aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/lightnvm
diff options
context:
space:
mode:
authorHans Holmberg <hans.holmberg@cnexlabs.com>2017-10-13 14:46:40 +0200
committerJens Axboe <axboe@kernel.dk>2017-10-13 08:34:57 -0600
commitc55861926a78bf129e06bd3372b34225f4968757 (patch)
tree13b2521d3ea7845b85e46e37dc61249b37521ec2 /drivers/lightnvm
parent1edebacf8b736774d2f160512aec721f47e1f5ac (diff)
lightnvm: pblk: add l2p crc debug printouts
Print the CRC of the logical-to-physical mapping during exit and after recovering the L2P table to facilitate detection of meta data corruption/recovery issues. The CRC printed after recovery should match the CRC printed during the previous exit - if it doesn't this indicates that either the meta data written to the disk is corrupt or recovery failed. Signed-off-by: Hans Holmberg <hans.holmberg@cnexlabs.com> Signed-off-by: Matias Bjørling <m@bjorling.me> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/lightnvm')
-rw-r--r--drivers/lightnvm/pblk-init.c39
1 files changed, 34 insertions, 5 deletions
diff --git a/drivers/lightnvm/pblk-init.c b/drivers/lightnvm/pblk-init.c
index ad9f014a086b..52c85f4f672d 100644
--- a/drivers/lightnvm/pblk-init.c
+++ b/drivers/lightnvm/pblk-init.c
@@ -76,6 +76,28 @@ static blk_qc_t pblk_make_rq(struct request_queue *q, struct bio *bio)
return BLK_QC_T_NONE;
}
+static size_t pblk_trans_map_size(struct pblk *pblk)
+{
+ int entry_size = 8;
+
+ if (pblk->ppaf_bitsize < 32)
+ entry_size = 4;
+
+ return entry_size * pblk->rl.nr_secs;
+}
+
+#ifdef CONFIG_NVM_DEBUG
+static u32 pblk_l2p_crc(struct pblk *pblk)
+{
+ size_t map_size;
+ u32 crc = ~(u32)0;
+
+ map_size = pblk_trans_map_size(pblk);
+ crc = crc32_le(crc, pblk->trans_map, map_size);
+ return crc;
+}
+#endif
+
static void pblk_l2p_free(struct pblk *pblk)
{
vfree(pblk->trans_map);
@@ -85,12 +107,10 @@ static int pblk_l2p_init(struct pblk *pblk)
{
sector_t i;
struct ppa_addr ppa;
- int entry_size = 8;
-
- if (pblk->ppaf_bitsize < 32)
- entry_size = 4;
+ size_t map_size;
- pblk->trans_map = vmalloc(entry_size * pblk->rl.nr_secs);
+ map_size = pblk_trans_map_size(pblk);
+ pblk->trans_map = vmalloc(map_size);
if (!pblk->trans_map)
return -ENOMEM;
@@ -508,6 +528,10 @@ static int pblk_lines_configure(struct pblk *pblk, int flags)
}
}
+#ifdef CONFIG_NVM_DEBUG
+ pr_info("pblk init: L2P CRC: %x\n", pblk_l2p_crc(pblk));
+#endif
+
/* Free full lines directly as GC has not been started yet */
pblk_gc_free_full_lines(pblk);
@@ -901,6 +925,11 @@ static void pblk_exit(void *private)
down_write(&pblk_lock);
pblk_gc_exit(pblk);
pblk_tear_down(pblk);
+
+#ifdef CONFIG_NVM_DEBUG
+ pr_info("pblk exit: L2P CRC: %x\n", pblk_l2p_crc(pblk));
+#endif
+
pblk_free(pblk);
up_write(&pblk_lock);
}

Privacy Policy