Re: [PATCH v2 5/8] tests/9pfs: add local Tsymlink test

[Greg Kurz <groug@kaod.org>]

On Wed, 21 Oct 2020 14:33:34 +0200
Christian Schoenebeck <qemu_oss@crudebyte.com> wrote:

> This test case uses a Tsymlink 9p request to create a symbolic link using
> the 9pfs 'local' fs driver.
> 
> Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
> ---

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

>  tests/qtest/virtio-9p-test.c | 77 ++++++++++++++++++++++++++++++++++++
>  1 file changed, 77 insertions(+)
> 
> diff --git a/tests/qtest/virtio-9p-test.c b/tests/qtest/virtio-9p-test.c
> index 6b74a1fd7e..0c11417236 100644
> --- a/tests/qtest/virtio-9p-test.c
> +++ b/tests/qtest/virtio-9p-test.c
> @@ -259,6 +259,7 @@ static const char *rmessage_name(uint8_t id)
>          id == P9_RWRITE ? "RWRITE" :
>          id == P9_RMKDIR ? "RMKDIR" :
>          id == P9_RLCREATE ? "RLCREATE" :
> +        id == P9_RSYMLINK ? "RSYMLINK" :
>          id == P9_RUNLINKAT ? "RUNLINKAT" :
>          id == P9_RFLUSH ? "RFLUSH" :
>          id == P9_RREADDIR ? "READDIR" :
> @@ -733,6 +734,39 @@ static void v9fs_rlcreate(P9Req *req, v9fs_qid *qid, uint32_t *iounit)
>      v9fs_req_free(req);
>  }
>  
> +/* size[4] Tsymlink tag[2] fid[4] name[s] symtgt[s] gid[4] */
> +static P9Req *v9fs_tsymlink(QVirtio9P *v9p, uint32_t fid, const char *name,
> +                            const char *symtgt, uint32_t gid, uint16_t tag)
> +{
> +    P9Req *req;
> +
> +    uint32_t body_size = 4 + 4;
> +    uint16_t string_size = v9fs_string_size(name) + v9fs_string_size(symtgt);
> +
> +    g_assert_cmpint(body_size, <=, UINT32_MAX - string_size);
> +    body_size += string_size;
> +
> +    req = v9fs_req_init(v9p, body_size, P9_TSYMLINK, tag);
> +    v9fs_uint32_write(req, fid);
> +    v9fs_string_write(req, name);
> +    v9fs_string_write(req, symtgt);
> +    v9fs_uint32_write(req, gid);
> +    v9fs_req_send(req);
> +    return req;
> +}
> +
> +/* size[4] Rsymlink tag[2] qid[13] */
> +static void v9fs_rsymlink(P9Req *req, v9fs_qid *qid)
> +{
> +    v9fs_req_recv(req, P9_RSYMLINK);
> +    if (qid) {
> +        v9fs_memread(req, qid, 13);
> +    } else {
> +        v9fs_memskip(req, 13);
> +    }
> +    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)
> @@ -1089,6 +1123,25 @@ static uint32_t do_lcreate(QVirtio9P *v9p, const char *path,
>      return fid;
>  }
>  
> +/* create symlink named @a clink in directory @a path pointing to @a to */
> +static void do_symlink(QVirtio9P *v9p, const char *path, const char *clink,
> +                       const char *to)
> +{
> +    char *const name = g_strdup(clink);
> +    char *const dst = g_strdup(to);
> +    uint32_t fid;
> +    P9Req *req;
> +
> +    fid = do_walk(v9p, path);
> +
> +    req = v9fs_tsymlink(v9p, fid, name, dst, 0, 0);
> +    v9fs_req_wait_for_reply(req, NULL);
> +    v9fs_rsymlink(req, NULL);
> +
> +    g_free(dst);
> +    g_free(name);
> +}
> +
>  static void do_unlinkat(QVirtio9P *v9p, const char *atpath, const char *rpath,
>                          uint32_t flags)
>  {
> @@ -1219,6 +1272,29 @@ static void fs_unlinkat_file(void *obj, void *data, QGuestAllocator *t_alloc)
>      g_free(new_file);
>  }
>  
> +static void fs_symlink_file(void *obj, void *data, QGuestAllocator *t_alloc)
> +{
> +    QVirtio9P *v9p = obj;
> +    alloc = t_alloc;
> +    struct stat st;
> +    char *real_file = virtio_9p_test_path("05/real_file");
> +    char *symlink_file = virtio_9p_test_path("05/symlink_file");
> +
> +    do_attach(v9p);
> +    do_mkdir(v9p, "/", "05");
> +    do_lcreate(v9p, "05", "real_file");
> +    g_assert(stat(real_file, &st) == 0);
> +    g_assert((st.st_mode & S_IFMT) == S_IFREG);
> +
> +    do_symlink(v9p, "05", "symlink_file", "real_file");
> +
> +    /* check if created link exists now */
> +    g_assert(stat(symlink_file, &st) == 0);
> +
> +    g_free(symlink_file);
> +    g_free(real_file);
> +}
> +
>  static void *assign_9p_local_driver(GString *cmd_line, void *arg)
>  {
>      virtio_9p_assign_local_driver(cmd_line, "security_model=mapped-xattr");
> @@ -1262,6 +1338,7 @@ static void register_virtio_9p_test(void)
>      qos_add_test("local/unlinkat_dir", "virtio-9p", fs_unlinkat_dir, &opts);
>      qos_add_test("local/create_file", "virtio-9p", fs_create_file, &opts);
>      qos_add_test("local/unlinkat_file", "virtio-9p", fs_unlinkat_file, &opts);
> +    qos_add_test("local/symlink_file", "virtio-9p", fs_symlink_file, &opts);
>  }
>  
>  libqos_init(register_virtio_9p_test);