Re: [RFC PATCH 2/5] fs: add the interface to query user write streams

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

Hi Kanchan,

[This is a private test report for your RFC patch.]
kernel test robot noticed the following build errors:

[auto build test ERROR on 66639db858112bf6b0f76677f7517643d586e575]

url:    https://github.com/intel-lab-lkp/linux/commits/Kanchan-Joshi/fs-add-a-new-user_write_streams-callback/20250729-225440
base:   66639db858112bf6b0f76677f7517643d586e575
patch link:    https://lore.kernel.org/r/20250729145135.12463-3-joshi.k%40samsung.com
patch subject: [RFC PATCH 2/5] fs: add the interface to query user write streams
config: x86_64-buildonly-randconfig-001-20250730 (https://download.01.org/0day-ci/archive/20250730/202507301220.RYskgxEV-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14+deb12u1) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250730/202507301220.RYskgxEV-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/202507301220.RYskgxEV-lkp@intel.com/

All errors (new ones prefixed by >>):

   ld: fs/fcntl.o: in function `vfs_user_write_streams':
>> fs/fcntl.c:403: undefined reference to `I_BDEV'


vim +403 fs/fcntl.c

   397	
   398	static u8 vfs_user_write_streams(struct inode *inode)
   399	{
   400		struct super_block *sb;
   401	
   402		if (S_ISBLK(inode->i_mode))
 > 403			return bdev_max_write_streams(I_BDEV(inode));
   404	
   405		sb = inode->i_sb;
   406		/* If available, use per-mount/fs policy */
   407		if (sb->s_op && sb->s_op->user_write_streams)
   408			return sb->s_op->user_write_streams(sb);
   409		/* otherwise, fallback to queue limit */
   410		if (sb->s_bdev)
   411			return bdev_max_write_streams(sb->s_bdev);
   412		return 0;
   413	}
   414	

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