[koverstreet-bcachefs:bcachefs-testing 11/101] fs/bcachefs/vfs/ioctl.c:907:27: sparse: sparse: cast to non-scalar

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

tree:   https://github.com/koverstreet/bcachefs bcachefs-testing
head:   ca944a61e079450f82be88c91e349638c75cf4b6
commit: 39fe245ff806f1dcf1d02b034d35df86b8944ec2 [11/101] bcachefs: wire up error reporting in pread_raw ioctl
config: sh-randconfig-r123-20260514 (https://download.01.org/0day-ci/archive/20260516/202605160707.JD8cgCci-lkp@intel.com/config)
compiler: sh4-linux-gcc (GCC) 11.5.0
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260516/202605160707.JD8cgCci-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/202605160707.JD8cgCci-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> fs/bcachefs/vfs/ioctl.c:907:27: sparse: sparse: cast to non-scalar
>> fs/bcachefs/vfs/ioctl.c:907:27: sparse: sparse: cast from non-scalar

vim +907 fs/bcachefs/vfs/ioctl.c

   868	
   869	static long bch2_ioc_pread_raw(struct file *file,
   870				       struct bch_inode_info *inode,
   871				       struct bch_ioctl_pread_raw __user *uarg)
   872	{
   873		struct bch_ioctl_pread_raw arg;
   874	
   875		if (copy_from_user(&arg, uarg, sizeof(arg)))
   876			return -EFAULT;
   877		if (arg.flags & ~BCH_PREAD_RAW_no_poison_check)
   878			return -EINVAL;
   879		if (arg.err.pad)
   880			return -EINVAL;
   881		if (!arg.len)
   882			return 0;
   883		if (!(file->f_flags & O_DIRECT))
   884			return -EINVAL;
   885		if (!inode_owner_or_capable(file_mnt_idmap(file), &inode->v))
   886			return -EPERM;
   887	
   888		loff_t pos = arg.offset;
   889		int ret = rw_verify_area(READ, file, &pos, arg.len);
   890		if (ret)
   891			return ret;
   892	
   893		struct iov_iter iter;
   894		import_ubuf(ITER_DEST, (void __user *)(unsigned long)arg.buf, arg.len, &iter);
   895	
   896		struct kiocb kiocb;
   897		init_sync_kiocb(&kiocb, file);
   898		kiocb.ki_pos = arg.offset;
   899	
   900		enum bch_read_flags read_flags = 0;
   901		if (arg.flags & BCH_PREAD_RAW_no_poison_check)
   902			read_flags |= BCH_READ_no_poison_check;
   903	
   904		struct bch_read_err_report err_report;
   905		mutex_init(&err_report.lock);
   906		err_report.errors = 0;
 > 907		err_report.msg = (struct printbuf) PRINTBUF;
   908	
   909		ret = bch2_direct_IO_read(&kiocb, &iter, read_flags, &err_report);
   910	
   911		if (copy_to_user(&uarg->errors, &err_report.errors, sizeof(err_report.errors)))
   912			ret = -EFAULT;
   913	
   914		int err = bch2_copy_ioctl_err_msg(&arg.err, &err_report.msg, ret < 0 ? ret : 0);
   915		if (err && !ret)
   916			ret = err;
   917	
   918		printbuf_exit(&err_report.msg);
   919		return ret;
   920	}
   921	

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