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Blame SOURCES/kvm-blockdev-Don-t-disable-COR-automatically-with-blockd.patch

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From f511f5b093b500474168bb0c7e95b1a48a0d5d42 Mon Sep 17 00:00:00 2001
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From: Kevin Wolf <kwolf@redhat.com>
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Date: Tue, 5 Nov 2013 14:09:13 +0100
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Subject: [PATCH 60/87] blockdev: Don't disable COR automatically with blockdev-add
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RH-Author: Kevin Wolf <kwolf@redhat.com>
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Message-id: <1383660558-32096-20-git-send-email-kwolf@redhat.com>
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Patchwork-id: 55398
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O-Subject: [RHEL-7.0 qemu-kvm PATCH 19/24] blockdev: Don't disable COR automatically with blockdev-add
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Bugzilla: 978402
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RH-Acked-by: Fam Zheng <famz@redhat.com>
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RH-Acked-by: Max Reitz <mreitz@redhat.com>
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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If a read-only device is configured with copy-on-read=on, the old code
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only prints a warning and automatically disables copy on read. Make it
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a real error for blockdev-add.
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Reviewed-by: Max Reitz <mreitz@redhat.com>
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Reviewed-by: Eric Blake <eblake@redhat.com>
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(cherry picked from commit 0ebd24e0a203cf2852c310b59fbe050190dc6c8c)
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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---
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 block.c    |  9 +++++++--
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 blockdev.c | 31 +++++++++++++++++++++++++++----
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 2 files changed, 34 insertions(+), 6 deletions(-)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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 block.c    |    9 +++++++--
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 blockdev.c |   31 +++++++++++++++++++++++++++----
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 2 files changed, 34 insertions(+), 6 deletions(-)
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diff --git a/block.c b/block.c
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index c2b6930..d11661a 100644
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--- a/block.c
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+++ b/block.c
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@@ -746,8 +746,13 @@ static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file,
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     }
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     assert(bs->copy_on_read == 0); /* bdrv_new() and bdrv_close() make it so */
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-    if (!bs->read_only && (flags & BDRV_O_COPY_ON_READ)) {
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-        bdrv_enable_copy_on_read(bs);
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+    if (flags & BDRV_O_COPY_ON_READ) {
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+        if (!bs->read_only) {
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+            bdrv_enable_copy_on_read(bs);
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+        } else {
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+            error_setg(errp, "Can't use copy-on-read on read-only device");
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+            return -EINVAL;
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+        }
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     }
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     if (filename != NULL) {
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diff --git a/blockdev.c b/blockdev.c
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index d4b18c5..cbf01eb 100644
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--- a/blockdev.c
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+++ b/blockdev.c
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@@ -511,10 +511,6 @@ static DriveInfo *blockdev_init(QDict *bs_opts,
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     bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
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-    if (ro && copy_on_read) {
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-        error_report("warning: disabling copy_on_read on read-only drive");
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-    }
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-
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     QINCREF(bs_opts);
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     ret = bdrv_open(dinfo->bdrv, file, bs_opts, bdrv_flags, drv, &error);
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@@ -602,6 +598,18 @@ QemuOptsList qemu_legacy_drive_opts = {
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             .type = QEMU_OPT_STRING,
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             .help = "pci address (virtio only)",
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         },
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+
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+        /* Options that are passed on, but have special semantics with -drive */
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+        {
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+            .name = "read-only",
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+            .type = QEMU_OPT_BOOL,
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+            .help = "open drive file as read-only",
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+        },{
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+            .name = "copy-on-read",
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+            .type = QEMU_OPT_BOOL,
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+            .help = "copy read data from backing file into image file",
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+        },
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+
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         { /* end of list */ }
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     },
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 };
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@@ -617,6 +625,7 @@ DriveInfo *drive_init(QemuOpts *all_opts, BlockInterfaceType block_default_type)
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     int cyls, heads, secs, translation;
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     int max_devs, bus_id, unit_id, index;
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     const char *devaddr;
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+    bool read_only, copy_on_read;
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     Error *local_err = NULL;
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     /* Change legacy command line options into QMP ones */
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@@ -688,6 +697,20 @@ DriveInfo *drive_init(QemuOpts *all_opts, BlockInterfaceType block_default_type)
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         }
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     }
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+    /* copy-on-read is disabled with a warning for read-only devices */
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+    read_only = qemu_opt_get_bool(legacy_opts, "read-only", false);
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+    copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
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+
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+    if (read_only && copy_on_read) {
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+        error_report("warning: disabling copy-on-read on read-only drive");
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+        copy_on_read = false;
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+    }
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+
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+    qdict_put(bs_opts, "read-only",
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+              qstring_from_str(read_only ? "on" : "off"));
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+    qdict_put(bs_opts, "copy-on-read",
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+              qstring_from_str(copy_on_read ? "on" :"off"));
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+
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     /* Controller type */
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     value = qemu_opt_get(legacy_opts, "if");
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     if (value) {
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-- 
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1.7.1
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