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Commit c80914e8 authored by Mike Snitzer's avatar Mike Snitzer
Browse files

dm: return error if bio_integrity_clone() fails in clone_bio() 



clone_bio() now checks if bio_integrity_clone() returned an error rather
than just drop it on the floor.

Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
parent 2eae9e44

drivers/md/dm.c

+20 −7
Original line number Diff line number Diff line
@@ -1567,21 +1567,26 @@ static void bio_setup_sector(struct bio *bio, sector_t sector, unsigned len) 
/*

 * Creates a bio that consists of range of complete bvecs.

 */

static void clone_bio(struct dm_target_io *tio, struct bio *bio,

static int clone_bio(struct dm_target_io *tio, struct bio *bio,

		     sector_t sector, unsigned len)

{

	struct bio *clone = &tio->clone;



	__bio_clone_fast(clone, bio);



	if (bio_integrity(bio))

		bio_integrity_clone(clone, bio, GFP_NOIO);

	if (bio_integrity(bio)) {

		int r = bio_integrity_clone(clone, bio, GFP_NOIO);

		if (r < 0)

			return r;

	}



	bio_advance(clone, to_bytes(sector - clone->bi_iter.bi_sector));

	clone->bi_iter.bi_size = to_bytes(len);



	if (bio_integrity(bio))

		bio_integrity_trim(clone, 0, len);



	return 0;

}



static struct dm_target_io *alloc_tio(struct clone_info *ci,
@@ -1638,13 +1643,14 @@ static int __send_empty_flush(struct clone_info *ci) 
	return 0;

}



static void __clone_and_map_data_bio(struct clone_info *ci, struct dm_target *ti,

static int __clone_and_map_data_bio(struct clone_info *ci, struct dm_target *ti,

				     sector_t sector, unsigned *len)

{

	struct bio *bio = ci->bio;

	struct dm_target_io *tio;

	unsigned target_bio_nr;

	unsigned num_target_bios = 1;

	int r = 0;



	/*

	 * Does the target want to receive duplicate copies of the bio?
@@ -1655,9 +1661,13 @@ static void __clone_and_map_data_bio(struct clone_info *ci, struct dm_target *ti 
	for (target_bio_nr = 0; target_bio_nr < num_target_bios; target_bio_nr++) {

		tio = alloc_tio(ci, ti, target_bio_nr);

		tio->len_ptr = len;

		clone_bio(tio, bio, sector, *len);

		r = clone_bio(tio, bio, sector, *len);

		if (r < 0)

			break;

		__map_bio(tio);

	}



	return r;

}



typedef unsigned (*get_num_bios_fn)(struct dm_target *ti);
@@ -1734,6 +1744,7 @@ static int __split_and_process_non_flush(struct clone_info *ci) 
	struct bio *bio = ci->bio;

	struct dm_target *ti;

	unsigned len;

	int r;



	if (unlikely(bio->bi_rw & REQ_DISCARD))

		return __send_discard(ci);
@@ -1746,7 +1757,9 @@ static int __split_and_process_non_flush(struct clone_info *ci) 


	len = min_t(sector_t, max_io_len(ci->sector, ti), ci->sector_count);



	__clone_and_map_data_bio(ci, ti, ci->sector, &len);

	r = __clone_and_map_data_bio(ci, ti, ci->sector, &len);

	if (r < 0)

		return r;



	ci->sector += len;

	ci->sector_count -= len;