74 lines
2.1 KiB
Diff
74 lines
2.1 KiB
Diff
Index: xen-3.3.0-testing/tools/ioemu/hw/xen_blktap.c
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===================================================================
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--- xen-3.3.0-testing.orig/tools/ioemu/hw/xen_blktap.c
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+++ xen-3.3.0-testing/tools/ioemu/hw/xen_blktap.c
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@@ -349,6 +349,15 @@ static void qemu_send_responses(void* op
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}
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/**
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+ * Callback function for AIO flush
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+ */
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+static void qemu_flush_response(void* opaque, int ret) {
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+ if (ret != 0) {
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+ DPRINTF("aio_flush: ret = %d (%s)\n", ret, strerror(-ret));
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+ }
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+}
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+
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+/**
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* Callback function for the IO message pipe. Reads requests from the ring
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* and processes them (call qemu read/write functions).
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*
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@@ -367,6 +376,7 @@ static void handle_blktap_iomsg(void* pr
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blkif_t *blkif = s->blkif;
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tapdev_info_t *info = s->ring_info;
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int page_size = getpagesize();
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+ int sync;
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struct aiocb_info *aiocb_info;
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@@ -399,7 +409,7 @@ static void handle_blktap_iomsg(void* pr
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/* Don't allow writes on readonly devices */
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if ((s->flags & TD_RDONLY) &&
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- (req->operation == BLKIF_OP_WRITE)) {
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+ (req->operation != BLKIF_OP_READ)) {
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blkif->pending_list[idx].status = BLKIF_RSP_ERROR;
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goto send_response;
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}
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@@ -420,7 +430,7 @@ static void handle_blktap_iomsg(void* pr
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DPRINTF("Sector request failed:\n");
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DPRINTF("%s request, idx [%d,%d] size [%llu], "
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"sector [%llu,%llu]\n",
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- (req->operation == BLKIF_OP_WRITE ?
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+ (req->operation != BLKIF_OP_READ ?
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"WRITE" : "READ"),
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idx,i,
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(long long unsigned)
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@@ -433,8 +443,14 @@ static void handle_blktap_iomsg(void* pr
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blkif->pending_list[idx].secs_pending += nsects;
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- switch (req->operation)
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+ sync = 0;
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+ switch (req->operation)
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{
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+ case BLKIF_OP_WRITE_BARRIER:
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+ sync = 1;
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+ bdrv_aio_flush(s->bs, qemu_flush_response, NULL);
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+ /* fall through */
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+
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case BLKIF_OP_WRITE:
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aiocb_info = malloc(sizeof(*aiocb_info));
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@@ -454,6 +470,10 @@ static void handle_blktap_iomsg(void* pr
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DPRINTF("ERROR: bdrv_write() == NULL\n");
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goto send_response;
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}
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+
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+ if (sync)
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+ bdrv_aio_flush(s->bs, qemu_flush_response, NULL);
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+
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break;
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case BLKIF_OP_READ:
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