hw/9pfs/virtio-9p-device.c

   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.h"
  15 #include "hw/pc.h"
  16 #include "qemu_socket.h"
  17 #include "hw/virtio-pci.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 VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf *conf)
  50 {
  51     V9fsState *s;
  52     int i, len;
  53     struct stat stat;
  54     FsDriverEntry *fse;
  55     V9fsPath path;
  56
  57     s = (V9fsState *)virtio_common_init("virtio-9p",
  58                                     VIRTIO_ID_9P,
  59                                     sizeof(struct virtio_9p_config)+
  60                                     MAX_TAG_LEN,
  61                                     sizeof(V9fsState));
  62     /* initialize pdu allocator */
  63     QLIST_INIT(&s->free_list);
  64     QLIST_INIT(&s->active_list);
  65     for (i = 0; i < (MAX_REQ - 1); i++) {
  66         QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next);
  67     }
  68
  69     s->vq = virtio_add_queue(&s->vdev, MAX_REQ, handle_9p_output);
  70
  71     fse = get_fsdev_fsentry(conf->fsdev_id);
  72
  73     if (!fse) {
  74         /* We don't have a fsdev identified by fsdev_id */
  75         fprintf(stderr, "Virtio-9p device couldn't find fsdev with the "
  76                 "id = %s\n", conf->fsdev_id ? conf->fsdev_id : "NULL");
  77         exit(1);
  78     }
  79
  80     if (!conf->tag) {
  81         /* we haven't specified a mount_tag */
  82         fprintf(stderr, "fsdev with id %s needs mount_tag arguments\n",
  83                 conf->fsdev_id);
  84         exit(1);
  85     }
  86
  87     s->ctx.export_flags = fse->export_flags;
  88     if (fse->path) {
  89         s->ctx.fs_root = g_strdup(fse->path);
  90     } else {
  91         s->ctx.fs_root = NULL;
  92     }
  93     s->ctx.exops.get_st_gen = NULL;
  94     len = strlen(conf->tag);
  95     if (len > MAX_TAG_LEN - 1) {
  96         fprintf(stderr, "mount tag '%s' (%d bytes) is longer than "
  97                 "maximum (%d bytes)", conf->tag, len, MAX_TAG_LEN - 1);
  98         exit(1);
  99     }
 100
 101     s->tag = strdup(conf->tag);
 102     s->ctx.uid = -1;
 103
 104     s->ops = fse->ops;
 105     s->vdev.get_features = virtio_9p_get_features;
 106     s->config_size = sizeof(struct virtio_9p_config) + len;
 107     s->vdev.get_config = virtio_9p_get_config;
 108     s->fid_list = NULL;
 109     qemu_co_rwlock_init(&s->rename_lock);
 110
 111     if (s->ops->init(&s->ctx) < 0) {
 112         fprintf(stderr, "Virtio-9p Failed to initialize fs-driver with id:%s"
 113                 " and export path:%s\n", conf->fsdev_id, s->ctx.fs_root);
 114         exit(1);
 115     }
 116     if (v9fs_init_worker_threads() < 0) {
 117         fprintf(stderr, "worker thread initialization failed\n");
 118         exit(1);
 119     }
 120
 121     /*
 122      * Check details of export path, We need to use fs driver
 123      * call back to do that. Since we are in the init path, we don't
 124      * use co-routines here.
 125      */
 126     v9fs_path_init(&path);
 127     if (s->ops->name_to_path(&s->ctx, NULL, "/", &path) < 0) {
 128         fprintf(stderr,
 129                 "error in converting name to path %s", strerror(errno));
 130         exit(1);
 131     }
 132     if (s->ops->lstat(&s->ctx, &path, &stat)) {
 133         fprintf(stderr, "share path %s does not exist\n", fse->path);
 134         exit(1);
 135     } else if (!S_ISDIR(stat.st_mode)) {
 136         fprintf(stderr, "share path %s is not a directory\n", fse->path);
 137         exit(1);
 138     }
 139     v9fs_path_free(&path);
 140
 141     return &s->vdev;
 142 }
 143
 144 static int virtio_9p_init_pci(PCIDevice *pci_dev)
 145 {
 146     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 147     VirtIODevice *vdev;
 148
 149     vdev = virtio_9p_init(&pci_dev->qdev, &proxy->fsconf);
 150     vdev->nvectors = proxy->nvectors;
 151     virtio_init_pci(proxy, vdev);
 152     /* make the actual value visible */
 153     proxy->nvectors = vdev->nvectors;
 154     return 0;
 155 }
 156
 157 static Property virtio_9p_properties[] = {
 158     DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags, VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
 159     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2),
 160     DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
 161     DEFINE_PROP_STRING("mount_tag", VirtIOPCIProxy, fsconf.tag),
 162     DEFINE_PROP_STRING("fsdev", VirtIOPCIProxy, fsconf.fsdev_id),
 163     DEFINE_PROP_END_OF_LIST(),
 164 };
 165
 166 static void virtio_9p_class_init(ObjectClass *klass, void *data)
 167 {
 168     DeviceClass *dc = DEVICE_CLASS(klass);
 169     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 170
 171     k->init = virtio_9p_init_pci;
 172     k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
 173     k->device_id = 0x1009;
 174     k->revision = VIRTIO_PCI_ABI_VERSION;
 175     k->class_id = 0x2;
 176     dc->props = virtio_9p_properties;
 177     dc->reset = virtio_pci_reset;
 178 }
 179
 180 static TypeInfo virtio_9p_info = {
 181     .name          = "virtio-9p-pci",
 182     .parent        = TYPE_PCI_DEVICE,
 183     .instance_size = sizeof(VirtIOPCIProxy),
 184     .class_init    = virtio_9p_class_init,
 185 };
 186
 187 static void virtio_9p_register_types(void)
 188 {
 189     type_register_static(&virtio_9p_info);
 190     virtio_9p_set_fd_limit();
 191 }
 192
 193 type_init(virtio_9p_register_types)