Commit 2eae9e44 authored Mar 01, 2016 by Joe Thornber Committed by Mike Snitzer Mar 10, 2016

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: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

parent 4df2bf46

drivers/md/dm-thin-metadata.c

+4 −1

Original line number	Diff line number	Diff line
		@@ -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)
		{
		down_read(&pmd->root_lock);
		if (!pmd->fail_io)
		dm_tm_issue_prefetches(pmd->tm);
		up_read(&pmd->root_lock);
		}