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Blame SOURCES/kvm-qemu-img-Allow-cache-mode-specification-for-amend.patch

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From bb18c8167f4b3a912e57ca4185e9e58d4d3a149b Mon Sep 17 00:00:00 2001
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From: Max Reitz <mreitz@redhat.com>
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Date: Fri, 24 Oct 2014 08:17:58 +0200
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Subject: [PATCH 10/19] qemu-img: Allow cache mode specification for amend
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Message-id: <1414138680-19600-3-git-send-email-mreitz@redhat.com>
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Patchwork-id: 61863
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O-Subject: [RHEL-7.1 qemu-kvm PATCH v2 2/4] qemu-img: Allow cache mode specification for amend
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Bugzilla: 1138691
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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RH-Acked-by: Markus Armbruster <armbru@redhat.com>
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RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
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qemu-img amend may extensively modify the target image, depending on the
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options to be amended (e.g. conversion to qcow2 compat level 0.10 from
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1.1 for an image with many unallocated zero clusters). Therefore it
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makes sense to allow the user to specify the cache mode to be used.
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Signed-off-by: Max Reitz <mreitz@redhat.com>
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Reviewed-by: Eric Blake <eblake@redhat.com>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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(cherry picked from commit bd39e6ed0b88a1473c652c97e731a156cccf16e2)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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Conflicts:
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	qemu-img.c
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QemuOpts are not used throughout the downstream block layer.
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Signed-off-by: Max Reitz <mreitz@redhat.com>
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---
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 qemu-img-cmds.hx |  4 ++--
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 qemu-img.c       | 19 +++++++++++++++----
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 qemu-img.texi    |  2 +-
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 3 files changed, 18 insertions(+), 7 deletions(-)
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diff --git a/qemu-img-cmds.hx b/qemu-img-cmds.hx
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index e590d46..5efdfe9 100644
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--- a/qemu-img-cmds.hx
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+++ b/qemu-img-cmds.hx
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@@ -70,8 +70,8 @@ STEXI
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 ETEXI
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 DEF("amend", img_amend,
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-    "amend [-q] [-f fmt] -o options filename")
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+    "amend [-q] [-f fmt] [-t cache] -o options filename")
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 STEXI
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-@item amend [-q] [-f @var{fmt}] -o @var{options} @var{filename}
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+@item amend [-q] [-f @var{fmt}] [-t @var{cache}] -o @var{options} @var{filename}
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 @end table
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 ETEXI
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diff --git a/qemu-img.c b/qemu-img.c
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index 25fdc37..1f28729 100644
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--- a/qemu-img.c
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+++ b/qemu-img.c
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@@ -2659,12 +2659,14 @@ static int img_amend(int argc, char **argv)
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     int c, ret = 0;
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     char *options = NULL;
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     QEMUOptionParameter *create_options = NULL, *options_param = NULL;
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-    const char *fmt = NULL, *filename;
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+    const char *fmt = NULL, *filename, *cache;
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+    int flags;
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     bool quiet = false;
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     BlockDriverState *bs = NULL;
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+    cache = BDRV_DEFAULT_CACHE;
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     for (;;) {
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-        c = getopt(argc, argv, "hqf:o:");
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+        c = getopt(argc, argv, "ho:f:t:q");
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         if (c == -1) {
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             break;
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         }
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@@ -2691,6 +2693,9 @@ static int img_amend(int argc, char **argv)
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             case 'f':
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                 fmt = optarg;
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                 break;
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+            case 't':
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+                cache = optarg;
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+                break;
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             case 'q':
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                 quiet = true;
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                 break;
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@@ -2713,8 +2718,14 @@ static int img_amend(int argc, char **argv)
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         help();
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     }
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-    bs = bdrv_new_open("image", filename, fmt,
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-                       BDRV_O_FLAGS | BDRV_O_RDWR, true, quiet);
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+    flags = BDRV_O_FLAGS | BDRV_O_RDWR;
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+    ret = bdrv_parse_cache_flags(cache, &flags);
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+    if (ret < 0) {
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+        error_report("Invalid cache option: %s", cache);
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+        goto out;
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+    }
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+
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+    bs = bdrv_new_open("image", filename, fmt, flags, true, quiet);
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     if (!bs) {
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         error_report("Could not open image '%s'", filename);
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         ret = -1;
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diff --git a/qemu-img.texi b/qemu-img.texi
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index 3d06e91..078fe81 100644
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--- a/qemu-img.texi
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+++ b/qemu-img.texi
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@@ -370,7 +370,7 @@ After using this command to grow a disk image, you must use file system and
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 partitioning tools inside the VM to actually begin using the new space on the
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 device.
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-@item amend [-f @var{fmt}] -o @var{options} @var{filename}
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+@item amend [-f @var{fmt}] [-t @var{cache}] -o @var{options} @var{filename}
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 Amends the image format specific @var{options} for the image file
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 @var{filename}. Not all file formats support this operation.
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-- 
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1.8.3.1
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