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block/curl: Don't finish AIOCBs too early 

The previous behaviour was to finish AIOCBs inside curl_aio_readv()
if the data was cached. This caused the following failed assertion
at hw/ide/pci.c:314: bmdma_cmd_writeb

"Assertion `bm->bus->dma->aiocb == ((void *)0)' failed."

By scheduling a QEMUBH and performing the completion inside the
callback, we avoid this problem.

Signed-off-by: Nick Thomas <nick@bytemark.co.uk>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Nick Thomas 2011-09-21 11:55:50 +01:00 committed by Kevin Wolf
parent c84dcdc1d6
commit 363c3c8535
1 changed files with 49 additions and 19 deletions
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68
block/curl.c
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@ -47,7 +47,12 @@ struct BDRVCURLState;
typedef struct CURLAIOCB {
BlockDriverAIOCB common;
QEMUBH *bh;
QEMUIOVector *qiov;
int64_t sector_num;
int nb_sectors;
size_t start;
size_t end;
} CURLAIOCB;
@ -440,43 +445,42 @@ static AIOPool curl_aio_pool = {
.cancel = curl_aio_cancel,
};
static BlockDriverAIOCB *curl_aio_readv(BlockDriverState *bs,
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
BlockDriverCompletionFunc *cb, void *opaque)
static void curl_readv_bh_cb(void *p)
{
BDRVCURLState *s = bs->opaque;
CURLAIOCB *acb;
size_t start = sector_num * SECTOR_SIZE;
size_t end;
CURLState *state;
acb = qemu_aio_get(&curl_aio_pool, bs, cb, opaque);
if (!acb)
return NULL;
CURLAIOCB *acb = p;
BDRVCURLState *s = acb->common.bs->opaque;
acb->qiov = qiov;
qemu_bh_delete(acb->bh);
acb->bh = NULL;
size_t start = acb->sector_num * SECTOR_SIZE;
size_t end;
// In case we have the requested data already (e.g. read-ahead),
// we can just call the callback and be done.
switch (curl_find_buf(s, start, nb_sectors * SECTOR_SIZE, acb)) {
switch (curl_find_buf(s, start, acb->nb_sectors * SECTOR_SIZE, acb)) {
case FIND_RET_OK:
qemu_aio_release(acb);
// fall through
case FIND_RET_WAIT:
return &acb->common;
return;
default:
break;
}
// No cache found, so let's start a new request
state = curl_init_state(s);
if (!state)
return NULL;
if (!state) {
acb->common.cb(acb->common.opaque, -EIO);
qemu_aio_release(acb);
return;
}
acb->start = 0;
acb->end = (nb_sectors * SECTOR_SIZE);
acb->end = (acb->nb_sectors * SECTOR_SIZE);
state->buf_off = 0;
if (state->orig_buf)
@ -489,12 +493,38 @@ static BlockDriverAIOCB *curl_aio_readv(BlockDriverState *bs,
snprintf(state->range, 127, "%zd-%zd", start, end);
DPRINTF("CURL (AIO): Reading %d at %zd (%s)\n",
(nb_sectors * SECTOR_SIZE), start, state->range);
(acb->nb_sectors * SECTOR_SIZE), start, state->range);
curl_easy_setopt(state->curl, CURLOPT_RANGE, state->range);
curl_multi_add_handle(s->multi, state->curl);
curl_multi_do(s);
}
static BlockDriverAIOCB *curl_aio_readv(BlockDriverState *bs,
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
BlockDriverCompletionFunc *cb, void *opaque)
{
CURLAIOCB *acb;
acb = qemu_aio_get(&curl_aio_pool, bs, cb, opaque);
if (!acb) {
return NULL;
}
acb->qiov = qiov;
acb->sector_num = sector_num;
acb->nb_sectors = nb_sectors;
acb->bh = qemu_bh_new(curl_readv_bh_cb, acb);
if (!acb->bh) {
DPRINTF("CURL: qemu_bh_new failed\n");
return NULL;
}
qemu_bh_schedule(acb->bh);
return &acb->common;
}