state = 0 in rules means that the rule is valid for any state. Therefore it's impossible to have a rule that works only in the initial state. This changes the initial state from 0 to 1 to make this possible. Signed-off-by: Kevin Wolf <kwolf@redhat.com>
474 lines
13 KiB
C
474 lines
13 KiB
C
/*
|
|
* 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 "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 {
|
|
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 = 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:
|
|
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:");
|
|
|
|
/* 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,
|
|
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
|
BlockDriverCompletionFunc *cb, void *opaque)
|
|
{
|
|
BDRVBlkdebugState *s = bs->opaque;
|
|
|
|
if (s->vars.inject_errno) {
|
|
return inject_error(bs, cb, opaque);
|
|
}
|
|
|
|
BlockDriverAIOCB *acb =
|
|
bdrv_aio_readv(bs->file, sector_num, qiov, nb_sectors, cb, opaque);
|
|
return acb;
|
|
}
|
|
|
|
static BlockDriverAIOCB *blkdebug_aio_writev(BlockDriverState *bs,
|
|
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
|
BlockDriverCompletionFunc *cb, void *opaque)
|
|
{
|
|
BDRVBlkdebugState *s = bs->opaque;
|
|
|
|
if (s->vars.inject_errno) {
|
|
return inject_error(bs, cb, opaque);
|
|
}
|
|
|
|
BlockDriverAIOCB *acb =
|
|
bdrv_aio_writev(bs->file, sector_num, qiov, nb_sectors, cb, opaque);
|
|
return acb;
|
|
}
|
|
|
|
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);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void blkdebug_flush(BlockDriverState *bs)
|
|
{
|
|
bdrv_flush(bs->file);
|
|
}
|
|
|
|
static BlockDriverAIOCB *blkdebug_aio_flush(BlockDriverState *bs,
|
|
BlockDriverCompletionFunc *cb, void *opaque)
|
|
{
|
|
return bdrv_aio_flush(bs->file, 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",
|
|
|
|
.instance_size = sizeof(BDRVBlkdebugState),
|
|
|
|
.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)
|
|
{
|
|
bdrv_register(&bdrv_blkdebug);
|
|
}
|
|
|
|
block_init(bdrv_blkdebug_init);
|