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 void virtio_9p_device_realize(DeviceState *dev, Error **errp) 45 { 46 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 47 V9fsState *s = VIRTIO_9P(dev); 48 int i, len; 49 struct stat stat; 50 FsDriverEntry *fse; 51 V9fsPath path; 52 53 virtio_init(vdev, "virtio-9p", VIRTIO_ID_9P, 54 sizeof(struct virtio_9p_config) + MAX_TAG_LEN); 55 56 /* initialize pdu allocator */ 57 QLIST_INIT(&s->free_list); 58 QLIST_INIT(&s->active_list); 59 for (i = 0; i < (MAX_REQ - 1); i++) { 60 QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next); 61 } 62 63 s->vq = virtio_add_queue(vdev, MAX_REQ, handle_9p_output); 64 65 v9fs_path_init(&path); 66 67 fse = get_fsdev_fsentry(s->fsconf.fsdev_id); 68 69 if (!fse) { 70 /* We don't have a fsdev identified by fsdev_id */ 71 error_setg(errp, "Virtio-9p device couldn't find fsdev with the " 72 "id = %s", 73 s->fsconf.fsdev_id ? s->fsconf.fsdev_id : "NULL"); 74 goto out; 75 } 76 77 if (!s->fsconf.tag) { 78 /* we haven't specified a mount_tag */ 79 error_setg(errp, "fsdev with id %s needs mount_tag arguments", 80 s->fsconf.fsdev_id); 81 goto out; 82 } 83 84 s->ctx.export_flags = fse->export_flags; 85 s->ctx.fs_root = g_strdup(fse->path); 86 s->ctx.exops.get_st_gen = NULL; 87 len = strlen(s->fsconf.tag); 88 if (len > MAX_TAG_LEN - 1) { 89 error_setg(errp, "mount tag '%s' (%d bytes) is longer than " 90 "maximum (%d bytes)", s->fsconf.tag, len, MAX_TAG_LEN - 1); 91 goto out; 92 } 93 94 s->tag = g_strdup(s->fsconf.tag); 95 s->ctx.uid = -1; 96 97 s->ops = fse->ops; 98 s->config_size = sizeof(struct virtio_9p_config) + len; 99 s->fid_list = NULL; 100 qemu_co_rwlock_init(&s->rename_lock); 101 102 if (s->ops->init(&s->ctx) < 0) { 103 error_setg(errp, "Virtio-9p Failed to initialize fs-driver with id:%s" 104 " and export path:%s", s->fsconf.fsdev_id, s->ctx.fs_root); 105 goto out; 106 } 107 if (v9fs_init_worker_threads() < 0) { 108 error_setg(errp, "worker thread initialization failed"); 109 goto out; 110 } 111 112 /* 113 * Check details of export path, We need to use fs driver 114 * call back to do that. Since we are in the init path, we don't 115 * use co-routines here. 116 */ 117 if (s->ops->name_to_path(&s->ctx, NULL, "/", &path) < 0) { 118 error_setg(errp, 119 "error in converting name to path %s", strerror(errno)); 120 goto out; 121 } 122 if (s->ops->lstat(&s->ctx, &path, &stat)) { 123 error_setg(errp, "share path %s does not exist", fse->path); 124 goto out; 125 } else if (!S_ISDIR(stat.st_mode)) { 126 error_setg(errp, "share path %s is not a directory", fse->path); 127 goto out; 128 } 129 v9fs_path_free(&path); 130 131 return; 132 out: 133 g_free(s->ctx.fs_root); 134 g_free(s->tag); 135 virtio_cleanup(vdev); 136 v9fs_path_free(&path); 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); 150 151 dc->props = virtio_9p_properties; 152 set_bit(DEVICE_CATEGORY_STORAGE, dc->categories); 153 vdc->realize = virtio_9p_device_realize; 154 vdc->get_features = virtio_9p_get_features; 155 vdc->get_config = virtio_9p_get_config; 156 } 157 158 static const TypeInfo virtio_device_info = { 159 .name = TYPE_VIRTIO_9P, 160 .parent = TYPE_VIRTIO_DEVICE, 161 .instance_size = sizeof(V9fsState), 162 .class_init = virtio_9p_class_init, 163 }; 164 165 static void virtio_9p_register_types(void) 166 { 167 type_register_static(&virtio_device_info); 168 } 169 170 type_init(virtio_9p_register_types) 171