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dm thin: re-establish read-only state when switching to fail mode
If the thin-pool transitioned to fail mode and the thin-pool's table were reloaded for some reason: the new table's default pool mode would be read-write, though it will transition to fail mode during resume. When the pool mode transitions directly from PM_WRITE to PM_FAIL we need to re-establish the intermediate read-only state in both the metadata and persistent-data block manager (as is usually done with the normal pool mode transition sequence: PM_WRITE -> PM_READ_ONLY -> PM_FAIL). Signed-off-by: Joe Thornber <ejt@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Cc: stable@vger.kernel.org
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@ -1400,6 +1400,7 @@ static void set_pool_mode(struct pool *pool, enum pool_mode mode)
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case PM_FAIL:
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DMERR("%s: switching pool to failure mode",
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dm_device_name(pool->pool_md));
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dm_pool_metadata_read_only(pool->pmd);
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pool->process_bio = process_bio_fail;
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pool->process_discard = process_bio_fail;
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pool->process_prepared_mapping = process_prepared_mapping_fail;
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