[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 "qapi/qmp/qerror.h"
#include "qapi/qmp/qjson.h"
#include "block/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->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);
}

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,
                   bdrv_get_device_name(job->bs));
        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(bdrv_get_device_name(job->bs));
    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,
                                        bdrv_get_device_name(job->bs),
                                        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,
                                        bdrv_get_device_name(job->bs),
                                        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,
                                    bdrv_get_device_name(job->bs),
                                    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(bdrv_get_device_name(job->bs),
                                    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 != job->bs) {
            bdrv_iostatus_set_err(bs, 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"
cc7a8ea7	32	#include "qapi/qmp/qerror.h"
7b1b5d19	33	#include "qapi/qmp/qjson.h"
737e150e	34	#include "block/coroutine.h"
2f0c9fe6	35	#include "qmp-commands.h"
1de7afc9	36	#include "qemu/timer.h"
5a2d2cbd	37	#include "qapi-event.h"
2f0c9fe6	38
3fc4b10a	39	void block_job_create(const BlockJobDriver driver, BlockDriverState *bs,
097310b5	40	int64_t speed, BlockCompletionFunc *cb,
2f0c9fe6 PB	41	void opaque, Error *errp)
	42	{
	43	BlockJob *job;
	44
628ff683	45	if (bs->job) {
c6bd8c70	46	error_setg(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
2f0c9fe6 PB	47	return NULL;
2f0c9fe6 PB	48	}
fa510ebf	49	bdrv_ref(bs);
3fc4b10a	50	job = g_malloc0(driver->instance_size);
3718d8ab FZ	51	error_setg(&job->blocker, "block device is in use by block job: %s",
	52	BlockJobType_lookup[driver->job_type]);
	53	bdrv_op_block_all(bs, job->blocker);
b112a65c	54	bdrv_op_unblock(bs, BLOCK_OP_TYPE_DATAPLANE, job->blocker);
3718d8ab	55
3fc4b10a	56	job->driver = driver;
2f0c9fe6 PB	57	job->bs = bs;
	58	job->cb = cb;
	59	job->opaque = opaque;
	60	job->busy = true;
	61	bs->job = job;
	62
	63	/* Only set speed when necessary to avoid NotSupported error */
	64	if (speed != 0) {
	65	Error *local_err = NULL;
	66
	67	block_job_set_speed(job, speed, &local_err);
84d18f06	68	if (local_err) {
97031164	69	block_job_release(bs);
2f0c9fe6 PB	70	error_propagate(errp, local_err);
	71	return NULL;
	72	}
	73	}
	74	return job;
	75	}
	76
97031164	77	void block_job_release(BlockDriverState *bs)
2f0c9fe6	78	{
97031164	79	BlockJob *job = bs->job;
2f0c9fe6	80
2f0c9fe6	81	bs->job = NULL;
3718d8ab FZ	82	bdrv_op_unblock_all(bs, job->blocker);
3718d8ab FZ	83	error_free(job->blocker);
2f0c9fe6	84	g_free(job);
2f0c9fe6 PB	85	}
2f0c9fe6 PB	86
97031164 TW	87	void block_job_completed(BlockJob *job, int ret)
	88	{
	89	BlockDriverState *bs = job->bs;
	90
	91	assert(bs->job == job);
	92	job->cb(job->opaque, ret);
	93	block_job_release(bs);
	94	}
	95
2f0c9fe6 PB	96	void block_job_set_speed(BlockJob job, int64_t speed, Error *errp)
	97	{
	98	Error *local_err = NULL;
	99
3fc4b10a	100	if (!job->driver->set_speed) {
c6bd8c70	101	error_setg(errp, QERR_UNSUPPORTED);
2f0c9fe6 PB	102	return;
2f0c9fe6 PB	103	}
3fc4b10a	104	job->driver->set_speed(job, speed, &local_err);
84d18f06	105	if (local_err) {
2f0c9fe6 PB	106	error_propagate(errp, local_err);
	107	return;
	108	}
	109
	110	job->speed = speed;
	111	}
	112
aeae883b PB	113	void block_job_complete(BlockJob job, Error *errp)
aeae883b PB	114	{
751ebd76	115	if (job->pause_count \|\| job->cancelled \|\| !job->driver->complete) {
c6bd8c70 MA	116	error_setg(errp, QERR_BLOCK_JOB_NOT_READY,
c6bd8c70 MA	117	bdrv_get_device_name(job->bs));
aeae883b PB	118	return;
	119	}
	120
3fc4b10a	121	job->driver->complete(job, errp);
aeae883b PB	122	}
aeae883b PB	123
8acc72a4	124	void block_job_pause(BlockJob *job)
2f0c9fe6	125	{
751ebd76	126	job->pause_count++;
8acc72a4 PB	127	}
	128
	129	bool block_job_is_paused(BlockJob *job)
	130	{
751ebd76	131	return job->pause_count > 0;
8acc72a4 PB	132	}
	133
	134	void block_job_resume(BlockJob *job)
	135	{
751ebd76 FZ	136	assert(job->pause_count > 0);
	137	job->pause_count--;
	138	if (job->pause_count) {
	139	return;
	140	}
	141	block_job_enter(job);
	142	}
	143
	144	void block_job_enter(BlockJob *job)
	145	{
32c81a4a	146	block_job_iostatus_reset(job);
2f0c9fe6 PB	147	if (job->co && !job->busy) {
	148	qemu_coroutine_enter(job->co, NULL);
	149	}
	150	}
	151
8acc72a4 PB	152	void block_job_cancel(BlockJob *job)
	153	{
	154	job->cancelled = true;
751ebd76	155	block_job_enter(job);
8acc72a4 PB	156	}
8acc72a4 PB	157
2f0c9fe6 PB	158	bool block_job_is_cancelled(BlockJob *job)
	159	{
	160	return job->cancelled;
	161	}
	162
32c81a4a PB	163	void block_job_iostatus_reset(BlockJob *job)
	164	{
	165	job->iostatus = BLOCK_DEVICE_IO_STATUS_OK;
3fc4b10a FZ	166	if (job->driver->iostatus_reset) {
3fc4b10a FZ	167	job->driver->iostatus_reset(job);
3bd293c3	168	}
32c81a4a PB	169	}
32c81a4a PB	170
345f9e1b	171	struct BlockFinishData {
2f0c9fe6	172	BlockJob *job;
097310b5	173	BlockCompletionFunc *cb;
2f0c9fe6 PB	174	void *opaque;
	175	bool cancelled;
	176	int ret;
	177	};
	178
345f9e1b	179	static void block_job_finish_cb(void *opaque, int ret)
2f0c9fe6	180	{
345f9e1b	181	struct BlockFinishData *data = opaque;
2f0c9fe6 PB	182
	183	data->cancelled = block_job_is_cancelled(data->job);
	184	data->ret = ret;
	185	data->cb(data->opaque, ret);
	186	}
	187
345f9e1b HR	188	static int block_job_finish_sync(BlockJob *job,
	189	void (finish)(BlockJob , Error **errp),
	190	Error **errp)
2f0c9fe6	191	{
345f9e1b	192	struct BlockFinishData data;
2f0c9fe6	193	BlockDriverState *bs = job->bs;
345f9e1b	194	Error *local_err = NULL;
2f0c9fe6 PB	195
	196	assert(bs->job == job);
	197
	198	/* Set up our own callback to store the result and chain to
	199	* the original callback.
	200	*/
	201	data.job = job;
	202	data.cb = job->cb;
	203	data.opaque = job->opaque;
	204	data.ret = -EINPROGRESS;
345f9e1b	205	job->cb = block_job_finish_cb;
2f0c9fe6	206	job->opaque = &data;
345f9e1b HR	207	finish(job, &local_err);
	208	if (local_err) {
	209	error_propagate(errp, local_err);
	210	return -EBUSY;
	211	}
2f0c9fe6	212	while (data.ret == -EINPROGRESS) {
b47ec2c4	213	aio_poll(bdrv_get_aio_context(bs), true);
2f0c9fe6 PB	214	}
	215	return (data.cancelled && data.ret == 0) ? -ECANCELED : data.ret;
	216	}
	217
345f9e1b HR	218	/* A wrapper around block_job_cancel() taking an Error ** parameter so it may be
	219	* used with block_job_finish_sync() without the need for (rather nasty)
	220	* function pointer casts there. */
	221	static void block_job_cancel_err(BlockJob job, Error *errp)
	222	{
	223	block_job_cancel(job);
	224	}
	225
	226	int block_job_cancel_sync(BlockJob *job)
	227	{
	228	return block_job_finish_sync(job, &block_job_cancel_err, NULL);
	229	}
	230
	231	int block_job_complete_sync(BlockJob job, Error *errp)
	232	{
	233	return block_job_finish_sync(job, &block_job_complete, errp);
	234	}
	235
7483d1e5	236	void block_job_sleep_ns(BlockJob *job, QEMUClockType type, int64_t ns)
2f0c9fe6	237	{
8acc72a4 PB	238	assert(job->busy);
8acc72a4 PB	239
2f0c9fe6	240	/* Check cancellation before setting busy = false, too! */
8acc72a4 PB	241	if (block_job_is_cancelled(job)) {
	242	return;
	243	}
	244
	245	job->busy = false;
	246	if (block_job_is_paused(job)) {
	247	qemu_coroutine_yield();
	248	} else {
0b9caf9b	249	co_aio_sleep_ns(bdrv_get_aio_context(job->bs), type, ns);
2f0c9fe6	250	}
8acc72a4	251	job->busy = true;
2f0c9fe6	252	}
30e628b7	253
dc71ce45 FZ	254	void block_job_yield(BlockJob *job)
	255	{
	256	assert(job->busy);
	257
	258	/* Check cancellation before setting busy = false, too! */
	259	if (block_job_is_cancelled(job)) {
	260	return;
	261	}
	262
	263	job->busy = false;
	264	qemu_coroutine_yield();
	265	job->busy = true;
	266	}
	267
30e628b7 PB	268	BlockJobInfo block_job_query(BlockJob job)
	269	{
	270	BlockJobInfo *info = g_new0(BlockJobInfo, 1);
79e14bf7	271	info->type = g_strdup(BlockJobType_lookup[job->driver->job_type]);
32c81a4a PB	272	info->device = g_strdup(bdrv_get_device_name(job->bs));
	273	info->len = job->len;
	274	info->busy = job->busy;
751ebd76	275	info->paused = job->pause_count > 0;
32c81a4a PB	276	info->offset = job->offset;
	277	info->speed = job->speed;
	278	info->io_status = job->iostatus;
ef6dbf1e	279	info->ready = job->ready;
30e628b7 PB	280	return info;
30e628b7 PB	281	}
32c81a4a PB	282
	283	static void block_job_iostatus_set_err(BlockJob *job, int error)
	284	{
	285	if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) {
	286	job->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE :
	287	BLOCK_DEVICE_IO_STATUS_FAILED;
	288	}
	289	}
	290
bcada37b WX	291	void block_job_event_cancelled(BlockJob *job)
	292	{
	293	qapi_event_send_block_job_cancelled(job->driver->job_type,
	294	bdrv_get_device_name(job->bs),
	295	job->len,
	296	job->offset,
	297	job->speed,
	298	&error_abort);
	299	}
32c81a4a	300
bcada37b	301	void block_job_event_completed(BlockJob job, const char msg)
a66a2a36	302	{
bcada37b WX	303	qapi_event_send_block_job_completed(job->driver->job_type,
	304	bdrv_get_device_name(job->bs),
	305	job->len,
	306	job->offset,
	307	job->speed,
	308	!!msg,
	309	msg,
	310	&error_abort);
a66a2a36 PB	311	}
a66a2a36 PB	312
bcada37b	313	void block_job_event_ready(BlockJob *job)
a66a2a36	314	{
ef6dbf1e HR	315	job->ready = true;
ef6dbf1e HR	316
518848a2 MA	317	qapi_event_send_block_job_ready(job->driver->job_type,
	318	bdrv_get_device_name(job->bs),
	319	job->len,
	320	job->offset,
	321	job->speed, &error_abort);
a66a2a36 PB	322	}
a66a2a36 PB	323
32c81a4a PB	324	BlockErrorAction block_job_error_action(BlockJob job, BlockDriverState bs,
	325	BlockdevOnError on_err,
	326	int is_read, int error)
	327	{
	328	BlockErrorAction action;
	329
	330	switch (on_err) {
	331	case BLOCKDEV_ON_ERROR_ENOSPC:
a589569f WX	332	action = (error == ENOSPC) ?
a589569f WX	333	BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT;
32c81a4a PB	334	break;
32c81a4a PB	335	case BLOCKDEV_ON_ERROR_STOP:
a589569f	336	action = BLOCK_ERROR_ACTION_STOP;
32c81a4a PB	337	break;
32c81a4a PB	338	case BLOCKDEV_ON_ERROR_REPORT:
a589569f	339	action = BLOCK_ERROR_ACTION_REPORT;
32c81a4a PB	340	break;
32c81a4a PB	341	case BLOCKDEV_ON_ERROR_IGNORE:
a589569f	342	action = BLOCK_ERROR_ACTION_IGNORE;
32c81a4a PB	343	break;
	344	default:
	345	abort();
	346	}
823c6863	347	qapi_event_send_block_job_error(bdrv_get_device_name(job->bs),
5a2d2cbd WX	348	is_read ? IO_OPERATION_TYPE_READ :
	349	IO_OPERATION_TYPE_WRITE,
	350	action, &error_abort);
a589569f	351	if (action == BLOCK_ERROR_ACTION_STOP) {
751ebd76 FZ	352	/* make the pause user visible, which will be resumed from QMP. */
751ebd76 FZ	353	job->user_paused = true;
32c81a4a PB	354	block_job_pause(job);
	355	block_job_iostatus_set_err(job, error);
	356	if (bs != job->bs) {
	357	bdrv_iostatus_set_err(bs, error);
	358	}
	359	}
	360	return action;
	361	}
dec7d421 SH	362
	363	typedef struct {
	364	BlockJob *job;
	365	QEMUBH *bh;
	366	AioContext *aio_context;
	367	BlockJobDeferToMainLoopFn *fn;
	368	void *opaque;
	369	} BlockJobDeferToMainLoopData;
	370
	371	static void block_job_defer_to_main_loop_bh(void *opaque)
	372	{
	373	BlockJobDeferToMainLoopData *data = opaque;
	374	AioContext *aio_context;
	375
	376	qemu_bh_delete(data->bh);
	377
	378	/* Prevent race with block_job_defer_to_main_loop() */
	379	aio_context_acquire(data->aio_context);
	380
	381	/* Fetch BDS AioContext again, in case it has changed */
	382	aio_context = bdrv_get_aio_context(data->job->bs);
	383	aio_context_acquire(aio_context);
	384
	385	data->fn(data->job, data->opaque);
	386
	387	aio_context_release(aio_context);
	388
	389	aio_context_release(data->aio_context);
	390
	391	g_free(data);
	392	}
	393
	394	void block_job_defer_to_main_loop(BlockJob *job,
	395	BlockJobDeferToMainLoopFn *fn,
	396	void *opaque)
	397	{
	398	BlockJobDeferToMainLoopData data = g_malloc(sizeof(data));
	399	data->job = job;
	400	data->bh = qemu_bh_new(block_job_defer_to_main_loop_bh, data);
	401	data->aio_context = bdrv_get_aio_context(job->bs);
	402	data->fn = fn;
	403	data->opaque = opaque;
	404
	405	qemu_bh_schedule(data->bh);
	406	}