2 * Block protocol for I/O error injection
4 * Copyright (C) 2016-2017 Red Hat, Inc.
5 * Copyright (c) 2010 Kevin Wolf <kwolf@redhat.com>
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
26 #include "qemu/osdep.h"
27 #include "qapi/error.h"
28 #include "qemu/cutils.h"
29 #include "qemu/config-file.h"
30 #include "block/block-io.h"
31 #include "block/block_int.h"
32 #include "block/qdict.h"
33 #include "qemu/module.h"
34 #include "qemu/option.h"
35 #include "qapi/qapi-visit-block-core.h"
36 #include "qapi/qmp/qdict.h"
37 #include "qapi/qmp/qlist.h"
38 #include "qapi/qmp/qstring.h"
39 #include "qapi/qobject-input-visitor.h"
40 #include "sysemu/qtest.h"
42 /* All APIs are thread-safe */
44 typedef struct BDRVBlkdebugState {
45 /* IN: initialized in blkdebug_open() and never changed */
47 uint64_t max_transfer;
48 uint64_t opt_write_zero;
49 uint64_t max_write_zero;
52 char *config_file; /* For blkdebug_refresh_filename() */
53 /* initialized in blkdebug_parse_perms() */
54 uint64_t take_child_perms;
55 uint64_t unshare_child_perms;
57 /* State. Protected by lock */
59 QLIST_HEAD(, BlkdebugRule) rules[BLKDBG__MAX];
60 QSIMPLEQ_HEAD(, BlkdebugRule) active_rules;
61 QLIST_HEAD(, BlkdebugSuspendedReq) suspended_reqs;
65 typedef struct BlkdebugAIOCB {
70 typedef struct BlkdebugSuspendedReq {
71 /* IN: initialized in suspend_request() */
75 /* List entry protected BDRVBlkdebugState's lock */
76 QLIST_ENTRY(BlkdebugSuspendedReq) next;
77 } BlkdebugSuspendedReq;
86 typedef struct BlkdebugRule {
87 /* IN: initialized in add_rule() or blkdebug_debug_breakpoint() */
107 /* List entries protected BDRVBlkdebugState's lock */
108 QLIST_ENTRY(BlkdebugRule) next;
109 QSIMPLEQ_ENTRY(BlkdebugRule) active_next;
112 QEMU_BUILD_BUG_MSG(BLKDEBUG_IO_TYPE__MAX > 64,
113 "BlkdebugIOType mask does not fit into an uint64_t");
115 static QemuOptsList inject_error_opts = {
116 .name = "inject-error",
117 .head = QTAILQ_HEAD_INITIALIZER(inject_error_opts.head),
121 .type = QEMU_OPT_STRING,
125 .type = QEMU_OPT_NUMBER,
129 .type = QEMU_OPT_STRING,
133 .type = QEMU_OPT_NUMBER,
137 .type = QEMU_OPT_NUMBER,
141 .type = QEMU_OPT_BOOL,
144 .name = "immediately",
145 .type = QEMU_OPT_BOOL,
147 { /* end of list */ }
151 static QemuOptsList set_state_opts = {
153 .head = QTAILQ_HEAD_INITIALIZER(set_state_opts.head),
157 .type = QEMU_OPT_STRING,
161 .type = QEMU_OPT_NUMBER,
165 .type = QEMU_OPT_NUMBER,
167 { /* end of list */ }
171 static QemuOptsList *config_groups[] = {
177 struct add_rule_data {
178 BDRVBlkdebugState *s;
182 static int add_rule(void *opaque, QemuOpts *opts, Error **errp)
184 struct add_rule_data *d = opaque;
185 BDRVBlkdebugState *s = d->s;
186 const char *event_name;
188 struct BlkdebugRule *rule;
190 BlkdebugIOType iotype;
191 Error *local_error = NULL;
193 /* Find the right event for the rule */
194 event_name = qemu_opt_get(opts, "event");
196 error_setg(errp, "Missing event name for rule");
199 event = qapi_enum_parse(&BlkdebugEvent_lookup, event_name, -1, errp);
204 /* Set attributes common for all actions */
205 rule = g_malloc0(sizeof(*rule));
206 *rule = (struct BlkdebugRule) {
209 .state = qemu_opt_get_number(opts, "state", 0),
212 /* Parse action-specific options */
214 case ACTION_INJECT_ERROR:
215 rule->options.inject.error = qemu_opt_get_number(opts, "errno", EIO);
216 rule->options.inject.once = qemu_opt_get_bool(opts, "once", 0);
217 rule->options.inject.immediately =
218 qemu_opt_get_bool(opts, "immediately", 0);
219 sector = qemu_opt_get_number(opts, "sector", -1);
220 rule->options.inject.offset =
221 sector == -1 ? -1 : sector * BDRV_SECTOR_SIZE;
223 iotype = qapi_enum_parse(&BlkdebugIOType_lookup,
224 qemu_opt_get(opts, "iotype"),
225 BLKDEBUG_IO_TYPE__MAX, &local_error);
227 error_propagate(errp, local_error);
231 if (iotype != BLKDEBUG_IO_TYPE__MAX) {
232 rule->options.inject.iotype_mask = (1ull << iotype);
234 /* Apply the default */
235 rule->options.inject.iotype_mask =
236 (1ull << BLKDEBUG_IO_TYPE_READ)
237 | (1ull << BLKDEBUG_IO_TYPE_WRITE)
238 | (1ull << BLKDEBUG_IO_TYPE_WRITE_ZEROES)
239 | (1ull << BLKDEBUG_IO_TYPE_DISCARD)
240 | (1ull << BLKDEBUG_IO_TYPE_FLUSH);
245 case ACTION_SET_STATE:
246 rule->options.set_state.new_state =
247 qemu_opt_get_number(opts, "new_state", 0);
251 rule->options.suspend.tag =
252 g_strdup(qemu_opt_get(opts, "tag"));
257 qemu_mutex_lock(&s->lock);
258 QLIST_INSERT_HEAD(&s->rules[event], rule, next);
259 qemu_mutex_unlock(&s->lock);
264 /* Called with lock held or from .bdrv_close */
265 static void remove_rule(BlkdebugRule *rule)
267 switch (rule->action) {
268 case ACTION_INJECT_ERROR:
269 case ACTION_SET_STATE:
272 g_free(rule->options.suspend.tag);
276 QLIST_REMOVE(rule, next);
280 static int read_config(BDRVBlkdebugState *s, const char *filename,
281 QDict *options, Error **errp)
285 struct add_rule_data d;
286 Error *local_err = NULL;
289 f = fopen(filename, "r");
291 error_setg_errno(errp, errno, "Could not read blkdebug config file");
295 ret = qemu_config_parse(f, config_groups, filename, errp);
301 if (!qemu_config_parse_qdict(options, config_groups, errp)) {
307 d.action = ACTION_INJECT_ERROR;
308 qemu_opts_foreach(&inject_error_opts, add_rule, &d, &local_err);
310 error_propagate(errp, local_err);
315 d.action = ACTION_SET_STATE;
316 qemu_opts_foreach(&set_state_opts, add_rule, &d, &local_err);
318 error_propagate(errp, local_err);
325 qemu_opts_reset(&inject_error_opts);
326 qemu_opts_reset(&set_state_opts);
333 /* Valid blkdebug filenames look like blkdebug:path/to/config:path/to/image */
334 static void blkdebug_parse_filename(const char *filename, QDict *options,
339 /* Parse the blkdebug: prefix */
340 if (!strstart(filename, "blkdebug:", &filename)) {
341 /* There was no prefix; therefore, all options have to be already
342 present in the QDict (except for the filename) */
343 qdict_put_str(options, "x-image", filename);
347 /* Parse config file path */
348 c = strchr(filename, ':');
350 error_setg(errp, "blkdebug requires both config file and image path");
355 QString *config_path;
356 config_path = qstring_from_substr(filename, 0, c - filename);
357 qdict_put(options, "config", config_path);
360 /* TODO Allow multi-level nesting and set file.filename here */
362 qdict_put_str(options, "x-image", filename);
365 static int blkdebug_parse_perm_list(uint64_t *dest, QDict *options,
366 const char *prefix, Error **errp)
369 QDict *subqdict = NULL;
370 QObject *crumpled_subqdict = NULL;
372 BlockPermissionList *perm_list = NULL, *element;
376 qdict_extract_subqdict(options, &subqdict, prefix);
377 if (!qdict_size(subqdict)) {
381 crumpled_subqdict = qdict_crumple(subqdict, errp);
382 if (!crumpled_subqdict) {
387 v = qobject_input_visitor_new(crumpled_subqdict);
388 if (!visit_type_BlockPermissionList(v, NULL, &perm_list, errp)) {
393 for (element = perm_list; element; element = element->next) {
394 *dest |= bdrv_qapi_perm_to_blk_perm(element->value);
398 qapi_free_BlockPermissionList(perm_list);
400 qobject_unref(subqdict);
401 qobject_unref(crumpled_subqdict);
405 static int blkdebug_parse_perms(BDRVBlkdebugState *s, QDict *options,
410 ret = blkdebug_parse_perm_list(&s->take_child_perms, options,
411 "take-child-perms.", errp);
416 ret = blkdebug_parse_perm_list(&s->unshare_child_perms, options,
417 "unshare-child-perms.", errp);
425 static QemuOptsList runtime_opts = {
427 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
431 .type = QEMU_OPT_STRING,
432 .help = "Path to the configuration file",
436 .type = QEMU_OPT_STRING,
437 .help = "[internal use only, will be removed]",
441 .type = QEMU_OPT_SIZE,
442 .help = "Required alignment in bytes",
445 .name = "max-transfer",
446 .type = QEMU_OPT_SIZE,
447 .help = "Maximum transfer size in bytes",
450 .name = "opt-write-zero",
451 .type = QEMU_OPT_SIZE,
452 .help = "Optimum write zero alignment in bytes",
455 .name = "max-write-zero",
456 .type = QEMU_OPT_SIZE,
457 .help = "Maximum write zero size in bytes",
460 .name = "opt-discard",
461 .type = QEMU_OPT_SIZE,
462 .help = "Optimum discard alignment in bytes",
465 .name = "max-discard",
466 .type = QEMU_OPT_SIZE,
467 .help = "Maximum discard size in bytes",
469 { /* end of list */ }
473 static int blkdebug_open(BlockDriverState *bs, QDict *options, int flags,
476 BDRVBlkdebugState *s = bs->opaque;
481 qemu_mutex_init(&s->lock);
482 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
483 if (!qemu_opts_absorb_qdict(opts, options, errp)) {
488 /* Read rules from config file or command line options */
489 s->config_file = g_strdup(qemu_opt_get(opts, "config"));
490 ret = read_config(s, s->config_file, options, errp);
495 /* Set initial state */
498 /* Parse permissions modifiers before opening the image file */
499 ret = blkdebug_parse_perms(s, options, errp);
504 /* Open the image file */
505 ret = bdrv_open_file_child(qemu_opt_get(opts, "x-image"), options, "image",
511 bs->supported_write_flags = BDRV_REQ_WRITE_UNCHANGED |
512 (BDRV_REQ_FUA & bs->file->bs->supported_write_flags);
513 bs->supported_zero_flags = BDRV_REQ_WRITE_UNCHANGED |
514 ((BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK) &
515 bs->file->bs->supported_zero_flags);
518 /* Set alignment overrides */
519 s->align = qemu_opt_get_size(opts, "align", 0);
520 if (s->align && (s->align >= INT_MAX || !is_power_of_2(s->align))) {
521 error_setg(errp, "Cannot meet constraints with align %" PRIu64,
525 align = MAX(s->align, bs->file->bs->bl.request_alignment);
527 s->max_transfer = qemu_opt_get_size(opts, "max-transfer", 0);
528 if (s->max_transfer &&
529 (s->max_transfer >= INT_MAX ||
530 !QEMU_IS_ALIGNED(s->max_transfer, align))) {
531 error_setg(errp, "Cannot meet constraints with max-transfer %" PRIu64,
536 s->opt_write_zero = qemu_opt_get_size(opts, "opt-write-zero", 0);
537 if (s->opt_write_zero &&
538 (s->opt_write_zero >= INT_MAX ||
539 !QEMU_IS_ALIGNED(s->opt_write_zero, align))) {
540 error_setg(errp, "Cannot meet constraints with opt-write-zero %" PRIu64,
545 s->max_write_zero = qemu_opt_get_size(opts, "max-write-zero", 0);
546 if (s->max_write_zero &&
547 (s->max_write_zero >= INT_MAX ||
548 !QEMU_IS_ALIGNED(s->max_write_zero,
549 MAX(s->opt_write_zero, align)))) {
550 error_setg(errp, "Cannot meet constraints with max-write-zero %" PRIu64,
555 s->opt_discard = qemu_opt_get_size(opts, "opt-discard", 0);
556 if (s->opt_discard &&
557 (s->opt_discard >= INT_MAX ||
558 !QEMU_IS_ALIGNED(s->opt_discard, align))) {
559 error_setg(errp, "Cannot meet constraints with opt-discard %" PRIu64,
564 s->max_discard = qemu_opt_get_size(opts, "max-discard", 0);
565 if (s->max_discard &&
566 (s->max_discard >= INT_MAX ||
567 !QEMU_IS_ALIGNED(s->max_discard,
568 MAX(s->opt_discard, align)))) {
569 error_setg(errp, "Cannot meet constraints with max-discard %" PRIu64,
574 bdrv_debug_event(bs, BLKDBG_NONE);
579 qemu_mutex_destroy(&s->lock);
580 g_free(s->config_file);
586 static int coroutine_fn rule_check(BlockDriverState *bs, uint64_t offset,
587 uint64_t bytes, BlkdebugIOType iotype)
589 BDRVBlkdebugState *s = bs->opaque;
590 BlkdebugRule *rule = NULL;
594 qemu_mutex_lock(&s->lock);
595 QSIMPLEQ_FOREACH(rule, &s->active_rules, active_next) {
596 uint64_t inject_offset = rule->options.inject.offset;
598 if ((inject_offset == -1 ||
599 (bytes && inject_offset >= offset &&
600 inject_offset < offset + bytes)) &&
601 (rule->options.inject.iotype_mask & (1ull << iotype)))
607 if (!rule || !rule->options.inject.error) {
608 qemu_mutex_unlock(&s->lock);
612 immediately = rule->options.inject.immediately;
613 error = rule->options.inject.error;
615 if (rule->options.inject.once) {
616 QSIMPLEQ_REMOVE(&s->active_rules, rule, BlkdebugRule, active_next);
620 qemu_mutex_unlock(&s->lock);
622 aio_co_schedule(qemu_get_current_aio_context(), qemu_coroutine_self());
623 qemu_coroutine_yield();
629 static int coroutine_fn GRAPH_RDLOCK
630 blkdebug_co_preadv(BlockDriverState *bs, int64_t offset, int64_t bytes,
631 QEMUIOVector *qiov, BdrvRequestFlags flags)
635 /* Sanity check block layer guarantees */
636 assert(QEMU_IS_ALIGNED(offset, bs->bl.request_alignment));
637 assert(QEMU_IS_ALIGNED(bytes, bs->bl.request_alignment));
638 if (bs->bl.max_transfer) {
639 assert(bytes <= bs->bl.max_transfer);
642 err = rule_check(bs, offset, bytes, BLKDEBUG_IO_TYPE_READ);
647 return bdrv_co_preadv(bs->file, offset, bytes, qiov, flags);
650 static int coroutine_fn GRAPH_RDLOCK
651 blkdebug_co_pwritev(BlockDriverState *bs, int64_t offset, int64_t bytes,
652 QEMUIOVector *qiov, BdrvRequestFlags flags)
656 /* Sanity check block layer guarantees */
657 assert(QEMU_IS_ALIGNED(offset, bs->bl.request_alignment));
658 assert(QEMU_IS_ALIGNED(bytes, bs->bl.request_alignment));
659 if (bs->bl.max_transfer) {
660 assert(bytes <= bs->bl.max_transfer);
663 err = rule_check(bs, offset, bytes, BLKDEBUG_IO_TYPE_WRITE);
668 return bdrv_co_pwritev(bs->file, offset, bytes, qiov, flags);
671 static int GRAPH_RDLOCK coroutine_fn blkdebug_co_flush(BlockDriverState *bs)
673 int err = rule_check(bs, 0, 0, BLKDEBUG_IO_TYPE_FLUSH);
679 return bdrv_co_flush(bs->file->bs);
682 static int coroutine_fn GRAPH_RDLOCK
683 blkdebug_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, int64_t bytes,
684 BdrvRequestFlags flags)
686 uint32_t align = MAX(bs->bl.request_alignment,
687 bs->bl.pwrite_zeroes_alignment);
690 /* Only pass through requests that are larger than requested
691 * preferred alignment (so that we test the fallback to writes on
692 * unaligned portions), and check that the block layer never hands
693 * us anything unaligned that crosses an alignment boundary. */
695 assert(QEMU_IS_ALIGNED(offset, align) ||
696 QEMU_IS_ALIGNED(offset + bytes, align) ||
697 DIV_ROUND_UP(offset, align) ==
698 DIV_ROUND_UP(offset + bytes, align));
701 assert(QEMU_IS_ALIGNED(offset, align));
702 assert(QEMU_IS_ALIGNED(bytes, align));
703 if (bs->bl.max_pwrite_zeroes) {
704 assert(bytes <= bs->bl.max_pwrite_zeroes);
707 err = rule_check(bs, offset, bytes, BLKDEBUG_IO_TYPE_WRITE_ZEROES);
712 return bdrv_co_pwrite_zeroes(bs->file, offset, bytes, flags);
715 static int coroutine_fn GRAPH_RDLOCK
716 blkdebug_co_pdiscard(BlockDriverState *bs, int64_t offset, int64_t bytes)
718 uint32_t align = bs->bl.pdiscard_alignment;
721 /* Only pass through requests that are larger than requested
722 * minimum alignment, and ensure that unaligned requests do not
723 * cross optimum discard boundaries. */
724 if (bytes < bs->bl.request_alignment) {
725 assert(QEMU_IS_ALIGNED(offset, align) ||
726 QEMU_IS_ALIGNED(offset + bytes, align) ||
727 DIV_ROUND_UP(offset, align) ==
728 DIV_ROUND_UP(offset + bytes, align));
731 assert(QEMU_IS_ALIGNED(offset, bs->bl.request_alignment));
732 assert(QEMU_IS_ALIGNED(bytes, bs->bl.request_alignment));
733 if (align && bytes >= align) {
734 assert(QEMU_IS_ALIGNED(offset, align));
735 assert(QEMU_IS_ALIGNED(bytes, align));
737 if (bs->bl.max_pdiscard) {
738 assert(bytes <= bs->bl.max_pdiscard);
741 err = rule_check(bs, offset, bytes, BLKDEBUG_IO_TYPE_DISCARD);
746 return bdrv_co_pdiscard(bs->file, offset, bytes);
749 static int coroutine_fn blkdebug_co_block_status(BlockDriverState *bs,
755 BlockDriverState **file)
759 assert(QEMU_IS_ALIGNED(offset | bytes, bs->bl.request_alignment));
761 err = rule_check(bs, offset, bytes, BLKDEBUG_IO_TYPE_BLOCK_STATUS);
766 assert(bs->file && bs->file->bs);
769 *file = bs->file->bs;
770 return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID;
773 static void blkdebug_close(BlockDriverState *bs)
775 BDRVBlkdebugState *s = bs->opaque;
776 BlkdebugRule *rule, *next;
779 for (i = 0; i < BLKDBG__MAX; i++) {
780 QLIST_FOREACH_SAFE(rule, &s->rules[i], next, next) {
785 g_free(s->config_file);
786 qemu_mutex_destroy(&s->lock);
789 /* Called with lock held. */
790 static void suspend_request(BlockDriverState *bs, BlkdebugRule *rule)
792 BDRVBlkdebugState *s = bs->opaque;
793 BlkdebugSuspendedReq *r;
795 r = g_new(BlkdebugSuspendedReq, 1);
797 r->co = qemu_coroutine_self();
798 r->tag = g_strdup(rule->options.suspend.tag);
801 QLIST_INSERT_HEAD(&s->suspended_reqs, r, next);
803 if (!qtest_enabled()) {
804 printf("blkdebug: Suspended request '%s'\n", r->tag);
808 /* Called with lock held. */
809 static void process_rule(BlockDriverState *bs, struct BlkdebugRule *rule,
810 int *action_count, int *new_state)
812 BDRVBlkdebugState *s = bs->opaque;
814 /* Only process rules for the current state */
815 if (rule->state && rule->state != s->state) {
819 /* Take the action */
820 action_count[rule->action]++;
821 switch (rule->action) {
822 case ACTION_INJECT_ERROR:
823 if (action_count[ACTION_INJECT_ERROR] == 1) {
824 QSIMPLEQ_INIT(&s->active_rules);
826 QSIMPLEQ_INSERT_HEAD(&s->active_rules, rule, active_next);
829 case ACTION_SET_STATE:
830 *new_state = rule->options.set_state.new_state;
834 suspend_request(bs, rule);
839 static void coroutine_fn
840 blkdebug_co_debug_event(BlockDriverState *bs, BlkdebugEvent event)
842 BDRVBlkdebugState *s = bs->opaque;
843 struct BlkdebugRule *rule, *next;
845 int actions_count[ACTION__MAX] = { 0 };
847 assert((int)event >= 0 && event < BLKDBG__MAX);
849 WITH_QEMU_LOCK_GUARD(&s->lock) {
850 new_state = s->state;
851 QLIST_FOREACH_SAFE(rule, &s->rules[event], next, next) {
852 process_rule(bs, rule, actions_count, &new_state);
854 s->state = new_state;
857 while (actions_count[ACTION_SUSPEND] > 0) {
858 qemu_coroutine_yield();
859 actions_count[ACTION_SUSPEND]--;
863 static int blkdebug_debug_breakpoint(BlockDriverState *bs, const char *event,
866 BDRVBlkdebugState *s = bs->opaque;
867 struct BlkdebugRule *rule;
870 blkdebug_event = qapi_enum_parse(&BlkdebugEvent_lookup, event, -1, NULL);
871 if (blkdebug_event < 0) {
875 rule = g_malloc(sizeof(*rule));
876 *rule = (struct BlkdebugRule) {
877 .event = blkdebug_event,
878 .action = ACTION_SUSPEND,
880 .options.suspend.tag = g_strdup(tag),
883 qemu_mutex_lock(&s->lock);
884 QLIST_INSERT_HEAD(&s->rules[blkdebug_event], rule, next);
885 qemu_mutex_unlock(&s->lock);
890 /* Called with lock held. May temporarily release lock. */
891 static int resume_req_by_tag(BDRVBlkdebugState *s, const char *tag, bool all)
893 BlkdebugSuspendedReq *r;
897 * No need for _SAFE, since a different coroutine can remove another node
898 * (not the current one) in this list, and when the current one is removed
899 * the iteration starts back from beginning anyways.
901 QLIST_FOREACH(r, &s->suspended_reqs, next) {
902 if (!strcmp(r->tag, tag)) {
903 Coroutine *co = r->co;
905 if (!qtest_enabled()) {
906 printf("blkdebug: Resuming request '%s'\n", r->tag);
909 QLIST_REMOVE(r, next);
913 qemu_mutex_unlock(&s->lock);
914 qemu_coroutine_enter(co);
915 qemu_mutex_lock(&s->lock);
926 static int blkdebug_debug_resume(BlockDriverState *bs, const char *tag)
928 BDRVBlkdebugState *s = bs->opaque;
929 QEMU_LOCK_GUARD(&s->lock);
930 return resume_req_by_tag(s, tag, false);
933 static int blkdebug_debug_remove_breakpoint(BlockDriverState *bs,
936 BDRVBlkdebugState *s = bs->opaque;
937 BlkdebugRule *rule, *next;
938 int i, ret = -ENOENT;
940 QEMU_LOCK_GUARD(&s->lock);
941 for (i = 0; i < BLKDBG__MAX; i++) {
942 QLIST_FOREACH_SAFE(rule, &s->rules[i], next, next) {
943 if (rule->action == ACTION_SUSPEND &&
944 !strcmp(rule->options.suspend.tag, tag)) {
950 if (resume_req_by_tag(s, tag, true) == 0) {
956 static bool blkdebug_debug_is_suspended(BlockDriverState *bs, const char *tag)
958 BDRVBlkdebugState *s = bs->opaque;
959 BlkdebugSuspendedReq *r;
961 QEMU_LOCK_GUARD(&s->lock);
962 QLIST_FOREACH(r, &s->suspended_reqs, next) {
963 if (!strcmp(r->tag, tag)) {
970 static int64_t coroutine_fn GRAPH_RDLOCK
971 blkdebug_co_getlength(BlockDriverState *bs)
973 return bdrv_co_getlength(bs->file->bs);
976 static void blkdebug_refresh_filename(BlockDriverState *bs)
978 BDRVBlkdebugState *s = bs->opaque;
982 if (!bs->file->bs->exact_filename[0]) {
986 for (e = qdict_first(bs->full_open_options); e;
987 e = qdict_next(bs->full_open_options, e))
989 /* Real child options are under "image", but "x-image" may
990 * contain a filename */
991 if (strcmp(qdict_entry_key(e), "config") &&
992 strcmp(qdict_entry_key(e), "image") &&
993 strcmp(qdict_entry_key(e), "x-image") &&
994 strcmp(qdict_entry_key(e), "driver"))
1000 ret = snprintf(bs->exact_filename, sizeof(bs->exact_filename),
1002 s->config_file ?: "", bs->file->bs->exact_filename);
1003 if (ret >= sizeof(bs->exact_filename)) {
1004 /* An overflow makes the filename unusable, so do not report any */
1005 bs->exact_filename[0] = 0;
1009 static void blkdebug_refresh_limits(BlockDriverState *bs, Error **errp)
1011 BDRVBlkdebugState *s = bs->opaque;
1014 bs->bl.request_alignment = s->align;
1016 if (s->max_transfer) {
1017 bs->bl.max_transfer = s->max_transfer;
1019 if (s->opt_write_zero) {
1020 bs->bl.pwrite_zeroes_alignment = s->opt_write_zero;
1022 if (s->max_write_zero) {
1023 bs->bl.max_pwrite_zeroes = s->max_write_zero;
1025 if (s->opt_discard) {
1026 bs->bl.pdiscard_alignment = s->opt_discard;
1028 if (s->max_discard) {
1029 bs->bl.max_pdiscard = s->max_discard;
1033 static int blkdebug_reopen_prepare(BDRVReopenState *reopen_state,
1034 BlockReopenQueue *queue, Error **errp)
1039 static void blkdebug_child_perm(BlockDriverState *bs, BdrvChild *c,
1041 BlockReopenQueue *reopen_queue,
1042 uint64_t perm, uint64_t shared,
1043 uint64_t *nperm, uint64_t *nshared)
1045 BDRVBlkdebugState *s = bs->opaque;
1047 bdrv_default_perms(bs, c, role, reopen_queue,
1048 perm, shared, nperm, nshared);
1050 *nperm |= s->take_child_perms;
1051 *nshared &= ~s->unshare_child_perms;
1054 static const char *const blkdebug_strong_runtime_opts[] = {
1068 static BlockDriver bdrv_blkdebug = {
1069 .format_name = "blkdebug",
1070 .protocol_name = "blkdebug",
1071 .instance_size = sizeof(BDRVBlkdebugState),
1074 .bdrv_parse_filename = blkdebug_parse_filename,
1075 .bdrv_file_open = blkdebug_open,
1076 .bdrv_close = blkdebug_close,
1077 .bdrv_reopen_prepare = blkdebug_reopen_prepare,
1078 .bdrv_child_perm = blkdebug_child_perm,
1080 .bdrv_co_getlength = blkdebug_co_getlength,
1081 .bdrv_refresh_filename = blkdebug_refresh_filename,
1082 .bdrv_refresh_limits = blkdebug_refresh_limits,
1084 .bdrv_co_preadv = blkdebug_co_preadv,
1085 .bdrv_co_pwritev = blkdebug_co_pwritev,
1086 .bdrv_co_flush_to_disk = blkdebug_co_flush,
1087 .bdrv_co_pwrite_zeroes = blkdebug_co_pwrite_zeroes,
1088 .bdrv_co_pdiscard = blkdebug_co_pdiscard,
1089 .bdrv_co_block_status = blkdebug_co_block_status,
1091 .bdrv_co_debug_event = blkdebug_co_debug_event,
1092 .bdrv_debug_breakpoint = blkdebug_debug_breakpoint,
1093 .bdrv_debug_remove_breakpoint
1094 = blkdebug_debug_remove_breakpoint,
1095 .bdrv_debug_resume = blkdebug_debug_resume,
1096 .bdrv_debug_is_suspended = blkdebug_debug_is_suspended,
1098 .strong_runtime_opts = blkdebug_strong_runtime_opts,
1101 static void bdrv_blkdebug_init(void)
1103 bdrv_register(&bdrv_blkdebug);
1106 block_init(bdrv_blkdebug_init);