fix raw_aio_read\write error handling (Stefano Stabellini)
Currently when qemu_paio_read or qemu_paio_write return an error we call qemu_aio_release without removing the request from the list. I know that in the current implementation qemu_paio_write\read don't return any error, but still the behavior is wrong, especially considering that the implementation of these two functions is likely to change in is the future. This patch fixes the problem adding a raw_aio_remove function that removes the callback from the queue and also calls qemu_aio_release. raw_aio_remove is called by raw_aio_read, raw_aio_write and raw_aio_cancel. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6470 c046a42c-6fe2-441c-8c8c-71466251a162
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@ -598,6 +598,24 @@ static void raw_aio_em_cb(void* opaque)
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qemu_aio_release(acb);
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qemu_aio_release(acb);
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}
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}
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static void raw_aio_remove(RawAIOCB *acb)
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{
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RawAIOCB **pacb;
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/* remove the callback from the queue */
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pacb = &posix_aio_state->first_aio;
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for(;;) {
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if (*pacb == NULL) {
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break;
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} else if (*pacb == acb) {
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*pacb = acb->next;
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qemu_aio_release(acb);
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break;
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}
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pacb = &acb->next;
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}
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}
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static BlockDriverAIOCB *raw_aio_read(BlockDriverState *bs,
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static BlockDriverAIOCB *raw_aio_read(BlockDriverState *bs,
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int64_t sector_num, uint8_t *buf, int nb_sectors,
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int64_t sector_num, uint8_t *buf, int nb_sectors,
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BlockDriverCompletionFunc *cb, void *opaque)
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BlockDriverCompletionFunc *cb, void *opaque)
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@ -623,7 +641,7 @@ static BlockDriverAIOCB *raw_aio_read(BlockDriverState *bs,
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if (!acb)
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if (!acb)
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return NULL;
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return NULL;
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if (qemu_paio_read(&acb->aiocb) < 0) {
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if (qemu_paio_read(&acb->aiocb) < 0) {
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qemu_aio_release(acb);
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raw_aio_remove(acb);
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return NULL;
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return NULL;
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}
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}
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return &acb->common;
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return &acb->common;
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@ -654,7 +672,7 @@ static BlockDriverAIOCB *raw_aio_write(BlockDriverState *bs,
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if (!acb)
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if (!acb)
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return NULL;
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return NULL;
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if (qemu_paio_write(&acb->aiocb) < 0) {
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if (qemu_paio_write(&acb->aiocb) < 0) {
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qemu_aio_release(acb);
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raw_aio_remove(acb);
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return NULL;
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return NULL;
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}
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}
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return &acb->common;
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return &acb->common;
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@ -664,7 +682,6 @@ static void raw_aio_cancel(BlockDriverAIOCB *blockacb)
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{
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{
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int ret;
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int ret;
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RawAIOCB *acb = (RawAIOCB *)blockacb;
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RawAIOCB *acb = (RawAIOCB *)blockacb;
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RawAIOCB **pacb;
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ret = qemu_paio_cancel(acb->aiocb.aio_fildes, &acb->aiocb);
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ret = qemu_paio_cancel(acb->aiocb.aio_fildes, &acb->aiocb);
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if (ret == QEMU_PAIO_NOTCANCELED) {
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if (ret == QEMU_PAIO_NOTCANCELED) {
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@ -673,18 +690,7 @@ static void raw_aio_cancel(BlockDriverAIOCB *blockacb)
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while (qemu_paio_error(&acb->aiocb) == EINPROGRESS);
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while (qemu_paio_error(&acb->aiocb) == EINPROGRESS);
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}
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}
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/* remove the callback from the queue */
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raw_aio_remove(acb);
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pacb = &posix_aio_state->first_aio;
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for(;;) {
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if (*pacb == NULL) {
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break;
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} else if (*pacb == acb) {
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*pacb = acb->next;
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qemu_aio_release(acb);
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break;
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}
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pacb = &acb->next;
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}
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}
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}
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#else /* CONFIG_AIO */
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#else /* CONFIG_AIO */
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static int posix_aio_init(void)
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static int posix_aio_init(void)
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