static int blk_connect(struct XenDevice *xendev) { struct XenBlkDev *blkdev = container_of(xendev, struct XenBlkDev, xendev); int pers, index, qflags; bool readonly = true; /* read-only ? */ if (blkdev->directiosafe) { qflags = BDRV_O_NOCACHE | BDRV_O_NATIVE_AIO; } else { qflags = BDRV_O_CACHE_WB; } if (strcmp(blkdev->mode, "w") == 0) { qflags |= BDRV_O_RDWR; readonly = false; } if (blkdev->feature_discard) { qflags |= BDRV_O_UNMAP; } /* init qemu block driver */ index = (blkdev->xendev.dev - 202 * 256) / 16; blkdev->dinfo = drive_get(IF_XEN, 0, index); if (!blkdev->dinfo) { Error *local_err = NULL; /* setup via xenbus -> create new block driver instance */ xen_be_printf(&blkdev->xendev, 2, "create new bdrv (xenbus setup)\n"); blkdev->bs = bdrv_new(blkdev->dev, &local_err); if (local_err) { blkdev->bs = NULL; } if (blkdev->bs) { BlockDriver *drv = bdrv_find_whitelisted_format(blkdev->fileproto, readonly); if (bdrv_open(&blkdev->bs, blkdev->filename, NULL, NULL, qflags, drv, &local_err) != 0) { xen_be_printf(&blkdev->xendev, 0, "error: %s\n", error_get_pretty(local_err)); error_free(local_err); bdrv_unref(blkdev->bs); blkdev->bs = NULL; } } if (!blkdev->bs) { return -1; } } else { /* setup via qemu cmdline -> already setup for us */ xen_be_printf(&blkdev->xendev, 2, "get configured bdrv (cmdline setup)\n"); blkdev->bs = blkdev->dinfo->bdrv; if (bdrv_is_read_only(blkdev->bs) && !readonly) { xen_be_printf(&blkdev->xendev, 0, "Unexpected read-only drive"); blkdev->bs = NULL; return -1; } /* blkdev->bs is not create by us, we get a reference * so we can bdrv_unref() unconditionally */ bdrv_ref(blkdev->bs); } bdrv_attach_dev_nofail(blkdev->bs, blkdev); blkdev->file_size = bdrv_getlength(blkdev->bs); if (blkdev->file_size < 0) { xen_be_printf(&blkdev->xendev, 1, "bdrv_getlength: %d (%s) | drv %s\n", (int)blkdev->file_size, strerror(-blkdev->file_size), bdrv_get_format_name(blkdev->bs) ?: "-"); blkdev->file_size = 0; } xen_be_printf(xendev, 1, "type \"%s\", fileproto \"%s\", filename \"%s\"," " size %" PRId64 " (%" PRId64 " MB)\n", blkdev->type, blkdev->fileproto, blkdev->filename, blkdev->file_size, blkdev->file_size >> 20); /* Fill in number of sector size and number of sectors */ xenstore_write_be_int(&blkdev->xendev, "sector-size", blkdev->file_blk); xenstore_write_be_int64(&blkdev->xendev, "sectors", blkdev->file_size / blkdev->file_blk); if (xenstore_read_fe_int(&blkdev->xendev, "ring-ref", &blkdev->ring_ref) == -1) { return -1; } if (xenstore_read_fe_int(&blkdev->xendev, "event-channel", &blkdev->xendev.remote_port) == -1) { return -1; } if (xenstore_read_fe_int(&blkdev->xendev, "feature-persistent", &pers)) { blkdev->feature_persistent = FALSE; } else { blkdev->feature_persistent = !!pers; } blkdev->protocol = BLKIF_PROTOCOL_NATIVE; if (blkdev->xendev.protocol) { if (strcmp(blkdev->xendev.protocol, XEN_IO_PROTO_ABI_X86_32) == 0) { blkdev->protocol = BLKIF_PROTOCOL_X86_32; } if (strcmp(blkdev->xendev.protocol, XEN_IO_PROTO_ABI_X86_64) == 0) { blkdev->protocol = BLKIF_PROTOCOL_X86_64; } } blkdev->sring = xc_gnttab_map_grant_ref(blkdev->xendev.gnttabdev, blkdev->xendev.dom, blkdev->ring_ref, PROT_READ | PROT_WRITE); if (!blkdev->sring) { return -1; } blkdev->cnt_map++; switch (blkdev->protocol) { case BLKIF_PROTOCOL_NATIVE: { blkif_sring_t *sring_native = blkdev->sring; BACK_RING_INIT(&blkdev->rings.native, sring_native, XC_PAGE_SIZE); break; } case BLKIF_PROTOCOL_X86_32: { blkif_x86_32_sring_t *sring_x86_32 = blkdev->sring; BACK_RING_INIT(&blkdev->rings.x86_32_part, sring_x86_32, XC_PAGE_SIZE); break; } case BLKIF_PROTOCOL_X86_64: { blkif_x86_64_sring_t *sring_x86_64 = blkdev->sring; BACK_RING_INIT(&blkdev->rings.x86_64_part, sring_x86_64, XC_PAGE_SIZE); break; } } if (blkdev->feature_persistent) { /* Init persistent grants */ blkdev->max_grants = max_requests * BLKIF_MAX_SEGMENTS_PER_REQUEST; blkdev->persistent_gnts = g_tree_new_full((GCompareDataFunc)int_cmp, NULL, NULL, (GDestroyNotify)destroy_grant); blkdev->persistent_gnt_count = 0; } xen_be_bind_evtchn(&blkdev->xendev); xen_be_printf(&blkdev->xendev, 1, "ok: proto %s, ring-ref %d, " "remote port %d, local port %d\n", blkdev->xendev.protocol, blkdev->ring_ref, blkdev->xendev.remote_port, blkdev->xendev.local_port); return 0; }