[PATCH 02/18] lightnvm: pblk: refactor read lba sanity check

[Javier González]

Refactor lba sanity check on read path to avoid code duplication.

Signed-off-by: Javier González <jav...@cnexlabs.com>
Signed-off-by: Matias Bjørling <mat...@cnexlabs.com>
---
 drivers/lightnvm/pblk-read.c | 29 ++++++++++-------------------
 1 file changed, 10 insertions(+), 19 deletions(-)

diff --git a/drivers/lightnvm/pblk-read.c b/drivers/lightnvm/pblk-read.c
index d682e89e6493..db9a3b575f62 100644
--- a/drivers/lightnvm/pblk-read.c
+++ b/drivers/lightnvm/pblk-read.c
@@ -39,21 +39,14 @@ static int pblk_read_from_cache(struct pblk *pblk, struct 
bio *bio,
 }
 
 static void pblk_read_ppalist_rq(struct pblk *pblk, struct nvm_rq *rqd,
-                                unsigned long *read_bitmap)
+                                sector_t blba, unsigned long *read_bitmap)
 {
        struct bio *bio = rqd->bio;
        struct ppa_addr ppas[PBLK_MAX_REQ_ADDRS];
-       sector_t blba = pblk_get_lba(bio);
        int nr_secs = rqd->nr_ppas;
        bool advanced_bio = false;
        int i, j = 0;
 
-       /* logic error: lba out-of-bounds. Ignore read request */
-       if (blba + nr_secs >= pblk->rl.nr_secs) {
-               WARN(1, "pblk: read lbas out of bounds\n");
-               return;
-       }
-
        pblk_lookup_l2p_seq(pblk, ppas, blba, nr_secs);
 
        for (i = 0; i < nr_secs; i++) {
@@ -263,17 +256,10 @@ static int pblk_fill_partial_read_bio(struct pblk *pblk, 
struct nvm_rq *rqd,
 }
 
 static void pblk_read_rq(struct pblk *pblk, struct nvm_rq *rqd,
-                        unsigned long *read_bitmap)
+                        sector_t lba, unsigned long *read_bitmap)
 {
        struct bio *bio = rqd->bio;
        struct ppa_addr ppa;
-       sector_t lba = pblk_get_lba(bio);
-
-       /* logic error: lba out-of-bounds. Ignore read request */
-       if (lba >= pblk->rl.nr_secs) {
-               WARN(1, "pblk: read lba out of bounds\n");
-               return;
-       }
 
        pblk_lookup_l2p_seq(pblk, &ppa, lba, 1);
 
@@ -309,14 +295,19 @@ static void pblk_read_rq(struct pblk *pblk, struct nvm_rq 
*rqd,
 int pblk_submit_read(struct pblk *pblk, struct bio *bio)
 {
        struct nvm_tgt_dev *dev = pblk->dev;
+       sector_t blba = pblk_get_lba(bio);
        unsigned int nr_secs = pblk_get_secs(bio);
        struct nvm_rq *rqd;
        unsigned long read_bitmap; /* Max 64 ppas per request */
        unsigned int bio_init_idx;
        int ret = NVM_IO_ERR;
 
-       if (nr_secs > PBLK_MAX_REQ_ADDRS)
+       /* logic error: lba out-of-bounds. Ignore read request */
+       if (blba >= pblk->rl.nr_secs || nr_secs > PBLK_MAX_REQ_ADDRS) {
+               WARN(1, "pblk: read lba out of bounds (lba:%llu, nr:%d)\n",
+                                       (unsigned long long)blba, nr_secs);
                return NVM_IO_ERR;
+       }
 
        bitmap_zero(&read_bitmap, nr_secs);
 
@@ -348,9 +339,9 @@ int pblk_submit_read(struct pblk *pblk, struct bio *bio)
                rqd->ppa_list = rqd->meta_list + pblk_dma_meta_size;
                rqd->dma_ppa_list = rqd->dma_meta_list + pblk_dma_meta_size;
 
-               pblk_read_ppalist_rq(pblk, rqd, &read_bitmap);
+               pblk_read_ppalist_rq(pblk, rqd, blba, &read_bitmap);
        } else {
-               pblk_read_rq(pblk, rqd, &read_bitmap);
+               pblk_read_rq(pblk, rqd, blba, &read_bitmap);
        }
 
        bio_get(bio);
-- 
2.7.4