Add qemu 2.4.0

Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5
Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>

1 files changed, 805 insertions, 0 deletions

diff --git a/qemu/block/blkdebug.c b/qemu/block/blkdebug.c
new file mode 100644
index 000000000..bc247f46f
--- /dev/null
+++ b/qemu/block/blkdebug.c
@@ -0,0 +1,805 @@
+/*
+ * Block protocol for I/O error injection
+ *
+ * Copyright (c) 2010 Kevin Wolf <kwolf@redhat.com>
+ *
+ * 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 "qemu-common.h"
+#include "qemu/config-file.h"
+#include "block/block_int.h"
+#include "qemu/module.h"
+#include "qapi/qmp/qbool.h"
+#include "qapi/qmp/qdict.h"
+#include "qapi/qmp/qint.h"
+#include "qapi/qmp/qstring.h"
+
+typedef struct BDRVBlkdebugState {
+    int state;
+    int new_state;
+
+    QLIST_HEAD(, BlkdebugRule) rules[BLKDBG_EVENT_MAX];
+    QSIMPLEQ_HEAD(, BlkdebugRule) active_rules;
+    QLIST_HEAD(, BlkdebugSuspendedReq) suspended_reqs;
+} BDRVBlkdebugState;
+
+typedef struct BlkdebugAIOCB {
+    BlockAIOCB common;
+    QEMUBH *bh;
+    int ret;
+} BlkdebugAIOCB;
+
+typedef struct BlkdebugSuspendedReq {
+    Coroutine *co;
+    char *tag;
+    QLIST_ENTRY(BlkdebugSuspendedReq) next;
+} BlkdebugSuspendedReq;
+
+static const AIOCBInfo blkdebug_aiocb_info = {
+    .aiocb_size    = sizeof(BlkdebugAIOCB),
+};
+
+enum {
+    ACTION_INJECT_ERROR,
+    ACTION_SET_STATE,
+    ACTION_SUSPEND,
+};
+
+typedef struct BlkdebugRule {
+    BlkDebugEvent event;
+    int action;
+    int state;
+    union {
+        struct {
+            int error;
+            int immediately;
+            int once;
+            int64_t sector;
+        } inject;
+        struct {
+            int new_state;
+        } set_state;
+        struct {
+            char *tag;
+        } suspend;
+    } options;
+    QLIST_ENTRY(BlkdebugRule) next;
+    QSIMPLEQ_ENTRY(BlkdebugRule) active_next;
+} BlkdebugRule;
+
+static QemuOptsList inject_error_opts = {
+    .name = "inject-error",
+    .head = QTAILQ_HEAD_INITIALIZER(inject_error_opts.head),
+    .desc = {
+        {
+            .name = "event",
+            .type = QEMU_OPT_STRING,
+        },
+        {
+            .name = "state",
+            .type = QEMU_OPT_NUMBER,
+        },
+        {
+            .name = "errno",
+            .type = QEMU_OPT_NUMBER,
+        },
+        {
+            .name = "sector",
+            .type = QEMU_OPT_NUMBER,
+        },
+        {
+            .name = "once",
+            .type = QEMU_OPT_BOOL,
+        },
+        {
+            .name = "immediately",
+            .type = QEMU_OPT_BOOL,
+        },
+        { /* end of list */ }
+    },
+};
+
+static QemuOptsList set_state_opts = {
+    .name = "set-state",
+    .head = QTAILQ_HEAD_INITIALIZER(set_state_opts.head),
+    .desc = {
+        {
+            .name = "event",
+            .type = QEMU_OPT_STRING,
+        },
+        {
+            .name = "state",
+            .type = QEMU_OPT_NUMBER,
+        },
+        {
+            .name = "new_state",
+            .type = QEMU_OPT_NUMBER,
+        },
+        { /* end of list */ }
+    },
+};
+
+static QemuOptsList *config_groups[] = {
+    &inject_error_opts,
+    &set_state_opts,
+    NULL
+};
+
+static const char *event_names[BLKDBG_EVENT_MAX] = {
+    [BLKDBG_L1_UPDATE]                      = "l1_update",
+    [BLKDBG_L1_GROW_ALLOC_TABLE]            = "l1_grow.alloc_table",
+    [BLKDBG_L1_GROW_WRITE_TABLE]            = "l1_grow.write_table",
+    [BLKDBG_L1_GROW_ACTIVATE_TABLE]         = "l1_grow.activate_table",
+
+    [BLKDBG_L2_LOAD]                        = "l2_load",
+    [BLKDBG_L2_UPDATE]                      = "l2_update",
+    [BLKDBG_L2_UPDATE_COMPRESSED]           = "l2_update_compressed",
+    [BLKDBG_L2_ALLOC_COW_READ]              = "l2_alloc.cow_read",
+    [BLKDBG_L2_ALLOC_WRITE]                 = "l2_alloc.write",
+
+    [BLKDBG_READ_AIO]                       = "read_aio",
+    [BLKDBG_READ_BACKING_AIO]               = "read_backing_aio",
+    [BLKDBG_READ_COMPRESSED]                = "read_compressed",
+
+    [BLKDBG_WRITE_AIO]                      = "write_aio",
+    [BLKDBG_WRITE_COMPRESSED]               = "write_compressed",
+
+    [BLKDBG_VMSTATE_LOAD]                   = "vmstate_load",
+    [BLKDBG_VMSTATE_SAVE]                   = "vmstate_save",
+
+    [BLKDBG_COW_READ]                       = "cow_read",
+    [BLKDBG_COW_WRITE]                      = "cow_write",
+
+    [BLKDBG_REFTABLE_LOAD]                  = "reftable_load",
+    [BLKDBG_REFTABLE_GROW]                  = "reftable_grow",
+    [BLKDBG_REFTABLE_UPDATE]                = "reftable_update",
+
+    [BLKDBG_REFBLOCK_LOAD]                  = "refblock_load",
+    [BLKDBG_REFBLOCK_UPDATE]                = "refblock_update",
+    [BLKDBG_REFBLOCK_UPDATE_PART]           = "refblock_update_part",
+    [BLKDBG_REFBLOCK_ALLOC]                 = "refblock_alloc",
+    [BLKDBG_REFBLOCK_ALLOC_HOOKUP]          = "refblock_alloc.hookup",
+    [BLKDBG_REFBLOCK_ALLOC_WRITE]           = "refblock_alloc.write",
+    [BLKDBG_REFBLOCK_ALLOC_WRITE_BLOCKS]    = "refblock_alloc.write_blocks",
+    [BLKDBG_REFBLOCK_ALLOC_WRITE_TABLE]     = "refblock_alloc.write_table",
+    [BLKDBG_REFBLOCK_ALLOC_SWITCH_TABLE]    = "refblock_alloc.switch_table",
+
+    [BLKDBG_CLUSTER_ALLOC]                  = "cluster_alloc",
+    [BLKDBG_CLUSTER_ALLOC_BYTES]            = "cluster_alloc_bytes",
+    [BLKDBG_CLUSTER_FREE]                   = "cluster_free",
+
+    [BLKDBG_FLUSH_TO_OS]                    = "flush_to_os",
+    [BLKDBG_FLUSH_TO_DISK]                  = "flush_to_disk",
+
+    [BLKDBG_PWRITEV_RMW_HEAD]               = "pwritev_rmw.head",
+    [BLKDBG_PWRITEV_RMW_AFTER_HEAD]         = "pwritev_rmw.after_head",
+    [BLKDBG_PWRITEV_RMW_TAIL]               = "pwritev_rmw.tail",
+    [BLKDBG_PWRITEV_RMW_AFTER_TAIL]         = "pwritev_rmw.after_tail",
+    [BLKDBG_PWRITEV]                        = "pwritev",
+    [BLKDBG_PWRITEV_ZERO]                   = "pwritev_zero",
+    [BLKDBG_PWRITEV_DONE]                   = "pwritev_done",
+
+    [BLKDBG_EMPTY_IMAGE_PREPARE]            = "empty_image_prepare",
+};
+
+static int get_event_by_name(const char *name, BlkDebugEvent *event)
+{
+    int i;
+
+    for (i = 0; i < BLKDBG_EVENT_MAX; i++) {
+        if (!strcmp(event_names[i], name)) {
+            *event = i;
+            return 0;
+        }
+    }
+
+    return -1;
+}
+
+struct add_rule_data {
+    BDRVBlkdebugState *s;
+    int action;
+};
+
+static int add_rule(void *opaque, QemuOpts *opts, Error **errp)
+{
+    struct add_rule_data *d = opaque;
+    BDRVBlkdebugState *s = d->s;
+    const char* event_name;
+    BlkDebugEvent event;
+    struct BlkdebugRule *rule;
+
+    /* Find the right event for the rule */
+    event_name = qemu_opt_get(opts, "event");
+    if (!event_name) {
+        error_setg(errp, "Missing event name for rule");
+        return -1;
+    } else if (get_event_by_name(event_name, &event) < 0) {
+        error_setg(errp, "Invalid event name \"%s\"", event_name);
+        return -1;
+    }
+
+    /* Set attributes common for all actions */
+    rule = g_malloc0(sizeof(*rule));
+    *rule = (struct BlkdebugRule) {
+        .event  = event,
+        .action = d->action,
+        .state  = qemu_opt_get_number(opts, "state", 0),
+    };
+
+    /* Parse action-specific options */
+    switch (d->action) {
+    case ACTION_INJECT_ERROR:
+        rule->options.inject.error = qemu_opt_get_number(opts, "errno", EIO);
+        rule->options.inject.once  = qemu_opt_get_bool(opts, "once", 0);
+        rule->options.inject.immediately =
+            qemu_opt_get_bool(opts, "immediately", 0);
+        rule->options.inject.sector = qemu_opt_get_number(opts, "sector", -1);
+        break;
+
+    case ACTION_SET_STATE:
+        rule->options.set_state.new_state =
+            qemu_opt_get_number(opts, "new_state", 0);
+        break;
+
+    case ACTION_SUSPEND:
+        rule->options.suspend.tag =
+            g_strdup(qemu_opt_get(opts, "tag"));
+        break;
+    };
+
+    /* Add the rule */
+    QLIST_INSERT_HEAD(&s->rules[event], rule, next);
+
+    return 0;
+}
+
+static void remove_rule(BlkdebugRule *rule)
+{
+    switch (rule->action) {
+    case ACTION_INJECT_ERROR:
+    case ACTION_SET_STATE:
+        break;
+    case ACTION_SUSPEND:
+        g_free(rule->options.suspend.tag);
+        break;
+    }
+
+    QLIST_REMOVE(rule, next);
+    g_free(rule);
+}
+
+static int read_config(BDRVBlkdebugState *s, const char *filename,
+                       QDict *options, Error **errp)
+{
+    FILE *f = NULL;
+    int ret;
+    struct add_rule_data d;
+    Error *local_err = NULL;
+
+    if (filename) {
+        f = fopen(filename, "r");
+        if (f == NULL) {
+            error_setg_errno(errp, errno, "Could not read blkdebug config file");
+            return -errno;
+        }
+
+        ret = qemu_config_parse(f, config_groups, filename);
+        if (ret < 0) {
+            error_setg(errp, "Could not parse blkdebug config file");
+            ret = -EINVAL;
+            goto fail;
+        }
+    }
+
+    qemu_config_parse_qdict(options, config_groups, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        ret = -EINVAL;
+        goto fail;
+    }
+
+    d.s = s;
+    d.action = ACTION_INJECT_ERROR;
+    qemu_opts_foreach(&inject_error_opts, add_rule, &d, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        ret = -EINVAL;
+        goto fail;
+    }
+
+    d.action = ACTION_SET_STATE;
+    qemu_opts_foreach(&set_state_opts, add_rule, &d, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        ret = -EINVAL;
+        goto fail;
+    }
+
+    ret = 0;
+fail:
+    qemu_opts_reset(&inject_error_opts);
+    qemu_opts_reset(&set_state_opts);
+    if (f) {
+        fclose(f);
+    }
+    return ret;
+}
+
+/* Valid blkdebug filenames look like blkdebug:path/to/config:path/to/image */
+static void blkdebug_parse_filename(const char *filename, QDict *options,
+                                    Error **errp)
+{
+    const char *c;
+
+    /* Parse the blkdebug: prefix */
+    if (!strstart(filename, "blkdebug:", &filename)) {
+        /* There was no prefix; therefore, all options have to be already
+           present in the QDict (except for the filename) */
+        qdict_put(options, "x-image", qstring_from_str(filename));
+        return;
+    }
+
+    /* Parse config file path */
+    c = strchr(filename, ':');
+    if (c == NULL) {
+        error_setg(errp, "blkdebug requires both config file and image path");
+        return;
+    }
+
+    if (c != filename) {
+        QString *config_path;
+        config_path = qstring_from_substr(filename, 0, c - filename - 1);
+        qdict_put(options, "config", config_path);
+    }
+
+    /* TODO Allow multi-level nesting and set file.filename here */
+    filename = c + 1;
+    qdict_put(options, "x-image", qstring_from_str(filename));
+}
+
+static QemuOptsList runtime_opts = {
+    .name = "blkdebug",
+    .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
+    .desc = {
+        {
+            .name = "config",
+            .type = QEMU_OPT_STRING,
+            .help = "Path to the configuration file",
+        },
+        {
+            .name = "x-image",
+            .type = QEMU_OPT_STRING,
+            .help = "[internal use only, will be removed]",
+        },
+        {
+            .name = "align",
+            .type = QEMU_OPT_SIZE,
+            .help = "Required alignment in bytes",
+        },
+        { /* end of list */ }
+    },
+};
+
+static int blkdebug_open(BlockDriverState *bs, QDict *options, int flags,
+                         Error **errp)
+{
+    BDRVBlkdebugState *s = bs->opaque;
+    QemuOpts *opts;
+    Error *local_err = NULL;
+    const char *config;
+    uint64_t align;
+    int ret;
+
+    opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
+    qemu_opts_absorb_qdict(opts, options, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        ret = -EINVAL;
+        goto out;
+    }
+
+    /* Read rules from config file or command line options */
+    config = qemu_opt_get(opts, "config");
+    ret = read_config(s, config, options, errp);
+    if (ret) {
+        goto out;
+    }
+
+    /* Set initial state */
+    s->state = 1;
+
+    /* Open the backing file */
+    assert(bs->file == NULL);
+    ret = bdrv_open_image(&bs->file, qemu_opt_get(opts, "x-image"), options, "image",
+                          bs, &child_file, false, &local_err);
+    if (ret < 0) {
+        error_propagate(errp, local_err);
+        goto out;
+    }
+
+    /* Set request alignment */
+    align = qemu_opt_get_size(opts, "align", bs->request_alignment);
+    if (align > 0 && align < INT_MAX && !(align & (align - 1))) {
+        bs->request_alignment = align;
+    } else {
+        error_setg(errp, "Invalid alignment");
+        ret = -EINVAL;
+        goto fail_unref;
+    }
+
+    ret = 0;
+    goto out;
+
+fail_unref:
+    bdrv_unref(bs->file);
+out:
+    qemu_opts_del(opts);
+    return ret;
+}
+
+static void error_callback_bh(void *opaque)
+{
+    struct BlkdebugAIOCB *acb = opaque;
+    qemu_bh_delete(acb->bh);
+    acb->common.cb(acb->common.opaque, acb->ret);
+    qemu_aio_unref(acb);
+}
+
+static BlockAIOCB *inject_error(BlockDriverState *bs,
+    BlockCompletionFunc *cb, void *opaque, BlkdebugRule *rule)
+{
+    BDRVBlkdebugState *s = bs->opaque;
+    int error = rule->options.inject.error;
+    struct BlkdebugAIOCB *acb;
+    QEMUBH *bh;
+    bool immediately = rule->options.inject.immediately;
+
+    if (rule->options.inject.once) {
+        QSIMPLEQ_REMOVE(&s->active_rules, rule, BlkdebugRule, active_next);
+        remove_rule(rule);
+    }
+
+    if (immediately) {
+        return NULL;
+    }
+
+    acb = qemu_aio_get(&blkdebug_aiocb_info, bs, cb, opaque);
+    acb->ret = -error;
+
+    bh = aio_bh_new(bdrv_get_aio_context(bs), error_callback_bh, acb);
+    acb->bh = bh;
+    qemu_bh_schedule(bh);
+
+    return &acb->common;
+}
+
+static BlockAIOCB *blkdebug_aio_readv(BlockDriverState *bs,
+    int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
+    BlockCompletionFunc *cb, void *opaque)
+{
+    BDRVBlkdebugState *s = bs->opaque;
+    BlkdebugRule *rule = NULL;
+
+    QSIMPLEQ_FOREACH(rule, &s->active_rules, active_next) {
+        if (rule->options.inject.sector == -1 ||
+            (rule->options.inject.sector >= sector_num &&
+             rule->options.inject.sector < sector_num + nb_sectors)) {
+            break;
+        }
+    }
+
+    if (rule && rule->options.inject.error) {
+        return inject_error(bs, cb, opaque, rule);
+    }
+
+    return bdrv_aio_readv(bs->file, sector_num, qiov, nb_sectors, cb, opaque);
+}
+
+static BlockAIOCB *blkdebug_aio_writev(BlockDriverState *bs,
+    int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
+    BlockCompletionFunc *cb, void *opaque)
+{
+    BDRVBlkdebugState *s = bs->opaque;
+    BlkdebugRule *rule = NULL;
+
+    QSIMPLEQ_FOREACH(rule, &s->active_rules, active_next) {
+        if (rule->options.inject.sector == -1 ||
+            (rule->options.inject.sector >= sector_num &&
+             rule->options.inject.sector < sector_num + nb_sectors)) {
+            break;
+        }
+    }
+
+    if (rule && rule->options.inject.error) {
+        return inject_error(bs, cb, opaque, rule);
+    }
+
+    return bdrv_aio_writev(bs->file, sector_num, qiov, nb_sectors, cb, opaque);
+}
+
+static BlockAIOCB *blkdebug_aio_flush(BlockDriverState *bs,
+    BlockCompletionFunc *cb, void *opaque)
+{
+    BDRVBlkdebugState *s = bs->opaque;
+    BlkdebugRule *rule = NULL;
+
+    QSIMPLEQ_FOREACH(rule, &s->active_rules, active_next) {
+        if (rule->options.inject.sector == -1) {
+            break;
+        }
+    }
+
+    if (rule && rule->options.inject.error) {
+        return inject_error(bs, cb, opaque, rule);
+    }
+
+    return bdrv_aio_flush(bs->file, cb, opaque);
+}
+
+
+static void blkdebug_close(BlockDriverState *bs)
+{
+    BDRVBlkdebugState *s = bs->opaque;
+    BlkdebugRule *rule, *next;
+    int i;
+
+    for (i = 0; i < BLKDBG_EVENT_MAX; i++) {
+        QLIST_FOREACH_SAFE(rule, &s->rules[i], next, next) {
+            remove_rule(rule);
+        }
+    }
+}
+
+static void suspend_request(BlockDriverState *bs, BlkdebugRule *rule)
+{
+    BDRVBlkdebugState *s = bs->opaque;
+    BlkdebugSuspendedReq r;
+
+    r = (BlkdebugSuspendedReq) {
+        .co         = qemu_coroutine_self(),
+        .tag        = g_strdup(rule->options.suspend.tag),
+    };
+
+    remove_rule(rule);
+    QLIST_INSERT_HEAD(&s->suspended_reqs, &r, next);
+
+    printf("blkdebug: Suspended request '%s'\n", r.tag);
+    qemu_coroutine_yield();
+    printf("blkdebug: Resuming request '%s'\n", r.tag);
+
+    QLIST_REMOVE(&r, next);
+    g_free(r.tag);
+}
+
+static bool process_rule(BlockDriverState *bs, struct BlkdebugRule *rule,
+    bool injected)
+{
+    BDRVBlkdebugState *s = bs->opaque;
+
+    /* Only process rules for the current state */
+    if (rule->state && rule->state != s->state) {
+        return injected;
+    }
+
+    /* Take the action */
+    switch (rule->action) {
+    case ACTION_INJECT_ERROR:
+        if (!injected) {
+            QSIMPLEQ_INIT(&s->active_rules);
+            injected = true;
+        }
+        QSIMPLEQ_INSERT_HEAD(&s->active_rules, rule, active_next);
+        break;
+
+    case ACTION_SET_STATE:
+        s->new_state = rule->options.set_state.new_state;
+        break;
+
+    case ACTION_SUSPEND:
+        suspend_request(bs, rule);
+        break;
+    }
+    return injected;
+}
+
+static void blkdebug_debug_event(BlockDriverState *bs, BlkDebugEvent event)
+{
+    BDRVBlkdebugState *s = bs->opaque;
+    struct BlkdebugRule *rule, *next;
+    bool injected;
+
+    assert((int)event >= 0 && event < BLKDBG_EVENT_MAX);
+
+    injected = false;
+    s->new_state = s->state;
+    QLIST_FOREACH_SAFE(rule, &s->rules[event], next, next) {
+        injected = process_rule(bs, rule, injected);
+    }
+    s->state = s->new_state;
+}
+
+static int blkdebug_debug_breakpoint(BlockDriverState *bs, const char *event,
+                                     const char *tag)
+{
+    BDRVBlkdebugState *s = bs->opaque;
+    struct BlkdebugRule *rule;
+    BlkDebugEvent blkdebug_event;
+
+    if (get_event_by_name(event, &blkdebug_event) < 0) {
+        return -ENOENT;
+    }
+
+
+    rule = g_malloc(sizeof(*rule));
+    *rule = (struct BlkdebugRule) {
+        .event  = blkdebug_event,
+        .action = ACTION_SUSPEND,
+        .state  = 0,
+        .options.suspend.tag = g_strdup(tag),
+    };
+
+    QLIST_INSERT_HEAD(&s->rules[blkdebug_event], rule, next);
+
+    return 0;
+}
+
+static int blkdebug_debug_resume(BlockDriverState *bs, const char *tag)
+{
+    BDRVBlkdebugState *s = bs->opaque;
+    BlkdebugSuspendedReq *r, *next;
+
+    QLIST_FOREACH_SAFE(r, &s->suspended_reqs, next, next) {
+        if (!strcmp(r->tag, tag)) {
+            qemu_coroutine_enter(r->co, NULL);
+            return 0;
+        }
+    }
+    return -ENOENT;
+}
+
+static int blkdebug_debug_remove_breakpoint(BlockDriverState *bs,
+                                            const char *tag)
+{
+    BDRVBlkdebugState *s = bs->opaque;
+    BlkdebugSuspendedReq *r, *r_next;
+    BlkdebugRule *rule, *next;
+    int i, ret = -ENOENT;
+
+    for (i = 0; i < BLKDBG_EVENT_MAX; i++) {
+        QLIST_FOREACH_SAFE(rule, &s->rules[i], next, next) {
+            if (rule->action == ACTION_SUSPEND &&
+                !strcmp(rule->options.suspend.tag, tag)) {
+                remove_rule(rule);
+                ret = 0;
+            }
+        }
+    }
+    QLIST_FOREACH_SAFE(r, &s->suspended_reqs, next, r_next) {
+        if (!strcmp(r->tag, tag)) {
+            qemu_coroutine_enter(r->co, NULL);
+            ret = 0;
+        }
+    }
+    return ret;
+}
+
+static bool blkdebug_debug_is_suspended(BlockDriverState *bs, const char *tag)
+{
+    BDRVBlkdebugState *s = bs->opaque;
+    BlkdebugSuspendedReq *r;
+
+    QLIST_FOREACH(r, &s->suspended_reqs, next) {
+        if (!strcmp(r->tag, tag)) {
+            return true;
+        }
+    }
+    return false;
+}
+
+static int64_t blkdebug_getlength(BlockDriverState *bs)
+{
+    return bdrv_getlength(bs->file);
+}
+
+static int blkdebug_truncate(BlockDriverState *bs, int64_t offset)
+{
+    return bdrv_truncate(bs->file, offset);
+}
+
+static void blkdebug_refresh_filename(BlockDriverState *bs)
+{
+    QDict *opts;
+    const QDictEntry *e;
+    bool force_json = false;
+
+    for (e = qdict_first(bs->options); e; e = qdict_next(bs->options, e)) {
+        if (strcmp(qdict_entry_key(e), "config") &&
+            strcmp(qdict_entry_key(e), "x-image") &&
+            strcmp(qdict_entry_key(e), "image") &&
+            strncmp(qdict_entry_key(e), "image.", strlen("image.")))
+        {
+            force_json = true;
+            break;
+        }
+    }
+
+    if (force_json && !bs->file->full_open_options) {
+        /* The config file cannot be recreated, so creating a plain filename
+         * is impossible */
+        return;
+    }
+
+    if (!force_json && bs->file->exact_filename[0]) {
+        snprintf(bs->exact_filename, sizeof(bs->exact_filename),
+                 "blkdebug:%s:%s",
+                 qdict_get_try_str(bs->options, "config") ?: "",
+                 bs->file->exact_filename);
+    }
+
+    opts = qdict_new();
+    qdict_put_obj(opts, "driver", QOBJECT(qstring_from_str("blkdebug")));
+
+    QINCREF(bs->file->full_open_options);
+    qdict_put_obj(opts, "image", QOBJECT(bs->file->full_open_options));
+
+    for (e = qdict_first(bs->options); e; e = qdict_next(bs->options, e)) {
+        if (strcmp(qdict_entry_key(e), "x-image") &&
+            strcmp(qdict_entry_key(e), "image") &&
+            strncmp(qdict_entry_key(e), "image.", strlen("image.")))
+        {
+            qobject_incref(qdict_entry_value(e));
+            qdict_put_obj(opts, qdict_entry_key(e), qdict_entry_value(e));
+        }
+    }
+
+    bs->full_open_options = opts;
+}
+
+static BlockDriver bdrv_blkdebug = {
+    .format_name            = "blkdebug",
+    .protocol_name          = "blkdebug",
+    .instance_size          = sizeof(BDRVBlkdebugState),
+
+    .bdrv_parse_filename    = blkdebug_parse_filename,
+    .bdrv_file_open         = blkdebug_open,
+    .bdrv_close             = blkdebug_close,
+    .bdrv_getlength         = blkdebug_getlength,
+    .bdrv_truncate          = blkdebug_truncate,
+    .bdrv_refresh_filename  = blkdebug_refresh_filename,
+
+    .bdrv_aio_readv         = blkdebug_aio_readv,
+    .bdrv_aio_writev        = blkdebug_aio_writev,
+    .bdrv_aio_flush         = blkdebug_aio_flush,
+
+    .bdrv_debug_event           = blkdebug_debug_event,
+    .bdrv_debug_breakpoint      = blkdebug_debug_breakpoint,
+    .bdrv_debug_remove_breakpoint
+                                = blkdebug_debug_remove_breakpoint,
+    .bdrv_debug_resume          = blkdebug_debug_resume,
+    .bdrv_debug_is_suspended    = blkdebug_debug_is_suspended,
+};
+
+static void bdrv_blkdebug_init(void)
+{
+    bdrv_register(&bdrv_blkdebug);
+}
+
+block_init(bdrv_blkdebug_init);