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Subject[PATCH 01/11] lightnvm: pblk: fail gracefully on line alloc. failure
Date
In the event of a line failing to allocate, fail gracefully and stop the
pipeline to avoid more write failing in the same place.

Signed-off-by: Javier González <javier@cnexlabs.com>
---
drivers/lightnvm/pblk-init.c | 5 +++++
drivers/lightnvm/pblk-map.c | 33 ++++++++++++++++++++++++---------
2 files changed, 29 insertions(+), 9 deletions(-)

diff --git a/drivers/lightnvm/pblk-init.c b/drivers/lightnvm/pblk-init.c
index 91a5bc2556a3..dee64f91227d 100644
--- a/drivers/lightnvm/pblk-init.c
+++ b/drivers/lightnvm/pblk-init.c
@@ -1047,6 +1047,11 @@ static int pblk_lines_init(struct pblk *pblk)
nr_free_chks += pblk_setup_line_meta(pblk, line, chunk_meta, i);
}

+ if (!nr_free_chks) {
+ pr_err("pblk: too many bad blocks prevent for sane instance\n");
+ return -EINTR;
+ }
+
pblk_set_provision(pblk, nr_free_chks);

kfree(chunk_meta);
diff --git a/drivers/lightnvm/pblk-map.c b/drivers/lightnvm/pblk-map.c
index 20dbaa89c9df..953ca31dda68 100644
--- a/drivers/lightnvm/pblk-map.c
+++ b/drivers/lightnvm/pblk-map.c
@@ -18,11 +18,11 @@

#include "pblk.h"

-static void pblk_map_page_data(struct pblk *pblk, unsigned int sentry,
- struct ppa_addr *ppa_list,
- unsigned long *lun_bitmap,
- struct pblk_sec_meta *meta_list,
- unsigned int valid_secs)
+static int pblk_map_page_data(struct pblk *pblk, unsigned int sentry,
+ struct ppa_addr *ppa_list,
+ unsigned long *lun_bitmap,
+ struct pblk_sec_meta *meta_list,
+ unsigned int valid_secs)
{
struct pblk_line *line = pblk_line_get_data(pblk);
struct pblk_emeta *emeta;
@@ -35,8 +35,14 @@ static void pblk_map_page_data(struct pblk *pblk, unsigned int sentry,
if (pblk_line_is_full(line)) {
struct pblk_line *prev_line = line;

+ /* If we cannot allocate a new line, make sure to store metadata
+ * on current line and then fail
+ */
line = pblk_line_replace_data(pblk);
pblk_line_close_meta(pblk, prev_line);
+
+ if (!line)
+ return -EINTR;
}

emeta = line->emeta;
@@ -74,6 +80,7 @@ static void pblk_map_page_data(struct pblk *pblk, unsigned int sentry,
}

pblk_down_rq(pblk, ppa_list, nr_secs, lun_bitmap);
+ return 0;
}

void pblk_map_rq(struct pblk *pblk, struct nvm_rq *rqd, unsigned int sentry,
@@ -87,8 +94,12 @@ void pblk_map_rq(struct pblk *pblk, struct nvm_rq *rqd, unsigned int sentry,

for (i = off; i < rqd->nr_ppas; i += min) {
map_secs = (i + min > valid_secs) ? (valid_secs % min) : min;
- pblk_map_page_data(pblk, sentry + i, &rqd->ppa_list[i],
- lun_bitmap, &meta_list[i], map_secs);
+ if (pblk_map_page_data(pblk, sentry + i, &rqd->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);
+ }
}
}

@@ -108,8 +119,12 @@ void pblk_map_erase_rq(struct pblk *pblk, struct nvm_rq *rqd,

for (i = 0; i < rqd->nr_ppas; i += min) {
map_secs = (i + min > valid_secs) ? (valid_secs % min) : min;
- pblk_map_page_data(pblk, sentry + i, &rqd->ppa_list[i],
- lun_bitmap, &meta_list[i], map_secs);
+ if (pblk_map_page_data(pblk, sentry + i, &rqd->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);
+ }

erase_lun = pblk_ppa_to_pos(geo, rqd->ppa_list[i]);

--
2.7.4
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