Re: [PATCH] ntfs(3): export super block magic

Hi David,

kernel test robot noticed the following build errors:

[auto build test ERROR on next-20260319]
[cannot apply to brauner-vfs/vfs.all linus/master v7.0-rc4 v7.0-rc3 v7.0-rc2 v7.0-rc4]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/David-Timber/ntfs-3-export-super-block-magic/20260320-181810
base:   next-20260319
patch link:    https://lore.kernel.org/r/20260319234047.43253-1-dxdt%40dev.snart.me
patch subject: [PATCH] ntfs(3): export super block magic
config: sh-allmodconfig (https://download.01.org/0day-ci/archive/20260322/[email protected]/config)
compiler: sh4-linux-gcc (GCC) 15.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260322/[email protected]/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 <[email protected]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/

All errors (new ones prefixed by >>):

   fs/ntfs/super.c: In function 'ntfs_statfs':
>> fs/ntfs/super.c:2152:25: error: 'NTFS_SUPER_MAGIC' undeclared (first use in this function)
    2152 |         sfs->f_type   = NTFS_SUPER_MAGIC;
         |                         ^~~~~~~~~~~~~~~~
   fs/ntfs/super.c:2152:25: note: each undeclared identifier is reported only once for each function it appears in
   fs/ntfs/super.c: In function 'ntfs_fill_super':
   fs/ntfs/super.c:2355:23: error: 'NTFS_SUPER_MAGIC' undeclared (first use in this function)
    2355 |         sb->s_magic = NTFS_SUPER_MAGIC;
         |                       ^~~~~~~~~~~~~~~~
--
   fs/ntfs3/super.c: In function 'ntfs_statfs':
>> fs/ntfs3/super.c:734:23: error: 'NTFS3_SUPER_MAGIC' undeclared (first use in this function)
     734 |         buf->f_type = NTFS3_SUPER_MAGIC;
         |                       ^~~~~~~~~~~~~~~~~
   fs/ntfs3/super.c:734:23: note: each undeclared identifier is reported only once for each function it appears in
   fs/ntfs3/super.c: In function 'ntfs_fill_super':
   fs/ntfs3/super.c:1282:23: error: 'NTFS3_SUPER_MAGIC' undeclared (first use in this function)
    1282 |         sb->s_magic = NTFS3_SUPER_MAGIC;
         |                       ^~~~~~~~~~~~~~~~~


vim +/NTFS_SUPER_MAGIC +2152 fs/ntfs/super.c

  2123	
  2124	/*
  2125	 * ntfs_statfs - return information about mounted NTFS volume
  2126	 * @dentry:	dentry from mounted volume
  2127	 * @sfs:	statfs structure in which to return the information
  2128	 *
  2129	 * Return information about the mounted NTFS volume @dentry in the statfs structure
  2130	 * pointed to by @sfs (this is initialized with zeros before ntfs_statfs is
  2131	 * called). We interpret the values to be correct of the moment in time at
  2132	 * which we are called. Most values are variable otherwise and this isn't just
  2133	 * the free values but the totals as well. For example we can increase the
  2134	 * total number of file nodes if we run out and we can keep doing this until
  2135	 * there is no more space on the volume left at all.
  2136	 *
  2137	 * Called from vfs_statfs which is used to handle the statfs, fstatfs, and
  2138	 * ustat system calls.
  2139	 *
  2140	 * Return 0 on success or -errno on error.
  2141	 */
  2142	static int ntfs_statfs(struct dentry *dentry, struct kstatfs *sfs)
  2143	{
  2144		struct super_block *sb = dentry->d_sb;
  2145		s64 size;
  2146		struct ntfs_volume *vol = NTFS_SB(sb);
  2147		struct ntfs_inode *mft_ni = NTFS_I(vol->mft_ino);
  2148		unsigned long flags;
  2149	
  2150		ntfs_debug("Entering.");
  2151		/* Type of filesystem. */
> 2152		sfs->f_type   = NTFS_SUPER_MAGIC;
  2153		/* Optimal transfer block size. */
  2154		sfs->f_bsize = vol->cluster_size;
  2155		/* Fundamental file system block size, used as the unit. */
  2156		sfs->f_frsize = vol->cluster_size;
  2157	
  2158		/*
  2159		 * Total data blocks in filesystem in units of f_bsize and since
  2160		 * inodes are also stored in data blocs ($MFT is a file) this is just
  2161		 * the total clusters.
  2162		 */
  2163		sfs->f_blocks = vol->nr_clusters;
  2164	
  2165		/* wait event */
  2166		if (!NVolFreeClusterKnown(vol))
  2167			wait_event(vol->free_waitq, NVolFreeClusterKnown(vol));
  2168	
  2169		/* Free data blocks in filesystem in units of f_bsize. */
  2170		size = atomic64_read(&vol->free_clusters) -
  2171			atomic64_read(&vol->dirty_clusters);
  2172		if (size < 0LL)
  2173			size = 0LL;
  2174	
  2175		/* Free blocks avail to non-superuser, same as above on NTFS. */
  2176		sfs->f_bavail = sfs->f_bfree = size;
  2177	
  2178		/* Number of inodes in filesystem (at this point in time). */
  2179		read_lock_irqsave(&mft_ni->size_lock, flags);
  2180		sfs->f_files = i_size_read(vol->mft_ino) >> vol->mft_record_size_bits;
  2181		read_unlock_irqrestore(&mft_ni->size_lock, flags);
  2182	
  2183		/* Free inodes in fs (based on current total count). */
  2184		sfs->f_ffree = atomic64_read(&vol->free_mft_records);
  2185	
  2186		/*
  2187		 * File system id. This is extremely *nix flavour dependent and even
  2188		 * within Linux itself all fs do their own thing. I interpret this to
  2189		 * mean a unique id associated with the mounted fs and not the id
  2190		 * associated with the filesystem driver, the latter is already given
  2191		 * by the filesystem type in sfs->f_type. Thus we use the 64-bit
  2192		 * volume serial number splitting it into two 32-bit parts. We enter
  2193		 * the least significant 32-bits in f_fsid[0] and the most significant
  2194		 * 32-bits in f_fsid[1].
  2195		 */
  2196		sfs->f_fsid = u64_to_fsid(vol->serial_no);
  2197		/* Maximum length of filenames. */
  2198		sfs->f_namelen	   = NTFS_MAX_NAME_LEN;
  2199	
  2200		return 0;
  2201	}
  2202	

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