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 #include "hw/virtio/virtio-access.h" 23 24 static uint64_t virtio_9p_get_features(VirtIODevice *vdev, uint64_t features) 25 { 26 virtio_add_feature(&features, VIRTIO_9P_MOUNT_TAG); 27 return features; 28 } 29 30 static void virtio_9p_get_config(VirtIODevice *vdev, uint8_t *config) 31 { 32 int len; 33 struct virtio_9p_config *cfg; 34 V9fsState *s = VIRTIO_9P(vdev); 35 36 len = strlen(s->tag); 37 cfg = g_malloc0(sizeof(struct virtio_9p_config) + len); 38 virtio_stw_p(vdev, &cfg->tag_len, len); 39 /* We don't copy the terminating null to config space */ 40 memcpy(cfg->tag, s->tag, len); 41 memcpy(config, cfg, s->config_size); 42 g_free(cfg); 43 } 44 45 static void virtio_9p_device_realize(DeviceState *dev, Error **errp) 46 { 47 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 48 V9fsState *s = VIRTIO_9P(dev); 49 int i, len; 50 struct stat stat; 51 FsDriverEntry *fse; 52 V9fsPath path; 53 54 virtio_init(vdev, "virtio-9p", VIRTIO_ID_9P, 55 sizeof(struct virtio_9p_config) + MAX_TAG_LEN); 56 57 /* initialize pdu allocator */ 58 QLIST_INIT(&s->free_list); 59 QLIST_INIT(&s->active_list); 60 for (i = 0; i < (MAX_REQ - 1); i++) { 61 QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next); 62 } 63 64 s->vq = virtio_add_queue(vdev, MAX_REQ, handle_9p_output); 65 66 v9fs_path_init(&path); 67 68 fse = get_fsdev_fsentry(s->fsconf.fsdev_id); 69 70 if (!fse) { 71 /* We don't have a fsdev identified by fsdev_id */ 72 error_setg(errp, "Virtio-9p device couldn't find fsdev with the " 73 "id = %s", 74 s->fsconf.fsdev_id ? s->fsconf.fsdev_id : "NULL"); 75 goto out; 76 } 77 78 if (!s->fsconf.tag) { 79 /* we haven't specified a mount_tag */ 80 error_setg(errp, "fsdev with id %s needs mount_tag arguments", 81 s->fsconf.fsdev_id); 82 goto out; 83 } 84 85 s->ctx.export_flags = fse->export_flags; 86 s->ctx.fs_root = g_strdup(fse->path); 87 s->ctx.exops.get_st_gen = NULL; 88 len = strlen(s->fsconf.tag); 89 if (len > MAX_TAG_LEN - 1) { 90 error_setg(errp, "mount tag '%s' (%d bytes) is longer than " 91 "maximum (%d bytes)", s->fsconf.tag, len, MAX_TAG_LEN - 1); 92 goto out; 93 } 94 95 s->tag = g_strdup(s->fsconf.tag); 96 s->ctx.uid = -1; 97 98 s->ops = fse->ops; 99 s->config_size = sizeof(struct virtio_9p_config) + len; 100 s->fid_list = NULL; 101 qemu_co_rwlock_init(&s->rename_lock); 102 103 if (s->ops->init(&s->ctx) < 0) { 104 error_setg(errp, "Virtio-9p Failed to initialize fs-driver with id:%s" 105 " and export path:%s", s->fsconf.fsdev_id, s->ctx.fs_root); 106 goto out; 107 } 108 if (v9fs_init_worker_threads() < 0) { 109 error_setg(errp, "worker thread initialization failed"); 110 goto out; 111 } 112 113 /* 114 * Check details of export path, We need to use fs driver 115 * call back to do that. Since we are in the init path, we don't 116 * use co-routines here. 117 */ 118 if (s->ops->name_to_path(&s->ctx, NULL, "/", &path) < 0) { 119 error_setg(errp, 120 "error in converting name to path %s", strerror(errno)); 121 goto out; 122 } 123 if (s->ops->lstat(&s->ctx, &path, &stat)) { 124 error_setg(errp, "share path %s does not exist", fse->path); 125 goto out; 126 } else if (!S_ISDIR(stat.st_mode)) { 127 error_setg(errp, "share path %s is not a directory", fse->path); 128 goto out; 129 } 130 v9fs_path_free(&path); 131 132 return; 133 out: 134 g_free(s->ctx.fs_root); 135 g_free(s->tag); 136 virtio_cleanup(vdev); 137 v9fs_path_free(&path); 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); 151 152 dc->props = virtio_9p_properties; 153 set_bit(DEVICE_CATEGORY_STORAGE, dc->categories); 154 vdc->realize = virtio_9p_device_realize; 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