Commit 84454e6d authored by Javier González's avatar Javier González Committed by Jens Axboe
Browse files

lightnvm: pblk: refactor read lba sanity check 



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

Signed-off-by: default avatarJavier González <javier@cnexlabs.com>
Signed-off-by: default avatarMatias Bjørling <m@bjorling.me>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 9f6cb13b

drivers/lightnvm/pblk-read.c

+10 −19
Original line number Diff line number Diff line
@@ -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++) {
@@ -259,17 +252,10 @@ 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);
@@ -305,14 +291,19 @@ 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);
@@ -340,9 +331,9 @@ 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);