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iscsi: implement .bdrv_detach/attach_aio_context()
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Drop the assumption that we're using the main AioContext for Linux
AIO.  Convert qemu_aio_set_fd_handler() to aio_set_fd_handler() and
timer_new_ms() to aio_timer_new().

The .bdrv_detach/attach_aio_context() interfaces also need to be
implemented to move the fd and timer from the old to the new AioContext.

Cc: Peter Lieven <pl@kamp.de>
Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Peter Lieven <pl@kamp.de>
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@stefanhaRH
stefanhaRH committed Jun 4, 2014
1 parent 6ee50af commit 80cf625
Showing 1 changed file with 56 additions and 24 deletions.
80 changes: 56 additions & 24 deletions block/iscsi.c
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Expand Up @@ -49,6 +49,7 @@

typedef struct IscsiLun {
struct iscsi_context *iscsi;
AioContext *aio_context;
int lun;
enum scsi_inquiry_peripheral_device_type type;
int block_size;
Expand All @@ -73,6 +74,7 @@ typedef struct IscsiTask {
struct scsi_task *task;
Coroutine *co;
QEMUBH *bh;
IscsiLun *iscsilun;
} IscsiTask;

typedef struct IscsiAIOCB {
Expand Down Expand Up @@ -133,7 +135,7 @@ iscsi_schedule_bh(IscsiAIOCB *acb)
if (acb->bh) {
return;
}
acb->bh = qemu_bh_new(iscsi_bh_cb, acb);
acb->bh = aio_bh_new(acb->iscsilun->aio_context, iscsi_bh_cb, acb);
qemu_bh_schedule(acb->bh);
}

Expand Down Expand Up @@ -169,16 +171,18 @@ iscsi_co_generic_cb(struct iscsi_context *iscsi, int status,

out:
if (iTask->co) {
iTask->bh = qemu_bh_new(iscsi_co_generic_bh_cb, iTask);
iTask->bh = aio_bh_new(iTask->iscsilun->aio_context,
iscsi_co_generic_bh_cb, iTask);
qemu_bh_schedule(iTask->bh);
}
}

static void iscsi_co_init_iscsitask(IscsiLun *iscsilun, struct IscsiTask *iTask)
{
*iTask = (struct IscsiTask) {
.co = qemu_coroutine_self(),
.retries = ISCSI_CMD_RETRIES,
.co = qemu_coroutine_self(),
.retries = ISCSI_CMD_RETRIES,
.iscsilun = iscsilun,
};
}

Expand Down Expand Up @@ -209,7 +213,7 @@ iscsi_aio_cancel(BlockDriverAIOCB *blockacb)
iscsi_abort_task_cb, acb);

while (acb->status == -EINPROGRESS) {
qemu_aio_wait();
aio_poll(iscsilun->aio_context, true);
}
}

Expand All @@ -232,10 +236,11 @@ iscsi_set_events(IscsiLun *iscsilun)
ev = POLLIN;
ev |= iscsi_which_events(iscsi);
if (ev != iscsilun->events) {
qemu_aio_set_fd_handler(iscsi_get_fd(iscsi),
iscsi_process_read,
(ev & POLLOUT) ? iscsi_process_write : NULL,
iscsilun);
aio_set_fd_handler(iscsilun->aio_context,
iscsi_get_fd(iscsi),
iscsi_process_read,
(ev & POLLOUT) ? iscsi_process_write : NULL,
iscsilun);

}

Expand Down Expand Up @@ -791,7 +796,7 @@ static int iscsi_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
iscsi_aio_ioctl(bs, req, buf, ioctl_cb, &status);

while (status == -EINPROGRESS) {
qemu_aio_wait();
aio_poll(iscsilun->aio_context, true);
}

return 0;
Expand Down Expand Up @@ -1195,6 +1200,40 @@ static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, int lun,
return NULL;
}

static void iscsi_detach_aio_context(BlockDriverState *bs)
{
IscsiLun *iscsilun = bs->opaque;

aio_set_fd_handler(iscsilun->aio_context,
iscsi_get_fd(iscsilun->iscsi),
NULL, NULL, NULL);
iscsilun->events = 0;

if (iscsilun->nop_timer) {
timer_del(iscsilun->nop_timer);
timer_free(iscsilun->nop_timer);
iscsilun->nop_timer = NULL;
}
}

static void iscsi_attach_aio_context(BlockDriverState *bs,
AioContext *new_context)
{
IscsiLun *iscsilun = bs->opaque;

iscsilun->aio_context = new_context;
iscsi_set_events(iscsilun);

#if defined(LIBISCSI_FEATURE_NOP_COUNTER)
/* Set up a timer for sending out iSCSI NOPs */
iscsilun->nop_timer = aio_timer_new(iscsilun->aio_context,
QEMU_CLOCK_REALTIME, SCALE_MS,
iscsi_nop_timed_event, iscsilun);
timer_mod(iscsilun->nop_timer,
qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL);
#endif
}

/*
* We support iscsi url's on the form
* iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun>
Expand Down Expand Up @@ -1301,6 +1340,7 @@ static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,
}

iscsilun->iscsi = iscsi;
iscsilun->aio_context = bdrv_get_aio_context(bs);
iscsilun->lun = iscsi_url->lun;
iscsilun->has_write_same = true;

Expand Down Expand Up @@ -1374,11 +1414,7 @@ static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,
scsi_free_scsi_task(task);
task = NULL;

#if defined(LIBISCSI_FEATURE_NOP_COUNTER)
/* Set up a timer for sending out iSCSI NOPs */
iscsilun->nop_timer = timer_new_ms(QEMU_CLOCK_REALTIME, iscsi_nop_timed_event, iscsilun);
timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL);
#endif
iscsi_attach_aio_context(bs, iscsilun->aio_context);

/* Guess the internal cluster (page) size of the iscsi target by the means
* of opt_unmap_gran. Transfer the unmap granularity only if it has a
Expand Down Expand Up @@ -1422,11 +1458,7 @@ static void iscsi_close(BlockDriverState *bs)
IscsiLun *iscsilun = bs->opaque;
struct iscsi_context *iscsi = iscsilun->iscsi;

if (iscsilun->nop_timer) {
timer_del(iscsilun->nop_timer);
timer_free(iscsilun->nop_timer);
}
qemu_aio_set_fd_handler(iscsi_get_fd(iscsi), NULL, NULL, NULL);
iscsi_detach_aio_context(bs);
iscsi_destroy_context(iscsi);
g_free(iscsilun->zeroblock);
g_free(iscsilun->allocationmap);
Expand Down Expand Up @@ -1530,10 +1562,7 @@ static int iscsi_create(const char *filename, QEMUOptionParameter *options,
if (ret != 0) {
goto out;
}
if (iscsilun->nop_timer) {
timer_del(iscsilun->nop_timer);
timer_free(iscsilun->nop_timer);
}
iscsi_detach_aio_context(bs);
if (iscsilun->type != TYPE_DISK) {
ret = -ENODEV;
goto out;
Expand Down Expand Up @@ -1604,6 +1633,9 @@ static BlockDriver bdrv_iscsi = {
.bdrv_ioctl = iscsi_ioctl,
.bdrv_aio_ioctl = iscsi_aio_ioctl,
#endif

.bdrv_detach_aio_context = iscsi_detach_aio_context,
.bdrv_attach_aio_context = iscsi_attach_aio_context,
};

static QemuOptsList qemu_iscsi_opts = {
Expand Down

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