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qemu/block/blkdebug.c
Paolo Bonzini 2f1fabdf44 blkdebug: add missing coroutine_fn annotation 
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20230309084456.304669-3-pbonzini@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2023-04-25 13:17:28 +02:00

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/*
* Block protocol for I/O error injection
*
* Copyright (C) 2016-2017 Red Hat, Inc.
* 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/osdep.h"
#include "qapi/error.h"
#include "qemu/cutils.h"
#include "qemu/config-file.h"
#include "block/block-io.h"
#include "block/block_int.h"
#include "block/qdict.h"
#include "qemu/module.h"
#include "qemu/option.h"
#include "qapi/qapi-visit-block-core.h"
#include "qapi/qmp/qdict.h"
#include "qapi/qmp/qlist.h"
#include "qapi/qmp/qstring.h"
#include "qapi/qobject-input-visitor.h"
#include "sysemu/qtest.h"
/* All APIs are thread-safe */
typedef struct BDRVBlkdebugState {
/* IN: initialized in blkdebug_open() and never changed */
uint64_t align;
uint64_t max_transfer;
uint64_t opt_write_zero;
uint64_t max_write_zero;
uint64_t opt_discard;
uint64_t max_discard;
char *config_file; /* For blkdebug_refresh_filename() */
/* initialized in blkdebug_parse_perms() */
uint64_t take_child_perms;
uint64_t unshare_child_perms;
/* State. Protected by lock */
int state;
QLIST_HEAD(, BlkdebugRule) rules[BLKDBG__MAX];
QSIMPLEQ_HEAD(, BlkdebugRule) active_rules;
QLIST_HEAD(, BlkdebugSuspendedReq) suspended_reqs;
QemuMutex lock;
} BDRVBlkdebugState;
typedef struct BlkdebugAIOCB {
BlockAIOCB common;
int ret;
} BlkdebugAIOCB;
typedef struct BlkdebugSuspendedReq {
/* IN: initialized in suspend_request() */
Coroutine *co;
char *tag;
/* List entry protected BDRVBlkdebugState's lock */
QLIST_ENTRY(BlkdebugSuspendedReq) next;
} BlkdebugSuspendedReq;
enum {
ACTION_INJECT_ERROR,
ACTION_SET_STATE,
ACTION_SUSPEND,
ACTION__MAX,
};
typedef struct BlkdebugRule {
/* IN: initialized in add_rule() or blkdebug_debug_breakpoint() */
BlkdebugEvent event;
int action;
int state;
union {
struct {
uint64_t iotype_mask;
int error;
int immediately;
int once;
int64_t offset;
} inject;
struct {
int new_state;
} set_state;
struct {
char *tag;
} suspend;
} options;
/* List entries protected BDRVBlkdebugState's lock */
QLIST_ENTRY(BlkdebugRule) next;
QSIMPLEQ_ENTRY(BlkdebugRule) active_next;
} BlkdebugRule;
QEMU_BUILD_BUG_MSG(BLKDEBUG_IO_TYPE__MAX > 64,
"BlkdebugIOType mask does not fit into an uint64_t");
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 = "iotype",
.type = QEMU_OPT_STRING,
},
{
.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
};
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;
int event;
struct BlkdebugRule *rule;
int64_t sector;
BlkdebugIOType iotype;
Error *local_error = NULL;
/* 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;
}
event = qapi_enum_parse(&BlkdebugEvent_lookup, event_name, -1, errp);
if (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);
sector = qemu_opt_get_number(opts, "sector", -1);
rule->options.inject.offset =
sector == -1 ? -1 : sector * BDRV_SECTOR_SIZE;
iotype = qapi_enum_parse(&BlkdebugIOType_lookup,
qemu_opt_get(opts, "iotype"),
BLKDEBUG_IO_TYPE__MAX, &local_error);
if (local_error) {
error_propagate(errp, local_error);
g_free(rule);
return -1;
}
if (iotype != BLKDEBUG_IO_TYPE__MAX) {
rule->options.inject.iotype_mask = (1ull << iotype);
} else {
/* Apply the default */
rule->options.inject.iotype_mask =
(1ull << BLKDEBUG_IO_TYPE_READ)
| (1ull << BLKDEBUG_IO_TYPE_WRITE)
| (1ull << BLKDEBUG_IO_TYPE_WRITE_ZEROES)
| (1ull << BLKDEBUG_IO_TYPE_DISCARD)
| (1ull << BLKDEBUG_IO_TYPE_FLUSH);
}
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 */
qemu_mutex_lock(&s->lock);
QLIST_INSERT_HEAD(&s->rules[event], rule, next);
qemu_mutex_unlock(&s->lock);
return 0;
}
/* Called with lock held or from .bdrv_close */
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, errp);
if (ret < 0) {
goto fail;
}
}
if (!qemu_config_parse_qdict(options, config_groups, errp)) {
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_str(options, "x-image", 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);
qdict_put(options, "config", config_path);
}
/* TODO Allow multi-level nesting and set file.filename here */
filename = c + 1;
qdict_put_str(options, "x-image", filename);
}
static int blkdebug_parse_perm_list(uint64_t *dest, QDict *options,
const char *prefix, Error **errp)
{
int ret = 0;
QDict *subqdict = NULL;
QObject *crumpled_subqdict = NULL;
Visitor *v = NULL;
BlockPermissionList *perm_list = NULL, *element;
*dest = 0;
qdict_extract_subqdict(options, &subqdict, prefix);
if (!qdict_size(subqdict)) {
goto out;
}
crumpled_subqdict = qdict_crumple(subqdict, errp);
if (!crumpled_subqdict) {
ret = -EINVAL;
goto out;
}
v = qobject_input_visitor_new(crumpled_subqdict);
if (!visit_type_BlockPermissionList(v, NULL, &perm_list, errp)) {
ret = -EINVAL;
goto out;
}
for (element = perm_list; element; element = element->next) {
*dest |= bdrv_qapi_perm_to_blk_perm(element->value);
}
out:
qapi_free_BlockPermissionList(perm_list);
visit_free(v);
qobject_unref(subqdict);
qobject_unref(crumpled_subqdict);
return ret;
}
static int blkdebug_parse_perms(BDRVBlkdebugState *s, QDict *options,
Error **errp)
{
int ret;
ret = blkdebug_parse_perm_list(&s->take_child_perms, options,
"take-child-perms.", errp);
if (ret < 0) {
return ret;
}
ret = blkdebug_parse_perm_list(&s->unshare_child_perms, options,
"unshare-child-perms.", errp);
if (ret < 0) {
return ret;
}
return 0;
}
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",
},
{
.name = "max-transfer",
.type = QEMU_OPT_SIZE,
.help = "Maximum transfer size in bytes",
},
{
.name = "opt-write-zero",
.type = QEMU_OPT_SIZE,
.help = "Optimum write zero alignment in bytes",
},
{
.name = "max-write-zero",
.type = QEMU_OPT_SIZE,
.help = "Maximum write zero size in bytes",
},
{
.name = "opt-discard",
.type = QEMU_OPT_SIZE,
.help = "Optimum discard alignment in bytes",
},
{
.name = "max-discard",
.type = QEMU_OPT_SIZE,
.help = "Maximum discard size in bytes",
},
{ /* end of list */ }
},
};
static int blkdebug_open(BlockDriverState *bs, QDict *options, int flags,
Error **errp)
{
BDRVBlkdebugState *s = bs->opaque;
QemuOpts *opts;
int ret;
uint64_t align;
qemu_mutex_init(&s->lock);
opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
if (!qemu_opts_absorb_qdict(opts, options, errp)) {
ret = -EINVAL;
goto out;
}
/* Read rules from config file or command line options */
s->config_file = g_strdup(qemu_opt_get(opts, "config"));
ret = read_config(s, s->config_file, options, errp);
if (ret) {
goto out;
}
/* Set initial state */
s->state = 1;
/* Parse permissions modifiers before opening the image file */
ret = blkdebug_parse_perms(s, options, errp);
if (ret < 0) {
goto out;
}
/* Open the image file */
ret = bdrv_open_file_child(qemu_opt_get(opts, "x-image"), options, "image",
bs, errp);
if (ret < 0) {
goto out;
}
bs->supported_write_flags = BDRV_REQ_WRITE_UNCHANGED |
(BDRV_REQ_FUA & bs->file->bs->supported_write_flags);
bs->supported_zero_flags = BDRV_REQ_WRITE_UNCHANGED |
((BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK) &
bs->file->bs->supported_zero_flags);
ret = -EINVAL;
/* Set alignment overrides */
s->align = qemu_opt_get_size(opts, "align", 0);
if (s->align && (s->align >= INT_MAX || !is_power_of_2(s->align))) {
error_setg(errp, "Cannot meet constraints with align %" PRIu64,
s->align);
goto out;
}
align = MAX(s->align, bs->file->bs->bl.request_alignment);
s->max_transfer = qemu_opt_get_size(opts, "max-transfer", 0);
if (s->max_transfer &&
(s->max_transfer >= INT_MAX ||
!QEMU_IS_ALIGNED(s->max_transfer, align))) {
error_setg(errp, "Cannot meet constraints with max-transfer %" PRIu64,
s->max_transfer);
goto out;
}
s->opt_write_zero = qemu_opt_get_size(opts, "opt-write-zero", 0);
if (s->opt_write_zero &&
(s->opt_write_zero >= INT_MAX ||
!QEMU_IS_ALIGNED(s->opt_write_zero, align))) {
error_setg(errp, "Cannot meet constraints with opt-write-zero %" PRIu64,
s->opt_write_zero);
goto out;
}
s->max_write_zero = qemu_opt_get_size(opts, "max-write-zero", 0);
if (s->max_write_zero &&
(s->max_write_zero >= INT_MAX ||
!QEMU_IS_ALIGNED(s->max_write_zero,
MAX(s->opt_write_zero, align)))) {
error_setg(errp, "Cannot meet constraints with max-write-zero %" PRIu64,
s->max_write_zero);
goto out;
}
s->opt_discard = qemu_opt_get_size(opts, "opt-discard", 0);
if (s->opt_discard &&
(s->opt_discard >= INT_MAX ||
!QEMU_IS_ALIGNED(s->opt_discard, align))) {
error_setg(errp, "Cannot meet constraints with opt-discard %" PRIu64,
s->opt_discard);
goto out;
}
s->max_discard = qemu_opt_get_size(opts, "max-discard", 0);
if (s->max_discard &&
(s->max_discard >= INT_MAX ||
!QEMU_IS_ALIGNED(s->max_discard,
MAX(s->opt_discard, align)))) {
error_setg(errp, "Cannot meet constraints with max-discard %" PRIu64,
s->max_discard);
goto out;
}
bdrv_debug_event(bs, BLKDBG_NONE);
ret = 0;
out:
if (ret < 0) {
qemu_mutex_destroy(&s->lock);
g_free(s->config_file);
}
qemu_opts_del(opts);
return ret;
}
static int coroutine_fn rule_check(BlockDriverState *bs, uint64_t offset,
uint64_t bytes, BlkdebugIOType iotype)
{
BDRVBlkdebugState *s = bs->opaque;
BlkdebugRule *rule = NULL;
int error;
bool immediately;
qemu_mutex_lock(&s->lock);
QSIMPLEQ_FOREACH(rule, &s->active_rules, active_next) {
uint64_t inject_offset = rule->options.inject.offset;
if ((inject_offset == -1 ||
(bytes && inject_offset >= offset &&
inject_offset < offset + bytes)) &&
(rule->options.inject.iotype_mask & (1ull << iotype)))
{
break;
}
}
if (!rule || !rule->options.inject.error) {
qemu_mutex_unlock(&s->lock);
return 0;
}
immediately = rule->options.inject.immediately;
error = rule->options.inject.error;
if (rule->options.inject.once) {
QSIMPLEQ_REMOVE(&s->active_rules, rule, BlkdebugRule, active_next);
remove_rule(rule);
}
qemu_mutex_unlock(&s->lock);
if (!immediately) {
aio_co_schedule(qemu_get_current_aio_context(), qemu_coroutine_self());
qemu_coroutine_yield();
}
return -error;
}
static int coroutine_fn GRAPH_RDLOCK
blkdebug_co_preadv(BlockDriverState *bs, int64_t offset, int64_t bytes,
QEMUIOVector *qiov, BdrvRequestFlags flags)
{
int err;
/* Sanity check block layer guarantees */
assert(QEMU_IS_ALIGNED(offset, bs->bl.request_alignment));
assert(QEMU_IS_ALIGNED(bytes, bs->bl.request_alignment));
if (bs->bl.max_transfer) {
assert(bytes <= bs->bl.max_transfer);
}
err = rule_check(bs, offset, bytes, BLKDEBUG_IO_TYPE_READ);
if (err) {
return err;
}
return bdrv_co_preadv(bs->file, offset, bytes, qiov, flags);
}
static int coroutine_fn GRAPH_RDLOCK
blkdebug_co_pwritev(BlockDriverState *bs, int64_t offset, int64_t bytes,
QEMUIOVector *qiov, BdrvRequestFlags flags)
{
int err;
/* Sanity check block layer guarantees */
assert(QEMU_IS_ALIGNED(offset, bs->bl.request_alignment));
assert(QEMU_IS_ALIGNED(bytes, bs->bl.request_alignment));
if (bs->bl.max_transfer) {
assert(bytes <= bs->bl.max_transfer);
}
err = rule_check(bs, offset, bytes, BLKDEBUG_IO_TYPE_WRITE);
if (err) {
return err;
}
return bdrv_co_pwritev(bs->file, offset, bytes, qiov, flags);
}
static int GRAPH_RDLOCK coroutine_fn blkdebug_co_flush(BlockDriverState *bs)
{
int err = rule_check(bs, 0, 0, BLKDEBUG_IO_TYPE_FLUSH);
if (err) {
return err;
}
return bdrv_co_flush(bs->file->bs);
}
static int coroutine_fn GRAPH_RDLOCK
blkdebug_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, int64_t bytes,
BdrvRequestFlags flags)
{
uint32_t align = MAX(bs->bl.request_alignment,
bs->bl.pwrite_zeroes_alignment);
int err;
/* Only pass through requests that are larger than requested
* preferred alignment (so that we test the fallback to writes on
* unaligned portions), and check that the block layer never hands
* us anything unaligned that crosses an alignment boundary. */
if (bytes < align) {
assert(QEMU_IS_ALIGNED(offset, align) ||
QEMU_IS_ALIGNED(offset + bytes, align) ||
DIV_ROUND_UP(offset, align) ==
DIV_ROUND_UP(offset + bytes, align));
return -ENOTSUP;
}
assert(QEMU_IS_ALIGNED(offset, align));
assert(QEMU_IS_ALIGNED(bytes, align));
if (bs->bl.max_pwrite_zeroes) {
assert(bytes <= bs->bl.max_pwrite_zeroes);
}
err = rule_check(bs, offset, bytes, BLKDEBUG_IO_TYPE_WRITE_ZEROES);
if (err) {
return err;
}
return bdrv_co_pwrite_zeroes(bs->file, offset, bytes, flags);
}
static int coroutine_fn GRAPH_RDLOCK
blkdebug_co_pdiscard(BlockDriverState *bs, int64_t offset, int64_t bytes)
{
uint32_t align = bs->bl.pdiscard_alignment;
int err;
/* Only pass through requests that are larger than requested
* minimum alignment, and ensure that unaligned requests do not
* cross optimum discard boundaries. */
if (bytes < bs->bl.request_alignment) {
assert(QEMU_IS_ALIGNED(offset, align) ||
QEMU_IS_ALIGNED(offset + bytes, align) ||
DIV_ROUND_UP(offset, align) ==
DIV_ROUND_UP(offset + bytes, align));
return -ENOTSUP;
}
assert(QEMU_IS_ALIGNED(offset, bs->bl.request_alignment));
assert(QEMU_IS_ALIGNED(bytes, bs->bl.request_alignment));
if (align && bytes >= align) {
assert(QEMU_IS_ALIGNED(offset, align));
assert(QEMU_IS_ALIGNED(bytes, align));
}
if (bs->bl.max_pdiscard) {
assert(bytes <= bs->bl.max_pdiscard);
}
err = rule_check(bs, offset, bytes, BLKDEBUG_IO_TYPE_DISCARD);
if (err) {
return err;
}
return bdrv_co_pdiscard(bs->file, offset, bytes);
}
static int coroutine_fn blkdebug_co_block_status(BlockDriverState *bs,
bool want_zero,
int64_t offset,
int64_t bytes,
int64_t *pnum,
int64_t *map,
BlockDriverState **file)
{
int err;
assert(QEMU_IS_ALIGNED(offset | bytes, bs->bl.request_alignment));
err = rule_check(bs, offset, bytes, BLKDEBUG_IO_TYPE_BLOCK_STATUS);
if (err) {
return err;
}
assert(bs->file && bs->file->bs);
*pnum = bytes;
*map = offset;
*file = bs->file->bs;
return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID;
}
static void blkdebug_close(BlockDriverState *bs)
{
BDRVBlkdebugState *s = bs->opaque;
BlkdebugRule *rule, *next;
int i;
for (i = 0; i < BLKDBG__MAX; i++) {
QLIST_FOREACH_SAFE(rule, &s->rules[i], next, next) {
remove_rule(rule);
}
}
g_free(s->config_file);
qemu_mutex_destroy(&s->lock);
}
/* Called with lock held. */
static void suspend_request(BlockDriverState *bs, BlkdebugRule *rule)
{
BDRVBlkdebugState *s = bs->opaque;
BlkdebugSuspendedReq *r;
r = g_new(BlkdebugSuspendedReq, 1);
r->co = qemu_coroutine_self();
r->tag = g_strdup(rule->options.suspend.tag);
remove_rule(rule);
QLIST_INSERT_HEAD(&s->suspended_reqs, r, next);
if (!qtest_enabled()) {
printf("blkdebug: Suspended request '%s'\n", r->tag);
}
}
/* Called with lock held. */
static void process_rule(BlockDriverState *bs, struct BlkdebugRule *rule,
int *action_count, int *new_state)
{
BDRVBlkdebugState *s = bs->opaque;
/* Only process rules for the current state */
if (rule->state && rule->state != s->state) {
return;
}
/* Take the action */
action_count[rule->action]++;
switch (rule->action) {
case ACTION_INJECT_ERROR:
if (action_count[ACTION_INJECT_ERROR] == 1) {
QSIMPLEQ_INIT(&s->active_rules);
}
QSIMPLEQ_INSERT_HEAD(&s->active_rules, rule, active_next);
break;
case ACTION_SET_STATE:
*new_state = rule->options.set_state.new_state;
break;
case ACTION_SUSPEND:
suspend_request(bs, rule);
break;
}
}
static void coroutine_fn
blkdebug_co_debug_event(BlockDriverState *bs, BlkdebugEvent event)
{
BDRVBlkdebugState *s = bs->opaque;
struct BlkdebugRule *rule, *next;
int new_state;
int actions_count[ACTION__MAX] = { 0 };
assert((int)event >= 0 && event < BLKDBG__MAX);
WITH_QEMU_LOCK_GUARD(&s->lock) {
new_state = s->state;
QLIST_FOREACH_SAFE(rule, &s->rules[event], next, next) {
process_rule(bs, rule, actions_count, &new_state);
}
s->state = new_state;
}
while (actions_count[ACTION_SUSPEND] > 0) {
qemu_coroutine_yield();
actions_count[ACTION_SUSPEND]--;
}
}
static int blkdebug_debug_breakpoint(BlockDriverState *bs, const char *event,
const char *tag)
{
BDRVBlkdebugState *s = bs->opaque;
struct BlkdebugRule *rule;
int blkdebug_event;
blkdebug_event = qapi_enum_parse(&BlkdebugEvent_lookup, event, -1, NULL);
if (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),
};
qemu_mutex_lock(&s->lock);
QLIST_INSERT_HEAD(&s->rules[blkdebug_event], rule, next);
qemu_mutex_unlock(&s->lock);
return 0;
}
/* Called with lock held. May temporarily release lock. */
static int resume_req_by_tag(BDRVBlkdebugState *s, const char *tag, bool all)
{
BlkdebugSuspendedReq *r;
retry:
/*
* No need for _SAFE, since a different coroutine can remove another node
* (not the current one) in this list, and when the current one is removed
* the iteration starts back from beginning anyways.
*/
QLIST_FOREACH(r, &s->suspended_reqs, next) {
if (!strcmp(r->tag, tag)) {
Coroutine *co = r->co;
if (!qtest_enabled()) {
printf("blkdebug: Resuming request '%s'\n", r->tag);
}
QLIST_REMOVE(r, next);
g_free(r->tag);
g_free(r);
qemu_mutex_unlock(&s->lock);
qemu_coroutine_enter(co);
qemu_mutex_lock(&s->lock);
if (all) {
goto retry;
}
return 0;
}
}
return -ENOENT;
}
static int blkdebug_debug_resume(BlockDriverState *bs, const char *tag)
{
BDRVBlkdebugState *s = bs->opaque;
QEMU_LOCK_GUARD(&s->lock);
return resume_req_by_tag(s, tag, false);
}
static int blkdebug_debug_remove_breakpoint(BlockDriverState *bs,
const char *tag)
{
BDRVBlkdebugState *s = bs->opaque;
BlkdebugRule *rule, *next;
int i, ret = -ENOENT;
QEMU_LOCK_GUARD(&s->lock);
for (i = 0; i < BLKDBG__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;
}
}
}
if (resume_req_by_tag(s, tag, true) == 0) {
ret = 0;
}
return ret;
}
static bool blkdebug_debug_is_suspended(BlockDriverState *bs, const char *tag)
{
BDRVBlkdebugState *s = bs->opaque;
BlkdebugSuspendedReq *r;
QEMU_LOCK_GUARD(&s->lock);
QLIST_FOREACH(r, &s->suspended_reqs, next) {
if (!strcmp(r->tag, tag)) {
return true;
}
}
return false;
}
static int64_t coroutine_fn GRAPH_RDLOCK
blkdebug_co_getlength(BlockDriverState *bs)
{
return bdrv_co_getlength(bs->file->bs);
}
static void blkdebug_refresh_filename(BlockDriverState *bs)
{
BDRVBlkdebugState *s = bs->opaque;
const QDictEntry *e;
int ret;
if (!bs->file->bs->exact_filename[0]) {
return;
}
for (e = qdict_first(bs->full_open_options); e;
e = qdict_next(bs->full_open_options, e))
{
/* Real child options are under "image", but "x-image" may
* contain a filename */
if (strcmp(qdict_entry_key(e), "config") &&
strcmp(qdict_entry_key(e), "image") &&
strcmp(qdict_entry_key(e), "x-image") &&
strcmp(qdict_entry_key(e), "driver"))
{
return;
}
}
ret = snprintf(bs->exact_filename, sizeof(bs->exact_filename),
"blkdebug:%s:%s",
s->config_file ?: "", bs->file->bs->exact_filename);
if (ret >= sizeof(bs->exact_filename)) {
/* An overflow makes the filename unusable, so do not report any */
bs->exact_filename[0] = 0;
}
}
static void blkdebug_refresh_limits(BlockDriverState *bs, Error **errp)
{
BDRVBlkdebugState *s = bs->opaque;
if (s->align) {
bs->bl.request_alignment = s->align;
}
if (s->max_transfer) {
bs->bl.max_transfer = s->max_transfer;
}
if (s->opt_write_zero) {
bs->bl.pwrite_zeroes_alignment = s->opt_write_zero;
}
if (s->max_write_zero) {
bs->bl.max_pwrite_zeroes = s->max_write_zero;
}
if (s->opt_discard) {
bs->bl.pdiscard_alignment = s->opt_discard;
}
if (s->max_discard) {
bs->bl.max_pdiscard = s->max_discard;
}
}
static int blkdebug_reopen_prepare(BDRVReopenState *reopen_state,
BlockReopenQueue *queue, Error **errp)
{
return 0;
}
static void blkdebug_child_perm(BlockDriverState *bs, BdrvChild *c,
BdrvChildRole role,
BlockReopenQueue *reopen_queue,
uint64_t perm, uint64_t shared,
uint64_t *nperm, uint64_t *nshared)
{
BDRVBlkdebugState *s = bs->opaque;
bdrv_default_perms(bs, c, role, reopen_queue,
perm, shared, nperm, nshared);
*nperm |= s->take_child_perms;
*nshared &= ~s->unshare_child_perms;
}
static const char *const blkdebug_strong_runtime_opts[] = {
"config",
"inject-error.",
"set-state.",
"align",
"max-transfer",
"opt-write-zero",
"max-write-zero",
"opt-discard",
"max-discard",
NULL
};
static BlockDriver bdrv_blkdebug = {
.format_name = "blkdebug",
.protocol_name = "blkdebug",
.instance_size = sizeof(BDRVBlkdebugState),
.is_filter = true,
.bdrv_parse_filename = blkdebug_parse_filename,
.bdrv_file_open = blkdebug_open,
.bdrv_close = blkdebug_close,
.bdrv_reopen_prepare = blkdebug_reopen_prepare,
.bdrv_child_perm = blkdebug_child_perm,
.bdrv_co_getlength = blkdebug_co_getlength,
.bdrv_refresh_filename = blkdebug_refresh_filename,
.bdrv_refresh_limits = blkdebug_refresh_limits,
.bdrv_co_preadv = blkdebug_co_preadv,
.bdrv_co_pwritev = blkdebug_co_pwritev,
.bdrv_co_flush_to_disk = blkdebug_co_flush,
.bdrv_co_pwrite_zeroes = blkdebug_co_pwrite_zeroes,
.bdrv_co_pdiscard = blkdebug_co_pdiscard,
.bdrv_co_block_status = blkdebug_co_block_status,
.bdrv_co_debug_event = blkdebug_co_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,
.strong_runtime_opts = blkdebug_strong_runtime_opts,
};
static void bdrv_blkdebug_init(void)
{
bdrv_register(&bdrv_blkdebug);
}
block_init(bdrv_blkdebug_init);
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