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 95 if (fse->export_flags & V9FS_SM_PASSTHROUGH) { 96 s->ctx.xops = passthrough_xattr_ops; 97 } else if (fse->export_flags & V9FS_SM_MAPPED) { 98 s->ctx.xops = mapped_xattr_ops; 99 } else if (fse->export_flags & V9FS_SM_NONE) { 100 s->ctx.xops = none_xattr_ops; 101 } 102 103 len = strlen(conf->tag); 104 if (len > MAX_TAG_LEN - 1) { 105 fprintf(stderr, "mount tag '%s' (%d bytes) is longer than " 106 "maximum (%d bytes)", conf->tag, len, MAX_TAG_LEN - 1); 107 exit(1); 108 } 109 110 s->tag = strdup(conf->tag); 111 s->ctx.uid = -1; 112 113 s->ops = fse->ops; 114 s->vdev.get_features = virtio_9p_get_features; 115 s->config_size = sizeof(struct virtio_9p_config) + len; 116 s->vdev.get_config = virtio_9p_get_config; 117 s->fid_list = NULL; 118 qemu_co_rwlock_init(&s->rename_lock); 119 120 if (s->ops->init(&s->ctx) < 0) { 121 fprintf(stderr, "Virtio-9p Failed to initialize fs-driver with id:%s" 122 " and export path:%s\n", conf->fsdev_id, s->ctx.fs_root); 123 exit(1); 124 } 125 if (v9fs_init_worker_threads() < 0) { 126 fprintf(stderr, "worker thread initialization failed\n"); 127 exit(1); 128 } 129 130 /* 131 * Check details of export path, We need to use fs driver 132 * call back to do that. Since we are in the init path, we don't 133 * use co-routines here. 134 */ 135 v9fs_path_init(&path); 136 if (s->ops->name_to_path(&s->ctx, NULL, "/", &path) < 0) { 137 fprintf(stderr, 138 "error in converting name to path %s", strerror(errno)); 139 exit(1); 140 } 141 if (s->ops->lstat(&s->ctx, &path, &stat)) { 142 fprintf(stderr, "share path %s does not exist\n", fse->path); 143 exit(1); 144 } else if (!S_ISDIR(stat.st_mode)) { 145 fprintf(stderr, "share path %s is not a directory\n", fse->path); 146 exit(1); 147 } 148 v9fs_path_free(&path); 149 150 return &s->vdev; 151 } 152 153 static int virtio_9p_init_pci(PCIDevice *pci_dev) 154 { 155 VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); 156 VirtIODevice *vdev; 157 158 vdev = virtio_9p_init(&pci_dev->qdev, &proxy->fsconf); 159 vdev->nvectors = proxy->nvectors; 160 virtio_init_pci(proxy, vdev); 161 /* make the actual value visible */ 162 proxy->nvectors = vdev->nvectors; 163 return 0; 164 } 165 166 static PCIDeviceInfo virtio_9p_info = { 167 .qdev.name = "virtio-9p-pci", 168 .qdev.size = sizeof(VirtIOPCIProxy), 169 .init = virtio_9p_init_pci, 170 .vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET, 171 .device_id = 0x1009, 172 .revision = VIRTIO_PCI_ABI_VERSION, 173 .class_id = 0x2, 174 .qdev.props = (Property[]) { 175 DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags, 176 VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true), 177 DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2), 178 DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features), 179 DEFINE_PROP_STRING("mount_tag", VirtIOPCIProxy, fsconf.tag), 180 DEFINE_PROP_STRING("fsdev", VirtIOPCIProxy, fsconf.fsdev_id), 181 DEFINE_PROP_END_OF_LIST(), 182 }, 183 .qdev.reset = virtio_pci_reset, 184 }; 185 186 static void virtio_9p_register_devices(void) 187 { 188 pci_qdev_register(&virtio_9p_info); 189 virtio_9p_set_fd_limit(); 190 } 191 192 device_init(virtio_9p_register_devices) 193