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[Qemu-devel] [6212] Fix compressed qcow2 (Gleb Natapov)
From: |
Anthony Liguori |
Subject: |
[Qemu-devel] [6212] Fix compressed qcow2 (Gleb Natapov) |
Date: |
Wed, 07 Jan 2009 16:43:13 +0000 |
Revision: 6212
http://svn.sv.gnu.org/viewvc/?view=rev&root=qemu&revision=6212
Author: aliguori
Date: 2009-01-07 16:43:13 +0000 (Wed, 07 Jan 2009)
Log Message:
-----------
Fix compressed qcow2 (Gleb Natapov)
Correctly calculate number of contiguous clusters.
Acked-by: Kevin Wolf <address@hidden>
Signed-off-by: Gleb Natapov <address@hidden>
Signed-off-by: Anthony Liguori <address@hidden>
Modified Paths:
--------------
trunk/block-qcow2.c
Modified: trunk/block-qcow2.c
===================================================================
--- trunk/block-qcow2.c 2009-01-07 16:41:47 UTC (rev 6211)
+++ trunk/block-qcow2.c 2009-01-07 16:43:13 UTC (rev 6212)
@@ -620,6 +620,9 @@
int i;
uint64_t offset = be64_to_cpu(l2_table[0]) & ~mask;
+ if (!offset)
+ return 0;
+
for (i = 0; i < nb_clusters; i++)
if (offset + i * cluster_size != (be64_to_cpu(l2_table[i]) & ~mask))
break;
@@ -981,6 +984,12 @@
/* how many available clusters ? */
while (i < nb_clusters) {
+ i += count_contiguous_clusters(nb_clusters - i, s->cluster_size,
+ &l2_table[l2_index + i], 0);
+
+ if(be64_to_cpu(l2_table[l2_index + i]))
+ break;
+
i += count_contiguous_free_clusters(nb_clusters - i,
&l2_table[l2_index + i]);
@@ -989,12 +998,6 @@
if ((cluster_offset & QCOW_OFLAG_COPIED) ||
(cluster_offset & QCOW_OFLAG_COMPRESSED))
break;
-
- i += count_contiguous_clusters(nb_clusters - i, s->cluster_size,
- &l2_table[l2_index + i], 0);
-
- if(be64_to_cpu(l2_table[l2_index + i]))
- break;
}
nb_clusters = i;
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