linus/master v5.14-rc7 next-20210820]
[cannot apply to kdave/for-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/0day-ci/linux/commits/NeilBrown/BTRFS-NFSD-provide-more-unique-inode-number-for-btrfs-export/20210823-120718
base:   git://git.linux-nfs.org/projects/trondmy/linux-nfs.git linux-next
config: hexagon-randconfig-r045-20210822 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 79b55e5038324e61a3abf4e6a9a949c473edd858)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/e99ff00e4055532e35c592b50809761d82f87595
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review NeilBrown/BTRFS-NFSD-provide-more-unique-inode-number-for-btrfs-export/20210823-120718
        git checkout e99ff00e4055532e35c592b50809761d82f87595
        # save the attached .config to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross O=build_dir ARCH=hexagon SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

>> fs/nfsd/nfsfh.c:593:44: error: use of undeclared identifier 'BTRFS_SUPER_MAGIC'
                   if (exp->ex_path.mnt->mnt_sb->s_magic == BTRFS_SUPER_MAGIC)
                                                            ^
>> fs/nfsd/nfsfh.c:593:44: error: use of undeclared identifier 'BTRFS_SUPER_MAGIC'
>> fs/nfsd/nfsfh.c:593:44: error: use of undeclared identifier 'BTRFS_SUPER_MAGIC'
   3 errors generated.


vim +/BTRFS_SUPER_MAGIC +593 fs/nfsd/nfsfh.c

   557	
   558	__be32
   559	fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry,
   560		   struct svc_fh *ref_fh)
   561	{
   562		/* ref_fh is a reference file handle.
   563		 * if it is non-null and for the same filesystem, then we should compose
   564		 * a filehandle which is of the same version, where possible.
   565		 * Currently, that means that if ref_fh->fh_handle.fh_version == 0xca
   566		 * Then create a 32byte filehandle using nfs_fhbase_old
   567		 *
   568		 */
   569	
   570		struct inode * inode = d_inode(dentry);
   571		dev_t ex_dev = exp_sb(exp)->s_dev;
   572		u8 options = 0;
   573	
   574		dprintk("nfsd: fh_compose(exp %02x:%02x/%ld %pd2, ino=%ld)\n",
   575			MAJOR(ex_dev), MINOR(ex_dev),
   576			(long) d_inode(exp->ex_path.dentry)->i_ino,
   577			dentry,
   578			(inode ? inode->i_ino : 0));
   579	
   580		/* Choose filehandle version and fsid type based on
   581		 * the reference filehandle (if it is in the same export)
   582		 * or the export options.
   583		 */
   584		set_version_and_fsid_type(fhp, exp, ref_fh);
   585	
   586		/* If we have a ref_fh, then copy the fh_no_wcc setting from it. */
   587		fhp->fh_no_wcc = ref_fh ? ref_fh->fh_no_wcc : false;
   588	
   589		if (ref_fh && ref_fh->fh_export == exp) {
   590			options = ref_fh->fh_handle.fh_options;
   591		} else {
   592			/* Set options as needed */
 > 593			if (exp->ex_path.mnt->mnt_sb->s_magic == BTRFS_SUPER_MAGIC)
   594				options |= NFSD_FH_OPTION_INO_UNIQUIFY;
   595		}
   596	
   597		if (ref_fh == fhp)
   598			fh_put(ref_fh);
   599	
   600		if (fhp->fh_locked || fhp->fh_dentry) {
   601			printk(KERN_ERR "fh_compose: fh %pd2 not initialized!\n",
   602			       dentry);
   603		}
   604		if (fhp->fh_maxsize < NFS_FHSIZE)
   605			printk(KERN_ERR "fh_compose: called with maxsize %d! %pd2\n",
   606			       fhp->fh_maxsize,
   607			       dentry);
   608	
   609		fhp->fh_dentry = dget(dentry); /* our internal copy */
   610		fhp->fh_export = exp_get(exp);
   611	
   612		if (fhp->fh_handle.fh_version == 0xca) {
   613			/* old style filehandle please */
   614			memset(&fhp->fh_handle.fh_base, 0, NFS_FHSIZE);
   615			fhp->fh_handle.fh_size = NFS_FHSIZE;
   616			fhp->fh_handle.ofh_dcookie = 0xfeebbaca;
   617			fhp->fh_handle.ofh_dev =  old_encode_dev(ex_dev);
   618			fhp->fh_handle.ofh_xdev = fhp->fh_handle.ofh_dev;
   619			fhp->fh_handle.ofh_xino =
   620				ino_t_to_u32(d_inode(exp->ex_path.dentry)->i_ino);
   621			fhp->fh_handle.ofh_dirino = ino_t_to_u32(parent_ino(dentry));
   622			if (inode)
   623				_fh_update_old(dentry, exp, &fhp->fh_handle);
   624		} else {
   625			fhp->fh_handle.fh_size =
   626				key_len(fhp->fh_handle.fh_fsid_type) + 4;
   627			fhp->fh_handle.fh_options = options;
   628	
   629			mk_fsid(fhp->fh_handle.fh_fsid_type,
   630				fhp->fh_handle.fh_fsid,
   631				ex_dev,
   632				d_inode(exp->ex_path.dentry)->i_ino,
   633				exp->ex_fsid, exp->ex_uuid);
   634	
   635			if (inode)
   636				_fh_update(fhp, exp, dentry);
   637			if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID) {
   638				fh_put(fhp);
   639				return nfserr_opnotsupp;
   640			}
   641		}
   642	
   643		return 0;
   644	}
   645	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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