Re: [PATCH v5 04/22] cachefiles: notify user daemon with anon_fd when looking up cookie

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Hi Jeffle,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on trondmy-nfs/linux-next]
[also build test ERROR on rostedt-trace/for-next linus/master v5.17-rc8]
[cannot apply to xiang-erofs/dev-test dhowells-fs/fscache-next next-20220316]
[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-on-demand-read-semantics/20220316-214711
base:   git://git.linux-nfs.org/projects/trondmy/linux-nfs.git linux-next
config: ia64-randconfig-r033-20220317 (https://download.01.org/0day-ci/archive/20220317/202203170323.idYrKxCZ-lkp@xxxxxxxxx/config)
compiler: ia64-linux-gcc (GCC) 11.2.0
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/ef29cbdc09ec1e6ab918eaf5a16fa7ba8d23fb54
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Jeffle-Xu/fscache-erofs-fscache-based-on-demand-read-semantics/20220316-214711
        git checkout ef29cbdc09ec1e6ab918eaf5a16fa7ba8d23fb54
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=ia64 SHELL=/bin/bash fs/cachefiles/

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

All errors (new ones prefixed by >>):

   In file included from arch/ia64/include/asm/pgtable.h:153,
                    from include/linux/pgtable.h:6,
                    from arch/ia64/include/asm/uaccess.h:40,
                    from include/linux/uaccess.h:11,
                    from include/linux/sched/task.h:11,
                    from include/linux/sched/signal.h:9,
                    from include/linux/rcuwait.h:6,
                    from include/linux/percpu-rwsem.h:7,
                    from include/linux/fs.h:33,
                    from fs/cachefiles/daemon.c:13:
   arch/ia64/include/asm/mmu_context.h: In function 'reload_context':
   arch/ia64/include/asm/mmu_context.h:127:48: warning: variable 'old_rr4' set but not used [-Wunused-but-set-variable]
     127 |         unsigned long rr0, rr1, rr2, rr3, rr4, old_rr4;
         |                                                ^~~~~~~
   fs/cachefiles/daemon.c: In function 'cachefiles_ondemand_fd_write_iter':
>> fs/cachefiles/daemon.c:160:26: error: invalid use of undefined type 'struct iov_iter'
     160 |         size_t len = iter->count;
         |                          ^~


vim +160 fs/cachefiles/daemon.c

   153	
   154	static ssize_t cachefiles_ondemand_fd_write_iter(struct kiocb *kiocb,
   155							 struct iov_iter *iter)
   156	{
   157		struct cachefiles_object *object = kiocb->ki_filp->private_data;
   158		struct cachefiles_cache *cache = object->volume->cache;
   159		struct file *file = object->file;
 > 160		size_t len = iter->count;
   161		loff_t pos = kiocb->ki_pos;
   162		const struct cred *saved_cred;
   163		int ret;
   164	
   165		if (!file)
   166			return -ENOBUFS;
   167	
   168		cachefiles_begin_secure(cache, &saved_cred);
   169		ret = __cachefiles_prepare_write(object, file, &pos, &len, true);
   170		cachefiles_end_secure(cache, saved_cred);
   171		if (ret < 0)
   172			return ret;
   173	
   174		ret = __cachefiles_write(object, file, pos, iter, NULL, NULL);
   175		if (!ret)
   176			ret = len;
   177	
   178		return ret;
   179	}
   180	

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