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 v9fs_path_init(&path); 65 66 fse = get_fsdev_fsentry(s->fsconf.fsdev_id); 67 68 if (!fse) { 69 /* We don't have a fsdev identified by fsdev_id */ 70 fprintf(stderr, "Virtio-9p device couldn't find fsdev with the " 71 "id = %s\n", 72 s->fsconf.fsdev_id ? s->fsconf.fsdev_id : "NULL"); 73 goto out; 74 } 75 76 if (!s->fsconf.tag) { 77 /* we haven't specified a mount_tag */ 78 fprintf(stderr, "fsdev with id %s needs mount_tag arguments\n", 79 s->fsconf.fsdev_id); 80 goto out; 81 } 82 83 s->ctx.export_flags = fse->export_flags; 84 s->ctx.fs_root = g_strdup(fse->path); 85 s->ctx.exops.get_st_gen = NULL; 86 len = strlen(s->fsconf.tag); 87 if (len > MAX_TAG_LEN - 1) { 88 fprintf(stderr, "mount tag '%s' (%d bytes) is longer than " 89 "maximum (%d bytes)", s->fsconf.tag, len, MAX_TAG_LEN - 1); 90 goto out; 91 } 92 93 s->tag = g_strdup(s->fsconf.tag); 94 s->ctx.uid = -1; 95 96 s->ops = fse->ops; 97 s->config_size = sizeof(struct virtio_9p_config) + len; 98 s->fid_list = NULL; 99 qemu_co_rwlock_init(&s->rename_lock); 100 101 if (s->ops->init(&s->ctx) < 0) { 102 fprintf(stderr, "Virtio-9p Failed to initialize fs-driver with id:%s" 103 " and export path:%s\n", s->fsconf.fsdev_id, s->ctx.fs_root); 104 goto out; 105 } 106 if (v9fs_init_worker_threads() < 0) { 107 fprintf(stderr, "worker thread initialization failed\n"); 108 goto out; 109 } 110 111 /* 112 * Check details of export path, We need to use fs driver 113 * call back to do that. Since we are in the init path, we don't 114 * use co-routines here. 115 */ 116 if (s->ops->name_to_path(&s->ctx, NULL, "/", &path) < 0) { 117 fprintf(stderr, 118 "error in converting name to path %s", strerror(errno)); 119 goto out; 120 } 121 if (s->ops->lstat(&s->ctx, &path, &stat)) { 122 fprintf(stderr, "share path %s does not exist\n", fse->path); 123 goto out; 124 } else if (!S_ISDIR(stat.st_mode)) { 125 fprintf(stderr, "share path %s is not a directory\n", fse->path); 126 goto out; 127 } 128 v9fs_path_free(&path); 129 130 return 0; 131 out: 132 g_free(s->ctx.fs_root); 133 g_free(s->tag); 134 virtio_cleanup(vdev); 135 v9fs_path_free(&path); 136 137 return -1; 138 139 } 140 141 /* virtio-9p device */ 142 143 static Property virtio_9p_properties[] = { 144 DEFINE_VIRTIO_9P_PROPERTIES(V9fsState, fsconf), 145 DEFINE_PROP_END_OF_LIST(), 146 }; 147 148 static void virtio_9p_class_init(ObjectClass *klass, void *data) 149 { 150 DeviceClass *dc = DEVICE_CLASS(klass); 151 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 152 dc->props = virtio_9p_properties; 153 set_bit(DEVICE_CATEGORY_STORAGE, dc->categories); 154 vdc->init = virtio_9p_device_init; 155 vdc->get_features = virtio_9p_get_features; 156 vdc->get_config = virtio_9p_get_config; 157 } 158 159 static const TypeInfo virtio_device_info = { 160 .name = TYPE_VIRTIO_9P, 161 .parent = TYPE_VIRTIO_DEVICE, 162 .instance_size = sizeof(V9fsState), 163 .class_init = virtio_9p_class_init, 164 }; 165 166 static void virtio_9p_register_types(void) 167 { 168 type_register_static(&virtio_device_info); 169 } 170 171 type_init(virtio_9p_register_types) 172