#include "block_int.h"
#include "module.h"
+typedef struct BlkdebugVars {
+ int state;
+
+ /* If inject_errno != 0, an error is injected for requests */
+ int inject_errno;
+
+ /* Decides if all future requests fail (false) or only the next one and
+ * after the next request inject_errno is reset to 0 (true) */
+ bool inject_once;
+
+ /* Decides if aio_readv/writev fails right away (true) or returns an error
+ * return value only in the callback (false) */
+ bool inject_immediately;
+} BlkdebugVars;
+
typedef struct BDRVBlkdebugState {
- BlockDriverState *hd;
+ BlkdebugVars vars;
+ QLIST_HEAD(list, BlkdebugRule) rules[BLKDBG_EVENT_MAX];
} BDRVBlkdebugState;
+typedef struct BlkdebugAIOCB {
+ BlockDriverAIOCB common;
+ QEMUBH *bh;
+ int ret;
+} BlkdebugAIOCB;
+
+static void blkdebug_aio_cancel(BlockDriverAIOCB *blockacb);
+
+static AIOPool blkdebug_aio_pool = {
+ .aiocb_size = sizeof(BlkdebugAIOCB),
+ .cancel = blkdebug_aio_cancel,
+};
+
+enum {
+ ACTION_INJECT_ERROR,
+ ACTION_SET_STATE,
+};
+
+typedef struct BlkdebugRule {
+ BlkDebugEvent event;
+ int action;
+ int state;
+ union {
+ struct {
+ int error;
+ int immediately;
+ int once;
+ } inject;
+ struct {
+ int new_state;
+ } set_state;
+ } options;
+ QLIST_ENTRY(BlkdebugRule) 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 = "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] = "read",
+ [BLKDBG_READ_AIO] = "read_aio",
+ [BLKDBG_READ_BACKING] = "read_backing",
+ [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_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",
+};
+
+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(QemuOpts *opts, void *opaque)
+{
+ 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 || get_event_by_name(event_name, &event) < 0) {
+ 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);
+ break;
+
+ case ACTION_SET_STATE:
+ rule->options.set_state.new_state =
+ qemu_opt_get_number(opts, "new_state", 0);
+ break;
+ };
+
+ /* Add the rule */
+ QLIST_INSERT_HEAD(&s->rules[event], rule, next);
+
+ return 0;
+}
+
+static int read_config(BDRVBlkdebugState *s, const char *filename)
+{
+ FILE *f;
+ int ret;
+ struct add_rule_data d;
+
+ f = fopen(filename, "r");
+ if (f == NULL) {
+ return -errno;
+ }
+
+ ret = qemu_config_parse(f, config_groups, filename);
+ if (ret < 0) {
+ goto fail;
+ }
+
+ d.s = s;
+ d.action = ACTION_INJECT_ERROR;
+ qemu_opts_foreach(&inject_error_opts, add_rule, &d, 0);
+
+ d.action = ACTION_SET_STATE;
+ qemu_opts_foreach(&set_state_opts, add_rule, &d, 0);
+
+ ret = 0;
+fail:
+ qemu_opts_reset(&inject_error_opts);
+ qemu_opts_reset(&set_state_opts);
+ fclose(f);
+ return ret;
+}
+
+/* Valid blkdebug filenames look like blkdebug:path/to/config:path/to/image */
static int blkdebug_open(BlockDriverState *bs, const char *filename, int flags)
{
BDRVBlkdebugState *s = bs->opaque;
+ int ret;
+ char *config, *c;
+ /* Parse the blkdebug: prefix */
if (strncmp(filename, "blkdebug:", strlen("blkdebug:"))) {
return -EINVAL;
}
filename += strlen("blkdebug:");
- return bdrv_file_open(&s->hd, filename, flags);
+ /* Read rules from config file */
+ c = strchr(filename, ':');
+ if (c == NULL) {
+ return -EINVAL;
+ }
+
+ config = strdup(filename);
+ config[c - filename] = '\0';
+ ret = read_config(s, config);
+ free(config);
+ if (ret < 0) {
+ return ret;
+ }
+ filename = c + 1;
+
+ /* Set initial state */
+ s->vars.state = 1;
+
+ /* Open the backing file */
+ ret = bdrv_file_open(&bs->file, filename, flags);
+ if (ret < 0) {
+ return ret;
+ }
+
+ return 0;
+}
+
+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_release(acb);
+}
+
+static void blkdebug_aio_cancel(BlockDriverAIOCB *blockacb)
+{
+ BlkdebugAIOCB *acb = container_of(blockacb, BlkdebugAIOCB, common);
+ qemu_aio_release(acb);
+}
+
+static BlockDriverAIOCB *inject_error(BlockDriverState *bs,
+ BlockDriverCompletionFunc *cb, void *opaque)
+{
+ BDRVBlkdebugState *s = bs->opaque;
+ int error = s->vars.inject_errno;
+ struct BlkdebugAIOCB *acb;
+ QEMUBH *bh;
+
+ if (s->vars.inject_once) {
+ s->vars.inject_errno = 0;
+ }
+
+ if (s->vars.inject_immediately) {
+ return NULL;
+ }
+
+ acb = qemu_aio_get(&blkdebug_aio_pool, bs, cb, opaque);
+ acb->ret = -error;
+
+ bh = qemu_bh_new(error_callback_bh, acb);
+ acb->bh = bh;
+ qemu_bh_schedule(bh);
+
+ return &acb->common;
}
static BlockDriverAIOCB *blkdebug_aio_readv(BlockDriverState *bs,
BlockDriverCompletionFunc *cb, void *opaque)
{
BDRVBlkdebugState *s = bs->opaque;
+
+ if (s->vars.inject_errno) {
+ return inject_error(bs, cb, opaque);
+ }
+
BlockDriverAIOCB *acb =
- bdrv_aio_readv(s->hd, sector_num, qiov, nb_sectors, cb, opaque);
+ bdrv_aio_readv(bs->file, sector_num, qiov, nb_sectors, cb, opaque);
return acb;
}
BlockDriverCompletionFunc *cb, void *opaque)
{
BDRVBlkdebugState *s = bs->opaque;
+
+ if (s->vars.inject_errno) {
+ return inject_error(bs, cb, opaque);
+ }
+
BlockDriverAIOCB *acb =
- bdrv_aio_writev(s->hd, sector_num, qiov, nb_sectors, cb, opaque);
+ bdrv_aio_writev(bs->file, sector_num, qiov, nb_sectors, cb, opaque);
return acb;
}
static void blkdebug_close(BlockDriverState *bs)
{
BDRVBlkdebugState *s = bs->opaque;
- bdrv_delete(s->hd);
+ BlkdebugRule *rule, *next;
+ int i;
+
+ for (i = 0; i < BLKDBG_EVENT_MAX; i++) {
+ QLIST_FOREACH_SAFE(rule, &s->rules[i], next, next) {
+ QLIST_REMOVE(rule, next);
+ g_free(rule);
+ }
+ }
+}
+
+static BlockDriverAIOCB *blkdebug_aio_flush(BlockDriverState *bs,
+ BlockDriverCompletionFunc *cb, void *opaque)
+{
+ return bdrv_aio_flush(bs->file, cb, opaque);
}
-static void blkdebug_flush(BlockDriverState *bs)
+static void process_rule(BlockDriverState *bs, struct BlkdebugRule *rule,
+ BlkdebugVars *old_vars)
{
BDRVBlkdebugState *s = bs->opaque;
- bdrv_flush(s->hd);
+ BlkdebugVars *vars = &s->vars;
+
+ /* Only process rules for the current state */
+ if (rule->state && rule->state != old_vars->state) {
+ return;
+ }
+
+ /* Take the action */
+ switch (rule->action) {
+ case ACTION_INJECT_ERROR:
+ vars->inject_errno = rule->options.inject.error;
+ vars->inject_once = rule->options.inject.once;
+ vars->inject_immediately = rule->options.inject.immediately;
+ break;
+
+ case ACTION_SET_STATE:
+ vars->state = rule->options.set_state.new_state;
+ break;
+ }
}
-static BlockDriverAIOCB *blkdebug_aio_flush(BlockDriverState *bs,
- BlockDriverCompletionFunc *cb, void *opaque)
+static void blkdebug_debug_event(BlockDriverState *bs, BlkDebugEvent event)
{
BDRVBlkdebugState *s = bs->opaque;
- return bdrv_aio_flush(s->hd, cb, opaque);
+ struct BlkdebugRule *rule;
+ BlkdebugVars old_vars = s->vars;
+
+ assert((int)event >= 0 && event < BLKDBG_EVENT_MAX);
+
+ QLIST_FOREACH(rule, &s->rules[event], next) {
+ process_rule(bs, rule, &old_vars);
+ }
}
static BlockDriver bdrv_blkdebug = {
.instance_size = sizeof(BDRVBlkdebugState),
- .bdrv_open = blkdebug_open,
+ .bdrv_file_open = blkdebug_open,
.bdrv_close = blkdebug_close,
- .bdrv_flush = blkdebug_flush,
.bdrv_aio_readv = blkdebug_aio_readv,
.bdrv_aio_writev = blkdebug_aio_writev,
.bdrv_aio_flush = blkdebug_aio_flush,
+
+ .bdrv_debug_event = blkdebug_debug_event,
};
static void bdrv_blkdebug_init(void)
projects / qemu.git / blobdiff