From: Joe Thornber <ejt@xxxxxxxxxx>
This patch has been added to the 4.1 stable tree. If you have any
objections, please let us know.
===============
[ Upstream commit 2eae9e4489b4cf83213fa3bd508b5afca3f01780 ]
If a transaction abort has failed then we can no longer use the metadata
device. Typically this happens if the superblock is unreadable.
This fix addresses a crash seen during metadata device failure testing.
Fixes: 8a01a6af75 ("dm thin: prefetch missing metadata pages")
Cc: stable@xxxxxxxxxxxxxxx # 3.19+
Signed-off-by: Joe Thornber <ejt@xxxxxxxxxx>
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
---
drivers/md/dm-thin-metadata.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/md/dm-thin-metadata.c b/drivers/md/dm-thin-metadata.c
index cde1d67..9b4f73e 100644
--- a/drivers/md/dm-thin-metadata.c
+++ b/drivers/md/dm-thin-metadata.c
@@ -1803,5 +1803,8 @@ bool dm_pool_metadata_needs_check(struct dm_pool_metadata *pmd)
void dm_pool_issue_prefetches(struct dm_pool_metadata *pmd)
{
- dm_tm_issue_prefetches(pmd->tm);
+ down_read(&pmd->root_lock);
+ if (!pmd->fail_io)
+ dm_tm_issue_prefetches(pmd->tm);
+ up_read(&pmd->root_lock);
}
--
2.5.0
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