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 void virtio_9p_get_config(VirtIODevice *vdev, uint8_t *config) 30 { 31 int len; 32 struct virtio_9p_config *cfg; 33 V9fsState *s = VIRTIO_9P(vdev); 34 35 len = strlen(s->tag); 36 cfg = g_malloc0(sizeof(struct virtio_9p_config) + len); 37 stw_raw(&cfg->tag_len, len); 38 /* We don't copy the terminating null to config space */ 39 memcpy(cfg->tag, s->tag, len); 40 memcpy(config, cfg, s->config_size); 41 g_free(cfg); 42 } 43 44 static int virtio_9p_device_init(VirtIODevice *vdev) 45 { 46 V9fsState *s = VIRTIO_9P(vdev); 47 int i, len; 48 struct stat stat; 49 FsDriverEntry *fse; 50 V9fsPath path; 51 52 virtio_init(VIRTIO_DEVICE(s), "virtio-9p", VIRTIO_ID_9P, 53 sizeof(struct virtio_9p_config) + MAX_TAG_LEN); 54 55 /* initialize pdu allocator */ 56 QLIST_INIT(&s->free_list); 57 QLIST_INIT(&s->active_list); 58 for (i = 0; i < (MAX_REQ - 1); i++) { 59 QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next); 60 } 61 62 s->vq = virtio_add_queue(vdev, MAX_REQ, handle_9p_output); 63 64 fse = get_fsdev_fsentry(s->fsconf.fsdev_id); 65 66 if (!fse) { 67 /* We don't have a fsdev identified by fsdev_id */ 68 fprintf(stderr, "Virtio-9p device couldn't find fsdev with the " 69 "id = %s\n", 70 s->fsconf.fsdev_id ? s->fsconf.fsdev_id : "NULL"); 71 goto out; 72 } 73 74 if (!s->fsconf.tag) { 75 /* we haven't specified a mount_tag */ 76 fprintf(stderr, "fsdev with id %s needs mount_tag arguments\n", 77 s->fsconf.fsdev_id); 78 goto out; 79 } 80 81 s->ctx.export_flags = fse->export_flags; 82 s->ctx.fs_root = g_strdup(fse->path); 83 s->ctx.exops.get_st_gen = NULL; 84 len = strlen(s->fsconf.tag); 85 if (len > MAX_TAG_LEN - 1) { 86 fprintf(stderr, "mount tag '%s' (%d bytes) is longer than " 87 "maximum (%d bytes)", s->fsconf.tag, len, MAX_TAG_LEN - 1); 88 goto out; 89 } 90 91 s->tag = g_strdup(s->fsconf.tag); 92 s->ctx.uid = -1; 93 94 s->ops = fse->ops; 95 s->config_size = sizeof(struct virtio_9p_config) + len; 96 s->fid_list = NULL; 97 qemu_co_rwlock_init(&s->rename_lock); 98 99 if (s->ops->init(&s->ctx) < 0) { 100 fprintf(stderr, "Virtio-9p Failed to initialize fs-driver with id:%s" 101 " and export path:%s\n", s->fsconf.fsdev_id, s->ctx.fs_root); 102 goto out; 103 } 104 if (v9fs_init_worker_threads() < 0) { 105 fprintf(stderr, "worker thread initialization failed\n"); 106 goto out; 107 } 108 109 /* 110 * Check details of export path, We need to use fs driver 111 * call back to do that. Since we are in the init path, we don't 112 * use co-routines here. 113 */ 114 v9fs_path_init(&path); 115 if (s->ops->name_to_path(&s->ctx, NULL, "/", &path) < 0) { 116 fprintf(stderr, 117 "error in converting name to path %s", strerror(errno)); 118 goto out; 119 } 120 if (s->ops->lstat(&s->ctx, &path, &stat)) { 121 fprintf(stderr, "share path %s does not exist\n", fse->path); 122 goto out; 123 } else if (!S_ISDIR(stat.st_mode)) { 124 fprintf(stderr, "share path %s is not a directory\n", fse->path); 125 goto out; 126 } 127 v9fs_path_free(&path); 128 129 return 0; 130 out: 131 g_free(s->ctx.fs_root); 132 g_free(s->tag); 133 virtio_cleanup(vdev); 134 v9fs_path_free(&path); 135 136 return -1; 137 138 } 139 140 /* virtio-9p device */ 141 142 static Property virtio_9p_properties[] = { 143 DEFINE_VIRTIO_9P_PROPERTIES(V9fsState, fsconf), 144 DEFINE_PROP_END_OF_LIST(), 145 }; 146 147 static void virtio_9p_class_init(ObjectClass *klass, void *data) 148 { 149 DeviceClass *dc = DEVICE_CLASS(klass); 150 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 151 dc->props = virtio_9p_properties; 152 vdc->init = virtio_9p_device_init; 153 vdc->get_features = virtio_9p_get_features; 154 vdc->get_config = virtio_9p_get_config; 155 } 156 157 static const TypeInfo virtio_device_info = { 158 .name = TYPE_VIRTIO_9P, 159 .parent = TYPE_VIRTIO_DEVICE, 160 .instance_size = sizeof(V9fsState), 161 .class_init = virtio_9p_class_init, 162 }; 163 164 static void virtio_9p_register_types(void) 165 { 166 type_register_static(&virtio_device_info); 167 } 168 169 type_init(virtio_9p_register_types) 170