From: Igor Konopko <igor.j.konopko@intel.com>
To: mb@lightnvm.io
Cc: linux-block@vger.kernel.org, javier@cnexlabs.com,
hans.holmberg@cnexlabs.com, igor.j.konopko@intel.com
Subject: [PATCH v2 1/2] lightnvm: pblk: Do not overwrite ppa list with meta list
Date: Fri, 7 Dec 2018 09:25:49 +0100 [thread overview]
Message-ID: <20181207082550.10409-1-igor.j.konopko@intel.com> (raw)
Currently when using PBLK with 0 sized metadata both ppa list
and meta list points to the same memory since pblk_dma_meta_size()
returns 0 in that case.
This commit fix that issue by ensuring that pblk_dma_meta_size()
always returns space equal to sizeof(struct pblk_sec_meta) and thus
ppa list and meta list points to different memory address.
Even that in that case drive does not really care about meta_list
pointer, this is the easiest way to fix that issue without introducing
changes in many places in the code just for 0 sized metadata case.
The same approach needs to be also done for pblk_get_sec_meta()
since we also cannot point to the same memory address in meta buffer
when we are using it for pblk recovery process
Reported-by: Hans Holmberg <hans.holmberg@cnexlabs.com>
Signed-off-by: Igor Konopko <igor.j.konopko@intel.com>
---
drivers/lightnvm/pblk.h | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/lightnvm/pblk.h b/drivers/lightnvm/pblk.h
index bc40b1381ff6..85e38ed62f85 100644
--- a/drivers/lightnvm/pblk.h
+++ b/drivers/lightnvm/pblk.h
@@ -1388,12 +1388,15 @@ static inline unsigned int pblk_get_min_chks(struct pblk *pblk)
static inline struct pblk_sec_meta *pblk_get_meta(struct pblk *pblk,
void *meta, int index)
{
- return meta + pblk->oob_meta_size * index;
+ return meta +
+ max_t(int, sizeof(struct pblk_sec_meta), pblk->oob_meta_size)
+ * index;
}
static inline int pblk_dma_meta_size(struct pblk *pblk)
{
- return pblk->oob_meta_size * NVM_MAX_VLBA;
+ return max_t(int, sizeof(struct pblk_sec_meta), pblk->oob_meta_size)
+ * NVM_MAX_VLBA;
}
static inline int pblk_is_oob_meta_supported(struct pblk *pblk)
--
2.17.1
next reply other threads:[~2018-12-07 8:33 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-07 8:25 Igor Konopko [this message]
2018-12-07 8:25 ` [PATCH v2 2/2] lightnvm: pblk: Ensure that bio is not freed on recovery Igor Konopko
2018-12-07 12:01 ` Matias Bjørling
2018-12-07 12:00 ` [PATCH v2 1/2] lightnvm: pblk: Do not overwrite ppa list with meta list Matias Bjørling
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