Commit 525f7bb2 authored by Hans Holmberg's avatar Hans Holmberg Committed by Jens Axboe
Browse files

lightnvm: pblk: stop writes gracefully when running out of lines 



If mapping fails (i.e. when running out of lines), handle the error
and stop writing.

Signed-off-by: default avatarHans Holmberg <hans.holmberg@cnexlabs.com>
Reviewed-by: default avatarJavier González <javier@javigon.com>
Signed-off-by: default avatarMatias Bjørling <mb@lightnvm.io>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent ab3887be

drivers/lightnvm/pblk-map.c

+29 −18
Original line number Diff line number Diff line
@@ -33,6 +33,9 @@ static int pblk_map_page_data(struct pblk *pblk, unsigned int sentry, 
	int nr_secs = pblk->min_write_pgs;

	int i;



	if (!line)

		return -ENOSPC;



	if (pblk_line_is_full(line)) {

		struct pblk_line *prev_line = line;
@@ -42,8 +45,11 @@ static int pblk_map_page_data(struct pblk *pblk, unsigned int sentry, 
		line = pblk_line_replace_data(pblk);

		pblk_line_close_meta(pblk, prev_line);



		if (!line)

			return -EINTR;

		if (!line) {

			pblk_pipeline_stop(pblk);

			return -ENOSPC;

		}



	}



	emeta = line->emeta;
@@ -84,7 +90,7 @@ static int pblk_map_page_data(struct pblk *pblk, unsigned int sentry, 
	return 0;

}



void pblk_map_rq(struct pblk *pblk, struct nvm_rq *rqd, unsigned int sentry,

int pblk_map_rq(struct pblk *pblk, struct nvm_rq *rqd, unsigned int sentry,

		 unsigned long *lun_bitmap, unsigned int valid_secs,

		 unsigned int off)

{
@@ -93,20 +99,22 @@ void pblk_map_rq(struct pblk *pblk, struct nvm_rq *rqd, unsigned int sentry, 
	unsigned int map_secs;

	int min = pblk->min_write_pgs;

	int i;

	int ret;



	for (i = off; i < rqd->nr_ppas; i += min) {

		map_secs = (i + min > valid_secs) ? (valid_secs % min) : min;

		if (pblk_map_page_data(pblk, sentry + i, &ppa_list[i],

					lun_bitmap, &meta_list[i], map_secs)) {

			bio_put(rqd->bio);

			pblk_free_rqd(pblk, rqd, PBLK_WRITE);

			pblk_pipeline_stop(pblk);

		}



		ret = pblk_map_page_data(pblk, sentry + i, &ppa_list[i],

					lun_bitmap, &meta_list[i], map_secs);

		if (ret)

			return ret;

	}



	return 0;

}



/* only if erase_ppa is set, acquire erase semaphore */

void pblk_map_erase_rq(struct pblk *pblk, struct nvm_rq *rqd,

int pblk_map_erase_rq(struct pblk *pblk, struct nvm_rq *rqd,

		       unsigned int sentry, unsigned long *lun_bitmap,

		       unsigned int valid_secs, struct ppa_addr *erase_ppa)

{
@@ -119,15 +127,16 @@ void pblk_map_erase_rq(struct pblk *pblk, struct nvm_rq *rqd, 
	unsigned int map_secs;

	int min = pblk->min_write_pgs;

	int i, erase_lun;

	int ret;





	for (i = 0; i < rqd->nr_ppas; i += min) {

		map_secs = (i + min > valid_secs) ? (valid_secs % min) : min;

		if (pblk_map_page_data(pblk, sentry + i, &ppa_list[i],

					lun_bitmap, &meta_list[i], map_secs)) {

			bio_put(rqd->bio);

			pblk_free_rqd(pblk, rqd, PBLK_WRITE);

			pblk_pipeline_stop(pblk);

		}



		ret = pblk_map_page_data(pblk, sentry + i, &ppa_list[i],

					lun_bitmap, &meta_list[i], map_secs);

		if (ret)

			return ret;



		erase_lun = pblk_ppa_to_pos(geo, ppa_list[i]);
@@ -163,7 +172,7 @@ void pblk_map_erase_rq(struct pblk *pblk, struct nvm_rq *rqd, 
	 */

	e_line = pblk_line_get_erase(pblk);

	if (!e_line)

		return;

		return -ENOSPC;



	/* Erase blocks that are bad in this line but might not be in next */

	if (unlikely(pblk_ppa_empty(*erase_ppa)) &&
@@ -174,7 +183,7 @@ retry: 
		bit = find_next_bit(d_line->blk_bitmap,

						lm->blk_per_line, bit + 1);

		if (bit >= lm->blk_per_line)

			return;

			return 0;



		spin_lock(&e_line->lock);

		if (test_bit(bit, e_line->erase_bitmap)) {
@@ -188,4 +197,6 @@ retry: 
		*erase_ppa = pblk->luns[bit].bppa; /* set ch and lun */

		erase_ppa->a.blk = e_line->id;

	}



	return 0;

}

drivers/lightnvm/pblk-write.c

+20 −10
Original line number Diff line number Diff line
@@ -334,12 +334,13 @@ static int pblk_setup_w_rq(struct pblk *pblk, struct nvm_rq *rqd, 
	}



	if (likely(!e_line || !atomic_read(&e_line->left_eblks)))

		pblk_map_rq(pblk, rqd, c_ctx->sentry, lun_bitmap, valid, 0);

		ret = pblk_map_rq(pblk, rqd, c_ctx->sentry, lun_bitmap,

							valid, 0);

	else

		pblk_map_erase_rq(pblk, rqd, c_ctx->sentry, lun_bitmap,

		ret = pblk_map_erase_rq(pblk, rqd, c_ctx->sentry, lun_bitmap,

							valid, erase_ppa);



	return 0;

	return ret;

}



static int pblk_calc_secs_to_sync(struct pblk *pblk, unsigned int secs_avail,
@@ -563,7 +564,7 @@ static void pblk_free_write_rqd(struct pblk *pblk, struct nvm_rq *rqd) 
							c_ctx->nr_padded);

}



static int pblk_submit_write(struct pblk *pblk)

static int pblk_submit_write(struct pblk *pblk, int *secs_left)

{

	struct bio *bio;

	struct nvm_rq *rqd;
@@ -572,6 +573,8 @@ static int pblk_submit_write(struct pblk *pblk) 
	unsigned long pos;

	unsigned int resubmit;



	*secs_left = 0;



	spin_lock(&pblk->resubmit_lock);

	resubmit = !list_empty(&pblk->resubmit_list);

	spin_unlock(&pblk->resubmit_lock);
@@ -601,17 +604,17 @@ static int pblk_submit_write(struct pblk *pblk) 
		 */

		secs_avail = pblk_rb_read_count(&pblk->rwb);

		if (!secs_avail)

			return 1;

			return 0;



		secs_to_flush = pblk_rb_flush_point_count(&pblk->rwb);

		if (!secs_to_flush && secs_avail < pblk->min_write_pgs)

			return 1;

			return 0;



		secs_to_sync = pblk_calc_secs_to_sync(pblk, secs_avail,

					secs_to_flush);

		if (secs_to_sync > pblk->max_write_pgs) {

			pblk_err(pblk, "bad buffer sync calculation\n");

			return 1;

			return 0;

		}



		secs_to_com = (secs_to_sync > secs_avail) ?
@@ -640,6 +643,7 @@ static int pblk_submit_write(struct pblk *pblk) 
	atomic_long_add(secs_to_sync, &pblk->sub_writes);

#endif



	*secs_left = 1;

	return 0;



fail_free_bio:
@@ -648,16 +652,22 @@ fail_put_bio: 
	bio_put(bio);

	pblk_free_rqd(pblk, rqd, PBLK_WRITE);



	return 1;

	return -EINTR;

}



int pblk_write_ts(void *data)

{

	struct pblk *pblk = data;

	int secs_left;

	int write_failure = 0;



	while (!kthread_should_stop()) {

		if (!pblk_submit_write(pblk))

		if (!write_failure) {

			write_failure = pblk_submit_write(pblk, &secs_left);



			if (secs_left)

				continue;

		}

		set_current_state(TASK_INTERRUPTIBLE);

		io_schedule();

	}

drivers/lightnvm/pblk.h

+2 −2
Original line number Diff line number Diff line
@@ -871,10 +871,10 @@ int pblk_write_gc_to_cache(struct pblk *pblk, struct pblk_gc_rq *gc_rq); 
/*

 * pblk map

 */

void pblk_map_erase_rq(struct pblk *pblk, struct nvm_rq *rqd,

int pblk_map_erase_rq(struct pblk *pblk, struct nvm_rq *rqd,

		       unsigned int sentry, unsigned long *lun_bitmap,

		       unsigned int valid_secs, struct ppa_addr *erase_ppa);

void pblk_map_rq(struct pblk *pblk, struct nvm_rq *rqd, unsigned int sentry,

int pblk_map_rq(struct pblk *pblk, struct nvm_rq *rqd, unsigned int sentry,

		 unsigned long *lun_bitmap, unsigned int valid_secs,

		 unsigned int off);

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