lightnvm: introduce nvm_rq_to_ppa_list

There is a number of places in the lightnvm subsystem where the user
iterates over the ppa list. Before iterating, the user must know if it
is a single or multiple LBAs due to vector commands using either the
nvm_rq ->ppa_addr or ->ppa_list fields on command submission, which
leads to open-coding the if/else statement.

Instead of having multiple if/else's, move it into a function that can
be called by its users.

A nice side effect of this cleanup is that this patch fixes up a
bunch of cases where we don't consider the single-ppa case in pblk.

Signed-off-by: Hans Holmberg <hans.holmberg@cnexlabs.com>
Signed-off-by: Matias Bjørling <mb@lightnvm.io>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 5 insertions, 0 deletions

diff --git a/include/linux/lightnvm.h b/include/linux/lightnvm.h
index 77743a02ec0d..50ac5b21297c 100644
--- a/include/linux/lightnvm.h
+++ b/include/linux/lightnvm.h
@@ -320,6 +320,11 @@ static inline void *nvm_rq_to_pdu(struct nvm_rq *rqdata)
         return rqdata + 1;
 }
 
+static inline struct ppa_addr *nvm_rq_to_ppa_list(struct nvm_rq *rqd)
+{
+        return (rqd->nr_ppas > 1) ? rqd->ppa_list : &rqd->ppa_addr;
+}
+
 enum {
         NVM_BLK_ST_FREE =       0x1,    /* Free block */
         NVM_BLK_ST_TGT =        0x2,    /* Block in use by target */