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7ea37c3066
For block drivers that just pass a truncate request to the underlying protocol, we can now pass the preallocation mode instead of aborting if it is not PREALLOC_MODE_OFF. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: 20170613202107.10125-3-mreitz@redhat.com Signed-off-by: Max Reitz <mreitz@redhat.com>
945 lines
26 KiB
C
945 lines
26 KiB
C
/*
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* Block protocol for I/O error injection
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*
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* Copyright (C) 2016-2017 Red Hat, Inc.
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* Copyright (c) 2010 Kevin Wolf <kwolf@redhat.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "qemu/cutils.h"
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#include "qemu/config-file.h"
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#include "block/block_int.h"
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#include "qemu/module.h"
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#include "qapi/qmp/qbool.h"
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#include "qapi/qmp/qdict.h"
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#include "qapi/qmp/qstring.h"
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#include "sysemu/qtest.h"
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typedef struct BDRVBlkdebugState {
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int state;
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int new_state;
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uint64_t align;
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uint64_t max_transfer;
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uint64_t opt_write_zero;
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uint64_t max_write_zero;
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uint64_t opt_discard;
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uint64_t max_discard;
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/* For blkdebug_refresh_filename() */
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char *config_file;
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QLIST_HEAD(, BlkdebugRule) rules[BLKDBG__MAX];
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QSIMPLEQ_HEAD(, BlkdebugRule) active_rules;
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QLIST_HEAD(, BlkdebugSuspendedReq) suspended_reqs;
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} BDRVBlkdebugState;
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typedef struct BlkdebugAIOCB {
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BlockAIOCB common;
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int ret;
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} BlkdebugAIOCB;
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typedef struct BlkdebugSuspendedReq {
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Coroutine *co;
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char *tag;
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QLIST_ENTRY(BlkdebugSuspendedReq) next;
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} BlkdebugSuspendedReq;
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enum {
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ACTION_INJECT_ERROR,
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ACTION_SET_STATE,
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ACTION_SUSPEND,
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};
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typedef struct BlkdebugRule {
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BlkdebugEvent event;
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int action;
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int state;
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union {
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struct {
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int error;
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int immediately;
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int once;
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int64_t offset;
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} inject;
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struct {
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int new_state;
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} set_state;
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struct {
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char *tag;
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} suspend;
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} options;
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QLIST_ENTRY(BlkdebugRule) next;
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QSIMPLEQ_ENTRY(BlkdebugRule) active_next;
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} BlkdebugRule;
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static QemuOptsList inject_error_opts = {
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.name = "inject-error",
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.head = QTAILQ_HEAD_INITIALIZER(inject_error_opts.head),
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.desc = {
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{
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.name = "event",
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.type = QEMU_OPT_STRING,
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},
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{
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.name = "state",
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.type = QEMU_OPT_NUMBER,
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},
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{
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.name = "errno",
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.type = QEMU_OPT_NUMBER,
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},
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{
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.name = "sector",
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.type = QEMU_OPT_NUMBER,
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},
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{
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.name = "once",
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.type = QEMU_OPT_BOOL,
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},
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{
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.name = "immediately",
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.type = QEMU_OPT_BOOL,
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},
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{ /* end of list */ }
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},
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};
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static QemuOptsList set_state_opts = {
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.name = "set-state",
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.head = QTAILQ_HEAD_INITIALIZER(set_state_opts.head),
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.desc = {
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{
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.name = "event",
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.type = QEMU_OPT_STRING,
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},
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{
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.name = "state",
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.type = QEMU_OPT_NUMBER,
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},
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{
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.name = "new_state",
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.type = QEMU_OPT_NUMBER,
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},
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{ /* end of list */ }
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},
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};
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static QemuOptsList *config_groups[] = {
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&inject_error_opts,
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&set_state_opts,
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NULL
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};
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static int get_event_by_name(const char *name, BlkdebugEvent *event)
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{
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int i;
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for (i = 0; i < BLKDBG__MAX; i++) {
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if (!strcmp(BlkdebugEvent_lookup[i], name)) {
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*event = i;
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return 0;
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}
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}
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return -1;
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}
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struct add_rule_data {
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BDRVBlkdebugState *s;
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int action;
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};
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static int add_rule(void *opaque, QemuOpts *opts, Error **errp)
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{
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struct add_rule_data *d = opaque;
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BDRVBlkdebugState *s = d->s;
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const char* event_name;
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BlkdebugEvent event;
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struct BlkdebugRule *rule;
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int64_t sector;
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/* Find the right event for the rule */
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event_name = qemu_opt_get(opts, "event");
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if (!event_name) {
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error_setg(errp, "Missing event name for rule");
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return -1;
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} else if (get_event_by_name(event_name, &event) < 0) {
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error_setg(errp, "Invalid event name \"%s\"", event_name);
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return -1;
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}
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/* Set attributes common for all actions */
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rule = g_malloc0(sizeof(*rule));
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*rule = (struct BlkdebugRule) {
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.event = event,
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.action = d->action,
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.state = qemu_opt_get_number(opts, "state", 0),
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};
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/* Parse action-specific options */
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switch (d->action) {
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case ACTION_INJECT_ERROR:
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rule->options.inject.error = qemu_opt_get_number(opts, "errno", EIO);
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rule->options.inject.once = qemu_opt_get_bool(opts, "once", 0);
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rule->options.inject.immediately =
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qemu_opt_get_bool(opts, "immediately", 0);
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sector = qemu_opt_get_number(opts, "sector", -1);
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rule->options.inject.offset =
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sector == -1 ? -1 : sector * BDRV_SECTOR_SIZE;
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break;
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case ACTION_SET_STATE:
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rule->options.set_state.new_state =
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qemu_opt_get_number(opts, "new_state", 0);
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break;
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case ACTION_SUSPEND:
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rule->options.suspend.tag =
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g_strdup(qemu_opt_get(opts, "tag"));
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break;
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};
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/* Add the rule */
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QLIST_INSERT_HEAD(&s->rules[event], rule, next);
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return 0;
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}
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static void remove_rule(BlkdebugRule *rule)
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{
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switch (rule->action) {
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case ACTION_INJECT_ERROR:
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case ACTION_SET_STATE:
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break;
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case ACTION_SUSPEND:
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g_free(rule->options.suspend.tag);
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break;
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}
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QLIST_REMOVE(rule, next);
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g_free(rule);
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}
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static int read_config(BDRVBlkdebugState *s, const char *filename,
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QDict *options, Error **errp)
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{
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FILE *f = NULL;
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int ret;
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struct add_rule_data d;
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Error *local_err = NULL;
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if (filename) {
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f = fopen(filename, "r");
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if (f == NULL) {
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error_setg_errno(errp, errno, "Could not read blkdebug config file");
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return -errno;
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}
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ret = qemu_config_parse(f, config_groups, filename);
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if (ret < 0) {
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error_setg(errp, "Could not parse blkdebug config file");
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ret = -EINVAL;
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goto fail;
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}
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}
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qemu_config_parse_qdict(options, config_groups, &local_err);
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if (local_err) {
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error_propagate(errp, local_err);
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ret = -EINVAL;
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goto fail;
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}
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d.s = s;
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d.action = ACTION_INJECT_ERROR;
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qemu_opts_foreach(&inject_error_opts, add_rule, &d, &local_err);
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if (local_err) {
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error_propagate(errp, local_err);
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ret = -EINVAL;
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goto fail;
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}
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d.action = ACTION_SET_STATE;
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qemu_opts_foreach(&set_state_opts, add_rule, &d, &local_err);
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if (local_err) {
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error_propagate(errp, local_err);
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ret = -EINVAL;
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goto fail;
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}
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ret = 0;
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fail:
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qemu_opts_reset(&inject_error_opts);
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qemu_opts_reset(&set_state_opts);
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if (f) {
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fclose(f);
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}
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return ret;
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}
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/* Valid blkdebug filenames look like blkdebug:path/to/config:path/to/image */
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static void blkdebug_parse_filename(const char *filename, QDict *options,
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Error **errp)
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{
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const char *c;
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/* Parse the blkdebug: prefix */
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if (!strstart(filename, "blkdebug:", &filename)) {
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/* There was no prefix; therefore, all options have to be already
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present in the QDict (except for the filename) */
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qdict_put_str(options, "x-image", filename);
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return;
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}
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/* Parse config file path */
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c = strchr(filename, ':');
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if (c == NULL) {
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error_setg(errp, "blkdebug requires both config file and image path");
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return;
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}
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if (c != filename) {
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QString *config_path;
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config_path = qstring_from_substr(filename, 0, c - filename - 1);
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qdict_put(options, "config", config_path);
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}
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/* TODO Allow multi-level nesting and set file.filename here */
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filename = c + 1;
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qdict_put_str(options, "x-image", filename);
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}
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static QemuOptsList runtime_opts = {
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.name = "blkdebug",
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.head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
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.desc = {
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{
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.name = "config",
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.type = QEMU_OPT_STRING,
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.help = "Path to the configuration file",
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},
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{
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.name = "x-image",
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.type = QEMU_OPT_STRING,
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.help = "[internal use only, will be removed]",
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},
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{
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.name = "align",
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.type = QEMU_OPT_SIZE,
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.help = "Required alignment in bytes",
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},
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{
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.name = "max-transfer",
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.type = QEMU_OPT_SIZE,
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.help = "Maximum transfer size in bytes",
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},
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{
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.name = "opt-write-zero",
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.type = QEMU_OPT_SIZE,
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.help = "Optimum write zero alignment in bytes",
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},
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{
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.name = "max-write-zero",
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.type = QEMU_OPT_SIZE,
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.help = "Maximum write zero size in bytes",
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},
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{
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.name = "opt-discard",
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.type = QEMU_OPT_SIZE,
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.help = "Optimum discard alignment in bytes",
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},
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{
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.name = "max-discard",
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.type = QEMU_OPT_SIZE,
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.help = "Maximum discard size in bytes",
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},
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{ /* end of list */ }
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},
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};
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static int blkdebug_open(BlockDriverState *bs, QDict *options, int flags,
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Error **errp)
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{
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BDRVBlkdebugState *s = bs->opaque;
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QemuOpts *opts;
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Error *local_err = NULL;
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int ret;
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uint64_t align;
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opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
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qemu_opts_absorb_qdict(opts, options, &local_err);
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if (local_err) {
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error_propagate(errp, local_err);
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ret = -EINVAL;
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goto out;
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}
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|
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/* Read rules from config file or command line options */
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s->config_file = g_strdup(qemu_opt_get(opts, "config"));
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ret = read_config(s, s->config_file, options, errp);
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if (ret) {
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goto out;
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}
|
|
|
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/* Set initial state */
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s->state = 1;
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|
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/* Open the image file */
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bs->file = bdrv_open_child(qemu_opt_get(opts, "x-image"), options, "image",
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bs, &child_file, false, &local_err);
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if (local_err) {
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ret = -EINVAL;
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error_propagate(errp, local_err);
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goto out;
|
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}
|
|
|
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bs->supported_write_flags = BDRV_REQ_FUA &
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bs->file->bs->supported_write_flags;
|
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bs->supported_zero_flags = (BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP) &
|
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bs->file->bs->supported_zero_flags;
|
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ret = -EINVAL;
|
|
|
|
/* Set alignment overrides */
|
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s->align = qemu_opt_get_size(opts, "align", 0);
|
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if (s->align && (s->align >= INT_MAX || !is_power_of_2(s->align))) {
|
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error_setg(errp, "Cannot meet constraints with align %" PRIu64,
|
|
s->align);
|
|
goto out;
|
|
}
|
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align = MAX(s->align, bs->file->bs->bl.request_alignment);
|
|
|
|
s->max_transfer = qemu_opt_get_size(opts, "max-transfer", 0);
|
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if (s->max_transfer &&
|
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(s->max_transfer >= INT_MAX ||
|
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!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->bs, offset, bytes);
|
|
}
|
|
|
|
static int64_t coroutine_fn blkdebug_co_get_block_status(
|
|
BlockDriverState *bs, int64_t sector_num, int nb_sectors, int *pnum,
|
|
BlockDriverState **file)
|
|
{
|
|
*pnum = nb_sectors;
|
|
*file = bs->file->bs;
|
|
return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID |
|
|
(sector_num << BDRV_SECTOR_BITS);
|
|
}
|
|
|
|
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;
|
|
BlkdebugEvent blkdebug_event;
|
|
|
|
if (get_event_by_name(event, &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 int blkdebug_truncate(BlockDriverState *bs, int64_t offset,
|
|
PreallocMode prealloc, Error **errp)
|
|
{
|
|
return bdrv_truncate(bs->file, offset, prealloc, errp);
|
|
}
|
|
|
|
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");
|
|
|
|
QINCREF(bs->file->bs->full_open_options);
|
|
qdict_put(opts, "image", 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")) {
|
|
qobject_incref(qdict_entry_value(e));
|
|
qdict_put_obj(opts, qdict_entry_key(e), 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),
|
|
|
|
.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_truncate = blkdebug_truncate,
|
|
.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_get_block_status = blkdebug_co_get_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);
|