From c466d0a410e2618c6a69ec4d7179ea5be97121a5 Mon Sep 17 00:00:00 2001

From: Markus Armbruster <armbru@redhat.com>

Date: Tue, 17 Dec 2013 06:46:36 +0100

Subject: QMP: Forward-port __com.redhat_drive_add from RHEL-6

RH-Author: Markus Armbruster <armbru@redhat.com>

Message-id: <1387262799-10350-4-git-send-email-armbru@redhat.com>

Patchwork-id: 56294

O-Subject: [PATCH v2 3/6] QMP: Forward-port __com.redhat_drive_add from RHEL-6

Bugzilla: 889051

RH-Acked-by: Fam Zheng <famz@redhat.com>

RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>

RH-Acked-by: Luiz Capitulino <lcapitulino@redhat.com>

From: Markus Armbruster <armbru@redhat.com>

Code taken from RHEL-6 as of qemu-kvm-0.12.1.2-2.418.el6, backported

and fixed up as follows:

* Update simple_drive_add() for commit 4e89978 "qemu-option:

  qemu_opts_from_qdict(): use error_set()".

* Update simple_drive_add() for commit 2d0d283 "Support default block

  interfaces per QEMUMachine".

* Add comment explaining drive_init() error reporting hacks to

  simple_drive_add().

* qemu-monitor.hx has been split into qmp-commands.hx and

  hmp-commands.hx.  Copy the QMP parts to qmp-commands.hx.  Clean up

  second example slightly.

* Trailing whitespace cleaned up.

Signed-off-by: Markus Armbruster <armbru@redhat.com>

diff --git a/device-hotplug.c b/device-hotplug.c

index 68b9496..7d4dc92 100644

--- a/device-hotplug.c

+++ b/device-hotplug.c

@@ -79,3 +79,78 @@ err:

         blk_unref(blk_by_legacy_dinfo(dinfo));

     }

 }

+

+static void check_parm(const char *key, QObject *obj, void *opaque)

+{

+    static const char *valid_keys[] = {

+        "id", "cyls", "heads", "secs", "trans", "media", "snapshot",

+        "file", "cache", "aio", "format", "serial", "rerror", "werror",

+        "readonly", "copy-on-read",

+#ifdef CONFIG_BLOCK_IO_THROTTLING

+        "bps", "bps_rd", "bps_wr", "iops", "iops_rd", "iops_wr",

+#endif

+        NULL

+

+    };

+    int *stopped = opaque;

+    const char **p;

+

+    if (*stopped) {

+        return;

+    }

+

+    for (p = valid_keys; *p; p++) {

+        if (!strcmp(key, *p)) {

+            return;

+        }

+    }

+

+    qerror_report(QERR_INVALID_PARAMETER, key);

+    *stopped = 1;

+}

+

+int simple_drive_add(Monitor *mon, const QDict *qdict, QObject **ret_data)

+{

+    int stopped;

+    Error *local_err = NULL;

+    QemuOpts *opts;

+    DriveInfo *dinfo;

+    MachineClass *mc;

+

+    if (!qdict_haskey(qdict, "id")) {

+        qerror_report(QERR_MISSING_PARAMETER, "id");

+        return -1;

+    }

+

+    stopped = 0;

+    qdict_iter(qdict, check_parm, &stopped);

+    if (stopped) {

+        return -1;

+    }

+

+    opts = qemu_opts_from_qdict(&qemu_drive_opts, qdict, &local_err);

+    if (!opts) {

+        qerror_report_err(local_err);

+        error_free(local_err);

+        return -1;

+    }

+    qemu_opt_set(opts, "if", "none", &error_abort);

+    mc = MACHINE_GET_CLASS(current_machine);

+    dinfo = drive_new(opts, mc->block_default_type);

+    if (!dinfo) {

+        /*

+         * drive_new() reports some errors with qerror_report_err(),

+         * and some with error_report().  The latter vanish without

+         * trace in monitor_vprintf().  See also the rather optimistic

+         * upstream commit 74ee59a.  Emit a generic error here.  If a

+         * prior error from qerror_report_err() is pending, it'll get

+         * ignored.

+         */

+        qerror_report(QERR_DEVICE_INIT_FAILED,

+                      qemu_opts_id(opts));

+        qemu_opts_del(opts);

+        return -1;

+    }

+

+    return 0;

+}

diff --git a/include/sysemu/blockdev.h b/include/sysemu/blockdev.h

index 7ca59b5..4478fc8 100644

--- a/include/sysemu/blockdev.h

+++ b/include/sysemu/blockdev.h

@@ -67,4 +67,6 @@ void qmp_change_blockdev(const char *device, const char *filename,

                          const char *format, Error **errp);

 void hmp_commit(Monitor *mon, const QDict *qdict);

 int hmp_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data);

+

+int simple_drive_add(Monitor *mon, const QDict *qdict, QObject **ret_data);

 #endif

diff --git a/qmp-commands.hx b/qmp-commands.hx

index 514ef73..6d47a99 100644

--- a/qmp-commands.hx

+++ b/qmp-commands.hx

@@ -106,6 +106,52 @@ Example:

 Note: The "force" argument defaults to false.

 EQMP

+    {

+        .name       = RFQDN_REDHAT "drive_add",

+        .args_type  = "simple-drive:O",

+        .params     = "id=name,[file=file][,format=f][,media=d]...",

+        .help       = "Create a drive similar to -device if=none.",

+	.user_print = monitor_user_noop,

+        .mhandler.cmd_new = simple_drive_add,

+    },

+

+SQMP

+__com.redhat_drive_add

+----------------------

+

+Create a drive similar to -device if=none.

+

+Arguments:

+

+- "id": Drive ID, must be unique (json-string)

+- "file": Disk image (json-string, optional)

+- "format": Disk format (json-string, optional)

+- "aio": How to perform asynchronous disk I/O (json-string, optional)

+- "cache": Host cache use policy (json-string, optional)

+- "cyls", "heads", "secs": Disk geometry (json-int, optional)

+- "trans": BIOS translation mode (json-string, optional)

+- "media": Media type (json-string, optional)

+- "readonly": Open image read-only (json-bool, optional)

+- "rerror": What to do on read error (json-string, optional)

+- "werror": What to do on write error (json-string, optional)

+- "serial": Drive serial number (json-string, optional)

+- "snapshot": Enable snapshot mode (json-bool, optional)

+- "copy-on-read": Enable copy-on-read mode (json-bool, optional)

+

+Example:

+

+1. Add a drive without medium:

+

+-> { "execute": "__com.redhat_drive_add", "arguments": { "id": "foo" } }

+<- {"return": {}}

+

+2. Add a drive with medium:

+

+-> { "execute": "__com.redhat_drive_add",

+     "arguments": { "id": "bar", "file": "tmp.qcow2", "format": "qcow2" } }

+<- {"return": {}}

+

+EQMP

     {

         .name       = RFQDN_REDHAT "drive_del",