From 2a2a4c510b761e800098992cac61281c86527e5d Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Thu, 7 Jun 2018 14:42:06 -0600 Subject: [PATCH] dm: use bioset_init_from_src() to copy bio_set We can't just copy and clear a bio_set, use the bio helper to setup a new bio_set with the settings from another one. Fixes: 6f1c819c219f ("dm: convert to bioset_init()/mempool_init()") Reported-by: Venkat R.B Tested-by: Venkat R.B Tested-by: Li Wang Reviewed-by: Mike Snitzer Signed-off-by: Jens Axboe --- drivers/md/dm.c | 22 ++++++++++++++++------ 1 file changed, 16 insertions(+), 6 deletions(-) diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 98dff36..20a8d63 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1953,9 +1953,10 @@ static void free_dev(struct mapped_device *md) kvfree(md); } -static void __bind_mempools(struct mapped_device *md, struct dm_table *t) +static int __bind_mempools(struct mapped_device *md, struct dm_table *t) { struct dm_md_mempools *p = dm_table_get_md_mempools(t); + int ret = 0; if (dm_table_bio_based(t)) { /* @@ -1982,13 +1983,16 @@ static void __bind_mempools(struct mapped_device *md, struct dm_table *t) bioset_initialized(&md->bs) || bioset_initialized(&md->io_bs)); - md->bs = p->bs; - memset(&p->bs, 0, sizeof(p->bs)); - md->io_bs = p->io_bs; - memset(&p->io_bs, 0, sizeof(p->io_bs)); + ret = bioset_init_from_src(&md->bs, &p->bs); + if (ret) + goto out; + ret = bioset_init_from_src(&md->io_bs, &p->io_bs); + if (ret) + bioset_exit(&md->bs); out: /* mempool bind completed, no longer need any mempools in the table */ dm_table_free_md_mempools(t); + return ret; } /* @@ -2033,6 +2037,7 @@ static struct dm_table *__bind(struct mapped_device *md, struct dm_table *t, struct request_queue *q = md->queue; bool request_based = dm_table_request_based(t); sector_t size; + int ret; lockdep_assert_held(&md->suspend_lock); @@ -2068,7 +2073,11 @@ static struct dm_table *__bind(struct mapped_device *md, struct dm_table *t, md->immutable_target = dm_table_get_immutable_target(t); } - __bind_mempools(md, t); + ret = __bind_mempools(md, t); + if (ret) { + old_map = ERR_PTR(ret); + goto out; + } old_map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); rcu_assign_pointer(md->map, (void *)t); @@ -2078,6 +2087,7 @@ static struct dm_table *__bind(struct mapped_device *md, struct dm_table *t, if (old_map) dm_sync_table(md); +out: return old_map; } -- 2.7.4