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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: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mike Snitzer 2016-03-02 12:33:03 -05:00
parent 2eae9e4489
commit c80914e81e
1 changed files with 20 additions and 7 deletions
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27
drivers/md/dm.c
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@ -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,
sector_t sector, unsigned len)
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;