lightnvm: pblk: allocate bio size more accurately

Wait until we know the exact number of ppas to be sent to the device,
before allocating the bio.

Signed-off-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

3 files changed, 15 insertions, 14 deletions

diff --git a/drivers/lightnvm/pblk-rb.c b/drivers/lightnvm/pblk-rb.c
index 05e6b2e9221d..1173e2380137 100644
--- a/drivers/lightnvm/pblk-rb.c
+++ b/drivers/lightnvm/pblk-rb.c
@@ -552,12 +552,13 @@ out:
  * persist data on the write buffer to the media.
  */
 unsigned int pblk_rb_read_to_bio(struct pblk_rb *rb, struct nvm_rq *rqd,
-                                 struct bio *bio, unsigned int pos,
-                                 unsigned int nr_entries, unsigned int count)
+                                 unsigned int pos, unsigned int nr_entries,
+                                 unsigned int count)
 {
         struct pblk *pblk = container_of(rb, struct pblk, rwb);
         struct request_queue *q = pblk->dev->q;
         struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd);
+        struct bio *bio = rqd->bio;
         struct pblk_rb_entry *entry;
         struct page *page;
         unsigned int pad = 0, to_read = nr_entries;
diff --git a/drivers/lightnvm/pblk-write.c b/drivers/lightnvm/pblk-write.c
index 0c0481cf9f5d..140a26edd1d3 100644
--- a/drivers/lightnvm/pblk-write.c
+++ b/drivers/lightnvm/pblk-write.c
@@ -534,24 +534,24 @@ static int pblk_submit_write(struct pblk *pblk)
         if (!secs_to_flush && secs_avail < pblk->min_write_pgs)
                 return 1;
 
-        bio = bio_alloc(GFP_KERNEL, pblk->max_write_pgs);
-
-        bio->bi_iter.bi_sector = 0; /* internal bio */
-        bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
-
-        rqd = pblk_alloc_rqd(pblk, WRITE);
-        rqd->bio = bio;
-
         secs_to_sync = pblk_calc_secs_to_sync(pblk, secs_avail, secs_to_flush);
         if (secs_to_sync > pblk->max_write_pgs) {
                 pr_err("pblk: bad buffer sync calculation\n");
-                goto fail_put_bio;
+                return 1;
         }
 
         secs_to_com = (secs_to_sync > secs_avail) ? secs_avail : secs_to_sync;
         pos = pblk_rb_read_commit(&pblk->rwb, secs_to_com);
 
-        if (pblk_rb_read_to_bio(&pblk->rwb, rqd, bio, pos, secs_to_sync,
+        bio = bio_alloc(GFP_KERNEL, secs_to_sync);
+
+        bio->bi_iter.bi_sector = 0; /* internal bio */
+        bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
+
+        rqd = pblk_alloc_rqd(pblk, WRITE);
+        rqd->bio = bio;
+
+        if (pblk_rb_read_to_bio(&pblk->rwb, rqd, pos, secs_to_sync,
                                                                 secs_avail)) {
                 pr_err("pblk: corrupted write bio\n");
                 goto fail_put_bio;
diff --git a/drivers/lightnvm/pblk.h b/drivers/lightnvm/pblk.h
index 876b50f97234..9f162057d497 100644
--- a/drivers/lightnvm/pblk.h
+++ b/drivers/lightnvm/pblk.h
@@ -666,8 +666,8 @@ void pblk_rb_flush(struct pblk_rb *rb);
 
 void pblk_rb_sync_l2p(struct pblk_rb *rb);
 unsigned int pblk_rb_read_to_bio(struct pblk_rb *rb, struct nvm_rq *rqd,
-                                 struct bio *bio, unsigned int pos,
-                                 unsigned int nr_entries, unsigned int count);
+                                 unsigned int pos, unsigned int nr_entries,
+                                 unsigned int count);
 unsigned int pblk_rb_read_to_bio_list(struct pblk_rb *rb, struct bio *bio,
                                       struct list_head *list,
                                       unsigned int max);