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Subject[PATCH 02/18] lightnvm: pblk: refactor read lba sanity check
Date
Refactor lba sanity check on read path to avoid code duplication.

Signed-off-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Matias Bjørling <matias@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
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