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 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 s->ctx.fs_root = g_strdup(fse->path); 89 s->ctx.exops.get_st_gen = NULL; 90 len = strlen(conf->tag); 91 if (len > MAX_TAG_LEN - 1) { 92 fprintf(stderr, "mount tag '%s' (%d bytes) is longer than " 93 "maximum (%d bytes)", conf->tag, len, MAX_TAG_LEN - 1); 94 exit(1); 95 } 96 97 s->tag = g_strdup(conf->tag); 98 s->ctx.uid = -1; 99 100 s->ops = fse->ops; 101 s->vdev.get_features = virtio_9p_get_features; 102 s->config_size = sizeof(struct virtio_9p_config) + len; 103 s->vdev.get_config = virtio_9p_get_config; 104 s->fid_list = NULL; 105 qemu_co_rwlock_init(&s->rename_lock); 106 107 if (s->ops->init(&s->ctx) < 0) { 108 fprintf(stderr, "Virtio-9p Failed to initialize fs-driver with id:%s" 109 " and export path:%s\n", conf->fsdev_id, s->ctx.fs_root); 110 exit(1); 111 } 112 if (v9fs_init_worker_threads() < 0) { 113 fprintf(stderr, "worker thread initialization failed\n"); 114 exit(1); 115 } 116 117 /* 118 * Check details of export path, We need to use fs driver 119 * call back to do that. Since we are in the init path, we don't 120 * use co-routines here. 121 */ 122 v9fs_path_init(&path); 123 if (s->ops->name_to_path(&s->ctx, NULL, "/", &path) < 0) { 124 fprintf(stderr, 125 "error in converting name to path %s", strerror(errno)); 126 exit(1); 127 } 128 if (s->ops->lstat(&s->ctx, &path, &stat)) { 129 fprintf(stderr, "share path %s does not exist\n", fse->path); 130 exit(1); 131 } else if (!S_ISDIR(stat.st_mode)) { 132 fprintf(stderr, "share path %s is not a directory\n", fse->path); 133 exit(1); 134 } 135 v9fs_path_free(&path); 136 137 return &s->vdev; 138 } 139