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From 1a7d0d17b3b2aeae3c48895ee60da17e3ee27f32 Mon Sep 17 00:00:00 2001
From: Max Reitz <>
Date: Fri, 24 Oct 2014 08:18:00 +0200
Subject: [PATCH 12/19] qemu-img: fix rebase src_cache option documentation

Message-id: <>
Patchwork-id: 61865
O-Subject: [RHEL-7.1 qemu-kvm PATCH v2 4/4] qemu-img: fix rebase src_cache option documentation
Bugzilla: 1138691
RH-Acked-by: Laszlo Ersek <>
RH-Acked-by: Markus Armbruster <>
RH-Acked-by: Kevin Wolf <>

From: Stefan Hajnoczi <>

The src_cache option (-T) specifies the cache mode for backing files.
It applies both the image's old backing file as well as the new backing

  ret = bdrv_open(&bs_old_backing, backing_name, NULL, NULL, src_flags,
                  old_backing_drv, &local_err);
  if (ret) {
  if (out_baseimg[0]) {
      bs_new_backing = bdrv_new("new_backing", &error_abort);
      ret = bdrv_open(&bs_new_backing, out_baseimg, NULL, NULL, src_flags,
                      new_backing_drv, &local_err);
      if (ret) {

The documentation only mentions the new backing file but it really
applies to both.

Suggested-by: Jeff Nelson <>
Signed-off-by: Stefan Hajnoczi <>
Reviewed-by: Max Reitz <>
(cherry picked from commit 3ba6796d080a90440573ef29d657e4902be7e238)

Signed-off-by: Max Reitz <>
Signed-off-by: Miroslav Rezanina <>
 qemu-img.texi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/qemu-img.texi b/qemu-img.texi
index 4b7a331..5f99ebb 100644
--- a/qemu-img.texi
+++ b/qemu-img.texi
@@ -314,7 +314,7 @@ string), then the image is rebased onto no backing file (i.e. it will exist
 independently of any backing file).
 @var{cache} specifies the cache mode to be used for @var{filename}, whereas
-@var{src_cache} specifies the cache mode for reading the new backing file.
+@var{src_cache} specifies the cache mode for reading backing files.
 There are two different modes in which @code{rebase} can operate:
 @table @option