diff options
Diffstat (limited to 'block')
| -rw-r--r-- | block/blkdebug.c | 250 |
1 files changed, 249 insertions, 1 deletions
diff --git a/block/blkdebug.c b/block/blkdebug.c index dad3ac6e91..b813bfad57 100644 --- a/block/blkdebug.c +++ b/block/blkdebug.c @@ -46,6 +46,7 @@ typedef struct BlkdebugVars { typedef struct BDRVBlkdebugState { BlockDriverState *hd; BlkdebugVars vars; + QLIST_HEAD(list, BlkdebugRule) rules[BLKDBG_EVENT_MAX]; } BDRVBlkdebugState; typedef struct BlkdebugAIOCB { @@ -61,16 +62,211 @@ static AIOPool blkdebug_aio_pool = { .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(inject_error_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] = { +}; + +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 = qemu_mallocz(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: + 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; + + /* Open the backing file */ + ret = bdrv_file_open(&s->hd, filename, flags); + if (ret < 0) { + return ret; + } + + return 0; } static void error_callback_bh(void *opaque) @@ -146,6 +342,16 @@ static BlockDriverAIOCB *blkdebug_aio_writev(BlockDriverState *bs, 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) { + QLIST_REMOVE(rule, next); + qemu_free(rule); + } + } + bdrv_delete(s->hd); } @@ -162,6 +368,46 @@ static BlockDriverAIOCB *blkdebug_aio_flush(BlockDriverState *bs, return bdrv_aio_flush(s->hd, cb, opaque); } +static void process_rule(BlockDriverState *bs, struct BlkdebugRule *rule, + BlkdebugVars *old_vars) +{ + BDRVBlkdebugState *s = bs->opaque; + 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 void blkdebug_debug_event(BlockDriverState *bs, BlkDebugEvent event) +{ + BDRVBlkdebugState *s = bs->opaque; + struct BlkdebugRule *rule; + BlkdebugVars old_vars = s->vars; + + if (event < 0 || event >= BLKDBG_EVENT_MAX) { + return; + } + + QLIST_FOREACH(rule, &s->rules[event], next) { + process_rule(bs, rule, &old_vars); + } +} + static BlockDriver bdrv_blkdebug = { .format_name = "blkdebug", .protocol_name = "blkdebug", @@ -175,6 +421,8 @@ static BlockDriver bdrv_blkdebug = { .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) |