--- /dev/null
+/*
+ * 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);
Code Review / kvmfornfv.git / blobdiff