Signed-off-by: Federico Simoncelli <fsimo...@redhat.com> --- blockdev.c | 107 ++++++++++++++++++++++++++++++++++++++++++++++++------ hmp-commands.hx | 38 +++++++++++++++++++ hmp.c | 24 ++++++++++++ hmp.h | 2 + qapi-schema.json | 54 +++++++++++++++++++++++++++ 5 files changed, 213 insertions(+), 12 deletions(-)
diff --git a/blockdev.c b/blockdev.c index 2c132a3..f51bd6f 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 +710,93 @@ 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); +} + +static void qmp_blockdev_mirror(const char *device, const char *destination, + const char *new_image_file, Error **errp) +{ + BlockDriver *drv; + int i, j, escape; + char new_filename[2048], *filename; + + drv = bdrv_find_format("blkmirror"); + if (!drv) { + error_set(errp, QERR_INVALID_BLOCK_FORMAT, "blkmirror"); + return; + } + + escape = 0; + for (i = 0, j = 0; j < strlen(new_image_file); j++) { + loop: + if (!(i < sizeof(new_filename) - 2)) { + error_set(errp, QERR_INVALID_PARAMETER_VALUE, + "new-image-file", "shorter filename"); + return; + } + + if (new_image_file[j] == ':' || new_image_file[j] == '\\') { + if (!escape) { + new_filename[i++] = '\\', escape = 1; + goto loop; + } else { + escape = 0; + } + } + + new_filename[i++] = new_image_file[j]; + } + + filename = g_strdup_printf("blkmirror:%s:%s", new_filename, destination); + change_blockdev_image(device, filename, "blkmirror", false, errp); + g_free(filename); +} + +void qmp_blockdev_migrate(const char *device, bool incremental, + const char *destination, bool has_new_image_file, + const char *new_image_file, Error **errp) +{ + BlockDriverState *bs; + + bs = bdrv_find(device); + if (!bs) { + error_set(errp, QERR_DEVICE_NOT_FOUND, device); + return; + } + if (bdrv_in_use(bs)) { + error_set(errp, QERR_DEVICE_IN_USE, device); + return; + } + + if (incremental) { + if (!has_new_image_file) { + error_set(errp, QERR_INVALID_PARAMETER_VALUE, + "incremental", "a new image file"); + } else { + qmp_blockdev_mirror(device, destination, new_image_file, errp); + } + } else { + error_set(errp, QERR_NOT_SUPPORTED); + } +} + 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 573b823..4aacf2a 100644 --- a/hmp-commands.hx +++ b/hmp-commands.hx @@ -886,6 +886,44 @@ 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" + "This command is deprecated.", + .mhandler.cmd = hmp_drive_reopen, + }, + +STEXI +@item drive_reopen +@findex drive_reopen +Assigns a new image file to a device. +ETEXI + + { + .name = "blkdev_migrate", + .args_type = "incremental:-i,device:B,destination:s,new-image-file:s?", + .params = "device mode destination [new-image-file]", + .help = "Migrates the device to a new destination.\n\t\t\t" + "If the incremental (-i) option is used then\n\t\t\t" + "only the new writes are sent to the destination.\n\t\t\t" + "This method is particularly useful if used in\n\t\t\t" + "conjunction with new-image-file (a new image for\n\t\t\t" + "the device) allowing the current image to be\n\t\t\t" + "transferred to the destination by an external\n\t\t\t" + "manager.", + .mhandler.cmd = hmp_blkdev_migrate, + }, + +STEXI +@item blkdev_migrate +@findex blkdev_migrate +Migrates the device to a new destination. +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 8ff8c94..282d3e5 100644 --- a/hmp.c +++ b/hmp.c @@ -701,6 +701,30 @@ 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_blkdev_migrate(Monitor *mon, const QDict *qdict) +{ + bool incremental = qdict_get_try_bool(qdict, "incremental", 0); + const char *device = qdict_get_str(qdict, "device"); + const char *destination = qdict_get_str(qdict, "destination"); + const char *new_image_file = qdict_get_try_str(qdict, "new-image-file"); + Error *errp = NULL; + + qmp_blockdev_migrate(device, incremental, destination, + !!new_image_file, new_image_file, &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 18eecbd..3c66257 100644 --- a/hmp.h +++ b/hmp.h @@ -47,6 +47,8 @@ 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_blkdev_migrate(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 d02ee86..df1248c 100644 --- a/qapi-schema.json +++ b/qapi-schema.json @@ -1136,6 +1136,60 @@ '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 chainging 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 +# +# Notes: This command is deprecated. +# +# Since 1.1 +## + +{ 'command': 'drive-reopen', + 'data': { 'device': 'str', 'new-image-file': 'str', '*format': 'str' } } + +## +# @blockdev-migrate +# +# Migrates the device to a new destination. +# +# @device: the name of the block device to migrate. +# +# @incremental: if true only the new writes are sent to the destination. +# This method is particularly useful if used in conjunction +# with new-image-file allowing the current image to be +# transferred to the destination by an external manager. +# +# @destination: the destination of the block migration. +# +# @new-image-file: #optional an existing image file that will replace +# the current one in the device. +# +# Returns: nothing on success +# If @device is not a valid block device, DeviceNotFound +# If @mode is not a valid migration mode, InvalidParameterValue +# If @destination can't be opened, OpenFileFailed +# If @new-image-file can't be opened, OpenFileFailed +# +# Since 1.1 +## +{ 'command': 'blockdev-migrate', + 'data': { 'device': 'str', 'incremental' : 'bool', + 'destination': 'str', '*new-image-file': 'str' } } + +## # @human-monitor-command: # # Execute a command on the human monitor and return the output. -- 1.7.1