1 /* 2 * Virtio 9p backend 3 * 4 * Copyright IBM, Corp. 2010 5 * 6 * Authors: 7 * Anthony Liguori <aliguori@us.ibm.com> 8 * 9 * This work is licensed under the terms of the GNU GPL, version 2. See 10 * the COPYING file in the top-level directory. 11 * 12 */ 13 14 #include "hw/virtio.h" 15 #include "hw/pc.h" 16 #include "qemu_socket.h" 17 #include "hw/virtio-pci.h" 18 #include "virtio-9p.h" 19 #include "fsdev/qemu-fsdev.h" 20 #include "virtio-9p-xattr.h" 21 #include "virtio-9p-coth.h" 22 23 static uint32_t virtio_9p_get_features(VirtIODevice *vdev, uint32_t features) 24 { 25 features |= 1 << VIRTIO_9P_MOUNT_TAG; 26 return features; 27 } 28 29 static V9fsState *to_virtio_9p(VirtIODevice *vdev) 30 { 31 return (V9fsState *)vdev; 32 } 33 34 static void virtio_9p_get_config(VirtIODevice *vdev, uint8_t *config) 35 { 36 int len; 37 struct virtio_9p_config *cfg; 38 V9fsState *s = to_virtio_9p(vdev); 39 40 len = strlen(s->tag); 41 cfg = g_malloc0(sizeof(struct virtio_9p_config) + len); 42 stw_raw(&cfg->tag_len, len); 43 /* We don't copy the terminating null to config space */ 44 memcpy(cfg->tag, s->tag, len); 45 memcpy(config, cfg, s->config_size); 46 g_free(cfg); 47 } 48 49 VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf *conf) 50 { 51 V9fsState *s; 52 int i, len; 53 struct stat stat; 54 FsDriverEntry *fse; 55 V9fsPath path; 56 57 s = (V9fsState *)virtio_common_init("virtio-9p", 58 VIRTIO_ID_9P, 59 sizeof(struct virtio_9p_config)+ 60 MAX_TAG_LEN, 61 sizeof(V9fsState)); 62 /* initialize pdu allocator */ 63 QLIST_INIT(&s->free_list); 64 QLIST_INIT(&s->active_list); 65 for (i = 0; i < (MAX_REQ - 1); i++) { 66 QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next); 67 } 68 69 s->vq = virtio_add_queue(&s->vdev, MAX_REQ, handle_9p_output); 70 71 fse = get_fsdev_fsentry(conf->fsdev_id); 72 73 if (!fse) { 74 /* We don't have a fsdev identified by fsdev_id */ 75 fprintf(stderr, "Virtio-9p device couldn't find fsdev with the " 76 "id = %s\n", conf->fsdev_id ? conf->fsdev_id : "NULL"); 77 exit(1); 78 } 79 80 if (!conf->tag) { 81 /* we haven't specified a mount_tag */ 82 fprintf(stderr, "fsdev with id %s needs mount_tag arguments\n", 83 conf->fsdev_id); 84 exit(1); 85 } 86 87 s->ctx.export_flags = fse->export_flags; 88 if (fse->path) { 89 s->ctx.fs_root = g_strdup(fse->path); 90 } else { 91 s->ctx.fs_root = NULL; 92 } 93 s->ctx.exops.get_st_gen = NULL; 94 len = strlen(conf->tag); 95 if (len > MAX_TAG_LEN - 1) { 96 fprintf(stderr, "mount tag '%s' (%d bytes) is longer than " 97 "maximum (%d bytes)", conf->tag, len, MAX_TAG_LEN - 1); 98 exit(1); 99 } 100 101 s->tag = strdup(conf->tag); 102 s->ctx.uid = -1; 103 104 s->ops = fse->ops; 105 s->vdev.get_features = virtio_9p_get_features; 106 s->config_size = sizeof(struct virtio_9p_config) + len; 107 s->vdev.get_config = virtio_9p_get_config; 108 s->fid_list = NULL; 109 qemu_co_rwlock_init(&s->rename_lock); 110 111 if (s->ops->init(&s->ctx) < 0) { 112 fprintf(stderr, "Virtio-9p Failed to initialize fs-driver with id:%s" 113 " and export path:%s\n", conf->fsdev_id, s->ctx.fs_root); 114 exit(1); 115 } 116 if (v9fs_init_worker_threads() < 0) { 117 fprintf(stderr, "worker thread initialization failed\n"); 118 exit(1); 119 } 120 121 /* 122 * Check details of export path, We need to use fs driver 123 * call back to do that. Since we are in the init path, we don't 124 * use co-routines here. 125 */ 126 v9fs_path_init(&path); 127 if (s->ops->name_to_path(&s->ctx, NULL, "/", &path) < 0) { 128 fprintf(stderr, 129 "error in converting name to path %s", strerror(errno)); 130 exit(1); 131 } 132 if (s->ops->lstat(&s->ctx, &path, &stat)) { 133 fprintf(stderr, "share path %s does not exist\n", fse->path); 134 exit(1); 135 } else if (!S_ISDIR(stat.st_mode)) { 136 fprintf(stderr, "share path %s is not a directory\n", fse->path); 137 exit(1); 138 } 139 v9fs_path_free(&path); 140 141 return &s->vdev; 142 } 143 144 static int virtio_9p_init_pci(PCIDevice *pci_dev) 145 { 146 VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); 147 VirtIODevice *vdev; 148 149 vdev = virtio_9p_init(&pci_dev->qdev, &proxy->fsconf); 150 vdev->nvectors = proxy->nvectors; 151 virtio_init_pci(proxy, vdev); 152 /* make the actual value visible */ 153 proxy->nvectors = vdev->nvectors; 154 return 0; 155 } 156 157 static Property virtio_9p_properties[] = { 158 DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags, VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true), 159 DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2), 160 DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features), 161 DEFINE_PROP_STRING("mount_tag", VirtIOPCIProxy, fsconf.tag), 162 DEFINE_PROP_STRING("fsdev", VirtIOPCIProxy, fsconf.fsdev_id), 163 DEFINE_PROP_END_OF_LIST(), 164 }; 165 166 static void virtio_9p_class_init(ObjectClass *klass, void *data) 167 { 168 DeviceClass *dc = DEVICE_CLASS(klass); 169 PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); 170 171 k->init = virtio_9p_init_pci; 172 k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET; 173 k->device_id = 0x1009; 174 k->revision = VIRTIO_PCI_ABI_VERSION; 175 k->class_id = 0x2; 176 dc->props = virtio_9p_properties; 177 dc->reset = virtio_pci_reset; 178 } 179 180 static TypeInfo virtio_9p_info = { 181 .name = "virtio-9p-pci", 182 .parent = TYPE_PCI_DEVICE, 183 .instance_size = sizeof(VirtIOPCIProxy), 184 .class_init = virtio_9p_class_init, 185 }; 186 187 static void virtio_9p_register_types(void) 188 { 189 type_register_static(&virtio_9p_info); 190 virtio_9p_set_fd_limit(); 191 } 192 193 type_init(virtio_9p_register_types) 194