Commit 2eae9e44 authored by Joe Thornber's avatar Joe Thornber Committed by Mike Snitzer

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

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: 8a01a6af ("dm thin: prefetch missing metadata pages")
Cc: stable@vger.kernel.org # 3.19+
Signed-off-by: default avatarJoe Thornber <ejt@redhat.com>
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
parent 4df2bf46
...@@ -1981,5 +1981,8 @@ bool dm_pool_metadata_needs_check(struct dm_pool_metadata *pmd) ...@@ -1981,5 +1981,8 @@ bool dm_pool_metadata_needs_check(struct dm_pool_metadata *pmd)
void dm_pool_issue_prefetches(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);
} }
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