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dm thin metadata: don't issue prefetches if a transaction abort has failed

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commit 2eae9e4489 upstream.

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")
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Joe Thornber
2016-03-01 10:58:44 +00:00
committed by Greg Kroah-Hartman
parent 5504a47088
commit 291e2b3900
1 changed files with 4 additions and 1 deletions
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5
drivers/md/dm-thin-metadata.c
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@@ -1943,5 +1943,8 @@ 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);
}