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Re: [Qemu-devel] [PATCH] Add the drive-reopen command
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCH] Add the drive-reopen command |
Date: |
Tue, 06 Mar 2012 08:56:29 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:10.0.1) Gecko/20120216 Thunderbird/10.0.1 |
Il 05/03/2012 20:36, Federico Simoncelli ha scritto:
> Signed-off-by: Federico Simoncelli <address@hidden>
> ---
> blockdev.c | 40 +++++++++++++++++++++++++++-------------
> hmp-commands.hx | 16 ++++++++++++++++
> hmp.c | 11 +++++++++++
> hmp.h | 1 +
> qapi-schema.json | 22 ++++++++++++++++++++++
> 5 files changed, 77 insertions(+), 13 deletions(-)
>
> diff --git a/blockdev.c b/blockdev.c
> index 058b6d5..56da5c9 100644
> --- a/blockdev.c
> +++ b/blockdev.c
> @@ -646,9 +646,8 @@ void do_commit(Monitor *mon, const QDict *qdict)
> }
> }
>
> -void qmp_blockdev_snapshot_sync(const char *device, const char
> *snapshot_file,
> - bool has_format, const char *format,
> - Error **errp)
> +static void change_blockdev_image(const char *device, const char
> *new_image_file,
> + const char *format, bool create, Error
> **errp)
> {
> BlockDriverState *bs;
> BlockDriver *drv, *old_drv, *proto_drv;
> @@ -671,7 +670,7 @@ void qmp_blockdev_snapshot_sync(const char *device, const
> char *snapshot_file,
> old_drv = bs->drv;
> flags = bs->open_flags;
>
> - if (!has_format) {
> + if (!format) {
> format = "qcow2";
> }
>
> @@ -681,24 +680,26 @@ void qmp_blockdev_snapshot_sync(const char *device,
> const char *snapshot_file,
> return;
> }
>
> - proto_drv = bdrv_find_protocol(snapshot_file);
> + proto_drv = bdrv_find_protocol(new_image_file);
> if (!proto_drv) {
> error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
> return;
> }
>
> - ret = bdrv_img_create(snapshot_file, format, bs->filename,
> - bs->drv->format_name, NULL, -1, flags);
> - if (ret) {
> - error_set(errp, QERR_UNDEFINED_ERROR);
> - return;
> + if (create) {
> + ret = bdrv_img_create(new_image_file, format, bs->filename,
> + bs->drv->format_name, NULL, -1, flags);
> + if (ret) {
> + error_set(errp, QERR_UNDEFINED_ERROR);
> + return;
> + }
> }
>
> bdrv_drain_all();
> bdrv_flush(bs);
>
> bdrv_close(bs);
> - ret = bdrv_open(bs, snapshot_file, flags, drv);
> + ret = bdrv_open(bs, new_image_file, flags, drv);
> /*
> * If reopening the image file we just created fails, fall back
> * and try to re-open the original image. If that fails too, we
> @@ -709,11 +710,25 @@ void qmp_blockdev_snapshot_sync(const char *device,
> const char *snapshot_file,
> if (ret != 0) {
> error_set(errp, QERR_OPEN_FILE_FAILED, old_filename);
> } else {
> - error_set(errp, QERR_OPEN_FILE_FAILED, snapshot_file);
> + error_set(errp, QERR_OPEN_FILE_FAILED, new_image_file);
> }
> }
> }
>
> +void qmp_drive_reopen(const char *device, const char *new_image_file,
> + bool has_format, const char *format, Error **errp)
> +{
> + change_blockdev_image(device, new_image_file,
> + has_format ? format : NULL, false, errp);
> +}
> +
> +void qmp_blockdev_snapshot_sync(const char *device, const char
> *snapshot_file,
> + bool has_format, const char *format,
> + Error **errp)
> +{
> + change_blockdev_image(device, snapshot_file,
> + has_format ? format : NULL, true, errp);
> +}
>
> /* New and old BlockDriverState structs for group snapshots */
> typedef struct BlkTransactionStates {
> @@ -877,7 +892,6 @@ exit:
> return;
> }
>
> -
> static void eject_device(BlockDriverState *bs, int force, Error **errp)
> {
> if (bdrv_in_use(bs)) {
> diff --git a/hmp-commands.hx b/hmp-commands.hx
> index 64b3656..9e08123 100644
> --- a/hmp-commands.hx
> +++ b/hmp-commands.hx
> @@ -900,6 +900,22 @@ Snapshot device, using snapshot file as target if
> provided
> ETEXI
>
> {
> + .name = "drive-reopen",
> + .args_type = "device:B,new-image-file:s,format:s?",
> + .params = "device new-image-file [format]",
> + .help = "Assigns a new image file to a device.\n\t\t\t"
> + "The image will be opened using the format\n\t\t\t"
> + "specified or 'qcow2' by default.\n\t\t\t",
> + .mhandler.cmd = hmp_drive_reopen,
> + },
> +
> +STEXI
> address@hidden drive-reopen
> address@hidden drive-reopen
> +Assigns a new image file to a device.
> +ETEXI
> +
> + {
> .name = "drive_add",
> .args_type = "pci_addr:s,opts:s",
> .params = "[[<domain>:]<bus>:]<slot>\n"
> diff --git a/hmp.c b/hmp.c
> index 3a54455..ab069ad 100644
> --- a/hmp.c
> +++ b/hmp.c
> @@ -706,6 +706,17 @@ void hmp_snapshot_blkdev(Monitor *mon, const QDict
> *qdict)
> hmp_handle_error(mon, &errp);
> }
>
> +void hmp_drive_reopen(Monitor *mon, const QDict *qdict)
> +{
> + const char *device = qdict_get_str(qdict, "device");
> + const char *filename = qdict_get_str(qdict, "new-image-file");
> + const char *format = qdict_get_try_str(qdict, "format");
> + Error *errp = NULL;
> +
> + qmp_drive_reopen(device, filename, !!format, format, &errp);
> + hmp_handle_error(mon, &errp);
> +}
> +
> void hmp_migrate_cancel(Monitor *mon, const QDict *qdict)
> {
> qmp_migrate_cancel(NULL);
> diff --git a/hmp.h b/hmp.h
> index 5409464..e96926d 100644
> --- a/hmp.h
> +++ b/hmp.h
> @@ -48,6 +48,7 @@ void hmp_block_passwd(Monitor *mon, const QDict *qdict);
> void hmp_balloon(Monitor *mon, const QDict *qdict);
> void hmp_block_resize(Monitor *mon, const QDict *qdict);
> void hmp_snapshot_blkdev(Monitor *mon, const QDict *qdict);
> +void hmp_drive_reopen(Monitor *mon, const QDict *qdict);
> void hmp_migrate_cancel(Monitor *mon, const QDict *qdict);
> void hmp_migrate_set_downtime(Monitor *mon, const QDict *qdict);
> void hmp_migrate_set_speed(Monitor *mon, const QDict *qdict);
> diff --git a/qapi-schema.json b/qapi-schema.json
> index fd5973d..b33875d 100644
> --- a/qapi-schema.json
> +++ b/qapi-schema.json
> @@ -1214,6 +1214,28 @@
> 'data': { 'device': 'str', 'snapshot-file': 'str', '*format': 'str' } }
>
> ##
> +# @drive-reopen
> +#
> +# Assigns a new image file to a device.
> +#
> +# @device: the name of the device for which we are changing the image file.
> +#
> +# @new-image-file: the target of the new image. If the file doesn't exists
> the
> +# command will fail.
> +#
> +# @format: #optional the format of the new image, default is 'qcow2'.
> +#
> +# Returns: nothing on success
> +# If @device is not a valid block device, DeviceNotFound
> +# If @new-image-file can't be opened, OpenFileFailed
> +# If @format is invalid, InvalidBlockFormat
> +#
> +# Since 1.1
> +##
> +{ 'command': 'drive-reopen',
> + 'data': { 'device': 'str', 'new-image-file': 'str', '*format': 'str' } }
> +
> +##
> # @human-monitor-command:
> #
> # Execute a command on the human monitor and return the output.
I'm rebasing this patch and taking it into my series. Thanks!
Paolo