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qcow2: Restore L1 entry on l2_allocate failure

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If writing the L1 table to disk failed, we need to restore its old content in
memory to avoid inconsistencies.

Reported-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2010-06-07 16:43:22 +02:00
parent dd5b0d71d6
commit 68dba0bf45
1 changed files with 1 additions and 0 deletions
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block/qcow2-cluster.c
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@ -285,6 +285,7 @@ static int l2_allocate(BlockDriverState *bs, int l1_index, uint64_t **table)
return 0; return 0;
fail: fail:
s->l1_table[l1_index] = old_l2_offset;
qcow2_l2_cache_reset(bs); qcow2_l2_cache_reset(bs);
return ret; return ret;
} }