drivers/md/dm.c:1324:9: sparse: sparse: cast from restricted blk_opf_t

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   8bc67e4db64aa72732c474b44ea8622062c903f0
commit: de67c139b3846ece6b8bbb62abf1f010ae85c083 dm: test for REQ_ATOMIC in dm_accept_partial_bio()
date:   5 months ago
config: mips-randconfig-r134-20260521 (https://download.01.org/0day-ci/archive/20260521/202605212337.mycdFkcd-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 5bac06718f502014fade905512f1d26d578a18f3)
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260521/202605212337.mycdFkcd-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
| Fixes: de67c139b384 ("dm: test for REQ_ATOMIC in dm_accept_partial_bio()")
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202605212337.mycdFkcd-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/md/dm.c:1324:9: sparse: sparse: cast from restricted blk_opf_t

vim +1324 drivers/md/dm.c

  1283	
  1284	/*
  1285	 * A target may call dm_accept_partial_bio only from the map routine.  It is
  1286	 * allowed for all bio types except REQ_PREFLUSH, REQ_OP_ZONE_* zone management
  1287	 * operations, zone append writes (native with REQ_OP_ZONE_APPEND or emulated
  1288	 * with write BIOs flagged with BIO_EMULATES_ZONE_APPEND) and any bio serviced
  1289	 * by __send_duplicate_bios().
  1290	 *
  1291	 * dm_accept_partial_bio informs the dm that the target only wants to process
  1292	 * additional n_sectors sectors of the bio and the rest of the data should be
  1293	 * sent in a next bio.
  1294	 *
  1295	 * A diagram that explains the arithmetics:
  1296	 * +--------------------+---------------+-------+
  1297	 * |         1          |       2       |   3   |
  1298	 * +--------------------+---------------+-------+
  1299	 *
  1300	 * <-------------- *tio->len_ptr --------------->
  1301	 *                      <----- bio_sectors ----->
  1302	 *                      <-- n_sectors -->
  1303	 *
  1304	 * Region 1 was already iterated over with bio_advance or similar function.
  1305	 *	(it may be empty if the target doesn't use bio_advance)
  1306	 * Region 2 is the remaining bio size that the target wants to process.
  1307	 *	(it may be empty if region 1 is non-empty, although there is no reason
  1308	 *	 to make it empty)
  1309	 * The target requires that region 3 is to be sent in the next bio.
  1310	 *
  1311	 * If the target wants to receive multiple copies of the bio (via num_*bios, etc),
  1312	 * the partially processed part (the sum of regions 1+2) must be the same for all
  1313	 * copies of the bio.
  1314	 */
  1315	void dm_accept_partial_bio(struct bio *bio, unsigned int n_sectors)
  1316	{
  1317		struct dm_target_io *tio = clone_to_tio(bio);
  1318		struct dm_io *io = tio->io;
  1319		unsigned int bio_sectors = bio_sectors(bio);
  1320	
  1321		BUG_ON(dm_tio_flagged(tio, DM_TIO_IS_DUPLICATE_BIO));
  1322		BUG_ON(bio_sectors > *tio->len_ptr);
  1323		BUG_ON(n_sectors > bio_sectors);
> 1324		BUG_ON(bio->bi_opf & REQ_ATOMIC);
  1325	
  1326		if (static_branch_unlikely(&zoned_enabled) &&
  1327		    unlikely(bdev_is_zoned(bio->bi_bdev))) {
  1328			enum req_op op = bio_op(bio);
  1329	
  1330			BUG_ON(op_is_zone_mgmt(op));
  1331			BUG_ON(op == REQ_OP_WRITE);
  1332			BUG_ON(op == REQ_OP_WRITE_ZEROES);
  1333			BUG_ON(op == REQ_OP_ZONE_APPEND);
  1334		}
  1335	
  1336		*tio->len_ptr -= bio_sectors - n_sectors;
  1337		bio->bi_iter.bi_size = n_sectors << SECTOR_SHIFT;
  1338	
  1339		/*
  1340		 * __split_and_process_bio() may have already saved mapped part
  1341		 * for accounting but it is being reduced so update accordingly.
  1342		 */
  1343		dm_io_set_flag(io, DM_IO_WAS_SPLIT);
  1344		io->sectors = n_sectors;
  1345		io->sector_offset = bio_sectors(io->orig_bio);
  1346	}
  1347	EXPORT_SYMBOL_GPL(dm_accept_partial_bio);
  1348	

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