Thread (4 messages) 4 messages, 2 authors, 2018-10-26

Re: [PATCH] lightnvm: pblk: ignore the smeta oob area scan

From: Hans Holmberg <hidden>
Date: 2018-10-25 19:49:09

On Thu, Oct 25, 2018 at 2:44 AM Zhoujie Wu [off-list ref] wrote:
quoted hunk ↗ jump to hunk
The smeta area l2p mapping is empty, and actually the
recovery procedure only need to restore data sector's l2p
mapping. So ignore the smeta oob scan.

Signed-off-by: Zhoujie Wu <redacted>
---
 drivers/lightnvm/pblk-recovery.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/lightnvm/pblk-recovery.c b/drivers/lightnvm/pblk-recovery.c
index 5740b75..30f2616 100644
--- a/drivers/lightnvm/pblk-recovery.c
+++ b/drivers/lightnvm/pblk-recovery.c
@@ -334,6 +334,7 @@ static int pblk_recov_scan_oob(struct pblk *pblk, struct pblk_line *line,
                               struct pblk_recov_alloc p)
 {
        struct nvm_tgt_dev *dev = pblk->dev;
+       struct pblk_line_meta *lm = &pblk->lm;
        struct nvm_geo *geo = &dev->geo;
        struct ppa_addr *ppa_list;
        struct pblk_sec_meta *meta_list;
@@ -342,12 +343,12 @@ static int pblk_recov_scan_oob(struct pblk *pblk, struct pblk_line *line,
        void *data;
        dma_addr_t dma_ppa_list, dma_meta_list;
        __le64 *lba_list;
-       u64 paddr = 0;
+       u64 paddr = lm->smeta_sec;
Smeta is not guaranteed to start at paddr 0 - it will be placed in the
first non-bad chunk (in stripe order).
If the first chunk in the line is bad, smeta will be read and
lm->smeta_sec sectors will be lost.

You can use pblk_line_smeta_start to calculate the start address of smeta.

/ Hans
        bool padded = false;
        int rq_ppas, rq_len;
        int i, j;
        int ret;
-       u64 left_ppas = pblk_sec_in_open_line(pblk, line);
+       u64 left_ppas = pblk_sec_in_open_line(pblk, line) - lm->smeta_sec;

        if (pblk_line_wp_is_unbalanced(pblk, line))
                pblk_warn(pblk, "recovering unbalanced line (%d)\n", line->id);
--
1.9.1
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