[qemu.git] / blockjob.c

/*
 * QEMU System Emulator block driver
 *
 * Copyright (c) 2011 IBM Corp.
 * Copyright (c) 2012 Red Hat, Inc.
 *
 * 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 "config-host.h"
#include "qemu-common.h"
#include "trace.h"
#include "block/block.h"
#include "block/blockjob.h"
#include "block/block_int.h"
#include "sysemu/block-backend.h"
#include "qapi/qmp/qerror.h"
#include "qapi/qmp/qjson.h"
#include "qemu/coroutine.h"
#include "qmp-commands.h"
#include "qemu/timer.h"
#include "qapi-event.h"

void *block_job_create(const BlockJobDriver *driver, BlockDriverState *bs,
                       int64_t speed, BlockCompletionFunc *cb,
                       void *opaque, Error **errp)
{
    BlockJob *job;

    if (bs->job) {
        error_setg(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
        return NULL;
    }
    bdrv_ref(bs);
    job = g_malloc0(driver->instance_size);
    error_setg(&job->blocker, "block device is in use by block job: %s",
               BlockJobType_lookup[driver->job_type]);
    bdrv_op_block_all(bs, job->blocker);
    bdrv_op_unblock(bs, BLOCK_OP_TYPE_DATAPLANE, job->blocker);

    job->driver        = driver;
    job->id            = g_strdup(bdrv_get_device_name(bs));
    job->bs            = bs;
    job->cb            = cb;
    job->opaque        = opaque;
    job->busy          = true;
    bs->job = job;

    /* Only set speed when necessary to avoid NotSupported error */
    if (speed != 0) {
        Error *local_err = NULL;

        block_job_set_speed(job, speed, &local_err);
        if (local_err) {
            block_job_release(bs);
            error_propagate(errp, local_err);
            return NULL;
        }
    }
    return job;
}

void block_job_release(BlockDriverState *bs)
{
    BlockJob *job = bs->job;

    bs->job = NULL;
    bdrv_op_unblock_all(bs, job->blocker);
    error_free(job->blocker);
    g_free(job->id);
    g_free(job);
}

void block_job_completed(BlockJob *job, int ret)
{
    BlockDriverState *bs = job->bs;

    assert(bs->job == job);
    job->cb(job->opaque, ret);
    block_job_release(bs);
}

void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp)
{
    Error *local_err = NULL;

    if (!job->driver->set_speed) {
        error_setg(errp, QERR_UNSUPPORTED);
        return;
    }
    job->driver->set_speed(job, speed, &local_err);
    if (local_err) {
        error_propagate(errp, local_err);
        return;
    }

    job->speed = speed;
}

void block_job_complete(BlockJob *job, Error **errp)
{
    if (job->pause_count || job->cancelled || !job->driver->complete) {
        error_setg(errp, QERR_BLOCK_JOB_NOT_READY, job->id);
        return;
    }

    job->driver->complete(job, errp);
}

void block_job_pause(BlockJob *job)
{
    job->pause_count++;
}

bool block_job_is_paused(BlockJob *job)
{
    return job->pause_count > 0;
}

void block_job_resume(BlockJob *job)
{
    assert(job->pause_count > 0);
    job->pause_count--;
    if (job->pause_count) {
        return;
    }
    block_job_enter(job);
}

void block_job_enter(BlockJob *job)
{
    block_job_iostatus_reset(job);
    if (job->co && !job->busy) {
        qemu_coroutine_enter(job->co, NULL);
    }
}

void block_job_cancel(BlockJob *job)
{
    job->cancelled = true;
    block_job_enter(job);
}

bool block_job_is_cancelled(BlockJob *job)
{
    return job->cancelled;
}

void block_job_iostatus_reset(BlockJob *job)
{
    job->iostatus = BLOCK_DEVICE_IO_STATUS_OK;
    if (job->driver->iostatus_reset) {
        job->driver->iostatus_reset(job);
    }
}

struct BlockFinishData {
    BlockJob *job;
    BlockCompletionFunc *cb;
    void *opaque;
    bool cancelled;
    int ret;
};

static void block_job_finish_cb(void *opaque, int ret)
{
    struct BlockFinishData *data = opaque;

    data->cancelled = block_job_is_cancelled(data->job);
    data->ret = ret;
    data->cb(data->opaque, ret);
}

static int block_job_finish_sync(BlockJob *job,
                                 void (*finish)(BlockJob *, Error **errp),
                                 Error **errp)
{
    struct BlockFinishData data;
    BlockDriverState *bs = job->bs;
    Error *local_err = NULL;

    assert(bs->job == job);

    /* Set up our own callback to store the result and chain to
     * the original callback.
     */
    data.job = job;
    data.cb = job->cb;
    data.opaque = job->opaque;
    data.ret = -EINPROGRESS;
    job->cb = block_job_finish_cb;
    job->opaque = &data;
    finish(job, &local_err);
    if (local_err) {
        error_propagate(errp, local_err);
        return -EBUSY;
    }
    while (data.ret == -EINPROGRESS) {
        aio_poll(bdrv_get_aio_context(bs), true);
    }
    return (data.cancelled && data.ret == 0) ? -ECANCELED : data.ret;
}

/* A wrapper around block_job_cancel() taking an Error ** parameter so it may be
 * used with block_job_finish_sync() without the need for (rather nasty)
 * function pointer casts there. */
static void block_job_cancel_err(BlockJob *job, Error **errp)
{
    block_job_cancel(job);
}

int block_job_cancel_sync(BlockJob *job)
{
    return block_job_finish_sync(job, &block_job_cancel_err, NULL);
}

int block_job_complete_sync(BlockJob *job, Error **errp)
{
    return block_job_finish_sync(job, &block_job_complete, errp);
}

void block_job_sleep_ns(BlockJob *job, QEMUClockType type, int64_t ns)
{
    assert(job->busy);

    /* Check cancellation *before* setting busy = false, too!  */
    if (block_job_is_cancelled(job)) {
        return;
    }

    job->busy = false;
    if (block_job_is_paused(job)) {
        qemu_coroutine_yield();
    } else {
        co_aio_sleep_ns(bdrv_get_aio_context(job->bs), type, ns);
    }
    job->busy = true;
}

void block_job_yield(BlockJob *job)
{
    assert(job->busy);

    /* Check cancellation *before* setting busy = false, too!  */
    if (block_job_is_cancelled(job)) {
        return;
    }

    job->busy = false;
    qemu_coroutine_yield();
    job->busy = true;
}

BlockJobInfo *block_job_query(BlockJob *job)
{
    BlockJobInfo *info = g_new0(BlockJobInfo, 1);
    info->type      = g_strdup(BlockJobType_lookup[job->driver->job_type]);
    info->device    = g_strdup(job->id);
    info->len       = job->len;
    info->busy      = job->busy;
    info->paused    = job->pause_count > 0;
    info->offset    = job->offset;
    info->speed     = job->speed;
    info->io_status = job->iostatus;
    info->ready     = job->ready;
    return info;
}

static void block_job_iostatus_set_err(BlockJob *job, int error)
{
    if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) {
        job->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE :
                                          BLOCK_DEVICE_IO_STATUS_FAILED;
    }
}

void block_job_event_cancelled(BlockJob *job)
{
    qapi_event_send_block_job_cancelled(job->driver->job_type,
                                        job->id,
                                        job->len,
                                        job->offset,
                                        job->speed,
                                        &error_abort);
}

void block_job_event_completed(BlockJob *job, const char *msg)
{
    qapi_event_send_block_job_completed(job->driver->job_type,
                                        job->id,
                                        job->len,
                                        job->offset,
                                        job->speed,
                                        !!msg,
                                        msg,
                                        &error_abort);
}

void block_job_event_ready(BlockJob *job)
{
    job->ready = true;

    qapi_event_send_block_job_ready(job->driver->job_type,
                                    job->id,
                                    job->len,
                                    job->offset,
                                    job->speed, &error_abort);
}

BlockErrorAction block_job_error_action(BlockJob *job, BlockDriverState *bs,
                                        BlockdevOnError on_err,
                                        int is_read, int error)
{
    BlockErrorAction action;

    switch (on_err) {
    case BLOCKDEV_ON_ERROR_ENOSPC:
        action = (error == ENOSPC) ?
                 BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT;
        break;
    case BLOCKDEV_ON_ERROR_STOP:
        action = BLOCK_ERROR_ACTION_STOP;
        break;
    case BLOCKDEV_ON_ERROR_REPORT:
        action = BLOCK_ERROR_ACTION_REPORT;
        break;
    case BLOCKDEV_ON_ERROR_IGNORE:
        action = BLOCK_ERROR_ACTION_IGNORE;
        break;
    default:
        abort();
    }
    qapi_event_send_block_job_error(job->id,
                                    is_read ? IO_OPERATION_TYPE_READ :
                                    IO_OPERATION_TYPE_WRITE,
                                    action, &error_abort);
    if (action == BLOCK_ERROR_ACTION_STOP) {
        /* make the pause user visible, which will be resumed from QMP. */
        job->user_paused = true;
        block_job_pause(job);
        block_job_iostatus_set_err(job, error);
        if (bs->blk && bs != job->bs) {
            blk_iostatus_set_err(bs->blk, error);
        }
    }
    return action;
}

typedef struct {
    BlockJob *job;
    QEMUBH *bh;
    AioContext *aio_context;
    BlockJobDeferToMainLoopFn *fn;
    void *opaque;
} BlockJobDeferToMainLoopData;

static void block_job_defer_to_main_loop_bh(void *opaque)
{
    BlockJobDeferToMainLoopData *data = opaque;
    AioContext *aio_context;

    qemu_bh_delete(data->bh);

    /* Prevent race with block_job_defer_to_main_loop() */
    aio_context_acquire(data->aio_context);

    /* Fetch BDS AioContext again, in case it has changed */
    aio_context = bdrv_get_aio_context(data->job->bs);
    aio_context_acquire(aio_context);

    data->fn(data->job, data->opaque);

    aio_context_release(aio_context);

    aio_context_release(data->aio_context);

    g_free(data);
}

void block_job_defer_to_main_loop(BlockJob *job,
                                  BlockJobDeferToMainLoopFn *fn,
                                  void *opaque)
{
    BlockJobDeferToMainLoopData *data = g_malloc(sizeof(*data));
    data->job = job;
    data->bh = qemu_bh_new(block_job_defer_to_main_loop_bh, data);
    data->aio_context = bdrv_get_aio_context(job->bs);
    data->fn = fn;
    data->opaque = opaque;

    qemu_bh_schedule(data->bh);
}
Commit	Line	Data
2f0c9fe6 PB	1	/*
	2	* QEMU System Emulator block driver
	3	*
	4	* Copyright (c) 2011 IBM Corp.
	5	* Copyright (c) 2012 Red Hat, Inc.
	6	*
	7	* Permission is hereby granted, free of charge, to any person obtaining a copy
	8	* of this software and associated documentation files (the "Software"), to deal
	9	* in the Software without restriction, including without limitation the rights
	10	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	11	* copies of the Software, and to permit persons to whom the Software is
	12	* furnished to do so, subject to the following conditions:
	13	*
	14	* The above copyright notice and this permission notice shall be included in
	15	* all copies or substantial portions of the Software.
	16	*
	17	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	18	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	19	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	20	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	21	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	22	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	23	* THE SOFTWARE.
	24	*/
	25
	26	#include "config-host.h"
	27	#include "qemu-common.h"
	28	#include "trace.h"
737e150e PB	29	#include "block/block.h"
	30	#include "block/blockjob.h"
	31	#include "block/block_int.h"
373340b2	32	#include "sysemu/block-backend.h"
cc7a8ea7	33	#include "qapi/qmp/qerror.h"
7b1b5d19	34	#include "qapi/qmp/qjson.h"
10817bf0	35	#include "qemu/coroutine.h"
2f0c9fe6	36	#include "qmp-commands.h"
1de7afc9	37	#include "qemu/timer.h"
5a2d2cbd	38	#include "qapi-event.h"
2f0c9fe6	39
3fc4b10a	40	void block_job_create(const BlockJobDriver driver, BlockDriverState *bs,
097310b5	41	int64_t speed, BlockCompletionFunc *cb,
2f0c9fe6 PB	42	void opaque, Error *errp)
	43	{
	44	BlockJob *job;
	45
628ff683	46	if (bs->job) {
c6bd8c70	47	error_setg(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
2f0c9fe6 PB	48	return NULL;
2f0c9fe6 PB	49	}
fa510ebf	50	bdrv_ref(bs);
3fc4b10a	51	job = g_malloc0(driver->instance_size);
3718d8ab FZ	52	error_setg(&job->blocker, "block device is in use by block job: %s",
	53	BlockJobType_lookup[driver->job_type]);
	54	bdrv_op_block_all(bs, job->blocker);
b112a65c	55	bdrv_op_unblock(bs, BLOCK_OP_TYPE_DATAPLANE, job->blocker);
3718d8ab	56
3fc4b10a	57	job->driver = driver;
8ccb9569	58	job->id = g_strdup(bdrv_get_device_name(bs));
2f0c9fe6 PB	59	job->bs = bs;
	60	job->cb = cb;
	61	job->opaque = opaque;
	62	job->busy = true;
	63	bs->job = job;
	64
	65	/* Only set speed when necessary to avoid NotSupported error */
	66	if (speed != 0) {
	67	Error *local_err = NULL;
	68
	69	block_job_set_speed(job, speed, &local_err);
84d18f06	70	if (local_err) {
97031164	71	block_job_release(bs);
2f0c9fe6 PB	72	error_propagate(errp, local_err);
	73	return NULL;
	74	}
	75	}
	76	return job;
	77	}
	78
97031164	79	void block_job_release(BlockDriverState *bs)
2f0c9fe6	80	{
97031164	81	BlockJob *job = bs->job;
2f0c9fe6	82
2f0c9fe6	83	bs->job = NULL;
3718d8ab FZ	84	bdrv_op_unblock_all(bs, job->blocker);
3718d8ab FZ	85	error_free(job->blocker);
8ccb9569	86	g_free(job->id);
2f0c9fe6	87	g_free(job);
2f0c9fe6 PB	88	}
2f0c9fe6 PB	89
97031164 TW	90	void block_job_completed(BlockJob *job, int ret)
	91	{
	92	BlockDriverState *bs = job->bs;
	93
	94	assert(bs->job == job);
	95	job->cb(job->opaque, ret);
	96	block_job_release(bs);
	97	}
	98
2f0c9fe6 PB	99	void block_job_set_speed(BlockJob job, int64_t speed, Error *errp)
	100	{
	101	Error *local_err = NULL;
	102
3fc4b10a	103	if (!job->driver->set_speed) {
c6bd8c70	104	error_setg(errp, QERR_UNSUPPORTED);
2f0c9fe6 PB	105	return;
2f0c9fe6 PB	106	}
3fc4b10a	107	job->driver->set_speed(job, speed, &local_err);
84d18f06	108	if (local_err) {
2f0c9fe6 PB	109	error_propagate(errp, local_err);
	110	return;
	111	}
	112
	113	job->speed = speed;
	114	}
	115
aeae883b PB	116	void block_job_complete(BlockJob job, Error *errp)
aeae883b PB	117	{
751ebd76	118	if (job->pause_count \|\| job->cancelled \|\| !job->driver->complete) {
8ccb9569	119	error_setg(errp, QERR_BLOCK_JOB_NOT_READY, job->id);
aeae883b PB	120	return;
	121	}
	122
3fc4b10a	123	job->driver->complete(job, errp);
aeae883b PB	124	}
aeae883b PB	125
8acc72a4	126	void block_job_pause(BlockJob *job)
2f0c9fe6	127	{
751ebd76	128	job->pause_count++;
8acc72a4 PB	129	}
	130
	131	bool block_job_is_paused(BlockJob *job)
	132	{
751ebd76	133	return job->pause_count > 0;
8acc72a4 PB	134	}
	135
	136	void block_job_resume(BlockJob *job)
	137	{
751ebd76 FZ	138	assert(job->pause_count > 0);
	139	job->pause_count--;
	140	if (job->pause_count) {
	141	return;
	142	}
	143	block_job_enter(job);
	144	}
	145
	146	void block_job_enter(BlockJob *job)
	147	{
32c81a4a	148	block_job_iostatus_reset(job);
2f0c9fe6 PB	149	if (job->co && !job->busy) {
	150	qemu_coroutine_enter(job->co, NULL);
	151	}
	152	}
	153
8acc72a4 PB	154	void block_job_cancel(BlockJob *job)
	155	{
	156	job->cancelled = true;
751ebd76	157	block_job_enter(job);
8acc72a4 PB	158	}
8acc72a4 PB	159
2f0c9fe6 PB	160	bool block_job_is_cancelled(BlockJob *job)
	161	{
	162	return job->cancelled;
	163	}
	164
32c81a4a PB	165	void block_job_iostatus_reset(BlockJob *job)
	166	{
	167	job->iostatus = BLOCK_DEVICE_IO_STATUS_OK;
3fc4b10a FZ	168	if (job->driver->iostatus_reset) {
3fc4b10a FZ	169	job->driver->iostatus_reset(job);
3bd293c3	170	}
32c81a4a PB	171	}
32c81a4a PB	172
345f9e1b	173	struct BlockFinishData {
2f0c9fe6	174	BlockJob *job;
097310b5	175	BlockCompletionFunc *cb;
2f0c9fe6 PB	176	void *opaque;
	177	bool cancelled;
	178	int ret;
	179	};
	180
345f9e1b	181	static void block_job_finish_cb(void *opaque, int ret)
2f0c9fe6	182	{
345f9e1b	183	struct BlockFinishData *data = opaque;
2f0c9fe6 PB	184
	185	data->cancelled = block_job_is_cancelled(data->job);
	186	data->ret = ret;
	187	data->cb(data->opaque, ret);
	188	}
	189
345f9e1b HR	190	static int block_job_finish_sync(BlockJob *job,
	191	void (finish)(BlockJob , Error **errp),
	192	Error **errp)
2f0c9fe6	193	{
345f9e1b	194	struct BlockFinishData data;
2f0c9fe6	195	BlockDriverState *bs = job->bs;
345f9e1b	196	Error *local_err = NULL;
2f0c9fe6 PB	197
	198	assert(bs->job == job);
	199
	200	/* Set up our own callback to store the result and chain to
	201	* the original callback.
	202	*/
	203	data.job = job;
	204	data.cb = job->cb;
	205	data.opaque = job->opaque;
	206	data.ret = -EINPROGRESS;
345f9e1b	207	job->cb = block_job_finish_cb;
2f0c9fe6	208	job->opaque = &data;
345f9e1b HR	209	finish(job, &local_err);
	210	if (local_err) {
	211	error_propagate(errp, local_err);
	212	return -EBUSY;
	213	}
2f0c9fe6	214	while (data.ret == -EINPROGRESS) {
b47ec2c4	215	aio_poll(bdrv_get_aio_context(bs), true);
2f0c9fe6 PB	216	}
	217	return (data.cancelled && data.ret == 0) ? -ECANCELED : data.ret;
	218	}
	219
345f9e1b HR	220	/* A wrapper around block_job_cancel() taking an Error ** parameter so it may be
	221	* used with block_job_finish_sync() without the need for (rather nasty)
	222	* function pointer casts there. */
	223	static void block_job_cancel_err(BlockJob job, Error *errp)
	224	{
	225	block_job_cancel(job);
	226	}
	227
	228	int block_job_cancel_sync(BlockJob *job)
	229	{
	230	return block_job_finish_sync(job, &block_job_cancel_err, NULL);
	231	}
	232
	233	int block_job_complete_sync(BlockJob job, Error *errp)
	234	{
	235	return block_job_finish_sync(job, &block_job_complete, errp);
	236	}
	237
7483d1e5	238	void block_job_sleep_ns(BlockJob *job, QEMUClockType type, int64_t ns)
2f0c9fe6	239	{
8acc72a4 PB	240	assert(job->busy);
8acc72a4 PB	241
2f0c9fe6	242	/* Check cancellation before setting busy = false, too! */
8acc72a4 PB	243	if (block_job_is_cancelled(job)) {
	244	return;
	245	}
	246
	247	job->busy = false;
	248	if (block_job_is_paused(job)) {
	249	qemu_coroutine_yield();
	250	} else {
0b9caf9b	251	co_aio_sleep_ns(bdrv_get_aio_context(job->bs), type, ns);
2f0c9fe6	252	}
8acc72a4	253	job->busy = true;
2f0c9fe6	254	}
30e628b7	255
dc71ce45 FZ	256	void block_job_yield(BlockJob *job)
	257	{
	258	assert(job->busy);
	259
	260	/* Check cancellation before setting busy = false, too! */
	261	if (block_job_is_cancelled(job)) {
	262	return;
	263	}
	264
	265	job->busy = false;
	266	qemu_coroutine_yield();
	267	job->busy = true;
	268	}
	269
30e628b7 PB	270	BlockJobInfo block_job_query(BlockJob job)
	271	{
	272	BlockJobInfo *info = g_new0(BlockJobInfo, 1);
79e14bf7	273	info->type = g_strdup(BlockJobType_lookup[job->driver->job_type]);
8ccb9569	274	info->device = g_strdup(job->id);
32c81a4a PB	275	info->len = job->len;
32c81a4a PB	276	info->busy = job->busy;
751ebd76	277	info->paused = job->pause_count > 0;
32c81a4a PB	278	info->offset = job->offset;
	279	info->speed = job->speed;
	280	info->io_status = job->iostatus;
ef6dbf1e	281	info->ready = job->ready;
30e628b7 PB	282	return info;
30e628b7 PB	283	}
32c81a4a PB	284
	285	static void block_job_iostatus_set_err(BlockJob *job, int error)
	286	{
	287	if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) {
	288	job->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE :
	289	BLOCK_DEVICE_IO_STATUS_FAILED;
	290	}
	291	}
	292
bcada37b WX	293	void block_job_event_cancelled(BlockJob *job)
	294	{
	295	qapi_event_send_block_job_cancelled(job->driver->job_type,
8ccb9569	296	job->id,
bcada37b WX	297	job->len,
	298	job->offset,
	299	job->speed,
	300	&error_abort);
	301	}
32c81a4a	302
bcada37b	303	void block_job_event_completed(BlockJob job, const char msg)
a66a2a36	304	{
bcada37b	305	qapi_event_send_block_job_completed(job->driver->job_type,
8ccb9569	306	job->id,
bcada37b WX	307	job->len,
	308	job->offset,
	309	job->speed,
	310	!!msg,
	311	msg,
	312	&error_abort);
a66a2a36 PB	313	}
a66a2a36 PB	314
bcada37b	315	void block_job_event_ready(BlockJob *job)
a66a2a36	316	{
ef6dbf1e HR	317	job->ready = true;
ef6dbf1e HR	318
518848a2	319	qapi_event_send_block_job_ready(job->driver->job_type,
8ccb9569	320	job->id,
518848a2 MA	321	job->len,
	322	job->offset,
	323	job->speed, &error_abort);
a66a2a36 PB	324	}
a66a2a36 PB	325
32c81a4a PB	326	BlockErrorAction block_job_error_action(BlockJob job, BlockDriverState bs,
	327	BlockdevOnError on_err,
	328	int is_read, int error)
	329	{
	330	BlockErrorAction action;
	331
	332	switch (on_err) {
	333	case BLOCKDEV_ON_ERROR_ENOSPC:
a589569f WX	334	action = (error == ENOSPC) ?
a589569f WX	335	BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT;
32c81a4a PB	336	break;
32c81a4a PB	337	case BLOCKDEV_ON_ERROR_STOP:
a589569f	338	action = BLOCK_ERROR_ACTION_STOP;
32c81a4a PB	339	break;
32c81a4a PB	340	case BLOCKDEV_ON_ERROR_REPORT:
a589569f	341	action = BLOCK_ERROR_ACTION_REPORT;
32c81a4a PB	342	break;
32c81a4a PB	343	case BLOCKDEV_ON_ERROR_IGNORE:
a589569f	344	action = BLOCK_ERROR_ACTION_IGNORE;
32c81a4a PB	345	break;
	346	default:
	347	abort();
	348	}
8ccb9569	349	qapi_event_send_block_job_error(job->id,
5a2d2cbd WX	350	is_read ? IO_OPERATION_TYPE_READ :
	351	IO_OPERATION_TYPE_WRITE,
	352	action, &error_abort);
a589569f	353	if (action == BLOCK_ERROR_ACTION_STOP) {
751ebd76 FZ	354	/* make the pause user visible, which will be resumed from QMP. */
751ebd76 FZ	355	job->user_paused = true;
32c81a4a PB	356	block_job_pause(job);
32c81a4a PB	357	block_job_iostatus_set_err(job, error);
373340b2 HR	358	if (bs->blk && bs != job->bs) {
373340b2 HR	359	blk_iostatus_set_err(bs->blk, error);
32c81a4a PB	360	}
	361	}
	362	return action;
	363	}
dec7d421 SH	364
	365	typedef struct {
	366	BlockJob *job;
	367	QEMUBH *bh;
	368	AioContext *aio_context;
	369	BlockJobDeferToMainLoopFn *fn;
	370	void *opaque;
	371	} BlockJobDeferToMainLoopData;
	372
	373	static void block_job_defer_to_main_loop_bh(void *opaque)
	374	{
	375	BlockJobDeferToMainLoopData *data = opaque;
	376	AioContext *aio_context;
	377
	378	qemu_bh_delete(data->bh);
	379
	380	/* Prevent race with block_job_defer_to_main_loop() */
	381	aio_context_acquire(data->aio_context);
	382
	383	/* Fetch BDS AioContext again, in case it has changed */
	384	aio_context = bdrv_get_aio_context(data->job->bs);
	385	aio_context_acquire(aio_context);
	386
	387	data->fn(data->job, data->opaque);
	388
	389	aio_context_release(aio_context);
	390
	391	aio_context_release(data->aio_context);
	392
	393	g_free(data);
	394	}
	395
	396	void block_job_defer_to_main_loop(BlockJob *job,
	397	BlockJobDeferToMainLoopFn *fn,
	398	void *opaque)
	399	{
	400	BlockJobDeferToMainLoopData data = g_malloc(sizeof(data));
	401	data->job = job;
	402	data->bh = qemu_bh_new(block_job_defer_to_main_loop_bh, data);
	403	data->aio_context = bdrv_get_aio_context(job->bs);
	404	data->fn = fn;
	405	data->opaque = opaque;
	406
	407	qemu_bh_schedule(data->bh);
	408	}