Re: [PATCH v2 2/8] tests/9pfs: add local Tunlinkat directory test

[Greg Kurz <groug@kaod.org>]

On Wed, 21 Oct 2020 14:17:01 +0200
Christian Schoenebeck <qemu_oss@crudebyte.com> wrote:

> This test case uses a Tunlinkat 9p request with flag AT_REMOVEDIR
> (see 'man 2 unlink') to remove a directory from host's test directory.
> 
> Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
> ---

Reviewed-by: Greg Kurz <groug@kaod.org>

>  tests/qtest/virtio-9p-test.c | 71 ++++++++++++++++++++++++++++++++++++
>  1 file changed, 71 insertions(+)
> 
> diff --git a/tests/qtest/virtio-9p-test.c b/tests/qtest/virtio-9p-test.c
> index 21807037df..abd7e44648 100644
> --- a/tests/qtest/virtio-9p-test.c
> +++ b/tests/qtest/virtio-9p-test.c
> @@ -258,6 +258,7 @@ static const char *rmessage_name(uint8_t id)
>          id == P9_RLOPEN ? "RLOPEN" :
>          id == P9_RWRITE ? "RWRITE" :
>          id == P9_RMKDIR ? "RMKDIR" :
> +        id == P9_RUNLINKAT ? "RUNLINKAT" :
>          id == P9_RFLUSH ? "RFLUSH" :
>          id == P9_RREADDIR ? "READDIR" :
>          "<unknown>";
> @@ -693,6 +694,33 @@ static void v9fs_rmkdir(P9Req *req, v9fs_qid *qid)
>      v9fs_req_free(req);
>  }
>  
> +/* size[4] Tunlinkat tag[2] dirfd[4] name[s] flags[4] */
> +static P9Req *v9fs_tunlinkat(QVirtio9P *v9p, uint32_t dirfd, const char *name,
> +                             uint32_t flags, uint16_t tag)
> +{
> +    P9Req *req;
> +
> +    uint32_t body_size = 4 + 4;
> +    uint16_t string_size = v9fs_string_size(name);
> +
> +    g_assert_cmpint(body_size, <=, UINT32_MAX - string_size);
> +    body_size += string_size;
> +
> +    req = v9fs_req_init(v9p, body_size, P9_TUNLINKAT, tag);
> +    v9fs_uint32_write(req, dirfd);
> +    v9fs_string_write(req, name);
> +    v9fs_uint32_write(req, flags);
> +    v9fs_req_send(req);
> +    return req;
> +}
> +
> +/* size[4] Runlinkat tag[2] */
> +static void v9fs_runlinkat(P9Req *req)
> +{
> +    v9fs_req_recv(req, P9_RUNLINKAT);
> +    v9fs_req_free(req);
> +}
> +
>  /* basic readdir test where reply fits into a single response message */
>  static void fs_readdir(void *obj, void *data, QGuestAllocator *t_alloc)
>  {
> @@ -1004,6 +1032,22 @@ static void do_mkdir(QVirtio9P *v9p, const char *path, const char *cname)
>      g_free(name);
>  }
>  
> +static void do_unlinkat(QVirtio9P *v9p, const char *atpath, const char *rpath,
> +                        uint32_t flags)
> +{
> +    char *const name = g_strdup(rpath);
> +    uint32_t fid;
> +    P9Req *req;
> +
> +    fid = do_walk(v9p, atpath);
> +
> +    req = v9fs_tunlinkat(v9p, fid, name, flags, 0);
> +    v9fs_req_wait_for_reply(req, NULL);
> +    v9fs_runlinkat(req);
> +
> +    g_free(name);
> +}
> +
>  static void fs_readdir_split_128(void *obj, void *data,
>                                   QGuestAllocator *t_alloc)
>  {
> @@ -1050,6 +1094,32 @@ static void fs_create_dir(void *obj, void *data, QGuestAllocator *t_alloc)
>      g_free(root_path);
>  }
>  
> +static void fs_unlinkat_dir(void *obj, void *data, QGuestAllocator *t_alloc)
> +{
> +    QVirtio9P *v9p = obj;
> +    alloc = t_alloc;
> +    struct stat st;
> +    char *root_path = virtio_9p_test_path("");
> +    char *new_dir = virtio_9p_test_path("02");
> +
> +    g_assert(root_path != NULL);
> +
> +    do_attach(v9p);
> +    do_mkdir(v9p, "/", "02");
> +
> +    /* check if created directory really exists now ... */
> +    g_assert(stat(new_dir, &st) == 0);
> +    /* ... and is actually a directory */
> +    g_assert((st.st_mode & S_IFMT) == S_IFDIR);
> +
> +    do_unlinkat(v9p, "/", "02", AT_REMOVEDIR);
> +    /* directory should be gone now */
> +    g_assert(stat(new_dir, &st) != 0);
> +
> +    g_free(new_dir);
> +    g_free(root_path);
> +}
> +
>  static void *assign_9p_local_driver(GString *cmd_line, void *arg)
>  {
>      virtio_9p_assign_local_driver(cmd_line, "security_model=mapped-xattr");
> @@ -1090,6 +1160,7 @@ static void register_virtio_9p_test(void)
>      opts.before = assign_9p_local_driver;
>      qos_add_test("local/config", "virtio-9p", pci_config,  &opts);
>      qos_add_test("local/create_dir", "virtio-9p", fs_create_dir, &opts);
> +    qos_add_test("local/unlinkat_dir", "virtio-9p", fs_unlinkat_dir, &opts);
>  }
>  
>  libqos_init(register_virtio_9p_test);