Re: [PATCH] fuse: add zero-copy to fuse-over-io_uring

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

Hi Xiaobing,

kernel test robot noticed the following build errors:

[auto build test ERROR on mszeredi-fuse/for-next]
[also build test ERROR on linus/master v6.18 next-20251212]
[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/Xiaobing-Li/fuse-add-zero-copy-to-fuse-over-io_uring/20251204-165924
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse.git for-next
patch link:    https://lore.kernel.org/r/20251204082536.17349-1-xiaobing.li%40samsung.com
patch subject: [PATCH] fuse: add zero-copy to fuse-over-io_uring
config: hexagon-randconfig-002-20251212 (https://download.01.org/0day-ci/archive/20251213/202512130032.tLxDKB6B-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 1335a05ab8bc8339ce24be3a9da89d8c3f4e0571)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251213/202512130032.tLxDKB6B-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/202512130032.tLxDKB6B-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from fs/fuse/trace.c:6:
>> fs/fuse/dev_uring_i.h:43:18: error: field has incomplete type 'struct iov_iter'
      43 |         struct iov_iter payload_iter;
         |                         ^
   include/linux/fs.h:74:8: note: forward declaration of 'struct iov_iter'
      74 | struct iov_iter;
         |        ^
   1 error generated.


vim +43 fs/fuse/dev_uring_i.h

    38	
    39	/** A fuse ring entry, part of the ring queue */
    40	struct fuse_ring_ent {
    41		bool zero_copy;
    42	
  > 43		struct iov_iter payload_iter;
    44	
    45		/* userspace buffer */
    46		struct fuse_uring_req_header __user *headers;
    47		void __user *payload;
    48	
    49		/* the ring queue that owns the request */
    50		struct fuse_ring_queue *queue;
    51	
    52		/* fields below are protected by queue->lock */
    53	
    54		struct io_uring_cmd *cmd;
    55	
    56		struct list_head list;
    57	
    58		enum fuse_ring_req_state state;
    59	
    60		struct fuse_req *fuse_req;
    61	};
    62	

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