[PATCH v1 19/23] cachefiles: implement .demand_read() for demand read

[kernel test robot]

Hi Jeffle,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on dhowells-fs/fscache-next]
[cannot apply to xiang-erofs/dev-test ceph-client/for-linus linus/master v5.16-rc7 next-20211224]
[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/Jeffle-Xu/fscache-erofs-fscache-based-demand-read-semantics/20211227-205742
base:   https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git fscache-next
config: i386-randconfig-r005-20211227 (https://download.01.org/0day-ci/archive/20211227/202112272353.ekKESQX6-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 511726c64d3b6cca66f7c54d457d586aa3129f67)
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/54c300b4598e3f2836d8233681da387fe388cfda
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Jeffle-Xu/fscache-erofs-fscache-based-demand-read-semantics/20211227-205742
        git checkout 54c300b4598e3f2836d8233681da387fe388cfda
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash fs/cachefiles/

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

All warnings (new ones prefixed by >>):

>> fs/cachefiles/io.c:564:5: warning: no previous prototype for function 'cachefiles_demand_read' [-Wmissing-prototypes]
   int cachefiles_demand_read(struct netfs_cache_resources *cres,
       ^
   fs/cachefiles/io.c:564:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int cachefiles_demand_read(struct netfs_cache_resources *cres,
   ^
   static 
   1 warning generated.


vim +/cachefiles_demand_read +564 fs/cachefiles/io.c

   563	
 > 564	int cachefiles_demand_read(struct netfs_cache_resources *cres,
   565				   loff_t start_pos, size_t len)
   566	{
   567		struct cachefiles_object *object;
   568		struct cachefiles_cache *cache;
   569		struct cachefiles_req *req;
   570		int ret;
   571	
   572		object = cachefiles_cres_object(cres);
   573		cache = object->volume->cache;
   574	
   575		req = cachefiles_alloc_req(object, start_pos, len);
   576		if (!req)
   577			return -ENOMEM;
   578	
   579		spin_lock(&cache->reqs_lock);
   580		ret = idr_alloc(&cache->reqs, req, 0, 0, GFP_KERNEL);
   581		if (ret >= 0)
   582			req->req_in.id = ret;
   583		spin_unlock(&cache->reqs_lock);
   584		if (ret < 0) {
   585			kfree(req);
   586			return -ENOMEM;
   587		}
   588	
   589		wake_up_all(&cache->daemon_pollwq);
   590	
   591		wait_for_completion(&req->done);
   592		kfree(req);
   593	
   594		return 0;
   595	}
   596	

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