diff options
| author | John Pittman <jpittman@redhat.com> | 2018-08-23 19:35:57 +0200 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2018-10-16 20:27:38 +0200 |
| commit | 092b5648760a23656f6dcc83b74f4cf661094aca (patch) | |
| tree | 6f3d1b43bf3cd0caa7a8ac3fa4b60f37221f519e /drivers/md | |
| parent | dm thin: use refcount_t for thin_c reference counting (diff) | |
| download | linux-092b5648760a23656f6dcc83b74f4cf661094aca.tar.xz linux-092b5648760a23656f6dcc83b74f4cf661094aca.zip | |
dm zoned: target: use refcount_t for dm zoned reference counters
The API surrounding refcount_t should be used in place of atomic_t
when variables are being used as reference counters. This API can
prevent issues such as counter overflows and use-after-free
conditions. Within the dm zoned target stack, the atomic_t API is
used for bioctx->ref and cw->refcount. Change these to use
refcount_t, avoiding the issues mentioned.
Signed-off-by: John Pittman <jpittman@redhat.com>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Tested-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/dm-zoned-target.c | 20 |
1 files changed, 10 insertions, 10 deletions
diff --git a/drivers/md/dm-zoned-target.c b/drivers/md/dm-zoned-target.c index a44183ff4be0..fa36825c1eff 100644 --- a/drivers/md/dm-zoned-target.c +++ b/drivers/md/dm-zoned-target.c @@ -19,7 +19,7 @@ struct dmz_bioctx { struct dmz_target *target; struct dm_zone *zone; struct bio *bio; - atomic_t ref; + refcount_t ref; blk_status_t status; }; @@ -28,7 +28,7 @@ struct dmz_bioctx { */ struct dm_chunk_work { struct work_struct work; - atomic_t refcount; + refcount_t refcount; struct dmz_target *target; unsigned int chunk; struct bio_list bio_list; @@ -115,7 +115,7 @@ static int dmz_submit_read_bio(struct dmz_target *dmz, struct dm_zone *zone, if (nr_blocks == dmz_bio_blocks(bio)) { /* Setup and submit the BIO */ bio->bi_iter.bi_sector = sector; - atomic_inc(&bioctx->ref); + refcount_inc(&bioctx->ref); generic_make_request(bio); return 0; } @@ -134,7 +134,7 @@ static int dmz_submit_read_bio(struct dmz_target *dmz, struct dm_zone *zone, bio_advance(bio, clone->bi_iter.bi_size); /* Submit the clone */ - atomic_inc(&bioctx->ref); + refcount_inc(&bioctx->ref); generic_make_request(clone); return 0; @@ -240,7 +240,7 @@ static void dmz_submit_write_bio(struct dmz_target *dmz, struct dm_zone *zone, /* Setup and submit the BIO */ bio_set_dev(bio, dmz->dev->bdev); bio->bi_iter.bi_sector = dmz_start_sect(dmz->metadata, zone) + dmz_blk2sect(chunk_block); - atomic_inc(&bioctx->ref); + refcount_inc(&bioctx->ref); generic_make_request(bio); if (dmz_is_seq(zone)) @@ -456,7 +456,7 @@ out: */ static inline void dmz_get_chunk_work(struct dm_chunk_work *cw) { - atomic_inc(&cw->refcount); + refcount_inc(&cw->refcount); } /* @@ -465,7 +465,7 @@ static inline void dmz_get_chunk_work(struct dm_chunk_work *cw) */ static void dmz_put_chunk_work(struct dm_chunk_work *cw) { - if (atomic_dec_and_test(&cw->refcount)) { + if (refcount_dec_and_test(&cw->refcount)) { WARN_ON(!bio_list_empty(&cw->bio_list)); radix_tree_delete(&cw->target->chunk_rxtree, cw->chunk); kfree(cw); @@ -546,7 +546,7 @@ static void dmz_queue_chunk_work(struct dmz_target *dmz, struct bio *bio) goto out; INIT_WORK(&cw->work, dmz_chunk_work); - atomic_set(&cw->refcount, 0); + refcount_set(&cw->refcount, 0); cw->target = dmz; cw->chunk = chunk; bio_list_init(&cw->bio_list); @@ -599,7 +599,7 @@ static int dmz_map(struct dm_target *ti, struct bio *bio) bioctx->target = dmz; bioctx->zone = NULL; bioctx->bio = bio; - atomic_set(&bioctx->ref, 1); + refcount_set(&bioctx->ref, 1); bioctx->status = BLK_STS_OK; /* Set the BIO pending in the flush list */ @@ -633,7 +633,7 @@ static int dmz_end_io(struct dm_target *ti, struct bio *bio, blk_status_t *error if (bioctx->status == BLK_STS_OK && *error) bioctx->status = *error; - if (!atomic_dec_and_test(&bioctx->ref)) + if (!refcount_dec_and_test(&bioctx->ref)) return DM_ENDIO_INCOMPLETE; /* Done */ |