lightnvm/pblk-read: use bio_clone_fast()

pblk_submit_read() uses bio_clone_bioset() but doesn't change the
io_vec, so bio_clone_fast() is a better choice.

It also uses fs_bio_set which is intended for filesystems.  Using it
in a device driver can deadlock.
So allocate a new bioset, and and use bio_clone_fast().

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Javier González <javier@cnexlabs.com>
Tested-by: Javier González <javier@cnexlabs.com>
Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 11 insertions, 1 deletions

diff --git a/drivers/lightnvm/pblk-init.c b/drivers/lightnvm/pblk-init.c
index b3fec8ec55b8..aaefbccce30e 100644
--- a/drivers/lightnvm/pblk-init.c
+++ b/drivers/lightnvm/pblk-init.c
@@ -23,6 +23,7 @@
 static struct kmem_cache *pblk_blk_ws_cache, *pblk_rec_cache, *pblk_r_rq_cache,
                                         *pblk_w_rq_cache, *pblk_line_meta_cache;
 static DECLARE_RWSEM(pblk_lock);
+struct bio_set *pblk_bio_set;
 
 static int pblk_rw_io(struct request_queue *q, struct pblk *pblk,
                           struct bio *bio)
@@ -946,11 +947,20 @@ static struct nvm_tgt_type tt_pblk = {
 
 static int __init pblk_module_init(void)
 {
-        return nvm_register_tgt_type(&tt_pblk);
+        int ret;
+
+        pblk_bio_set = bioset_create(BIO_POOL_SIZE, 0, 0);
+        if (!pblk_bio_set)
+                return -ENOMEM;
+        ret = nvm_register_tgt_type(&tt_pblk);
+        if (ret)
+                bioset_free(pblk_bio_set);
+        return ret;
 }
 
 static void pblk_module_exit(void)
 {
+        bioset_free(pblk_bio_set);
         nvm_unregister_tgt_type(&tt_pblk);
 }