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block: introduce BDRV_POLL_WHILE

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We want the BDS event loop to run exclusively in the iothread that
owns the BDS's AioContext.  This macro will provide the synchronization
between the two event loops; for now it just wraps the common idiom
of a while loop around aio_poll.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Message-Id: <1477565348-5458-8-git-send-email-pbonzini@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-10-27 12:48:55 +02:00 • committed by Fam Zheng
parent 6653a73d12
commit 88b062c203
4 changed files with 19 additions and 50 deletions
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16
block/qed-table.c
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@ -174,9 +174,7 @@ int qed_read_l1_table_sync(BDRVQEDState *s)
qed_read_table(s, s->header.l1_table_offset,
s->l1_table, qed_sync_cb, &ret);
while (ret == -EINPROGRESS) {
aio_poll(bdrv_get_aio_context(s->bs), true);
}
BDRV_POLL_WHILE(s->bs, ret == -EINPROGRESS);
return ret;
}
@ -195,9 +193,7 @@ int qed_write_l1_table_sync(BDRVQEDState *s, unsigned int index,
int ret = -EINPROGRESS;
qed_write_l1_table(s, index, n, qed_sync_cb, &ret);
while (ret == -EINPROGRESS) {
aio_poll(bdrv_get_aio_context(s->bs), true);
}
BDRV_POLL_WHILE(s->bs, ret == -EINPROGRESS);
return ret;
}
@ -268,9 +264,7 @@ int qed_read_l2_table_sync(BDRVQEDState *s, QEDRequest *request, uint64_t offset
int ret = -EINPROGRESS;
qed_read_l2_table(s, request, offset, qed_sync_cb, &ret);
while (ret == -EINPROGRESS) {
aio_poll(bdrv_get_aio_context(s->bs), true);
}
BDRV_POLL_WHILE(s->bs, ret == -EINPROGRESS);
return ret;
}
@ -290,9 +284,7 @@ int qed_write_l2_table_sync(BDRVQEDState *s, QEDRequest *request,
int ret = -EINPROGRESS;
qed_write_l2_table(s, request, index, n, flush, qed_sync_cb, &ret);
while (ret == -EINPROGRESS) {
aio_poll(bdrv_get_aio_context(s->bs), true);
}
BDRV_POLL_WHILE(s->bs, ret == -EINPROGRESS);
return ret;
}