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[Qemu-devel] [PATCH] Fix cluster freeing in qcow2


From: Gleb Natapov
Subject: [Qemu-devel] [PATCH] Fix cluster freeing in qcow2
Date: Thu, 7 May 2009 11:31:44 +0300

Need to drop QCOW_OFLAG_COPIED from a cluster pointer before freeing it.

Add an explanation how thing meant to work.

Signed-off-by: Gleb Natapov <address@hidden>
diff --git a/block-qcow2.c b/block-qcow2.c
index 7840634..aca41b4 100644
--- a/block-qcow2.c
+++ b/block-qcow2.c
@@ -992,6 +992,12 @@ static int alloc_cluster_link_l2(BlockDriverState *bs, 
uint64_t cluster_offset,
         goto err;
 
     for (i = 0; i < m->nb_clusters; i++) {
+        /* if two concurrent writes happen to the same unallocated cluster
+        * each write allocates separate cluster and writes data concurrently.
+        * The first one to complete updates l2 table with pointer to its
+        * cluster the second one has to do RMW (which is done above by
+        * copy_sectors()), update l2 table with its cluster pointer and free
+        * old cluster. This is what this loop does */
         if(l2_table[l2_index + i] != 0)
             old_cluster[j++] = l2_table[l2_index + i];
 
@@ -1005,7 +1011,8 @@ static int alloc_cluster_link_l2(BlockDriverState *bs, 
uint64_t cluster_offset,
         goto err;
 
     for (i = 0; i < j; i++)
-        free_any_clusters(bs, be64_to_cpu(old_cluster[i]), 1);
+        free_any_clusters(bs, be64_to_cpu(old_cluster[i]) & ~QCOW_OFLAG_COPIED,
+                          1);
 
     ret = 0;
 err:
--
                        Gleb.




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