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Subject[PATCH 02/11] lightnvm: pblk: recheck for bad lines at runtime
Date
Bad blocks can grow at runtime. Check that the number of valid blocks in
a line are within the sanity threshold before allocating the line for
new writes.

Signed-off-by: Javier González <javier@cnexlabs.com>
---
drivers/lightnvm/pblk-core.c | 38 ++++++++++++++++++++++++++++----------
drivers/lightnvm/pblk-init.c | 11 +++++++----
2 files changed, 35 insertions(+), 14 deletions(-)

diff --git a/drivers/lightnvm/pblk-core.c b/drivers/lightnvm/pblk-core.c
index ceacd10a043e..128101f9e606 100644
--- a/drivers/lightnvm/pblk-core.c
+++ b/drivers/lightnvm/pblk-core.c
@@ -1174,7 +1174,8 @@ static int pblk_prepare_new_line(struct pblk *pblk, struct pblk_line *line)
static int pblk_line_prepare(struct pblk *pblk, struct pblk_line *line)
{
struct pblk_line_meta *lm = &pblk->lm;
- int blk_to_erase;
+ int blk_in_line = atomic_read(&line->blk_in_line);
+ int blk_to_erase, ret;

line->map_bitmap = kzalloc(lm->sec_bitmap_len, GFP_ATOMIC);
if (!line->map_bitmap)
@@ -1183,8 +1184,8 @@ static int pblk_line_prepare(struct pblk *pblk, struct pblk_line *line)
/* will be initialized using bb info from map_bitmap */
line->invalid_bitmap = kmalloc(lm->sec_bitmap_len, GFP_ATOMIC);
if (!line->invalid_bitmap) {
- kfree(line->map_bitmap);
- return -ENOMEM;
+ ret = -ENOMEM;
+ goto fail_free_map_bitmap;
}

/* Bad blocks do not need to be erased */
@@ -1199,16 +1200,19 @@ static int pblk_line_prepare(struct pblk *pblk, struct pblk_line *line)
blk_to_erase = pblk_prepare_new_line(pblk, line);
line->state = PBLK_LINESTATE_FREE;
} else {
- blk_to_erase = atomic_read(&line->blk_in_line);
+ blk_to_erase = blk_in_line;
+ }
+
+ if (blk_in_line < lm->min_blk_line) {
+ ret = -EAGAIN;
+ goto fail_free_invalid_bitmap;
}

if (line->state != PBLK_LINESTATE_FREE) {
- kfree(line->map_bitmap);
- kfree(line->invalid_bitmap);
- spin_unlock(&line->lock);
WARN(1, "pblk: corrupted line %d, state %d\n",
line->id, line->state);
- return -EAGAIN;
+ ret = -EINTR;
+ goto fail_free_invalid_bitmap;
}

line->state = PBLK_LINESTATE_OPEN;
@@ -1222,6 +1226,16 @@ static int pblk_line_prepare(struct pblk *pblk, struct pblk_line *line)
kref_init(&line->ref);

return 0;
+
+fail_free_invalid_bitmap:
+ spin_unlock(&line->lock);
+ kfree(line->invalid_bitmap);
+ line->invalid_bitmap = NULL;
+fail_free_map_bitmap:
+ kfree(line->map_bitmap);
+ line->map_bitmap = NULL;
+
+ return ret;
}

int pblk_line_recov_alloc(struct pblk *pblk, struct pblk_line *line)
@@ -1292,10 +1306,14 @@ struct pblk_line *pblk_line_get(struct pblk *pblk)

ret = pblk_line_prepare(pblk, line);
if (ret) {
- if (ret == -EAGAIN) {
+ switch (ret) {
+ case -EAGAIN:
+ list_add(&line->list, &l_mg->bad_list);
+ goto retry;
+ case -EINTR:
list_add(&line->list, &l_mg->corrupt_list);
goto retry;
- } else {
+ default:
pr_err("pblk: failed to prepare line %d\n", line->id);
list_add(&line->list, &l_mg->free_list);
l_mg->nr_free_lines++;
diff --git a/drivers/lightnvm/pblk-init.c b/drivers/lightnvm/pblk-init.c
index dee64f91227d..8f8c9abd14fc 100644
--- a/drivers/lightnvm/pblk-init.c
+++ b/drivers/lightnvm/pblk-init.c
@@ -127,10 +127,8 @@ static int pblk_l2p_recover(struct pblk *pblk, bool factory_init)
if (!line) {
/* Configure next line for user data */
line = pblk_line_get_first_data(pblk);
- if (!line) {
- pr_err("pblk: line list corrupted\n");
+ if (!line)
return -EFAULT;
- }
}

return 0;
@@ -141,6 +139,7 @@ static int pblk_l2p_init(struct pblk *pblk, bool factory_init)
sector_t i;
struct ppa_addr ppa;
size_t map_size;
+ int ret = 0;

map_size = pblk_trans_map_size(pblk);
pblk->trans_map = vmalloc(map_size);
@@ -152,7 +151,11 @@ static int pblk_l2p_init(struct pblk *pblk, bool factory_init)
for (i = 0; i < pblk->rl.nr_secs; i++)
pblk_trans_map_set(pblk, i, ppa);

- return pblk_l2p_recover(pblk, factory_init);
+ ret = pblk_l2p_recover(pblk, factory_init);
+ if (ret)
+ vfree(pblk->trans_map);
+
+ return ret;
}

static void pblk_rwb_free(struct pblk *pblk)
--
2.7.4
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