Other I/O functions are already using a BdrvChild pointer in the API, so make discard do the same. It makes it possible to initiate the same permission checks before doing I/O, and much easier to share the helper functions for this, which will be added and used by write, truncate and copy range paths. Signed-off-by: Fam Zheng <famz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
928 lines
26 KiB
C
928 lines
26 KiB
C
/*
|
|
* 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_int.h"
|
|
#include "qemu/module.h"
|
|
#include "qemu/option.h"
|
|
#include "qapi/qmp/qdict.h"
|
|
#include "qapi/qmp/qstring.h"
|
|
#include "sysemu/qtest.h"
|
|
|
|
typedef struct BDRVBlkdebugState {
|
|
int state;
|
|
int new_state;
|
|
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;
|
|
|
|
/* For blkdebug_refresh_filename() */
|
|
char *config_file;
|
|
|
|
QLIST_HEAD(, BlkdebugRule) rules[BLKDBG__MAX];
|
|
QSIMPLEQ_HEAD(, BlkdebugRule) active_rules;
|
|
QLIST_HEAD(, BlkdebugSuspendedReq) suspended_reqs;
|
|
} BDRVBlkdebugState;
|
|
|
|
typedef struct BlkdebugAIOCB {
|
|
BlockAIOCB common;
|
|
int ret;
|
|
} BlkdebugAIOCB;
|
|
|
|
typedef struct BlkdebugSuspendedReq {
|
|
Coroutine *co;
|
|
char *tag;
|
|
QLIST_ENTRY(BlkdebugSuspendedReq) next;
|
|
} BlkdebugSuspendedReq;
|
|
|
|
enum {
|
|
ACTION_INJECT_ERROR,
|
|
ACTION_SET_STATE,
|
|
ACTION_SUSPEND,
|
|
};
|
|
|
|
typedef struct BlkdebugRule {
|
|
BlkdebugEvent event;
|
|
int action;
|
|
int state;
|
|
union {
|
|
struct {
|
|
int error;
|
|
int immediately;
|
|
int once;
|
|
int64_t offset;
|
|
} inject;
|
|
struct {
|
|
int new_state;
|
|
} set_state;
|
|
struct {
|
|
char *tag;
|
|
} suspend;
|
|
} options;
|
|
QLIST_ENTRY(BlkdebugRule) next;
|
|
QSIMPLEQ_ENTRY(BlkdebugRule) active_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 = "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;
|
|
|
|
/* 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;
|
|
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 */
|
|
QLIST_INSERT_HEAD(&s->rules[event], rule, next);
|
|
|
|
return 0;
|
|
}
|
|
|
|
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);
|
|
if (ret < 0) {
|
|
error_setg(errp, "Could not parse blkdebug config file");
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
qemu_config_parse_qdict(options, config_groups, &local_err);
|
|
if (local_err) {
|
|
error_propagate(errp, local_err);
|
|
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 - 1);
|
|
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 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;
|
|
Error *local_err = NULL;
|
|
int ret;
|
|
uint64_t align;
|
|
|
|
opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
|
|
qemu_opts_absorb_qdict(opts, options, &local_err);
|
|
if (local_err) {
|
|
error_propagate(errp, local_err);
|
|
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;
|
|
|
|
/* Open the image file */
|
|
bs->file = bdrv_open_child(qemu_opt_get(opts, "x-image"), options, "image",
|
|
bs, &child_file, false, &local_err);
|
|
if (local_err) {
|
|
ret = -EINVAL;
|
|
error_propagate(errp, local_err);
|
|
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) &
|
|
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;
|
|
}
|
|
|
|
ret = 0;
|
|
out:
|
|
if (ret < 0) {
|
|
g_free(s->config_file);
|
|
}
|
|
qemu_opts_del(opts);
|
|
return ret;
|
|
}
|
|
|
|
static int rule_check(BlockDriverState *bs, uint64_t offset, uint64_t bytes)
|
|
{
|
|
BDRVBlkdebugState *s = bs->opaque;
|
|
BlkdebugRule *rule = NULL;
|
|
int error;
|
|
bool immediately;
|
|
|
|
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))
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!rule || !rule->options.inject.error) {
|
|
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);
|
|
}
|
|
|
|
if (!immediately) {
|
|
aio_co_schedule(qemu_get_current_aio_context(), qemu_coroutine_self());
|
|
qemu_coroutine_yield();
|
|
}
|
|
|
|
return -error;
|
|
}
|
|
|
|
static int coroutine_fn
|
|
blkdebug_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
|
|
QEMUIOVector *qiov, int 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);
|
|
if (err) {
|
|
return err;
|
|
}
|
|
|
|
return bdrv_co_preadv(bs->file, offset, bytes, qiov, flags);
|
|
}
|
|
|
|
static int coroutine_fn
|
|
blkdebug_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
|
|
QEMUIOVector *qiov, int 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);
|
|
if (err) {
|
|
return err;
|
|
}
|
|
|
|
return bdrv_co_pwritev(bs->file, offset, bytes, qiov, flags);
|
|
}
|
|
|
|
static int blkdebug_co_flush(BlockDriverState *bs)
|
|
{
|
|
int err = rule_check(bs, 0, 0);
|
|
|
|
if (err) {
|
|
return err;
|
|
}
|
|
|
|
return bdrv_co_flush(bs->file->bs);
|
|
}
|
|
|
|
static int coroutine_fn blkdebug_co_pwrite_zeroes(BlockDriverState *bs,
|
|
int64_t offset, int 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);
|
|
if (err) {
|
|
return err;
|
|
}
|
|
|
|
return bdrv_co_pwrite_zeroes(bs->file, offset, bytes, flags);
|
|
}
|
|
|
|
static int coroutine_fn blkdebug_co_pdiscard(BlockDriverState *bs,
|
|
int64_t offset, int 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);
|
|
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)
|
|
{
|
|
assert(QEMU_IS_ALIGNED(offset | bytes, bs->bl.request_alignment));
|
|
return bdrv_co_block_status_from_file(bs, want_zero, offset, bytes,
|
|
pnum, map, file);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
static void suspend_request(BlockDriverState *bs, BlkdebugRule *rule)
|
|
{
|
|
BDRVBlkdebugState *s = bs->opaque;
|
|
BlkdebugSuspendedReq r;
|
|
|
|
r = (BlkdebugSuspendedReq) {
|
|
.co = qemu_coroutine_self(),
|
|
.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);
|
|
}
|
|
qemu_coroutine_yield();
|
|
if (!qtest_enabled()) {
|
|
printf("blkdebug: Resuming request '%s'\n", r.tag);
|
|
}
|
|
|
|
QLIST_REMOVE(&r, next);
|
|
g_free(r.tag);
|
|
}
|
|
|
|
static bool process_rule(BlockDriverState *bs, struct BlkdebugRule *rule,
|
|
bool injected)
|
|
{
|
|
BDRVBlkdebugState *s = bs->opaque;
|
|
|
|
/* Only process rules for the current state */
|
|
if (rule->state && rule->state != s->state) {
|
|
return injected;
|
|
}
|
|
|
|
/* Take the action */
|
|
switch (rule->action) {
|
|
case ACTION_INJECT_ERROR:
|
|
if (!injected) {
|
|
QSIMPLEQ_INIT(&s->active_rules);
|
|
injected = true;
|
|
}
|
|
QSIMPLEQ_INSERT_HEAD(&s->active_rules, rule, active_next);
|
|
break;
|
|
|
|
case ACTION_SET_STATE:
|
|
s->new_state = rule->options.set_state.new_state;
|
|
break;
|
|
|
|
case ACTION_SUSPEND:
|
|
suspend_request(bs, rule);
|
|
break;
|
|
}
|
|
return injected;
|
|
}
|
|
|
|
static void blkdebug_debug_event(BlockDriverState *bs, BlkdebugEvent event)
|
|
{
|
|
BDRVBlkdebugState *s = bs->opaque;
|
|
struct BlkdebugRule *rule, *next;
|
|
bool injected;
|
|
|
|
assert((int)event >= 0 && event < BLKDBG__MAX);
|
|
|
|
injected = false;
|
|
s->new_state = s->state;
|
|
QLIST_FOREACH_SAFE(rule, &s->rules[event], next, next) {
|
|
injected = process_rule(bs, rule, injected);
|
|
}
|
|
s->state = s->new_state;
|
|
}
|
|
|
|
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),
|
|
};
|
|
|
|
QLIST_INSERT_HEAD(&s->rules[blkdebug_event], rule, next);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int blkdebug_debug_resume(BlockDriverState *bs, const char *tag)
|
|
{
|
|
BDRVBlkdebugState *s = bs->opaque;
|
|
BlkdebugSuspendedReq *r, *next;
|
|
|
|
QLIST_FOREACH_SAFE(r, &s->suspended_reqs, next, next) {
|
|
if (!strcmp(r->tag, tag)) {
|
|
qemu_coroutine_enter(r->co);
|
|
return 0;
|
|
}
|
|
}
|
|
return -ENOENT;
|
|
}
|
|
|
|
static int blkdebug_debug_remove_breakpoint(BlockDriverState *bs,
|
|
const char *tag)
|
|
{
|
|
BDRVBlkdebugState *s = bs->opaque;
|
|
BlkdebugSuspendedReq *r, *r_next;
|
|
BlkdebugRule *rule, *next;
|
|
int i, ret = -ENOENT;
|
|
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
QLIST_FOREACH_SAFE(r, &s->suspended_reqs, next, r_next) {
|
|
if (!strcmp(r->tag, tag)) {
|
|
qemu_coroutine_enter(r->co);
|
|
ret = 0;
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static bool blkdebug_debug_is_suspended(BlockDriverState *bs, const char *tag)
|
|
{
|
|
BDRVBlkdebugState *s = bs->opaque;
|
|
BlkdebugSuspendedReq *r;
|
|
|
|
QLIST_FOREACH(r, &s->suspended_reqs, next) {
|
|
if (!strcmp(r->tag, tag)) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static int64_t blkdebug_getlength(BlockDriverState *bs)
|
|
{
|
|
return bdrv_getlength(bs->file->bs);
|
|
}
|
|
|
|
static void blkdebug_refresh_filename(BlockDriverState *bs, QDict *options)
|
|
{
|
|
BDRVBlkdebugState *s = bs->opaque;
|
|
QDict *opts;
|
|
const QDictEntry *e;
|
|
bool force_json = false;
|
|
|
|
for (e = qdict_first(options); e; e = qdict_next(options, e)) {
|
|
if (strcmp(qdict_entry_key(e), "config") &&
|
|
strcmp(qdict_entry_key(e), "x-image"))
|
|
{
|
|
force_json = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (force_json && !bs->file->bs->full_open_options) {
|
|
/* The config file cannot be recreated, so creating a plain filename
|
|
* is impossible */
|
|
return;
|
|
}
|
|
|
|
if (!force_json && bs->file->bs->exact_filename[0]) {
|
|
int 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;
|
|
}
|
|
}
|
|
|
|
opts = qdict_new();
|
|
qdict_put_str(opts, "driver", "blkdebug");
|
|
|
|
qdict_put(opts, "image", qobject_ref(bs->file->bs->full_open_options));
|
|
|
|
for (e = qdict_first(options); e; e = qdict_next(options, e)) {
|
|
if (strcmp(qdict_entry_key(e), "x-image")) {
|
|
qdict_put_obj(opts, qdict_entry_key(e),
|
|
qobject_ref(qdict_entry_value(e)));
|
|
}
|
|
}
|
|
|
|
bs->full_open_options = opts;
|
|
}
|
|
|
|
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 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 = bdrv_filter_default_perms,
|
|
|
|
.bdrv_getlength = blkdebug_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_debug_event = blkdebug_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,
|
|
};
|
|
|
|
static void bdrv_blkdebug_init(void)
|
|
{
|
|
bdrv_register(&bdrv_blkdebug);
|
|
}
|
|
|
|
block_init(bdrv_blkdebug_init);
|