curl: do not do aio_poll when waiting for a free CURLState
Instead, put the CURLAIOCB on a wait list and yield; curl_clean_state will wake the corresponding coroutine. Because of CURL's callback-based structure, we cannot easily convert everything to CoMutex/CoQueue; keeping the QemuMutex is simpler. However, CoQueue is a simple wrapper around a linked list, so we can easily use QSIMPLEQ and open-code a CoQueue, protected by the BDRVCURLState QemuMutex instead of a CoMutex. Reviewed-by: Jeff Cody <jcody@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Message-id: 20170515100059.15795-8-pbonzini@redhat.com Signed-off-by: Jeff Cody <jcody@redhat.com>
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16
block/curl.c
16
block/curl.c
@ -99,6 +99,8 @@ typedef struct CURLAIOCB {
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size_t start;
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size_t end;
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QSIMPLEQ_ENTRY(CURLAIOCB) next;
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} CURLAIOCB;
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typedef struct CURLSocket {
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@ -134,6 +136,7 @@ typedef struct BDRVCURLState {
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bool accept_range;
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AioContext *aio_context;
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QemuMutex mutex;
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QSIMPLEQ_HEAD(, CURLAIOCB) free_state_waitq;
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char *username;
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char *password;
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char *proxyusername;
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@ -533,6 +536,7 @@ static int curl_init_state(BDRVCURLState *s, CURLState *state)
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/* Called with s->mutex held. */
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static void curl_clean_state(CURLState *s)
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{
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CURLAIOCB *next;
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int j;
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for (j = 0; j < CURL_NUM_ACB; j++) {
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assert(!s->acb[j]);
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@ -549,6 +553,14 @@ static void curl_clean_state(CURLState *s)
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}
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s->in_use = 0;
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next = QSIMPLEQ_FIRST(&s->s->free_state_waitq);
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if (next) {
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QSIMPLEQ_REMOVE_HEAD(&s->s->free_state_waitq, next);
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qemu_mutex_unlock(&s->s->mutex);
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aio_co_wake(next->co);
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qemu_mutex_lock(&s->s->mutex);
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}
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}
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static void curl_parse_filename(const char *filename, QDict *options,
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@ -766,6 +778,7 @@ static int curl_open(BlockDriverState *bs, QDict *options, int flags,
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}
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DPRINTF("CURL: Opening %s\n", file);
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QSIMPLEQ_INIT(&s->free_state_waitq);
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s->aio_context = bdrv_get_aio_context(bs);
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s->url = g_strdup(file);
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qemu_mutex_lock(&s->mutex);
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@ -866,8 +879,9 @@ static void curl_setup_preadv(BlockDriverState *bs, CURLAIOCB *acb)
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if (state) {
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break;
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}
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QSIMPLEQ_INSERT_TAIL(&s->free_state_waitq, acb, next);
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qemu_mutex_unlock(&s->mutex);
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aio_poll(bdrv_get_aio_context(bs), true);
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qemu_coroutine_yield();
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qemu_mutex_lock(&s->mutex);
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}
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