[mirror_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/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_set(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) {
            bs->job = NULL;
            bdrv_op_unblock_all(bs, job->blocker);
            error_free(job->blocker);
            g_free(job);
            error_propagate(errp, local_err);
            return NULL;
        }
    }
    return job;
}

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

    assert(bs->job == job);
    job->cb(job->opaque, ret);
    bs->job = NULL;
    bdrv_op_unblock_all(bs, job->blocker);
    error_free(job->blocker);
    g_free(job);
}

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

    if (!job->driver->set_speed) {
        error_set(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->paused || job->cancelled || !job->driver->complete) {
        error_set(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->paused = true;
}

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

void block_job_resume(BlockJob *job)
{
    job->paused = false;
    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_resume(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->paused;
    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) {
        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"
7b1b5d19	32	#include "qapi/qmp/qjson.h"
737e150e	33	#include "block/coroutine.h"
2f0c9fe6	34	#include "qmp-commands.h"
1de7afc9	35	#include "qemu/timer.h"
5a2d2cbd	36	#include "qapi-event.h"
2f0c9fe6	37
3fc4b10a	38	void block_job_create(const BlockJobDriver driver, BlockDriverState *bs,
097310b5	39	int64_t speed, BlockCompletionFunc *cb,
2f0c9fe6 PB	40	void opaque, Error *errp)
	41	{
	42	BlockJob *job;
	43
628ff683	44	if (bs->job) {
2f0c9fe6 PB	45	error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
	46	return NULL;
	47	}
fa510ebf	48	bdrv_ref(bs);
3fc4b10a	49	job = g_malloc0(driver->instance_size);
3718d8ab FZ	50	error_setg(&job->blocker, "block device is in use by block job: %s",
	51	BlockJobType_lookup[driver->job_type]);
	52	bdrv_op_block_all(bs, job->blocker);
b112a65c	53	bdrv_op_unblock(bs, BLOCK_OP_TYPE_DATAPLANE, job->blocker);
3718d8ab	54
3fc4b10a	55	job->driver = driver;
2f0c9fe6 PB	56	job->bs = bs;
	57	job->cb = cb;
	58	job->opaque = opaque;
	59	job->busy = true;
	60	bs->job = job;
	61
	62	/* Only set speed when necessary to avoid NotSupported error */
	63	if (speed != 0) {
	64	Error *local_err = NULL;
	65
	66	block_job_set_speed(job, speed, &local_err);
84d18f06	67	if (local_err) {
2f0c9fe6	68	bs->job = NULL;
3718d8ab FZ	69	bdrv_op_unblock_all(bs, job->blocker);
3718d8ab FZ	70	error_free(job->blocker);
2f0c9fe6	71	g_free(job);
2f0c9fe6 PB	72	error_propagate(errp, local_err);
	73	return NULL;
	74	}
	75	}
	76	return job;
	77	}
	78
65f46322	79	void block_job_completed(BlockJob *job, int ret)
2f0c9fe6 PB	80	{
	81	BlockDriverState *bs = job->bs;
	82
	83	assert(bs->job == job);
	84	job->cb(job->opaque, ret);
	85	bs->job = NULL;
3718d8ab FZ	86	bdrv_op_unblock_all(bs, job->blocker);
3718d8ab FZ	87	error_free(job->blocker);
2f0c9fe6	88	g_free(job);
2f0c9fe6 PB	89	}
	90
	91	void block_job_set_speed(BlockJob job, int64_t speed, Error *errp)
	92	{
	93	Error *local_err = NULL;
	94
3fc4b10a	95	if (!job->driver->set_speed) {
0b15abfc	96	error_set(errp, QERR_UNSUPPORTED);
2f0c9fe6 PB	97	return;
2f0c9fe6 PB	98	}
3fc4b10a	99	job->driver->set_speed(job, speed, &local_err);
84d18f06	100	if (local_err) {
2f0c9fe6 PB	101	error_propagate(errp, local_err);
	102	return;
	103	}
	104
	105	job->speed = speed;
	106	}
	107
aeae883b PB	108	void block_job_complete(BlockJob job, Error *errp)
aeae883b PB	109	{
3fc4b10a	110	if (job->paused \|\| job->cancelled \|\| !job->driver->complete) {
bfb197e0 MA	111	error_set(errp, QERR_BLOCK_JOB_NOT_READY,
bfb197e0 MA	112	bdrv_get_device_name(job->bs));
aeae883b PB	113	return;
	114	}
	115
3fc4b10a	116	job->driver->complete(job, errp);
aeae883b PB	117	}
aeae883b PB	118
8acc72a4	119	void block_job_pause(BlockJob *job)
2f0c9fe6	120	{
8acc72a4 PB	121	job->paused = true;
	122	}
	123
	124	bool block_job_is_paused(BlockJob *job)
	125	{
	126	return job->paused;
	127	}
	128
	129	void block_job_resume(BlockJob *job)
	130	{
	131	job->paused = false;
32c81a4a	132	block_job_iostatus_reset(job);
2f0c9fe6 PB	133	if (job->co && !job->busy) {
	134	qemu_coroutine_enter(job->co, NULL);
	135	}
	136	}
	137
8acc72a4 PB	138	void block_job_cancel(BlockJob *job)
	139	{
	140	job->cancelled = true;
	141	block_job_resume(job);
	142	}
	143
2f0c9fe6 PB	144	bool block_job_is_cancelled(BlockJob *job)
	145	{
	146	return job->cancelled;
	147	}
	148
32c81a4a PB	149	void block_job_iostatus_reset(BlockJob *job)
	150	{
	151	job->iostatus = BLOCK_DEVICE_IO_STATUS_OK;
3fc4b10a FZ	152	if (job->driver->iostatus_reset) {
3fc4b10a FZ	153	job->driver->iostatus_reset(job);
3bd293c3	154	}
32c81a4a PB	155	}
32c81a4a PB	156
345f9e1b	157	struct BlockFinishData {
2f0c9fe6	158	BlockJob *job;
097310b5	159	BlockCompletionFunc *cb;
2f0c9fe6 PB	160	void *opaque;
	161	bool cancelled;
	162	int ret;
	163	};
	164
345f9e1b	165	static void block_job_finish_cb(void *opaque, int ret)
2f0c9fe6	166	{
345f9e1b	167	struct BlockFinishData *data = opaque;
2f0c9fe6 PB	168
	169	data->cancelled = block_job_is_cancelled(data->job);
	170	data->ret = ret;
	171	data->cb(data->opaque, ret);
	172	}
	173
345f9e1b HR	174	static int block_job_finish_sync(BlockJob *job,
	175	void (finish)(BlockJob , Error **errp),
	176	Error **errp)
2f0c9fe6	177	{
345f9e1b	178	struct BlockFinishData data;
2f0c9fe6	179	BlockDriverState *bs = job->bs;
345f9e1b	180	Error *local_err = NULL;
2f0c9fe6 PB	181
	182	assert(bs->job == job);
	183
	184	/* Set up our own callback to store the result and chain to
	185	* the original callback.
	186	*/
	187	data.job = job;
	188	data.cb = job->cb;
	189	data.opaque = job->opaque;
	190	data.ret = -EINPROGRESS;
345f9e1b	191	job->cb = block_job_finish_cb;
2f0c9fe6	192	job->opaque = &data;
345f9e1b HR	193	finish(job, &local_err);
	194	if (local_err) {
	195	error_propagate(errp, local_err);
	196	return -EBUSY;
	197	}
2f0c9fe6	198	while (data.ret == -EINPROGRESS) {
b47ec2c4	199	aio_poll(bdrv_get_aio_context(bs), true);
2f0c9fe6 PB	200	}
	201	return (data.cancelled && data.ret == 0) ? -ECANCELED : data.ret;
	202	}
	203
345f9e1b HR	204	/* A wrapper around block_job_cancel() taking an Error ** parameter so it may be
	205	* used with block_job_finish_sync() without the need for (rather nasty)
	206	* function pointer casts there. */
	207	static void block_job_cancel_err(BlockJob job, Error *errp)
	208	{
	209	block_job_cancel(job);
	210	}
	211
	212	int block_job_cancel_sync(BlockJob *job)
	213	{
	214	return block_job_finish_sync(job, &block_job_cancel_err, NULL);
	215	}
	216
	217	int block_job_complete_sync(BlockJob job, Error *errp)
	218	{
	219	return block_job_finish_sync(job, &block_job_complete, errp);
	220	}
	221
7483d1e5	222	void block_job_sleep_ns(BlockJob *job, QEMUClockType type, int64_t ns)
2f0c9fe6	223	{
8acc72a4 PB	224	assert(job->busy);
8acc72a4 PB	225
2f0c9fe6	226	/* Check cancellation before setting busy = false, too! */
8acc72a4 PB	227	if (block_job_is_cancelled(job)) {
	228	return;
	229	}
	230
	231	job->busy = false;
	232	if (block_job_is_paused(job)) {
	233	qemu_coroutine_yield();
	234	} else {
0b9caf9b	235	co_aio_sleep_ns(bdrv_get_aio_context(job->bs), type, ns);
2f0c9fe6	236	}
8acc72a4	237	job->busy = true;
2f0c9fe6	238	}
30e628b7	239
dc71ce45 FZ	240	void block_job_yield(BlockJob *job)
	241	{
	242	assert(job->busy);
	243
	244	/* Check cancellation before setting busy = false, too! */
	245	if (block_job_is_cancelled(job)) {
	246	return;
	247	}
	248
	249	job->busy = false;
	250	qemu_coroutine_yield();
	251	job->busy = true;
	252	}
	253
30e628b7 PB	254	BlockJobInfo block_job_query(BlockJob job)
	255	{
	256	BlockJobInfo *info = g_new0(BlockJobInfo, 1);
79e14bf7	257	info->type = g_strdup(BlockJobType_lookup[job->driver->job_type]);
32c81a4a PB	258	info->device = g_strdup(bdrv_get_device_name(job->bs));
	259	info->len = job->len;
	260	info->busy = job->busy;
	261	info->paused = job->paused;
	262	info->offset = job->offset;
	263	info->speed = job->speed;
	264	info->io_status = job->iostatus;
ef6dbf1e	265	info->ready = job->ready;
30e628b7 PB	266	return info;
30e628b7 PB	267	}
32c81a4a PB	268
	269	static void block_job_iostatus_set_err(BlockJob *job, int error)
	270	{
	271	if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) {
	272	job->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE :
	273	BLOCK_DEVICE_IO_STATUS_FAILED;
	274	}
	275	}
	276
bcada37b WX	277	void block_job_event_cancelled(BlockJob *job)
	278	{
	279	qapi_event_send_block_job_cancelled(job->driver->job_type,
	280	bdrv_get_device_name(job->bs),
	281	job->len,
	282	job->offset,
	283	job->speed,
	284	&error_abort);
	285	}
32c81a4a	286
bcada37b	287	void block_job_event_completed(BlockJob job, const char msg)
a66a2a36	288	{
bcada37b WX	289	qapi_event_send_block_job_completed(job->driver->job_type,
	290	bdrv_get_device_name(job->bs),
	291	job->len,
	292	job->offset,
	293	job->speed,
	294	!!msg,
	295	msg,
	296	&error_abort);
a66a2a36 PB	297	}
a66a2a36 PB	298
bcada37b	299	void block_job_event_ready(BlockJob *job)
a66a2a36	300	{
ef6dbf1e HR	301	job->ready = true;
ef6dbf1e HR	302
518848a2 MA	303	qapi_event_send_block_job_ready(job->driver->job_type,
	304	bdrv_get_device_name(job->bs),
	305	job->len,
	306	job->offset,
	307	job->speed, &error_abort);
a66a2a36 PB	308	}
a66a2a36 PB	309
32c81a4a PB	310	BlockErrorAction block_job_error_action(BlockJob job, BlockDriverState bs,
	311	BlockdevOnError on_err,
	312	int is_read, int error)
	313	{
	314	BlockErrorAction action;
	315
	316	switch (on_err) {
	317	case BLOCKDEV_ON_ERROR_ENOSPC:
a589569f WX	318	action = (error == ENOSPC) ?
a589569f WX	319	BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT;
32c81a4a PB	320	break;
32c81a4a PB	321	case BLOCKDEV_ON_ERROR_STOP:
a589569f	322	action = BLOCK_ERROR_ACTION_STOP;
32c81a4a PB	323	break;
32c81a4a PB	324	case BLOCKDEV_ON_ERROR_REPORT:
a589569f	325	action = BLOCK_ERROR_ACTION_REPORT;
32c81a4a PB	326	break;
32c81a4a PB	327	case BLOCKDEV_ON_ERROR_IGNORE:
a589569f	328	action = BLOCK_ERROR_ACTION_IGNORE;
32c81a4a PB	329	break;
	330	default:
	331	abort();
	332	}
823c6863	333	qapi_event_send_block_job_error(bdrv_get_device_name(job->bs),
5a2d2cbd WX	334	is_read ? IO_OPERATION_TYPE_READ :
	335	IO_OPERATION_TYPE_WRITE,
	336	action, &error_abort);
a589569f	337	if (action == BLOCK_ERROR_ACTION_STOP) {
32c81a4a PB	338	block_job_pause(job);
	339	block_job_iostatus_set_err(job, error);
	340	if (bs != job->bs) {
	341	bdrv_iostatus_set_err(bs, error);
	342	}
	343	}
	344	return action;
	345	}
dec7d421 SH	346
	347	typedef struct {
	348	BlockJob *job;
	349	QEMUBH *bh;
	350	AioContext *aio_context;
	351	BlockJobDeferToMainLoopFn *fn;
	352	void *opaque;
	353	} BlockJobDeferToMainLoopData;
	354
	355	static void block_job_defer_to_main_loop_bh(void *opaque)
	356	{
	357	BlockJobDeferToMainLoopData *data = opaque;
	358	AioContext *aio_context;
	359
	360	qemu_bh_delete(data->bh);
	361
	362	/* Prevent race with block_job_defer_to_main_loop() */
	363	aio_context_acquire(data->aio_context);
	364
	365	/* Fetch BDS AioContext again, in case it has changed */
	366	aio_context = bdrv_get_aio_context(data->job->bs);
	367	aio_context_acquire(aio_context);
	368
	369	data->fn(data->job, data->opaque);
	370
	371	aio_context_release(aio_context);
	372
	373	aio_context_release(data->aio_context);
	374
	375	g_free(data);
	376	}
	377
	378	void block_job_defer_to_main_loop(BlockJob *job,
	379	BlockJobDeferToMainLoopFn *fn,
	380	void *opaque)
	381	{
	382	BlockJobDeferToMainLoopData data = g_malloc(sizeof(data));
	383	data->job = job;
	384	data->bh = qemu_bh_new(block_job_defer_to_main_loop_bh, data);
	385	data->aio_context = bdrv_get_aio_context(job->bs);
	386	data->fn = fn;
	387	data->opaque = opaque;
	388
	389	qemu_bh_schedule(data->bh);
	390	}