Re: [PATCH v1 2/2] fuse: support io-uring registered buffers

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

Hi Joanne,

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-rc2 next-20251023]
[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/Joanne-Koong/io-uring-add-io_uring_cmd_get_buffer_info/20251023-042601
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse.git for-next
patch link:    https://lore.kernel.org/r/20251022202021.3649586-3-joannelkoong%40gmail.com
patch subject: [PATCH v1 2/2] fuse: support io-uring registered buffers
config: i386-buildonly-randconfig-003-20251023 (https://download.01.org/0day-ci/archive/20251023/202510232014.8BtM55jj-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251023/202510232014.8BtM55jj-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/202510232014.8BtM55jj-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from fs/fuse/inode.c:11:
>> fs/fuse/dev_uring_i.h:51:41: error: field 'payload_iter' has incomplete type
      51 |                         struct iov_iter payload_iter;
         |                                         ^~~~~~~~~~~~
>> fs/fuse/dev_uring_i.h:52:41: error: field 'headers_iter' has incomplete type
      52 |                         struct iov_iter headers_iter;
         |                                         ^~~~~~~~~~~~


vim +/payload_iter +51 fs/fuse/dev_uring_i.h

    38	
    39	/** A fuse ring entry, part of the ring queue */
    40	struct fuse_ring_ent {
    41		/* True if daemon has registered its buffers ahead of time */
    42		bool is_fixed_buffer;
    43		union {
    44			/* userspace buffer */
    45			struct {
    46				struct fuse_uring_req_header __user *headers;
    47				void __user *payload;
    48			} user;
    49	
    50			struct {
  > 51				struct iov_iter payload_iter;
  > 52				struct iov_iter headers_iter;
    53			} fixed_buffer;
    54		};
    55	
    56		/* the ring queue that owns the request */
    57		struct fuse_ring_queue *queue;
    58	
    59		/* fields below are protected by queue->lock */
    60	
    61		struct io_uring_cmd *cmd;
    62	
    63		struct list_head list;
    64	
    65		enum fuse_ring_req_state state;
    66	
    67		struct fuse_req *fuse_req;
    68	};
    69	

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