[amir73il:fan_mark_userns 4/10] fs/erofs/ishare.c:117:2: error: call to undeclared function 'backing_file_set_user_path'; ISO C99 and later do not support implicit function declarations

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

tree:   https://github.com/amir73il/linux fan_mark_userns
head:   4d7cad2f077449767de4cc8ab6d869f080a121a2
commit: b66d24d8d654b23fbadf70e520e34d945219e8e5 [4/10] backing_file: store user_path_file
config: i386-randconfig-002-20260307 (https://download.01.org/0day-ci/archive/20260307/202603070720.Q19LixIn-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260307/202603070720.Q19LixIn-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/202603070720.Q19LixIn-lkp@intel.com/

All errors (new ones prefixed by >>):

>> fs/erofs/ishare.c:109:72: error: too few arguments to function call, expected 3, have 2
     109 |         realfile = alloc_empty_backing_file(O_RDONLY|O_NOATIME, current_cred());
         |                    ~~~~~~~~~~~~~~~~~~~~~~~~                                   ^
   fs/erofs/../internal.h:109:14: note: 'alloc_empty_backing_file' declared here
     109 | struct file *alloc_empty_backing_file(int flags, const struct cred *cred,
         |              ^                        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     110 |                                       const struct cred *user_cred);
         |                                       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> fs/erofs/ishare.c:117:2: error: call to undeclared function 'backing_file_set_user_path'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     117 |         backing_file_set_user_path(realfile, &file->f_path);
         |         ^
   fs/erofs/ishare.c:117:2: note: did you mean 'backing_file_open_user_path'?
   fs/erofs/../internal.h:111:6: note: 'backing_file_open_user_path' declared here
     111 | void backing_file_open_user_path(struct file *f, const struct path *path);
         |      ^
   2 errors generated.


vim +/backing_file_set_user_path +117 fs/erofs/ishare.c

5ef3208e3be50aa Hongzhen Luo 2026-01-23  101  
5ef3208e3be50aa Hongzhen Luo 2026-01-23  102  static int erofs_ishare_file_open(struct inode *inode, struct file *file)
5ef3208e3be50aa Hongzhen Luo 2026-01-23  103  {
5ef3208e3be50aa Hongzhen Luo 2026-01-23  104  	struct inode *sharedinode = EROFS_I(inode)->sharedinode;
5ef3208e3be50aa Hongzhen Luo 2026-01-23  105  	struct file *realfile;
5ef3208e3be50aa Hongzhen Luo 2026-01-23  106  
5ef3208e3be50aa Hongzhen Luo 2026-01-23  107  	if (file->f_flags & O_DIRECT)
5ef3208e3be50aa Hongzhen Luo 2026-01-23  108  		return -EINVAL;
5ef3208e3be50aa Hongzhen Luo 2026-01-23 @109  	realfile = alloc_empty_backing_file(O_RDONLY|O_NOATIME, current_cred());
5ef3208e3be50aa Hongzhen Luo 2026-01-23  110  	if (IS_ERR(realfile))
5ef3208e3be50aa Hongzhen Luo 2026-01-23  111  		return PTR_ERR(realfile);
5ef3208e3be50aa Hongzhen Luo 2026-01-23  112  	ihold(sharedinode);
5ef3208e3be50aa Hongzhen Luo 2026-01-23  113  	realfile->f_op = &erofs_file_fops;
5ef3208e3be50aa Hongzhen Luo 2026-01-23  114  	realfile->f_inode = sharedinode;
5ef3208e3be50aa Hongzhen Luo 2026-01-23  115  	realfile->f_mapping = sharedinode->i_mapping;
5ef3208e3be50aa Hongzhen Luo 2026-01-23  116  	path_get(&file->f_path);
5ef3208e3be50aa Hongzhen Luo 2026-01-23 @117  	backing_file_set_user_path(realfile, &file->f_path);
5ef3208e3be50aa Hongzhen Luo 2026-01-23  118  
5ef3208e3be50aa Hongzhen Luo 2026-01-23  119  	file_ra_state_init(&realfile->f_ra, file->f_mapping);
5ef3208e3be50aa Hongzhen Luo 2026-01-23  120  	realfile->private_data = EROFS_I(inode);
5ef3208e3be50aa Hongzhen Luo 2026-01-23  121  	file->private_data = realfile;
5ef3208e3be50aa Hongzhen Luo 2026-01-23  122  	return 0;
5ef3208e3be50aa Hongzhen Luo 2026-01-23  123  }
5ef3208e3be50aa Hongzhen Luo 2026-01-23  124  

:::::: The code at line 117 was first introduced by commit
:::::: 5ef3208e3be50aa08b4e7a2832f34e16d42c08b3 erofs: introduce the page cache share feature

:::::: TO: Hongzhen Luo <hongzhen@linux.alibaba.com>
:::::: CC: Gao Xiang <hsiangkao@linux.alibaba.com>

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