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/virtio.h" 15 #include "hw/virtio/virtio-9p.h" 16 #include "hw/i386/pc.h" 17 #include "qemu/sockets.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 static int virtio_9p_device_init(VirtIODevice *vdev) 50 { 51 V9fsState *s = VIRTIO_9P(vdev); 52 int i, len; 53 struct stat stat; 54 FsDriverEntry *fse; 55 V9fsPath path; 56 57 virtio_init(VIRTIO_DEVICE(s), "virtio-9p", VIRTIO_ID_9P, 58 sizeof(struct virtio_9p_config) + MAX_TAG_LEN); 59 60 /* initialize pdu allocator */ 61 QLIST_INIT(&s->free_list); 62 QLIST_INIT(&s->active_list); 63 for (i = 0; i < (MAX_REQ - 1); i++) { 64 QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next); 65 } 66 67 s->vq = virtio_add_queue(vdev, MAX_REQ, handle_9p_output); 68 69 fse = get_fsdev_fsentry(s->fsconf.fsdev_id); 70 71 if (!fse) { 72 /* We don't have a fsdev identified by fsdev_id */ 73 fprintf(stderr, "Virtio-9p device couldn't find fsdev with the " 74 "id = %s\n", 75 s->fsconf.fsdev_id ? s->fsconf.fsdev_id : "NULL"); 76 return -1; 77 } 78 79 if (!s->fsconf.tag) { 80 /* we haven't specified a mount_tag */ 81 fprintf(stderr, "fsdev with id %s needs mount_tag arguments\n", 82 s->fsconf.fsdev_id); 83 return -1; 84 } 85 86 s->ctx.export_flags = fse->export_flags; 87 s->ctx.fs_root = g_strdup(fse->path); 88 s->ctx.exops.get_st_gen = NULL; 89 len = strlen(s->fsconf.tag); 90 if (len > MAX_TAG_LEN - 1) { 91 fprintf(stderr, "mount tag '%s' (%d bytes) is longer than " 92 "maximum (%d bytes)", s->fsconf.tag, len, MAX_TAG_LEN - 1); 93 return -1; 94 } 95 96 s->tag = strdup(s->fsconf.tag); 97 s->ctx.uid = -1; 98 99 s->ops = fse->ops; 100 s->vdev.get_features = virtio_9p_get_features; 101 s->config_size = sizeof(struct virtio_9p_config) + len; 102 s->vdev.get_config = virtio_9p_get_config; 103 s->fid_list = NULL; 104 qemu_co_rwlock_init(&s->rename_lock); 105 106 if (s->ops->init(&s->ctx) < 0) { 107 fprintf(stderr, "Virtio-9p Failed to initialize fs-driver with id:%s" 108 " and export path:%s\n", s->fsconf.fsdev_id, s->ctx.fs_root); 109 return -1; 110 } 111 if (v9fs_init_worker_threads() < 0) { 112 fprintf(stderr, "worker thread initialization failed\n"); 113 return -1; 114 } 115 116 /* 117 * Check details of export path, We need to use fs driver 118 * call back to do that. Since we are in the init path, we don't 119 * use co-routines here. 120 */ 121 v9fs_path_init(&path); 122 if (s->ops->name_to_path(&s->ctx, NULL, "/", &path) < 0) { 123 fprintf(stderr, 124 "error in converting name to path %s", strerror(errno)); 125 return -1; 126 } 127 if (s->ops->lstat(&s->ctx, &path, &stat)) { 128 fprintf(stderr, "share path %s does not exist\n", fse->path); 129 return -1; 130 } else if (!S_ISDIR(stat.st_mode)) { 131 fprintf(stderr, "share path %s is not a directory\n", fse->path); 132 return -1; 133 } 134 v9fs_path_free(&path); 135 136 return 0; 137 } 138 139 /* virtio-9p device */ 140 141 static Property virtio_9p_properties[] = { 142 DEFINE_VIRTIO_9P_PROPERTIES(V9fsState, fsconf), 143 DEFINE_PROP_END_OF_LIST(), 144 }; 145 146 static void virtio_9p_class_init(ObjectClass *klass, void *data) 147 { 148 DeviceClass *dc = DEVICE_CLASS(klass); 149 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 150 dc->props = virtio_9p_properties; 151 vdc->init = virtio_9p_device_init; 152 vdc->get_features = virtio_9p_get_features; 153 vdc->get_config = virtio_9p_get_config; 154 } 155 156 static const TypeInfo virtio_device_info = { 157 .name = TYPE_VIRTIO_9P, 158 .parent = TYPE_VIRTIO_DEVICE, 159 .instance_size = sizeof(V9fsState), 160 .class_init = virtio_9p_class_init, 161 }; 162 163 static void virtio_9p_register_types(void) 164 { 165 type_register_static(&virtio_device_info); 166 } 167 168 type_init(virtio_9p_register_types) 169