File 0059-qemu-img-Convert-by-cluster-size-if.patch of Package qemu.656

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File 0059-qemu-img-Convert-by-cluster-size-if.patch of Package qemu.656

From ebc3a45d8505dba8b351345cdb96a25067edb2b0 Mon Sep 17 00:00:00 2001
From: Fam Zheng <famz@redhat.com>
Date: Tue, 6 May 2014 21:08:43 +0800
Subject: [PATCH] qemu-img: Convert by cluster size if target is compressed

If target block driver forces compression, qemu-img convert needs to
write by cluster size as well as "-c" option.

Particularly, this applies for converting to VMDK streamOptimized
format.

Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
(cherry picked from commit 85f49cad879adfb5c3cbdc47ca3c3b50eb8f40bc)
[BR: FATE#317741]
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 include/block/block.h | 4 ++++
 qemu-img.c            | 1 +
 2 files changed, 5 insertions(+)

diff --git a/include/block/block.h b/include/block/block.h
index b3230a2..494a745 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -34,6 +34,10 @@ typedef struct BlockDriverInfo {
      * opened with BDRV_O_UNMAP flag for this to work.
      */
     bool can_write_zeroes_with_unmap;
+    /*
+     * True if this block driver only supports compressed writes
+     */
+    bool needs_compressed_writes;
 } BlockDriverInfo;
 
 typedef struct BlockFragInfo {
diff --git a/qemu-img.c b/qemu-img.c
index c594edf..26700e3 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -1464,6 +1464,7 @@ static int img_convert(int argc, char **argv)
             goto out;
         }
     } else {
+        compress = compress || bdi.needs_compressed_writes;
         cluster_sectors = bdi.cluster_size / BDRV_SECTOR_SIZE;
     }

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File 0059-qemu-img-Convert-by-cluster-size-if.patch of Package qemu.656

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