--- /dev/null
+/*
+ * QEMU host block devices
+ *
+ * Copyright (c) 2003-2008 Fabrice Bellard
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * later. See the COPYING file in the top-level directory.
+ *
+ * This file incorporates work covered by the following copyright and
+ * permission notice:
+ *
+ * Copyright (c) 2003-2008 Fabrice Bellard
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "sysemu/block-backend.h"
+#include "sysemu/blockdev.h"
+#include "hw/block/block.h"
+#include "block/blockjob.h"
+#include "block/throttle-groups.h"
+#include "monitor/monitor.h"
+#include "qemu/error-report.h"
+#include "qemu/option.h"
+#include "qemu/config-file.h"
+#include "qapi/qmp/types.h"
+#include "qapi-visit.h"
+#include "qapi/qmp/qerror.h"
+#include "qapi/qmp-output-visitor.h"
+#include "qapi/util.h"
+#include "sysemu/sysemu.h"
+#include "block/block_int.h"
+#include "qmp-commands.h"
+#include "trace.h"
+#include "sysemu/arch_init.h"
+
+static const char *const if_name[IF_COUNT] = {
+ [IF_NONE] = "none",
+ [IF_IDE] = "ide",
+ [IF_SCSI] = "scsi",
+ [IF_FLOPPY] = "floppy",
+ [IF_PFLASH] = "pflash",
+ [IF_MTD] = "mtd",
+ [IF_SD] = "sd",
+ [IF_VIRTIO] = "virtio",
+ [IF_XEN] = "xen",
+};
+
+static int if_max_devs[IF_COUNT] = {
+ /*
+ * Do not change these numbers! They govern how drive option
+ * index maps to unit and bus. That mapping is ABI.
+ *
+ * All controllers used to imlement if=T drives need to support
+ * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
+ * Otherwise, some index values map to "impossible" bus, unit
+ * values.
+ *
+ * For instance, if you change [IF_SCSI] to 255, -drive
+ * if=scsi,index=12 no longer means bus=1,unit=5, but
+ * bus=0,unit=12. With an lsi53c895a controller (7 units max),
+ * the drive can't be set up. Regression.
+ */
+ [IF_IDE] = 2,
+ [IF_SCSI] = 7,
+};
+
+/**
+ * Boards may call this to offer board-by-board overrides
+ * of the default, global values.
+ */
+void override_max_devs(BlockInterfaceType type, int max_devs)
+{
+ BlockBackend *blk;
+ DriveInfo *dinfo;
+
+ if (max_devs <= 0) {
+ return;
+ }
+
+ for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
+ dinfo = blk_legacy_dinfo(blk);
+ if (dinfo->type == type) {
+ fprintf(stderr, "Cannot override units-per-bus property of"
+ " the %s interface, because a drive of that type has"
+ " already been added.\n", if_name[type]);
+ g_assert_not_reached();
+ }
+ }
+
+ if_max_devs[type] = max_devs;
+}
+
+/*
+ * We automatically delete the drive when a device using it gets
+ * unplugged. Questionable feature, but we can't just drop it.
+ * Device models call blockdev_mark_auto_del() to schedule the
+ * automatic deletion, and generic qdev code calls blockdev_auto_del()
+ * when deletion is actually safe.
+ */
+void blockdev_mark_auto_del(BlockBackend *blk)
+{
+ DriveInfo *dinfo = blk_legacy_dinfo(blk);
+ BlockDriverState *bs = blk_bs(blk);
+ AioContext *aio_context;
+
+ if (!dinfo) {
+ return;
+ }
+
+ aio_context = bdrv_get_aio_context(bs);
+ aio_context_acquire(aio_context);
+
+ if (bs->job) {
+ block_job_cancel(bs->job);
+ }
+
+ aio_context_release(aio_context);
+
+ dinfo->auto_del = 1;
+}
+
+void blockdev_auto_del(BlockBackend *blk)
+{
+ DriveInfo *dinfo = blk_legacy_dinfo(blk);
+
+ if (dinfo && dinfo->auto_del) {
+ blk_unref(blk);
+ }
+}
+
+/**
+ * Returns the current mapping of how many units per bus
+ * a particular interface can support.
+ *
+ * A positive integer indicates n units per bus.
+ * 0 implies the mapping has not been established.
+ * -1 indicates an invalid BlockInterfaceType was given.
+ */
+int drive_get_max_devs(BlockInterfaceType type)
+{
+ if (type >= IF_IDE && type < IF_COUNT) {
+ return if_max_devs[type];
+ }
+
+ return -1;
+}
+
+static int drive_index_to_bus_id(BlockInterfaceType type, int index)
+{
+ int max_devs = if_max_devs[type];
+ return max_devs ? index / max_devs : 0;
+}
+
+static int drive_index_to_unit_id(BlockInterfaceType type, int index)
+{
+ int max_devs = if_max_devs[type];
+ return max_devs ? index % max_devs : index;
+}
+
+QemuOpts *drive_def(const char *optstr)
+{
+ return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
+}
+
+QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
+ const char *optstr)
+{
+ QemuOpts *opts;
+
+ opts = drive_def(optstr);
+ if (!opts) {
+ return NULL;
+ }
+ if (type != IF_DEFAULT) {
+ qemu_opt_set(opts, "if", if_name[type], &error_abort);
+ }
+ if (index >= 0) {
+ qemu_opt_set_number(opts, "index", index, &error_abort);
+ }
+ if (file)
+ qemu_opt_set(opts, "file", file, &error_abort);
+ return opts;
+}
+
+DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
+{
+ BlockBackend *blk;
+ DriveInfo *dinfo;
+
+ for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
+ dinfo = blk_legacy_dinfo(blk);
+ if (dinfo && dinfo->type == type
+ && dinfo->bus == bus && dinfo->unit == unit) {
+ return dinfo;
+ }
+ }
+
+ return NULL;
+}
+
+bool drive_check_orphaned(void)
+{
+ BlockBackend *blk;
+ DriveInfo *dinfo;
+ bool rs = false;
+
+ for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
+ dinfo = blk_legacy_dinfo(blk);
+ /* If dinfo->bdrv->dev is NULL, it has no device attached. */
+ /* Unless this is a default drive, this may be an oversight. */
+ if (!blk_get_attached_dev(blk) && !dinfo->is_default &&
+ dinfo->type != IF_NONE) {
+ fprintf(stderr, "Warning: Orphaned drive without device: "
+ "id=%s,file=%s,if=%s,bus=%d,unit=%d\n",
+ blk_name(blk), blk_bs(blk)->filename, if_name[dinfo->type],
+ dinfo->bus, dinfo->unit);
+ rs = true;
+ }
+ }
+
+ return rs;
+}
+
+DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
+{
+ return drive_get(type,
+ drive_index_to_bus_id(type, index),
+ drive_index_to_unit_id(type, index));
+}
+
+int drive_get_max_bus(BlockInterfaceType type)
+{
+ int max_bus;
+ BlockBackend *blk;
+ DriveInfo *dinfo;
+
+ max_bus = -1;
+ for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
+ dinfo = blk_legacy_dinfo(blk);
+ if (dinfo && dinfo->type == type && dinfo->bus > max_bus) {
+ max_bus = dinfo->bus;
+ }
+ }
+ return max_bus;
+}
+
+/* Get a block device. This should only be used for single-drive devices
+ (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
+ appropriate bus. */
+DriveInfo *drive_get_next(BlockInterfaceType type)
+{
+ static int next_block_unit[IF_COUNT];
+
+ return drive_get(type, 0, next_block_unit[type]++);
+}
+
+static void bdrv_format_print(void *opaque, const char *name)
+{
+ error_printf(" %s", name);
+}
+
+typedef struct {
+ QEMUBH *bh;
+ BlockDriverState *bs;
+} BDRVPutRefBH;
+
+static void bdrv_put_ref_bh(void *opaque)
+{
+ BDRVPutRefBH *s = opaque;
+
+ bdrv_unref(s->bs);
+ qemu_bh_delete(s->bh);
+ g_free(s);
+}
+
+/*
+ * Release a BDS reference in a BH
+ *
+ * It is not safe to use bdrv_unref() from a callback function when the callers
+ * still need the BlockDriverState. In such cases we schedule a BH to release
+ * the reference.
+ */
+static void bdrv_put_ref_bh_schedule(BlockDriverState *bs)
+{
+ BDRVPutRefBH *s;
+
+ s = g_new(BDRVPutRefBH, 1);
+ s->bh = qemu_bh_new(bdrv_put_ref_bh, s);
+ s->bs = bs;
+ qemu_bh_schedule(s->bh);
+}
+
+static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
+{
+ if (!strcmp(buf, "ignore")) {
+ return BLOCKDEV_ON_ERROR_IGNORE;
+ } else if (!is_read && !strcmp(buf, "enospc")) {
+ return BLOCKDEV_ON_ERROR_ENOSPC;
+ } else if (!strcmp(buf, "stop")) {
+ return BLOCKDEV_ON_ERROR_STOP;
+ } else if (!strcmp(buf, "report")) {
+ return BLOCKDEV_ON_ERROR_REPORT;
+ } else {
+ error_setg(errp, "'%s' invalid %s error action",
+ buf, is_read ? "read" : "write");
+ return -1;
+ }
+}
+
+static bool check_throttle_config(ThrottleConfig *cfg, Error **errp)
+{
+ if (throttle_conflicting(cfg)) {
+ error_setg(errp, "bps/iops/max total values and read/write values"
+ " cannot be used at the same time");
+ return false;
+ }
+
+ if (!throttle_is_valid(cfg)) {
+ error_setg(errp, "bps/iops/maxs values must be 0 or greater");
+ return false;
+ }
+
+ return true;
+}
+
+typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
+
+/* Takes the ownership of bs_opts */
+static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
+ Error **errp)
+{
+ const char *buf;
+ int ro = 0;
+ int bdrv_flags = 0;
+ int on_read_error, on_write_error;
+ BlockBackend *blk;
+ BlockDriverState *bs;
+ ThrottleConfig cfg;
+ int snapshot = 0;
+ bool copy_on_read;
+ Error *error = NULL;
+ QemuOpts *opts;
+ const char *id;
+ bool has_driver_specific_opts;
+ BlockdevDetectZeroesOptions detect_zeroes;
+ const char *throttling_group;
+
+ /* Check common options by copying from bs_opts to opts, all other options
+ * stay in bs_opts for processing by bdrv_open(). */
+ id = qdict_get_try_str(bs_opts, "id");
+ opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
+ if (error) {
+ error_propagate(errp, error);
+ goto err_no_opts;
+ }
+
+ qemu_opts_absorb_qdict(opts, bs_opts, &error);
+ if (error) {
+ error_propagate(errp, error);
+ goto early_err;
+ }
+
+ if (id) {
+ qdict_del(bs_opts, "id");
+ }
+
+ has_driver_specific_opts = !!qdict_size(bs_opts);
+
+ /* extract parameters */
+ snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
+ ro = qemu_opt_get_bool(opts, "read-only", 0);
+ copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false);
+
+ if ((buf = qemu_opt_get(opts, "discard")) != NULL) {
+ if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) {
+ error_setg(errp, "invalid discard option");
+ goto early_err;
+ }
+ }
+
+ if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true)) {
+ bdrv_flags |= BDRV_O_CACHE_WB;
+ }
+ if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_DIRECT, false)) {
+ bdrv_flags |= BDRV_O_NOCACHE;
+ }
+ if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_NO_FLUSH, false)) {
+ bdrv_flags |= BDRV_O_NO_FLUSH;
+ }
+
+#ifdef CONFIG_LINUX_AIO
+ if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
+ if (!strcmp(buf, "native")) {
+ bdrv_flags |= BDRV_O_NATIVE_AIO;
+ } else if (!strcmp(buf, "threads")) {
+ /* this is the default */
+ } else {
+ error_setg(errp, "invalid aio option");
+ goto early_err;
+ }
+ }
+#endif
+
+ if ((buf = qemu_opt_get(opts, "format")) != NULL) {
+ if (is_help_option(buf)) {
+ error_printf("Supported formats:");
+ bdrv_iterate_format(bdrv_format_print, NULL);
+ error_printf("\n");
+ goto early_err;
+ }
+
+ if (qdict_haskey(bs_opts, "driver")) {
+ error_setg(errp, "Cannot specify both 'driver' and 'format'");
+ goto early_err;
+ }
+ qdict_put(bs_opts, "driver", qstring_from_str(buf));
+ }
+
+ /* disk I/O throttling */
+ memset(&cfg, 0, sizeof(cfg));
+ cfg.buckets[THROTTLE_BPS_TOTAL].avg =
+ qemu_opt_get_number(opts, "throttling.bps-total", 0);
+ cfg.buckets[THROTTLE_BPS_READ].avg =
+ qemu_opt_get_number(opts, "throttling.bps-read", 0);
+ cfg.buckets[THROTTLE_BPS_WRITE].avg =
+ qemu_opt_get_number(opts, "throttling.bps-write", 0);
+ cfg.buckets[THROTTLE_OPS_TOTAL].avg =
+ qemu_opt_get_number(opts, "throttling.iops-total", 0);
+ cfg.buckets[THROTTLE_OPS_READ].avg =
+ qemu_opt_get_number(opts, "throttling.iops-read", 0);
+ cfg.buckets[THROTTLE_OPS_WRITE].avg =
+ qemu_opt_get_number(opts, "throttling.iops-write", 0);
+
+ cfg.buckets[THROTTLE_BPS_TOTAL].max =
+ qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
+ cfg.buckets[THROTTLE_BPS_READ].max =
+ qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
+ cfg.buckets[THROTTLE_BPS_WRITE].max =
+ qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
+ cfg.buckets[THROTTLE_OPS_TOTAL].max =
+ qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
+ cfg.buckets[THROTTLE_OPS_READ].max =
+ qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
+ cfg.buckets[THROTTLE_OPS_WRITE].max =
+ qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
+
+ cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0);
+
+ throttling_group = qemu_opt_get(opts, "throttling.group");
+
+ if (!check_throttle_config(&cfg, &error)) {
+ error_propagate(errp, error);
+ goto early_err;
+ }
+
+ on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
+ if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
+ on_write_error = parse_block_error_action(buf, 0, &error);
+ if (error) {
+ error_propagate(errp, error);
+ goto early_err;
+ }
+ }
+
+ on_read_error = BLOCKDEV_ON_ERROR_REPORT;
+ if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
+ on_read_error = parse_block_error_action(buf, 1, &error);
+ if (error) {
+ error_propagate(errp, error);
+ goto early_err;
+ }
+ }
+
+ detect_zeroes =
+ qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
+ qemu_opt_get(opts, "detect-zeroes"),
+ BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX,
+ BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
+ &error);
+ if (error) {
+ error_propagate(errp, error);
+ goto early_err;
+ }
+
+ if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
+ !(bdrv_flags & BDRV_O_UNMAP)) {
+ error_setg(errp, "setting detect-zeroes to unmap is not allowed "
+ "without setting discard operation to unmap");
+ goto early_err;
+ }
+
+ /* init */
+ if ((!file || !*file) && !has_driver_specific_opts) {
+ blk = blk_new_with_bs(qemu_opts_id(opts), errp);
+ if (!blk) {
+ goto early_err;
+ }
+
+ bs = blk_bs(blk);
+ bs->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0;
+ bs->read_only = ro;
+
+ QDECREF(bs_opts);
+ } else {
+ if (file && !*file) {
+ file = NULL;
+ }
+
+ if (snapshot) {
+ /* always use cache=unsafe with snapshot */
+ bdrv_flags &= ~BDRV_O_CACHE_MASK;
+ bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
+ }
+
+ if (copy_on_read) {
+ bdrv_flags |= BDRV_O_COPY_ON_READ;
+ }
+
+ if (runstate_check(RUN_STATE_INMIGRATE)) {
+ bdrv_flags |= BDRV_O_INCOMING;
+ }
+
+ bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
+
+ blk = blk_new_open(qemu_opts_id(opts), file, NULL, bs_opts, bdrv_flags,
+ errp);
+ if (!blk) {
+ goto err_no_bs_opts;
+ }
+ bs = blk_bs(blk);
+ }
+
+ bs->detect_zeroes = detect_zeroes;
+
+ bdrv_set_on_error(bs, on_read_error, on_write_error);
+
+ /* disk I/O throttling */
+ if (throttle_enabled(&cfg)) {
+ if (!throttling_group) {
+ throttling_group = blk_name(blk);
+ }
+ bdrv_io_limits_enable(bs, throttling_group);
+ bdrv_set_io_limits(bs, &cfg);
+ }
+
+ if (bdrv_key_required(bs)) {
+ autostart = 0;
+ }
+
+err_no_bs_opts:
+ qemu_opts_del(opts);
+ return blk;
+
+early_err:
+ qemu_opts_del(opts);
+err_no_opts:
+ QDECREF(bs_opts);
+ return NULL;
+}
+
+static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
+ Error **errp)
+{
+ const char *value;
+
+ value = qemu_opt_get(opts, from);
+ if (value) {
+ if (qemu_opt_find(opts, to)) {
+ error_setg(errp, "'%s' and its alias '%s' can't be used at the "
+ "same time", to, from);
+ return;
+ }
+ }
+
+ /* rename all items in opts */
+ while ((value = qemu_opt_get(opts, from))) {
+ qemu_opt_set(opts, to, value, &error_abort);
+ qemu_opt_unset(opts, from);
+ }
+}
+
+QemuOptsList qemu_legacy_drive_opts = {
+ .name = "drive",
+ .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
+ .desc = {
+ {
+ .name = "bus",
+ .type = QEMU_OPT_NUMBER,
+ .help = "bus number",
+ },{
+ .name = "unit",
+ .type = QEMU_OPT_NUMBER,
+ .help = "unit number (i.e. lun for scsi)",
+ },{
+ .name = "index",
+ .type = QEMU_OPT_NUMBER,
+ .help = "index number",
+ },{
+ .name = "media",
+ .type = QEMU_OPT_STRING,
+ .help = "media type (disk, cdrom)",
+ },{
+ .name = "if",
+ .type = QEMU_OPT_STRING,
+ .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
+ },{
+ .name = "cyls",
+ .type = QEMU_OPT_NUMBER,
+ .help = "number of cylinders (ide disk geometry)",
+ },{
+ .name = "heads",
+ .type = QEMU_OPT_NUMBER,
+ .help = "number of heads (ide disk geometry)",
+ },{
+ .name = "secs",
+ .type = QEMU_OPT_NUMBER,
+ .help = "number of sectors (ide disk geometry)",
+ },{
+ .name = "trans",
+ .type = QEMU_OPT_STRING,
+ .help = "chs translation (auto, lba, none)",
+ },{
+ .name = "boot",
+ .type = QEMU_OPT_BOOL,
+ .help = "(deprecated, ignored)",
+ },{
+ .name = "addr",
+ .type = QEMU_OPT_STRING,
+ .help = "pci address (virtio only)",
+ },{
+ .name = "serial",
+ .type = QEMU_OPT_STRING,
+ .help = "disk serial number",
+ },{
+ .name = "file",
+ .type = QEMU_OPT_STRING,
+ .help = "file name",
+ },
+
+ /* Options that are passed on, but have special semantics with -drive */
+ {
+ .name = "read-only",
+ .type = QEMU_OPT_BOOL,
+ .help = "open drive file as read-only",
+ },{
+ .name = "rerror",
+ .type = QEMU_OPT_STRING,
+ .help = "read error action",
+ },{
+ .name = "werror",
+ .type = QEMU_OPT_STRING,
+ .help = "write error action",
+ },{
+ .name = "copy-on-read",
+ .type = QEMU_OPT_BOOL,
+ .help = "copy read data from backing file into image file",
+ },
+
+ { /* end of list */ }
+ },
+};
+
+DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type)
+{
+ const char *value;
+ BlockBackend *blk;
+ DriveInfo *dinfo = NULL;
+ QDict *bs_opts;
+ QemuOpts *legacy_opts;
+ DriveMediaType media = MEDIA_DISK;
+ BlockInterfaceType type;
+ int cyls, heads, secs, translation;
+ int max_devs, bus_id, unit_id, index;
+ const char *devaddr;
+ const char *werror, *rerror;
+ bool read_only = false;
+ bool copy_on_read;
+ const char *serial;
+ const char *filename;
+ Error *local_err = NULL;
+ int i;
+
+ /* Change legacy command line options into QMP ones */
+ static const struct {
+ const char *from;
+ const char *to;
+ } opt_renames[] = {
+ { "iops", "throttling.iops-total" },
+ { "iops_rd", "throttling.iops-read" },
+ { "iops_wr", "throttling.iops-write" },
+
+ { "bps", "throttling.bps-total" },
+ { "bps_rd", "throttling.bps-read" },
+ { "bps_wr", "throttling.bps-write" },
+
+ { "iops_max", "throttling.iops-total-max" },
+ { "iops_rd_max", "throttling.iops-read-max" },
+ { "iops_wr_max", "throttling.iops-write-max" },
+
+ { "bps_max", "throttling.bps-total-max" },
+ { "bps_rd_max", "throttling.bps-read-max" },
+ { "bps_wr_max", "throttling.bps-write-max" },
+
+ { "iops_size", "throttling.iops-size" },
+
+ { "group", "throttling.group" },
+
+ { "readonly", "read-only" },
+ };
+
+ for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
+ qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to,
+ &local_err);
+ if (local_err) {
+ error_report_err(local_err);
+ return NULL;
+ }
+ }
+
+ value = qemu_opt_get(all_opts, "cache");
+ if (value) {
+ int flags = 0;
+
+ if (bdrv_parse_cache_flags(value, &flags) != 0) {
+ error_report("invalid cache option");
+ return NULL;
+ }
+
+ /* Specific options take precedence */
+ if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) {
+ qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB,
+ !!(flags & BDRV_O_CACHE_WB), &error_abort);
+ }
+ if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) {
+ qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT,
+ !!(flags & BDRV_O_NOCACHE), &error_abort);
+ }
+ if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) {
+ qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH,
+ !!(flags & BDRV_O_NO_FLUSH), &error_abort);
+ }
+ qemu_opt_unset(all_opts, "cache");
+ }
+
+ /* Get a QDict for processing the options */
+ bs_opts = qdict_new();
+ qemu_opts_to_qdict(all_opts, bs_opts);
+
+ legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
+ &error_abort);
+ qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
+ if (local_err) {
+ error_report_err(local_err);
+ goto fail;
+ }
+
+ /* Deprecated option boot=[on|off] */
+ if (qemu_opt_get(legacy_opts, "boot") != NULL) {
+ fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
+ "ignored. Future versions will reject this parameter. Please "
+ "update your scripts.\n");
+ }
+
+ /* Media type */
+ value = qemu_opt_get(legacy_opts, "media");
+ if (value) {
+ if (!strcmp(value, "disk")) {
+ media = MEDIA_DISK;
+ } else if (!strcmp(value, "cdrom")) {
+ media = MEDIA_CDROM;
+ read_only = true;
+ } else {
+ error_report("'%s' invalid media", value);
+ goto fail;
+ }
+ }
+
+ /* copy-on-read is disabled with a warning for read-only devices */
+ read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false);
+ copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
+
+ if (read_only && copy_on_read) {
+ error_report("warning: disabling copy-on-read on read-only drive");
+ copy_on_read = false;
+ }
+
+ qdict_put(bs_opts, "read-only",
+ qstring_from_str(read_only ? "on" : "off"));
+ qdict_put(bs_opts, "copy-on-read",
+ qstring_from_str(copy_on_read ? "on" :"off"));
+
+ /* Controller type */
+ value = qemu_opt_get(legacy_opts, "if");
+ if (value) {
+ for (type = 0;
+ type < IF_COUNT && strcmp(value, if_name[type]);
+ type++) {
+ }
+ if (type == IF_COUNT) {
+ error_report("unsupported bus type '%s'", value);
+ goto fail;
+ }
+ } else {
+ type = block_default_type;
+ }
+
+ /* Geometry */
+ cyls = qemu_opt_get_number(legacy_opts, "cyls", 0);
+ heads = qemu_opt_get_number(legacy_opts, "heads", 0);
+ secs = qemu_opt_get_number(legacy_opts, "secs", 0);
+
+ if (cyls || heads || secs) {
+ if (cyls < 1) {
+ error_report("invalid physical cyls number");
+ goto fail;
+ }
+ if (heads < 1) {
+ error_report("invalid physical heads number");
+ goto fail;
+ }
+ if (secs < 1) {
+ error_report("invalid physical secs number");
+ goto fail;
+ }
+ }
+
+ translation = BIOS_ATA_TRANSLATION_AUTO;
+ value = qemu_opt_get(legacy_opts, "trans");
+ if (value != NULL) {
+ if (!cyls) {
+ error_report("'%s' trans must be used with cyls, heads and secs",
+ value);
+ goto fail;
+ }
+ if (!strcmp(value, "none")) {
+ translation = BIOS_ATA_TRANSLATION_NONE;
+ } else if (!strcmp(value, "lba")) {
+ translation = BIOS_ATA_TRANSLATION_LBA;
+ } else if (!strcmp(value, "large")) {
+ translation = BIOS_ATA_TRANSLATION_LARGE;
+ } else if (!strcmp(value, "rechs")) {
+ translation = BIOS_ATA_TRANSLATION_RECHS;
+ } else if (!strcmp(value, "auto")) {
+ translation = BIOS_ATA_TRANSLATION_AUTO;
+ } else {
+ error_report("'%s' invalid translation type", value);
+ goto fail;
+ }
+ }
+
+ if (media == MEDIA_CDROM) {
+ if (cyls || secs || heads) {
+ error_report("CHS can't be set with media=cdrom");
+ goto fail;
+ }
+ }
+
+ /* Device address specified by bus/unit or index.
+ * If none was specified, try to find the first free one. */
+ bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
+ unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
+ index = qemu_opt_get_number(legacy_opts, "index", -1);
+
+ max_devs = if_max_devs[type];
+
+ if (index != -1) {
+ if (bus_id != 0 || unit_id != -1) {
+ error_report("index cannot be used with bus and unit");
+ goto fail;
+ }
+ bus_id = drive_index_to_bus_id(type, index);
+ unit_id = drive_index_to_unit_id(type, index);
+ }
+
+ if (unit_id == -1) {
+ unit_id = 0;
+ while (drive_get(type, bus_id, unit_id) != NULL) {
+ unit_id++;
+ if (max_devs && unit_id >= max_devs) {
+ unit_id -= max_devs;
+ bus_id++;
+ }
+ }
+ }
+
+ if (max_devs && unit_id >= max_devs) {
+ error_report("unit %d too big (max is %d)", unit_id, max_devs - 1);
+ goto fail;
+ }
+
+ if (drive_get(type, bus_id, unit_id) != NULL) {
+ error_report("drive with bus=%d, unit=%d (index=%d) exists",
+ bus_id, unit_id, index);
+ goto fail;
+ }
+
+ /* Serial number */
+ serial = qemu_opt_get(legacy_opts, "serial");
+
+ /* no id supplied -> create one */
+ if (qemu_opts_id(all_opts) == NULL) {
+ char *new_id;
+ const char *mediastr = "";
+ if (type == IF_IDE || type == IF_SCSI) {
+ mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
+ }
+ if (max_devs) {
+ new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
+ mediastr, unit_id);
+ } else {
+ new_id = g_strdup_printf("%s%s%i", if_name[type],
+ mediastr, unit_id);
+ }
+ qdict_put(bs_opts, "id", qstring_from_str(new_id));
+ g_free(new_id);
+ }
+
+ /* Add virtio block device */
+ devaddr = qemu_opt_get(legacy_opts, "addr");
+ if (devaddr && type != IF_VIRTIO) {
+ error_report("addr is not supported by this bus type");
+ goto fail;
+ }
+
+ if (type == IF_VIRTIO) {
+ QemuOpts *devopts;
+ devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
+ &error_abort);
+ if (arch_type == QEMU_ARCH_S390X) {
+ qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort);
+ } else {
+ qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort);
+ }
+ qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
+ &error_abort);
+ if (devaddr) {
+ qemu_opt_set(devopts, "addr", devaddr, &error_abort);
+ }
+ }
+
+ filename = qemu_opt_get(legacy_opts, "file");
+
+ /* Check werror/rerror compatibility with if=... */
+ werror = qemu_opt_get(legacy_opts, "werror");
+ if (werror != NULL) {
+ if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
+ type != IF_NONE) {
+ error_report("werror is not supported by this bus type");
+ goto fail;
+ }
+ qdict_put(bs_opts, "werror", qstring_from_str(werror));
+ }
+
+ rerror = qemu_opt_get(legacy_opts, "rerror");
+ if (rerror != NULL) {
+ if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI &&
+ type != IF_NONE) {
+ error_report("rerror is not supported by this bus type");
+ goto fail;
+ }
+ qdict_put(bs_opts, "rerror", qstring_from_str(rerror));
+ }
+
+ /* Actual block device init: Functionality shared with blockdev-add */
+ blk = blockdev_init(filename, bs_opts, &local_err);
+ bs_opts = NULL;
+ if (!blk) {
+ if (local_err) {
+ error_report_err(local_err);
+ }
+ goto fail;
+ } else {
+ assert(!local_err);
+ }
+
+ /* Create legacy DriveInfo */
+ dinfo = g_malloc0(sizeof(*dinfo));
+ dinfo->opts = all_opts;
+
+ dinfo->cyls = cyls;
+ dinfo->heads = heads;
+ dinfo->secs = secs;
+ dinfo->trans = translation;
+
+ dinfo->type = type;
+ dinfo->bus = bus_id;
+ dinfo->unit = unit_id;
+ dinfo->devaddr = devaddr;
+ dinfo->serial = g_strdup(serial);
+
+ blk_set_legacy_dinfo(blk, dinfo);
+
+ switch(type) {
+ case IF_IDE:
+ case IF_SCSI:
+ case IF_XEN:
+ case IF_NONE:
+ dinfo->media_cd = media == MEDIA_CDROM;
+ break;
+ default:
+ break;
+ }
+
+fail:
+ qemu_opts_del(legacy_opts);
+ QDECREF(bs_opts);
+ return dinfo;
+}
+
+void hmp_commit(Monitor *mon, const QDict *qdict)
+{
+ const char *device = qdict_get_str(qdict, "device");
+ BlockBackend *blk;
+ int ret;
+
+ if (!strcmp(device, "all")) {
+ ret = bdrv_commit_all();
+ } else {
+ blk = blk_by_name(device);
+ if (!blk) {
+ monitor_printf(mon, "Device '%s' not found\n", device);
+ return;
+ }
+ ret = bdrv_commit(blk_bs(blk));
+ }
+ if (ret < 0) {
+ monitor_printf(mon, "'commit' error for '%s': %s\n", device,
+ strerror(-ret));
+ }
+}
+
+static void blockdev_do_action(int kind, void *data, Error **errp)
+{
+ TransactionAction action;
+ TransactionActionList list;
+
+ action.kind = kind;
+ action.data = data;
+ list.value = &action;
+ list.next = NULL;
+ qmp_transaction(&list, errp);
+}
+
+void qmp_blockdev_snapshot_sync(bool has_device, const char *device,
+ bool has_node_name, const char *node_name,
+ const char *snapshot_file,
+ bool has_snapshot_node_name,
+ const char *snapshot_node_name,
+ bool has_format, const char *format,
+ bool has_mode, NewImageMode mode, Error **errp)
+{
+ BlockdevSnapshot snapshot = {
+ .has_device = has_device,
+ .device = (char *) device,
+ .has_node_name = has_node_name,
+ .node_name = (char *) node_name,
+ .snapshot_file = (char *) snapshot_file,
+ .has_snapshot_node_name = has_snapshot_node_name,
+ .snapshot_node_name = (char *) snapshot_node_name,
+ .has_format = has_format,
+ .format = (char *) format,
+ .has_mode = has_mode,
+ .mode = mode,
+ };
+ blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
+ &snapshot, errp);
+}
+
+void qmp_blockdev_snapshot_internal_sync(const char *device,
+ const char *name,
+ Error **errp)
+{
+ BlockdevSnapshotInternal snapshot = {
+ .device = (char *) device,
+ .name = (char *) name
+ };
+
+ blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
+ &snapshot, errp);
+}
+
+SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
+ bool has_id,
+ const char *id,
+ bool has_name,
+ const char *name,
+ Error **errp)
+{
+ BlockDriverState *bs;
+ BlockBackend *blk;
+ AioContext *aio_context;
+ QEMUSnapshotInfo sn;
+ Error *local_err = NULL;
+ SnapshotInfo *info = NULL;
+ int ret;
+
+ blk = blk_by_name(device);
+ if (!blk) {
+ error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
+ "Device '%s' not found", device);
+ return NULL;
+ }
+ bs = blk_bs(blk);
+
+ if (!has_id) {
+ id = NULL;
+ }
+
+ if (!has_name) {
+ name = NULL;
+ }
+
+ if (!id && !name) {
+ error_setg(errp, "Name or id must be provided");
+ return NULL;
+ }
+
+ aio_context = bdrv_get_aio_context(bs);
+ aio_context_acquire(aio_context);
+
+ if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
+ goto out_aio_context;
+ }
+
+ ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ goto out_aio_context;
+ }
+ if (!ret) {
+ error_setg(errp,
+ "Snapshot with id '%s' and name '%s' does not exist on "
+ "device '%s'",
+ STR_OR_NULL(id), STR_OR_NULL(name), device);
+ goto out_aio_context;
+ }
+
+ bdrv_snapshot_delete(bs, id, name, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ goto out_aio_context;
+ }
+
+ aio_context_release(aio_context);
+
+ info = g_new0(SnapshotInfo, 1);
+ info->id = g_strdup(sn.id_str);
+ info->name = g_strdup(sn.name);
+ info->date_nsec = sn.date_nsec;
+ info->date_sec = sn.date_sec;
+ info->vm_state_size = sn.vm_state_size;
+ info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
+ info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
+
+ return info;
+
+out_aio_context:
+ aio_context_release(aio_context);
+ return NULL;
+}
+
+/**
+ * block_dirty_bitmap_lookup:
+ * Return a dirty bitmap (if present), after validating
+ * the node reference and bitmap names.
+ *
+ * @node: The name of the BDS node to search for bitmaps
+ * @name: The name of the bitmap to search for
+ * @pbs: Output pointer for BDS lookup, if desired. Can be NULL.
+ * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL.
+ * @errp: Output pointer for error information. Can be NULL.
+ *
+ * @return: A bitmap object on success, or NULL on failure.
+ */
+static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node,
+ const char *name,
+ BlockDriverState **pbs,
+ AioContext **paio,
+ Error **errp)
+{
+ BlockDriverState *bs;
+ BdrvDirtyBitmap *bitmap;
+ AioContext *aio_context;
+
+ if (!node) {
+ error_setg(errp, "Node cannot be NULL");
+ return NULL;
+ }
+ if (!name) {
+ error_setg(errp, "Bitmap name cannot be NULL");
+ return NULL;
+ }
+ bs = bdrv_lookup_bs(node, node, NULL);
+ if (!bs) {
+ error_setg(errp, "Node '%s' not found", node);
+ return NULL;
+ }
+
+ aio_context = bdrv_get_aio_context(bs);
+ aio_context_acquire(aio_context);
+
+ bitmap = bdrv_find_dirty_bitmap(bs, name);
+ if (!bitmap) {
+ error_setg(errp, "Dirty bitmap '%s' not found", name);
+ goto fail;
+ }
+
+ if (pbs) {
+ *pbs = bs;
+ }
+ if (paio) {
+ *paio = aio_context;
+ } else {
+ aio_context_release(aio_context);
+ }
+
+ return bitmap;
+
+ fail:
+ aio_context_release(aio_context);
+ return NULL;
+}
+
+/* New and old BlockDriverState structs for atomic group operations */
+
+typedef struct BlkTransactionState BlkTransactionState;
+
+/* Only prepare() may fail. In a single transaction, only one of commit() or
+ abort() will be called, clean() will always be called if it present. */
+typedef struct BdrvActionOps {
+ /* Size of state struct, in bytes. */
+ size_t instance_size;
+ /* Prepare the work, must NOT be NULL. */
+ void (*prepare)(BlkTransactionState *common, Error **errp);
+ /* Commit the changes, can be NULL. */
+ void (*commit)(BlkTransactionState *common);
+ /* Abort the changes on fail, can be NULL. */
+ void (*abort)(BlkTransactionState *common);
+ /* Clean up resource in the end, can be NULL. */
+ void (*clean)(BlkTransactionState *common);
+} BdrvActionOps;
+
+/*
+ * This structure must be arranged as first member in child type, assuming
+ * that compiler will also arrange it to the same address with parent instance.
+ * Later it will be used in free().
+ */
+struct BlkTransactionState {
+ TransactionAction *action;
+ const BdrvActionOps *ops;
+ QSIMPLEQ_ENTRY(BlkTransactionState) entry;
+};
+
+/* internal snapshot private data */
+typedef struct InternalSnapshotState {
+ BlkTransactionState common;
+ BlockDriverState *bs;
+ AioContext *aio_context;
+ QEMUSnapshotInfo sn;
+} InternalSnapshotState;
+
+static void internal_snapshot_prepare(BlkTransactionState *common,
+ Error **errp)
+{
+ Error *local_err = NULL;
+ const char *device;
+ const char *name;
+ BlockBackend *blk;
+ BlockDriverState *bs;
+ QEMUSnapshotInfo old_sn, *sn;
+ bool ret;
+ qemu_timeval tv;
+ BlockdevSnapshotInternal *internal;
+ InternalSnapshotState *state;
+ int ret1;
+
+ g_assert(common->action->kind ==
+ TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
+ internal = common->action->blockdev_snapshot_internal_sync;
+ state = DO_UPCAST(InternalSnapshotState, common, common);
+
+ /* 1. parse input */
+ device = internal->device;
+ name = internal->name;
+
+ /* 2. check for validation */
+ blk = blk_by_name(device);
+ if (!blk) {
+ error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
+ "Device '%s' not found", device);
+ return;
+ }
+ bs = blk_bs(blk);
+
+ /* AioContext is released in .clean() */
+ state->aio_context = bdrv_get_aio_context(bs);
+ aio_context_acquire(state->aio_context);
+
+ if (!bdrv_is_inserted(bs)) {
+ error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
+ return;
+ }
+
+ if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
+ return;
+ }
+
+ if (bdrv_is_read_only(bs)) {
+ error_setg(errp, "Device '%s' is read only", device);
+ return;
+ }
+
+ if (!bdrv_can_snapshot(bs)) {
+ error_setg(errp, "Block format '%s' used by device '%s' "
+ "does not support internal snapshots",
+ bs->drv->format_name, device);
+ return;
+ }
+
+ if (!strlen(name)) {
+ error_setg(errp, "Name is empty");
+ return;
+ }
+
+ /* check whether a snapshot with name exist */
+ ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
+ &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ return;
+ } else if (ret) {
+ error_setg(errp,
+ "Snapshot with name '%s' already exists on device '%s'",
+ name, device);
+ return;
+ }
+
+ /* 3. take the snapshot */
+ sn = &state->sn;
+ pstrcpy(sn->name, sizeof(sn->name), name);
+ qemu_gettimeofday(&tv);
+ sn->date_sec = tv.tv_sec;
+ sn->date_nsec = tv.tv_usec * 1000;
+ sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
+
+ ret1 = bdrv_snapshot_create(bs, sn);
+ if (ret1 < 0) {
+ error_setg_errno(errp, -ret1,
+ "Failed to create snapshot '%s' on device '%s'",
+ name, device);
+ return;
+ }
+
+ /* 4. succeed, mark a snapshot is created */
+ state->bs = bs;
+}
+
+static void internal_snapshot_abort(BlkTransactionState *common)
+{
+ InternalSnapshotState *state =
+ DO_UPCAST(InternalSnapshotState, common, common);
+ BlockDriverState *bs = state->bs;
+ QEMUSnapshotInfo *sn = &state->sn;
+ Error *local_error = NULL;
+
+ if (!bs) {
+ return;
+ }
+
+ if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
+ error_report("Failed to delete snapshot with id '%s' and name '%s' on "
+ "device '%s' in abort: %s",
+ sn->id_str,
+ sn->name,
+ bdrv_get_device_name(bs),
+ error_get_pretty(local_error));
+ error_free(local_error);
+ }
+}
+
+static void internal_snapshot_clean(BlkTransactionState *common)
+{
+ InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
+ common, common);
+
+ if (state->aio_context) {
+ aio_context_release(state->aio_context);
+ }
+}
+
+/* external snapshot private data */
+typedef struct ExternalSnapshotState {
+ BlkTransactionState common;
+ BlockDriverState *old_bs;
+ BlockDriverState *new_bs;
+ AioContext *aio_context;
+} ExternalSnapshotState;
+
+static void external_snapshot_prepare(BlkTransactionState *common,
+ Error **errp)
+{
+ BlockDriver *drv;
+ int flags, ret;
+ QDict *options = NULL;
+ Error *local_err = NULL;
+ bool has_device = false;
+ const char *device;
+ bool has_node_name = false;
+ const char *node_name;
+ bool has_snapshot_node_name = false;
+ const char *snapshot_node_name;
+ const char *new_image_file;
+ const char *format = "qcow2";
+ enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
+ ExternalSnapshotState *state =
+ DO_UPCAST(ExternalSnapshotState, common, common);
+ TransactionAction *action = common->action;
+
+ /* get parameters */
+ g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC);
+
+ has_device = action->blockdev_snapshot_sync->has_device;
+ device = action->blockdev_snapshot_sync->device;
+ has_node_name = action->blockdev_snapshot_sync->has_node_name;
+ node_name = action->blockdev_snapshot_sync->node_name;
+ has_snapshot_node_name =
+ action->blockdev_snapshot_sync->has_snapshot_node_name;
+ snapshot_node_name = action->blockdev_snapshot_sync->snapshot_node_name;
+
+ new_image_file = action->blockdev_snapshot_sync->snapshot_file;
+ if (action->blockdev_snapshot_sync->has_format) {
+ format = action->blockdev_snapshot_sync->format;
+ }
+ if (action->blockdev_snapshot_sync->has_mode) {
+ mode = action->blockdev_snapshot_sync->mode;
+ }
+
+ /* start processing */
+ drv = bdrv_find_format(format);
+ if (!drv) {
+ error_setg(errp, QERR_INVALID_BLOCK_FORMAT, format);
+ return;
+ }
+
+ state->old_bs = bdrv_lookup_bs(has_device ? device : NULL,
+ has_node_name ? node_name : NULL,
+ &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ return;
+ }
+
+ if (has_node_name && !has_snapshot_node_name) {
+ error_setg(errp, "New snapshot node name missing");
+ return;
+ }
+
+ if (has_snapshot_node_name && bdrv_find_node(snapshot_node_name)) {
+ error_setg(errp, "New snapshot node name already existing");
+ return;
+ }
+
+ /* Acquire AioContext now so any threads operating on old_bs stop */
+ state->aio_context = bdrv_get_aio_context(state->old_bs);
+ aio_context_acquire(state->aio_context);
+
+ if (!bdrv_is_inserted(state->old_bs)) {
+ error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
+ return;
+ }
+
+ if (bdrv_op_is_blocked(state->old_bs,
+ BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
+ return;
+ }
+
+ if (!bdrv_is_read_only(state->old_bs)) {
+ if (bdrv_flush(state->old_bs)) {
+ error_setg(errp, QERR_IO_ERROR);
+ return;
+ }
+ }
+
+ if (!bdrv_is_first_non_filter(state->old_bs)) {
+ error_setg(errp, QERR_FEATURE_DISABLED, "snapshot");
+ return;
+ }
+
+ flags = state->old_bs->open_flags;
+
+ /* create new image w/backing file */
+ if (mode != NEW_IMAGE_MODE_EXISTING) {
+ bdrv_img_create(new_image_file, format,
+ state->old_bs->filename,
+ state->old_bs->drv->format_name,
+ NULL, -1, flags, &local_err, false);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ return;
+ }
+ }
+
+ if (has_snapshot_node_name) {
+ options = qdict_new();
+ qdict_put(options, "node-name",
+ qstring_from_str(snapshot_node_name));
+ }
+
+ /* TODO Inherit bs->options or only take explicit options with an
+ * extended QMP command? */
+ assert(state->new_bs == NULL);
+ ret = bdrv_open(&state->new_bs, new_image_file, NULL, options,
+ flags | BDRV_O_NO_BACKING, drv, &local_err);
+ /* We will manually add the backing_hd field to the bs later */
+ if (ret != 0) {
+ error_propagate(errp, local_err);
+ }
+}
+
+static void external_snapshot_commit(BlkTransactionState *common)
+{
+ ExternalSnapshotState *state =
+ DO_UPCAST(ExternalSnapshotState, common, common);
+
+ bdrv_set_aio_context(state->new_bs, state->aio_context);
+
+ /* This removes our old bs and adds the new bs */
+ bdrv_append(state->new_bs, state->old_bs);
+ /* We don't need (or want) to use the transactional
+ * bdrv_reopen_multiple() across all the entries at once, because we
+ * don't want to abort all of them if one of them fails the reopen */
+ bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR,
+ NULL);
+
+ aio_context_release(state->aio_context);
+}
+
+static void external_snapshot_abort(BlkTransactionState *common)
+{
+ ExternalSnapshotState *state =
+ DO_UPCAST(ExternalSnapshotState, common, common);
+ if (state->new_bs) {
+ bdrv_unref(state->new_bs);
+ }
+ if (state->aio_context) {
+ aio_context_release(state->aio_context);
+ }
+}
+
+typedef struct DriveBackupState {
+ BlkTransactionState common;
+ BlockDriverState *bs;
+ AioContext *aio_context;
+ BlockJob *job;
+} DriveBackupState;
+
+static void drive_backup_prepare(BlkTransactionState *common, Error **errp)
+{
+ DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
+ BlockDriverState *bs;
+ BlockBackend *blk;
+ DriveBackup *backup;
+ Error *local_err = NULL;
+
+ assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
+ backup = common->action->drive_backup;
+
+ blk = blk_by_name(backup->device);
+ if (!blk) {
+ error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
+ "Device '%s' not found", backup->device);
+ return;
+ }
+ bs = blk_bs(blk);
+
+ /* AioContext is released in .clean() */
+ state->aio_context = bdrv_get_aio_context(bs);
+ aio_context_acquire(state->aio_context);
+
+ qmp_drive_backup(backup->device, backup->target,
+ backup->has_format, backup->format,
+ backup->sync,
+ backup->has_mode, backup->mode,
+ backup->has_speed, backup->speed,
+ backup->has_bitmap, backup->bitmap,
+ backup->has_on_source_error, backup->on_source_error,
+ backup->has_on_target_error, backup->on_target_error,
+ &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ return;
+ }
+
+ state->bs = bs;
+ state->job = state->bs->job;
+}
+
+static void drive_backup_abort(BlkTransactionState *common)
+{
+ DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
+ BlockDriverState *bs = state->bs;
+
+ /* Only cancel if it's the job we started */
+ if (bs && bs->job && bs->job == state->job) {
+ block_job_cancel_sync(bs->job);
+ }
+}
+
+static void drive_backup_clean(BlkTransactionState *common)
+{
+ DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
+
+ if (state->aio_context) {
+ aio_context_release(state->aio_context);
+ }
+}
+
+typedef struct BlockdevBackupState {
+ BlkTransactionState common;
+ BlockDriverState *bs;
+ BlockJob *job;
+ AioContext *aio_context;
+} BlockdevBackupState;
+
+static void blockdev_backup_prepare(BlkTransactionState *common, Error **errp)
+{
+ BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
+ BlockdevBackup *backup;
+ BlockDriverState *bs, *target;
+ BlockBackend *blk;
+ Error *local_err = NULL;
+
+ assert(common->action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
+ backup = common->action->blockdev_backup;
+
+ blk = blk_by_name(backup->device);
+ if (!blk) {
+ error_setg(errp, "Device '%s' not found", backup->device);
+ return;
+ }
+ bs = blk_bs(blk);
+
+ blk = blk_by_name(backup->target);
+ if (!blk) {
+ error_setg(errp, "Device '%s' not found", backup->target);
+ return;
+ }
+ target = blk_bs(blk);
+
+ /* AioContext is released in .clean() */
+ state->aio_context = bdrv_get_aio_context(bs);
+ if (state->aio_context != bdrv_get_aio_context(target)) {
+ state->aio_context = NULL;
+ error_setg(errp, "Backup between two IO threads is not implemented");
+ return;
+ }
+ aio_context_acquire(state->aio_context);
+
+ qmp_blockdev_backup(backup->device, backup->target,
+ backup->sync,
+ backup->has_speed, backup->speed,
+ backup->has_on_source_error, backup->on_source_error,
+ backup->has_on_target_error, backup->on_target_error,
+ &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ return;
+ }
+
+ state->bs = bs;
+ state->job = state->bs->job;
+}
+
+static void blockdev_backup_abort(BlkTransactionState *common)
+{
+ BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
+ BlockDriverState *bs = state->bs;
+
+ /* Only cancel if it's the job we started */
+ if (bs && bs->job && bs->job == state->job) {
+ block_job_cancel_sync(bs->job);
+ }
+}
+
+static void blockdev_backup_clean(BlkTransactionState *common)
+{
+ BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
+
+ if (state->aio_context) {
+ aio_context_release(state->aio_context);
+ }
+}
+
+static void abort_prepare(BlkTransactionState *common, Error **errp)
+{
+ error_setg(errp, "Transaction aborted using Abort action");
+}
+
+static void abort_commit(BlkTransactionState *common)
+{
+ g_assert_not_reached(); /* this action never succeeds */
+}
+
+static const BdrvActionOps actions[] = {
+ [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
+ .instance_size = sizeof(ExternalSnapshotState),
+ .prepare = external_snapshot_prepare,
+ .commit = external_snapshot_commit,
+ .abort = external_snapshot_abort,
+ },
+ [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
+ .instance_size = sizeof(DriveBackupState),
+ .prepare = drive_backup_prepare,
+ .abort = drive_backup_abort,
+ .clean = drive_backup_clean,
+ },
+ [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
+ .instance_size = sizeof(BlockdevBackupState),
+ .prepare = blockdev_backup_prepare,
+ .abort = blockdev_backup_abort,
+ .clean = blockdev_backup_clean,
+ },
+ [TRANSACTION_ACTION_KIND_ABORT] = {
+ .instance_size = sizeof(BlkTransactionState),
+ .prepare = abort_prepare,
+ .commit = abort_commit,
+ },
+ [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
+ .instance_size = sizeof(InternalSnapshotState),
+ .prepare = internal_snapshot_prepare,
+ .abort = internal_snapshot_abort,
+ .clean = internal_snapshot_clean,
+ },
+};
+
+/*
+ * 'Atomic' group operations. The operations are performed as a set, and if
+ * any fail then we roll back all operations in the group.
+ */
+void qmp_transaction(TransactionActionList *dev_list, Error **errp)
+{
+ TransactionActionList *dev_entry = dev_list;
+ BlkTransactionState *state, *next;
+ Error *local_err = NULL;
+
+ QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states;
+ QSIMPLEQ_INIT(&snap_bdrv_states);
+
+ /* drain all i/o before any operations */
+ bdrv_drain_all();
+
+ /* We don't do anything in this loop that commits us to the operations */
+ while (NULL != dev_entry) {
+ TransactionAction *dev_info = NULL;
+ const BdrvActionOps *ops;
+
+ dev_info = dev_entry->value;
+ dev_entry = dev_entry->next;
+
+ assert(dev_info->kind < ARRAY_SIZE(actions));
+
+ ops = &actions[dev_info->kind];
+ assert(ops->instance_size > 0);
+
+ state = g_malloc0(ops->instance_size);
+ state->ops = ops;
+ state->action = dev_info;
+ QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
+
+ state->ops->prepare(state, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ goto delete_and_fail;
+ }
+ }
+
+ QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
+ if (state->ops->commit) {
+ state->ops->commit(state);
+ }
+ }
+
+ /* success */
+ goto exit;
+
+delete_and_fail:
+ /* failure, and it is all-or-none; roll back all operations */
+ QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
+ if (state->ops->abort) {
+ state->ops->abort(state);
+ }
+ }
+exit:
+ QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
+ if (state->ops->clean) {
+ state->ops->clean(state);
+ }
+ g_free(state);
+ }
+}
+
+
+static void eject_device(BlockBackend *blk, int force, Error **errp)
+{
+ BlockDriverState *bs = blk_bs(blk);
+ AioContext *aio_context;
+
+ aio_context = bdrv_get_aio_context(bs);
+ aio_context_acquire(aio_context);
+
+ if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
+ goto out;
+ }
+ if (!blk_dev_has_removable_media(blk)) {
+ error_setg(errp, "Device '%s' is not removable",
+ bdrv_get_device_name(bs));
+ goto out;
+ }
+
+ if (blk_dev_is_medium_locked(blk) && !blk_dev_is_tray_open(blk)) {
+ blk_dev_eject_request(blk, force);
+ if (!force) {
+ error_setg(errp, "Device '%s' is locked",
+ bdrv_get_device_name(bs));
+ goto out;
+ }
+ }
+
+ bdrv_close(bs);
+
+out:
+ aio_context_release(aio_context);
+}
+
+void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
+{
+ BlockBackend *blk;
+
+ blk = blk_by_name(device);
+ if (!blk) {
+ error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
+ "Device '%s' not found", device);
+ return;
+ }
+
+ eject_device(blk, force, errp);
+}
+
+void qmp_block_passwd(bool has_device, const char *device,
+ bool has_node_name, const char *node_name,
+ const char *password, Error **errp)
+{
+ Error *local_err = NULL;
+ BlockDriverState *bs;
+ AioContext *aio_context;
+
+ bs = bdrv_lookup_bs(has_device ? device : NULL,
+ has_node_name ? node_name : NULL,
+ &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ return;
+ }
+
+ aio_context = bdrv_get_aio_context(bs);
+ aio_context_acquire(aio_context);
+
+ bdrv_add_key(bs, password, errp);
+
+ aio_context_release(aio_context);
+}
+
+/* Assumes AioContext is held */
+static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
+ int bdrv_flags, BlockDriver *drv,
+ const char *password, Error **errp)
+{
+ Error *local_err = NULL;
+ int ret;
+
+ ret = bdrv_open(&bs, filename, NULL, NULL, bdrv_flags, drv, &local_err);
+ if (ret < 0) {
+ error_propagate(errp, local_err);
+ return;
+ }
+
+ bdrv_add_key(bs, password, errp);
+}
+
+void qmp_change_blockdev(const char *device, const char *filename,
+ const char *format, Error **errp)
+{
+ BlockBackend *blk;
+ BlockDriverState *bs;
+ AioContext *aio_context;
+ BlockDriver *drv = NULL;
+ int bdrv_flags;
+ Error *err = NULL;
+
+ blk = blk_by_name(device);
+ if (!blk) {
+ error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
+ "Device '%s' not found", device);
+ return;
+ }
+ bs = blk_bs(blk);
+
+ aio_context = bdrv_get_aio_context(bs);
+ aio_context_acquire(aio_context);
+
+ if (format) {
+ drv = bdrv_find_whitelisted_format(format, bs->read_only);
+ if (!drv) {
+ error_setg(errp, QERR_INVALID_BLOCK_FORMAT, format);
+ goto out;
+ }
+ }
+
+ eject_device(blk, 0, &err);
+ if (err) {
+ error_propagate(errp, err);
+ goto out;
+ }
+
+ bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
+ bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
+
+ qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
+
+out:
+ aio_context_release(aio_context);
+}
+
+/* throttling disk I/O limits */
+void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
+ int64_t bps_wr,
+ int64_t iops,
+ int64_t iops_rd,
+ int64_t iops_wr,
+ bool has_bps_max,
+ int64_t bps_max,
+ bool has_bps_rd_max,
+ int64_t bps_rd_max,
+ bool has_bps_wr_max,
+ int64_t bps_wr_max,
+ bool has_iops_max,
+ int64_t iops_max,
+ bool has_iops_rd_max,
+ int64_t iops_rd_max,
+ bool has_iops_wr_max,
+ int64_t iops_wr_max,
+ bool has_iops_size,
+ int64_t iops_size,
+ bool has_group,
+ const char *group, Error **errp)
+{
+ ThrottleConfig cfg;
+ BlockDriverState *bs;
+ BlockBackend *blk;
+ AioContext *aio_context;
+
+ blk = blk_by_name(device);
+ if (!blk) {
+ error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
+ "Device '%s' not found", device);
+ return;
+ }
+ bs = blk_bs(blk);
+
+ memset(&cfg, 0, sizeof(cfg));
+ cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps;
+ cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd;
+ cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr;
+
+ cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops;
+ cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd;
+ cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr;
+
+ if (has_bps_max) {
+ cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max;
+ }
+ if (has_bps_rd_max) {
+ cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max;
+ }
+ if (has_bps_wr_max) {
+ cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max;
+ }
+ if (has_iops_max) {
+ cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max;
+ }
+ if (has_iops_rd_max) {
+ cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max;
+ }
+ if (has_iops_wr_max) {
+ cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max;
+ }
+
+ if (has_iops_size) {
+ cfg.op_size = iops_size;
+ }
+
+ if (!check_throttle_config(&cfg, errp)) {
+ return;
+ }
+
+ aio_context = bdrv_get_aio_context(bs);
+ aio_context_acquire(aio_context);
+
+ if (throttle_enabled(&cfg)) {
+ /* Enable I/O limits if they're not enabled yet, otherwise
+ * just update the throttling group. */
+ if (!bs->io_limits_enabled) {
+ bdrv_io_limits_enable(bs, has_group ? group : device);
+ } else if (has_group) {
+ bdrv_io_limits_update_group(bs, group);
+ }
+ /* Set the new throttling configuration */
+ bdrv_set_io_limits(bs, &cfg);
+ } else if (bs->io_limits_enabled) {
+ /* If all throttling settings are set to 0, disable I/O limits */
+ bdrv_io_limits_disable(bs);
+ }
+
+ aio_context_release(aio_context);
+}
+
+void qmp_block_dirty_bitmap_add(const char *node, const char *name,
+ bool has_granularity, uint32_t granularity,
+ Error **errp)
+{
+ AioContext *aio_context;
+ BlockDriverState *bs;
+
+ if (!name || name[0] == '\0') {
+ error_setg(errp, "Bitmap name cannot be empty");
+ return;
+ }
+
+ bs = bdrv_lookup_bs(node, node, errp);
+ if (!bs) {
+ return;
+ }
+
+ aio_context = bdrv_get_aio_context(bs);
+ aio_context_acquire(aio_context);
+
+ if (has_granularity) {
+ if (granularity < 512 || !is_power_of_2(granularity)) {
+ error_setg(errp, "Granularity must be power of 2 "
+ "and at least 512");
+ goto out;
+ }
+ } else {
+ /* Default to cluster size, if available: */
+ granularity = bdrv_get_default_bitmap_granularity(bs);
+ }
+
+ bdrv_create_dirty_bitmap(bs, granularity, name, errp);
+
+ out:
+ aio_context_release(aio_context);
+}
+
+void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
+ Error **errp)
+{
+ AioContext *aio_context;
+ BlockDriverState *bs;
+ BdrvDirtyBitmap *bitmap;
+
+ bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
+ if (!bitmap || !bs) {
+ return;
+ }
+
+ if (bdrv_dirty_bitmap_frozen(bitmap)) {
+ error_setg(errp,
+ "Bitmap '%s' is currently frozen and cannot be removed",
+ name);
+ goto out;
+ }
+ bdrv_dirty_bitmap_make_anon(bitmap);
+ bdrv_release_dirty_bitmap(bs, bitmap);
+
+ out:
+ aio_context_release(aio_context);
+}
+
+/**
+ * Completely clear a bitmap, for the purposes of synchronizing a bitmap
+ * immediately after a full backup operation.
+ */
+void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
+ Error **errp)
+{
+ AioContext *aio_context;
+ BdrvDirtyBitmap *bitmap;
+ BlockDriverState *bs;
+
+ bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
+ if (!bitmap || !bs) {
+ return;
+ }
+
+ if (bdrv_dirty_bitmap_frozen(bitmap)) {
+ error_setg(errp,
+ "Bitmap '%s' is currently frozen and cannot be modified",
+ name);
+ goto out;
+ } else if (!bdrv_dirty_bitmap_enabled(bitmap)) {
+ error_setg(errp,
+ "Bitmap '%s' is currently disabled and cannot be cleared",
+ name);
+ goto out;
+ }
+
+ bdrv_clear_dirty_bitmap(bitmap);
+
+ out:
+ aio_context_release(aio_context);
+}
+
+void hmp_drive_del(Monitor *mon, const QDict *qdict)
+{
+ const char *id = qdict_get_str(qdict, "id");
+ BlockBackend *blk;
+ BlockDriverState *bs;
+ AioContext *aio_context;
+ Error *local_err = NULL;
+
+ blk = blk_by_name(id);
+ if (!blk) {
+ error_report("Device '%s' not found", id);
+ return;
+ }
+ bs = blk_bs(blk);
+
+ if (!blk_legacy_dinfo(blk)) {
+ error_report("Deleting device added with blockdev-add"
+ " is not supported");
+ return;
+ }
+
+ aio_context = bdrv_get_aio_context(bs);
+ aio_context_acquire(aio_context);
+
+ if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
+ error_report_err(local_err);
+ aio_context_release(aio_context);
+ return;
+ }
+
+ bdrv_close(bs);
+
+ /* if we have a device attached to this BlockDriverState
+ * then we need to make the drive anonymous until the device
+ * can be removed. If this is a drive with no device backing
+ * then we can just get rid of the block driver state right here.
+ */
+ if (blk_get_attached_dev(blk)) {
+ blk_hide_on_behalf_of_hmp_drive_del(blk);
+ /* Further I/O must not pause the guest */
+ bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT,
+ BLOCKDEV_ON_ERROR_REPORT);
+ } else {
+ blk_unref(blk);
+ }
+
+ aio_context_release(aio_context);
+}
+
+void qmp_block_resize(bool has_device, const char *device,
+ bool has_node_name, const char *node_name,
+ int64_t size, Error **errp)
+{
+ Error *local_err = NULL;
+ BlockDriverState *bs;
+ AioContext *aio_context;
+ int ret;
+
+ bs = bdrv_lookup_bs(has_device ? device : NULL,
+ has_node_name ? node_name : NULL,
+ &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ return;
+ }
+
+ aio_context = bdrv_get_aio_context(bs);
+ aio_context_acquire(aio_context);
+
+ if (!bdrv_is_first_non_filter(bs)) {
+ error_setg(errp, QERR_FEATURE_DISABLED, "resize");
+ goto out;
+ }
+
+ if (size < 0) {
+ error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
+ goto out;
+ }
+
+ if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
+ error_setg(errp, QERR_DEVICE_IN_USE, device);
+ goto out;
+ }
+
+ /* complete all in-flight operations before resizing the device */
+ bdrv_drain_all();
+
+ ret = bdrv_truncate(bs, size);
+ switch (ret) {
+ case 0:
+ break;
+ case -ENOMEDIUM:
+ error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
+ break;
+ case -ENOTSUP:
+ error_setg(errp, QERR_UNSUPPORTED);
+ break;
+ case -EACCES:
+ error_setg(errp, "Device '%s' is read only", device);
+ break;
+ case -EBUSY:
+ error_setg(errp, QERR_DEVICE_IN_USE, device);
+ break;
+ default:
+ error_setg_errno(errp, -ret, "Could not resize");
+ break;
+ }
+
+out:
+ aio_context_release(aio_context);
+}
+
+static void block_job_cb(void *opaque, int ret)
+{
+ /* Note that this function may be executed from another AioContext besides
+ * the QEMU main loop. If you need to access anything that assumes the
+ * QEMU global mutex, use a BH or introduce a mutex.
+ */
+
+ BlockDriverState *bs = opaque;
+ const char *msg = NULL;
+
+ trace_block_job_cb(bs, bs->job, ret);
+
+ assert(bs->job);
+
+ if (ret < 0) {
+ msg = strerror(-ret);
+ }
+
+ if (block_job_is_cancelled(bs->job)) {
+ block_job_event_cancelled(bs->job);
+ } else {
+ block_job_event_completed(bs->job, msg);
+ }
+
+ bdrv_put_ref_bh_schedule(bs);
+}
+
+void qmp_block_stream(const char *device,
+ bool has_base, const char *base,
+ bool has_backing_file, const char *backing_file,
+ bool has_speed, int64_t speed,
+ bool has_on_error, BlockdevOnError on_error,
+ Error **errp)
+{
+ BlockBackend *blk;
+ BlockDriverState *bs;
+ BlockDriverState *base_bs = NULL;
+ AioContext *aio_context;
+ Error *local_err = NULL;
+ const char *base_name = NULL;
+
+ if (!has_on_error) {
+ on_error = BLOCKDEV_ON_ERROR_REPORT;
+ }
+
+ blk = blk_by_name(device);
+ if (!blk) {
+ error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
+ "Device '%s' not found", device);
+ return;
+ }
+ bs = blk_bs(blk);
+
+ aio_context = bdrv_get_aio_context(bs);
+ aio_context_acquire(aio_context);
+
+ if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) {
+ goto out;
+ }
+
+ if (has_base) {
+ base_bs = bdrv_find_backing_image(bs, base);
+ if (base_bs == NULL) {
+ error_setg(errp, QERR_BASE_NOT_FOUND, base);
+ goto out;
+ }
+ assert(bdrv_get_aio_context(base_bs) == aio_context);
+ base_name = base;
+ }
+
+ /* if we are streaming the entire chain, the result will have no backing
+ * file, and specifying one is therefore an error */
+ if (base_bs == NULL && has_backing_file) {
+ error_setg(errp, "backing file specified, but streaming the "
+ "entire chain");
+ goto out;
+ }
+
+ /* backing_file string overrides base bs filename */
+ base_name = has_backing_file ? backing_file : base_name;
+
+ stream_start(bs, base_bs, base_name, has_speed ? speed : 0,
+ on_error, block_job_cb, bs, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ goto out;
+ }
+
+ trace_qmp_block_stream(bs, bs->job);
+
+out:
+ aio_context_release(aio_context);
+}
+
+void qmp_block_commit(const char *device,
+ bool has_base, const char *base,
+ bool has_top, const char *top,
+ bool has_backing_file, const char *backing_file,
+ bool has_speed, int64_t speed,
+ Error **errp)
+{
+ BlockBackend *blk;
+ BlockDriverState *bs;
+ BlockDriverState *base_bs, *top_bs;
+ AioContext *aio_context;
+ Error *local_err = NULL;
+ /* This will be part of the QMP command, if/when the
+ * BlockdevOnError change for blkmirror makes it in
+ */
+ BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
+
+ if (!has_speed) {
+ speed = 0;
+ }
+
+ /* Important Note:
+ * libvirt relies on the DeviceNotFound error class in order to probe for
+ * live commit feature versions; for this to work, we must make sure to
+ * perform the device lookup before any generic errors that may occur in a
+ * scenario in which all optional arguments are omitted. */
+ blk = blk_by_name(device);
+ if (!blk) {
+ error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
+ "Device '%s' not found", device);
+ return;
+ }
+ bs = blk_bs(blk);
+
+ aio_context = bdrv_get_aio_context(bs);
+ aio_context_acquire(aio_context);
+
+ if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
+ goto out;
+ }
+
+ /* default top_bs is the active layer */
+ top_bs = bs;
+
+ if (has_top && top) {
+ if (strcmp(bs->filename, top) != 0) {
+ top_bs = bdrv_find_backing_image(bs, top);
+ }
+ }
+
+ if (top_bs == NULL) {
+ error_setg(errp, "Top image file %s not found", top ? top : "NULL");
+ goto out;
+ }
+
+ assert(bdrv_get_aio_context(top_bs) == aio_context);
+
+ if (has_base && base) {
+ base_bs = bdrv_find_backing_image(top_bs, base);
+ } else {
+ base_bs = bdrv_find_base(top_bs);
+ }
+
+ if (base_bs == NULL) {
+ error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
+ goto out;
+ }
+
+ assert(bdrv_get_aio_context(base_bs) == aio_context);
+
+ if (bdrv_op_is_blocked(base_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
+ goto out;
+ }
+
+ /* Do not allow attempts to commit an image into itself */
+ if (top_bs == base_bs) {
+ error_setg(errp, "cannot commit an image into itself");
+ goto out;
+ }
+
+ if (top_bs == bs) {
+ if (has_backing_file) {
+ error_setg(errp, "'backing-file' specified,"
+ " but 'top' is the active layer");
+ goto out;
+ }
+ commit_active_start(bs, base_bs, speed, on_error, block_job_cb,
+ bs, &local_err);
+ } else {
+ commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
+ has_backing_file ? backing_file : NULL, &local_err);
+ }
+ if (local_err != NULL) {
+ error_propagate(errp, local_err);
+ goto out;
+ }
+
+out:
+ aio_context_release(aio_context);
+}
+
+void qmp_drive_backup(const char *device, const char *target,
+ bool has_format, const char *format,
+ enum MirrorSyncMode sync,
+ bool has_mode, enum NewImageMode mode,
+ bool has_speed, int64_t speed,
+ bool has_bitmap, const char *bitmap,
+ bool has_on_source_error, BlockdevOnError on_source_error,
+ bool has_on_target_error, BlockdevOnError on_target_error,
+ Error **errp)
+{
+ BlockBackend *blk;
+ BlockDriverState *bs;
+ BlockDriverState *target_bs;
+ BlockDriverState *source = NULL;
+ BdrvDirtyBitmap *bmap = NULL;
+ AioContext *aio_context;
+ BlockDriver *drv = NULL;
+ Error *local_err = NULL;
+ int flags;
+ int64_t size;
+ int ret;
+
+ if (!has_speed) {
+ speed = 0;
+ }
+ if (!has_on_source_error) {
+ on_source_error = BLOCKDEV_ON_ERROR_REPORT;
+ }
+ if (!has_on_target_error) {
+ on_target_error = BLOCKDEV_ON_ERROR_REPORT;
+ }
+ if (!has_mode) {
+ mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
+ }
+
+ blk = blk_by_name(device);
+ if (!blk) {
+ error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
+ "Device '%s' not found", device);
+ return;
+ }
+ bs = blk_bs(blk);
+
+ aio_context = bdrv_get_aio_context(bs);
+ aio_context_acquire(aio_context);
+
+ /* Although backup_run has this check too, we need to use bs->drv below, so
+ * do an early check redundantly. */
+ if (!bdrv_is_inserted(bs)) {
+ error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
+ goto out;
+ }
+
+ if (!has_format) {
+ format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
+ }
+ if (format) {
+ drv = bdrv_find_format(format);
+ if (!drv) {
+ error_setg(errp, QERR_INVALID_BLOCK_FORMAT, format);
+ goto out;
+ }
+ }
+
+ /* Early check to avoid creating target */
+ if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
+ goto out;
+ }
+
+ flags = bs->open_flags | BDRV_O_RDWR;
+
+ /* See if we have a backing HD we can use to create our new image
+ * on top of. */
+ if (sync == MIRROR_SYNC_MODE_TOP) {
+ source = bs->backing_hd;
+ if (!source) {
+ sync = MIRROR_SYNC_MODE_FULL;
+ }
+ }
+ if (sync == MIRROR_SYNC_MODE_NONE) {
+ source = bs;
+ }
+
+ size = bdrv_getlength(bs);
+ if (size < 0) {
+ error_setg_errno(errp, -size, "bdrv_getlength failed");
+ goto out;
+ }
+
+ if (mode != NEW_IMAGE_MODE_EXISTING) {
+ assert(format && drv);
+ if (source) {
+ bdrv_img_create(target, format, source->filename,
+ source->drv->format_name, NULL,
+ size, flags, &local_err, false);
+ } else {
+ bdrv_img_create(target, format, NULL, NULL, NULL,
+ size, flags, &local_err, false);
+ }
+ }
+
+ if (local_err) {
+ error_propagate(errp, local_err);
+ goto out;
+ }
+
+ target_bs = NULL;
+ ret = bdrv_open(&target_bs, target, NULL, NULL, flags, drv, &local_err);
+ if (ret < 0) {
+ error_propagate(errp, local_err);
+ goto out;
+ }
+
+ bdrv_set_aio_context(target_bs, aio_context);
+
+ if (has_bitmap) {
+ bmap = bdrv_find_dirty_bitmap(bs, bitmap);
+ if (!bmap) {
+ error_setg(errp, "Bitmap '%s' could not be found", bitmap);
+ goto out;
+ }
+ }
+
+ backup_start(bs, target_bs, speed, sync, bmap,
+ on_source_error, on_target_error,
+ block_job_cb, bs, &local_err);
+ if (local_err != NULL) {
+ bdrv_unref(target_bs);
+ error_propagate(errp, local_err);
+ goto out;
+ }
+
+out:
+ aio_context_release(aio_context);
+}
+
+BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
+{
+ return bdrv_named_nodes_list(errp);
+}
+
+void qmp_blockdev_backup(const char *device, const char *target,
+ enum MirrorSyncMode sync,
+ bool has_speed, int64_t speed,
+ bool has_on_source_error,
+ BlockdevOnError on_source_error,
+ bool has_on_target_error,
+ BlockdevOnError on_target_error,
+ Error **errp)
+{
+ BlockBackend *blk;
+ BlockDriverState *bs;
+ BlockDriverState *target_bs;
+ Error *local_err = NULL;
+ AioContext *aio_context;
+
+ if (!has_speed) {
+ speed = 0;
+ }
+ if (!has_on_source_error) {
+ on_source_error = BLOCKDEV_ON_ERROR_REPORT;
+ }
+ if (!has_on_target_error) {
+ on_target_error = BLOCKDEV_ON_ERROR_REPORT;
+ }
+
+ blk = blk_by_name(device);
+ if (!blk) {
+ error_setg(errp, "Device '%s' not found", device);
+ return;
+ }
+ bs = blk_bs(blk);
+
+ aio_context = bdrv_get_aio_context(bs);
+ aio_context_acquire(aio_context);
+
+ blk = blk_by_name(target);
+ if (!blk) {
+ error_setg(errp, "Device '%s' not found", target);
+ goto out;
+ }
+ target_bs = blk_bs(blk);
+
+ bdrv_ref(target_bs);
+ bdrv_set_aio_context(target_bs, aio_context);
+ backup_start(bs, target_bs, speed, sync, NULL, on_source_error,
+ on_target_error, block_job_cb, bs, &local_err);
+ if (local_err != NULL) {
+ bdrv_unref(target_bs);
+ error_propagate(errp, local_err);
+ }
+out:
+ aio_context_release(aio_context);
+}
+
+void qmp_drive_mirror(const char *device, const char *target,
+ bool has_format, const char *format,
+ bool has_node_name, const char *node_name,
+ bool has_replaces, const char *replaces,
+ enum MirrorSyncMode sync,
+ bool has_mode, enum NewImageMode mode,
+ bool has_speed, int64_t speed,
+ bool has_granularity, uint32_t granularity,
+ bool has_buf_size, int64_t buf_size,
+ bool has_on_source_error, BlockdevOnError on_source_error,
+ bool has_on_target_error, BlockdevOnError on_target_error,
+ bool has_unmap, bool unmap,
+ Error **errp)
+{
+ BlockBackend *blk;
+ BlockDriverState *bs;
+ BlockDriverState *source, *target_bs;
+ AioContext *aio_context;
+ BlockDriver *drv = NULL;
+ Error *local_err = NULL;
+ QDict *options = NULL;
+ int flags;
+ int64_t size;
+ int ret;
+
+ if (!has_speed) {
+ speed = 0;
+ }
+ if (!has_on_source_error) {
+ on_source_error = BLOCKDEV_ON_ERROR_REPORT;
+ }
+ if (!has_on_target_error) {
+ on_target_error = BLOCKDEV_ON_ERROR_REPORT;
+ }
+ if (!has_mode) {
+ mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
+ }
+ if (!has_granularity) {
+ granularity = 0;
+ }
+ if (!has_buf_size) {
+ buf_size = 0;
+ }
+ if (!has_unmap) {
+ unmap = true;
+ }
+
+ if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
+ error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
+ "a value in range [512B, 64MB]");
+ return;
+ }
+ if (granularity & (granularity - 1)) {
+ error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
+ "power of 2");
+ return;
+ }
+
+ blk = blk_by_name(device);
+ if (!blk) {
+ error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
+ "Device '%s' not found", device);
+ return;
+ }
+ bs = blk_bs(blk);
+
+ aio_context = bdrv_get_aio_context(bs);
+ aio_context_acquire(aio_context);
+
+ if (!bdrv_is_inserted(bs)) {
+ error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
+ goto out;
+ }
+
+ if (!has_format) {
+ format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
+ }
+ if (format) {
+ drv = bdrv_find_format(format);
+ if (!drv) {
+ error_setg(errp, QERR_INVALID_BLOCK_FORMAT, format);
+ goto out;
+ }
+ }
+
+ if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR, errp)) {
+ goto out;
+ }
+
+ flags = bs->open_flags | BDRV_O_RDWR;
+ source = bs->backing_hd;
+ if (!source && sync == MIRROR_SYNC_MODE_TOP) {
+ sync = MIRROR_SYNC_MODE_FULL;
+ }
+ if (sync == MIRROR_SYNC_MODE_NONE) {
+ source = bs;
+ }
+
+ size = bdrv_getlength(bs);
+ if (size < 0) {
+ error_setg_errno(errp, -size, "bdrv_getlength failed");
+ goto out;
+ }
+
+ if (has_replaces) {
+ BlockDriverState *to_replace_bs;
+ AioContext *replace_aio_context;
+ int64_t replace_size;
+
+ if (!has_node_name) {
+ error_setg(errp, "a node-name must be provided when replacing a"
+ " named node of the graph");
+ goto out;
+ }
+
+ to_replace_bs = check_to_replace_node(replaces, &local_err);
+
+ if (!to_replace_bs) {
+ error_propagate(errp, local_err);
+ goto out;
+ }
+
+ replace_aio_context = bdrv_get_aio_context(to_replace_bs);
+ aio_context_acquire(replace_aio_context);
+ replace_size = bdrv_getlength(to_replace_bs);
+ aio_context_release(replace_aio_context);
+
+ if (size != replace_size) {
+ error_setg(errp, "cannot replace image with a mirror image of "
+ "different size");
+ goto out;
+ }
+ }
+
+ if ((sync == MIRROR_SYNC_MODE_FULL || !source)
+ && mode != NEW_IMAGE_MODE_EXISTING)
+ {
+ /* create new image w/o backing file */
+ assert(format && drv);
+ bdrv_img_create(target, format,
+ NULL, NULL, NULL, size, flags, &local_err, false);
+ } else {
+ switch (mode) {
+ case NEW_IMAGE_MODE_EXISTING:
+ break;
+ case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
+ /* create new image with backing file */
+ bdrv_img_create(target, format,
+ source->filename,
+ source->drv->format_name,
+ NULL, size, flags, &local_err, false);
+ break;
+ default:
+ abort();
+ }
+ }
+
+ if (local_err) {
+ error_propagate(errp, local_err);
+ goto out;
+ }
+
+ if (has_node_name) {
+ options = qdict_new();
+ qdict_put(options, "node-name", qstring_from_str(node_name));
+ }
+
+ /* Mirroring takes care of copy-on-write using the source's backing
+ * file.
+ */
+ target_bs = NULL;
+ ret = bdrv_open(&target_bs, target, NULL, options,
+ flags | BDRV_O_NO_BACKING, drv, &local_err);
+ if (ret < 0) {
+ error_propagate(errp, local_err);
+ goto out;
+ }
+
+ bdrv_set_aio_context(target_bs, aio_context);
+
+ /* pass the node name to replace to mirror start since it's loose coupling
+ * and will allow to check whether the node still exist at mirror completion
+ */
+ mirror_start(bs, target_bs,
+ has_replaces ? replaces : NULL,
+ speed, granularity, buf_size, sync,
+ on_source_error, on_target_error,
+ unmap,
+ block_job_cb, bs, &local_err);
+ if (local_err != NULL) {
+ bdrv_unref(target_bs);
+ error_propagate(errp, local_err);
+ goto out;
+ }
+
+out:
+ aio_context_release(aio_context);
+}
+
+/* Get the block job for a given device name and acquire its AioContext */
+static BlockJob *find_block_job(const char *device, AioContext **aio_context,
+ Error **errp)
+{
+ BlockBackend *blk;
+ BlockDriverState *bs;
+
+ blk = blk_by_name(device);
+ if (!blk) {
+ goto notfound;
+ }
+ bs = blk_bs(blk);
+
+ *aio_context = bdrv_get_aio_context(bs);
+ aio_context_acquire(*aio_context);
+
+ if (!bs->job) {
+ aio_context_release(*aio_context);
+ goto notfound;
+ }
+
+ return bs->job;
+
+notfound:
+ error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
+ "No active block job on device '%s'", device);
+ *aio_context = NULL;
+ return NULL;
+}
+
+void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
+{
+ AioContext *aio_context;
+ BlockJob *job = find_block_job(device, &aio_context, errp);
+
+ if (!job) {
+ return;
+ }
+
+ block_job_set_speed(job, speed, errp);
+ aio_context_release(aio_context);
+}
+
+void qmp_block_job_cancel(const char *device,
+ bool has_force, bool force, Error **errp)
+{
+ AioContext *aio_context;
+ BlockJob *job = find_block_job(device, &aio_context, errp);
+
+ if (!job) {
+ return;
+ }
+
+ if (!has_force) {
+ force = false;
+ }
+
+ if (job->user_paused && !force) {
+ error_setg(errp, "The block job for device '%s' is currently paused",
+ device);
+ goto out;
+ }
+
+ trace_qmp_block_job_cancel(job);
+ block_job_cancel(job);
+out:
+ aio_context_release(aio_context);
+}
+
+void qmp_block_job_pause(const char *device, Error **errp)
+{
+ AioContext *aio_context;
+ BlockJob *job = find_block_job(device, &aio_context, errp);
+
+ if (!job || job->user_paused) {
+ return;
+ }
+
+ job->user_paused = true;
+ trace_qmp_block_job_pause(job);
+ block_job_pause(job);
+ aio_context_release(aio_context);
+}
+
+void qmp_block_job_resume(const char *device, Error **errp)
+{
+ AioContext *aio_context;
+ BlockJob *job = find_block_job(device, &aio_context, errp);
+
+ if (!job || !job->user_paused) {
+ return;
+ }
+
+ job->user_paused = false;
+ trace_qmp_block_job_resume(job);
+ block_job_resume(job);
+ aio_context_release(aio_context);
+}
+
+void qmp_block_job_complete(const char *device, Error **errp)
+{
+ AioContext *aio_context;
+ BlockJob *job = find_block_job(device, &aio_context, errp);
+
+ if (!job) {
+ return;
+ }
+
+ trace_qmp_block_job_complete(job);
+ block_job_complete(job, errp);
+ aio_context_release(aio_context);
+}
+
+void qmp_change_backing_file(const char *device,
+ const char *image_node_name,
+ const char *backing_file,
+ Error **errp)
+{
+ BlockBackend *blk;
+ BlockDriverState *bs = NULL;
+ AioContext *aio_context;
+ BlockDriverState *image_bs = NULL;
+ Error *local_err = NULL;
+ bool ro;
+ int open_flags;
+ int ret;
+
+ blk = blk_by_name(device);
+ if (!blk) {
+ error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
+ "Device '%s' not found", device);
+ return;
+ }
+ bs = blk_bs(blk);
+
+ aio_context = bdrv_get_aio_context(bs);
+ aio_context_acquire(aio_context);
+
+ image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ goto out;
+ }
+
+ if (!image_bs) {
+ error_setg(errp, "image file not found");
+ goto out;
+ }
+
+ if (bdrv_find_base(image_bs) == image_bs) {
+ error_setg(errp, "not allowing backing file change on an image "
+ "without a backing file");
+ goto out;
+ }
+
+ /* even though we are not necessarily operating on bs, we need it to
+ * determine if block ops are currently prohibited on the chain */
+ if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
+ goto out;
+ }
+
+ /* final sanity check */
+ if (!bdrv_chain_contains(bs, image_bs)) {
+ error_setg(errp, "'%s' and image file are not in the same chain",
+ device);
+ goto out;
+ }
+
+ /* if not r/w, reopen to make r/w */
+ open_flags = image_bs->open_flags;
+ ro = bdrv_is_read_only(image_bs);
+
+ if (ro) {
+ bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ goto out;
+ }
+ }
+
+ ret = bdrv_change_backing_file(image_bs, backing_file,
+ image_bs->drv ? image_bs->drv->format_name : "");
+
+ if (ret < 0) {
+ error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
+ backing_file);
+ /* don't exit here, so we can try to restore open flags if
+ * appropriate */
+ }
+
+ if (ro) {
+ bdrv_reopen(image_bs, open_flags, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err); /* will preserve prior errp */
+ }
+ }
+
+out:
+ aio_context_release(aio_context);
+}
+
+void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
+{
+ QmpOutputVisitor *ov = qmp_output_visitor_new();
+ BlockBackend *blk;
+ QObject *obj;
+ QDict *qdict;
+ Error *local_err = NULL;
+
+ /* Require an ID in the top level */
+ if (!options->has_id) {
+ error_setg(errp, "Block device needs an ID");
+ goto fail;
+ }
+
+ /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with
+ * cache.direct=false instead of silently switching to aio=threads, except
+ * when called from drive_new().
+ *
+ * For now, simply forbidding the combination for all drivers will do. */
+ if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) {
+ bool direct = options->has_cache &&
+ options->cache->has_direct &&
+ options->cache->direct;
+ if (!direct) {
+ error_setg(errp, "aio=native requires cache.direct=true");
+ goto fail;
+ }
+ }
+
+ visit_type_BlockdevOptions(qmp_output_get_visitor(ov),
+ &options, NULL, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ goto fail;
+ }
+
+ obj = qmp_output_get_qobject(ov);
+ qdict = qobject_to_qdict(obj);
+
+ qdict_flatten(qdict);
+
+ blk = blockdev_init(NULL, qdict, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ goto fail;
+ }
+
+ if (bdrv_key_required(blk_bs(blk))) {
+ blk_unref(blk);
+ error_setg(errp, "blockdev-add doesn't support encrypted devices");
+ goto fail;
+ }
+
+fail:
+ qmp_output_visitor_cleanup(ov);
+}
+
+BlockJobInfoList *qmp_query_block_jobs(Error **errp)
+{
+ BlockJobInfoList *head = NULL, **p_next = &head;
+ BlockDriverState *bs;
+
+ for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) {
+ AioContext *aio_context = bdrv_get_aio_context(bs);
+
+ aio_context_acquire(aio_context);
+
+ if (bs->job) {
+ BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
+ elem->value = block_job_query(bs->job);
+ *p_next = elem;
+ p_next = &elem->next;
+ }
+
+ aio_context_release(aio_context);
+ }
+
+ return head;
+}
+
+QemuOptsList qemu_common_drive_opts = {
+ .name = "drive",
+ .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
+ .desc = {
+ {
+ .name = "snapshot",
+ .type = QEMU_OPT_BOOL,
+ .help = "enable/disable snapshot mode",
+ },{
+ .name = "discard",
+ .type = QEMU_OPT_STRING,
+ .help = "discard operation (ignore/off, unmap/on)",
+ },{
+ .name = BDRV_OPT_CACHE_WB,
+ .type = QEMU_OPT_BOOL,
+ .help = "enables writeback mode for any caches",
+ },{
+ .name = BDRV_OPT_CACHE_DIRECT,
+ .type = QEMU_OPT_BOOL,
+ .help = "enables use of O_DIRECT (bypass the host page cache)",
+ },{
+ .name = BDRV_OPT_CACHE_NO_FLUSH,
+ .type = QEMU_OPT_BOOL,
+ .help = "ignore any flush requests for the device",
+ },{
+ .name = "aio",
+ .type = QEMU_OPT_STRING,
+ .help = "host AIO implementation (threads, native)",
+ },{
+ .name = "format",
+ .type = QEMU_OPT_STRING,
+ .help = "disk format (raw, qcow2, ...)",
+ },{
+ .name = "rerror",
+ .type = QEMU_OPT_STRING,
+ .help = "read error action",
+ },{
+ .name = "werror",
+ .type = QEMU_OPT_STRING,
+ .help = "write error action",
+ },{
+ .name = "read-only",
+ .type = QEMU_OPT_BOOL,
+ .help = "open drive file as read-only",
+ },{
+ .name = "throttling.iops-total",
+ .type = QEMU_OPT_NUMBER,
+ .help = "limit total I/O operations per second",
+ },{
+ .name = "throttling.iops-read",
+ .type = QEMU_OPT_NUMBER,
+ .help = "limit read operations per second",
+ },{
+ .name = "throttling.iops-write",
+ .type = QEMU_OPT_NUMBER,
+ .help = "limit write operations per second",
+ },{
+ .name = "throttling.bps-total",
+ .type = QEMU_OPT_NUMBER,
+ .help = "limit total bytes per second",
+ },{
+ .name = "throttling.bps-read",
+ .type = QEMU_OPT_NUMBER,
+ .help = "limit read bytes per second",
+ },{
+ .name = "throttling.bps-write",
+ .type = QEMU_OPT_NUMBER,
+ .help = "limit write bytes per second",
+ },{
+ .name = "throttling.iops-total-max",
+ .type = QEMU_OPT_NUMBER,
+ .help = "I/O operations burst",
+ },{
+ .name = "throttling.iops-read-max",
+ .type = QEMU_OPT_NUMBER,
+ .help = "I/O operations read burst",
+ },{
+ .name = "throttling.iops-write-max",
+ .type = QEMU_OPT_NUMBER,
+ .help = "I/O operations write burst",
+ },{
+ .name = "throttling.bps-total-max",
+ .type = QEMU_OPT_NUMBER,
+ .help = "total bytes burst",
+ },{
+ .name = "throttling.bps-read-max",
+ .type = QEMU_OPT_NUMBER,
+ .help = "total bytes read burst",
+ },{
+ .name = "throttling.bps-write-max",
+ .type = QEMU_OPT_NUMBER,
+ .help = "total bytes write burst",
+ },{
+ .name = "throttling.iops-size",
+ .type = QEMU_OPT_NUMBER,
+ .help = "when limiting by iops max size of an I/O in bytes",
+ },{
+ .name = "throttling.group",
+ .type = QEMU_OPT_STRING,
+ .help = "name of the block throttling group",
+ },{
+ .name = "copy-on-read",
+ .type = QEMU_OPT_BOOL,
+ .help = "copy read data from backing file into image file",
+ },{
+ .name = "detect-zeroes",
+ .type = QEMU_OPT_STRING,
+ .help = "try to optimize zero writes (off, on, unmap)",
+ },
+ { /* end of list */ }
+ },
+};
+
+QemuOptsList qemu_drive_opts = {
+ .name = "drive",
+ .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
+ .desc = {
+ /*
+ * no elements => accept any params
+ * validation will happen later
+ */
+ { /* end of list */ }
+ },
+};
Code Review / kvmfornfv.git / blobdiff