Re: [PATCH v3 2/3] fs: split off vfs_getdents function of getdents64 syscall

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

Hi Stefan,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on de5de0813b7dbbb71fb5d677ed823505a0e685c5]

url:    https://github.com/0day-ci/linux/commits/Stefan-Roesch/io_uring-add-getdents64-support/20211126-072952
base:   de5de0813b7dbbb71fb5d677ed823505a0e685c5
config: um-i386_defconfig (https://download.01.org/0day-ci/archive/20211126/202111261631.wvcMUeXO-lkp@intel.com/config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/018019be0b26997402fe7ba8367e5260ec2aa8c8
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Stefan-Roesch/io_uring-add-getdents64-support/20211126-072952
        git checkout 018019be0b26997402fe7ba8367e5260ec2aa8c8
        # save the config file to linux build tree
        make W=1 ARCH=um SUBARCH=i386

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

All warnings (new ones prefixed by >>):

>> fs/readdir.c:379:5: warning: no previous prototype for 'vfs_getdents' [-Wmissing-prototypes]
     379 | int vfs_getdents(struct file *file, struct linux_dirent64 __user *dirent,
         |     ^~~~~~~~~~~~


vim +/vfs_getdents +379 fs/readdir.c

   370	
   371	/**
   372	 * vfs_getdents - getdents without fdget
   373	 * @file    : pointer to file struct of directory
   374	 * @dirent  : pointer to user directory structure
   375	 * @count   : size of buffer
   376	 * @ctx_pos : if file pos is used, pass -1,
   377	 *            if ctx pos is used, pass ctx pos
   378	 */
 > 379	int vfs_getdents(struct file *file, struct linux_dirent64 __user *dirent,
   380			 unsigned int count, s64 ctx_pos)
   381	{
   382		struct getdents_callback64 buf = {
   383			.ctx.actor = filldir64,
   384			.ctx.pos = ctx_pos,
   385			.count = count,
   386			.current_dir = dirent
   387		};
   388		int error;
   389	
   390		error = do_iterate_dir(file, &buf.ctx, ctx_pos < 0);
   391		if (error >= 0)
   392			error = buf.error;
   393		if (buf.prev_reclen) {
   394			struct linux_dirent64 __user * lastdirent;
   395			typeof(lastdirent->d_off) d_off = buf.ctx.pos;
   396	
   397			lastdirent = (void __user *) buf.current_dir - buf.prev_reclen;
   398			if (put_user(d_off, &lastdirent->d_off))
   399				error = -EFAULT;
   400			else
   401				error = count - buf.count;
   402		}
   403	
   404		return error;
   405	}
   406	

---
0-DAY CI Kernel Test Service, Intel Corporation
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