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/*
* Copyright (C) 2018 Facebook
*
* This file is part of libbtrfsutil.
*
* libbtrfsutil is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* libbtrfsutil is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with libbtrfsutil. If not, see <http://www.gnu.org/licenses/>.
*/
#include "btrfsutilpy.h"
static int fd_converter(PyObject *o, void *p)
{
int *fd = p;
long tmp;
int overflow;
tmp = PyLong_AsLongAndOverflow(o, &overflow);
if (tmp == -1 && PyErr_Occurred())
return 0;
if (overflow > 0 || tmp > INT_MAX) {
PyErr_SetString(PyExc_OverflowError,
"fd is greater than maximum");
return 0;
}
if (overflow < 0 || tmp < 0) {
PyErr_SetString(PyExc_ValueError, "fd is negative");
return 0;
}
*fd = tmp;
return 1;
}
int path_converter(PyObject *o, void *p)
{
struct path_arg *path = p;
int is_index, is_bytes, is_unicode;
PyObject *bytes = NULL;
Py_ssize_t length = 0;
char *tmp;
if (o == NULL) {
path_cleanup(p);
return 1;
}
path->object = path->cleanup = NULL;
Py_INCREF(o);
path->fd = -1;
is_index = path->allow_fd && PyIndex_Check(o);
is_bytes = PyBytes_Check(o);
is_unicode = PyUnicode_Check(o);
if (!is_index && !is_bytes && !is_unicode) {
_Py_IDENTIFIER(__fspath__);
PyObject *func;
func = _PyObject_LookupSpecial(o, &PyId___fspath__);
if (func == NULL)
goto err_format;
Py_DECREF(o);
o = PyObject_CallFunctionObjArgs(func, NULL);
Py_DECREF(func);
if (o == NULL)
return 0;
is_bytes = PyBytes_Check(o);
is_unicode = PyUnicode_Check(o);
}
if (is_unicode) {
if (!PyUnicode_FSConverter(o, &bytes))
goto err;
} else if (is_bytes) {
bytes = o;
Py_INCREF(bytes);
} else if (is_index) {
if (!fd_converter(o, &path->fd))
goto err;
path->path = NULL;
goto out;
} else {
err_format:
PyErr_Format(PyExc_TypeError, "expected %s, not %s",
path->allow_fd ? "string, bytes, os.PathLike, or integer" :
"string, bytes, or os.PathLike",
Py_TYPE(o)->tp_name);
goto err;
}
length = PyBytes_GET_SIZE(bytes);
tmp = PyBytes_AS_STRING(bytes);
if ((size_t)length != strlen(tmp)) {
PyErr_SetString(PyExc_TypeError,
"path has embedded nul character");
goto err;
}
path->path = tmp;
if (bytes == o)
Py_DECREF(bytes);
else
path->cleanup = bytes;
path->fd = -1;
out:
path->length = length;
path->object = o;
return Py_CLEANUP_SUPPORTED;
err:
Py_XDECREF(o);
Py_XDECREF(bytes);
return 0;
}
void path_cleanup(struct path_arg *path)
{
Py_CLEAR(path->object);
Py_CLEAR(path->cleanup);
}
static PyMethodDef btrfsutil_methods[] = {
{"sync", (PyCFunction)filesystem_sync,
METH_VARARGS | METH_KEYWORDS,
"sync(path)\n\n"
"Sync a specific Btrfs filesystem.\n\n"
"Arguments:\n"
"path -- string, bytes, path-like object, or open file descriptor"},
{"start_sync", (PyCFunction)start_sync,
METH_VARARGS | METH_KEYWORDS,
"start_sync(path) -> int\n\n"
"Start a sync on a specific Btrfs filesystem and return the\n"
"transaction ID.\n\n"
"Arguments:\n"
"path -- string, bytes, path-like object, or open file descriptor"},
{"wait_sync", (PyCFunction)wait_sync,
METH_VARARGS | METH_KEYWORDS,
"wait_sync(path, transid=0)\n\n"
"Wait for a transaction to sync.\n"
"Arguments:\n"
"path -- string, bytes, path-like object, or open file descriptor\n"
"transid -- int transaction ID to wait for, or zero for the current\n"
"transaction"},
{"is_subvolume", (PyCFunction)is_subvolume,
METH_VARARGS | METH_KEYWORDS,
"is_subvolume(path) -> bool\n\n"
"Get whether a file is a subvolume.\n\n"
"Arguments:\n"
"path -- string, bytes, path-like object, or open file descriptor"},
{"subvolume_id", (PyCFunction)subvolume_id,
METH_VARARGS | METH_KEYWORDS,
"subvolume_id(path) -> int\n\n"
"Get the ID of the subvolume containing a file.\n\n"
"Arguments:\n"
"path -- string, bytes, path-like object, or open file descriptor"},
{"create_subvolume", (PyCFunction)create_subvolume,
METH_VARARGS | METH_KEYWORDS,
"create_subvolume(path, async=False)\n\n"
"Create a new subvolume.\n\n"
"Arguments:\n"
"path -- string, bytes, or path-like object\n"
"async -- create the subvolume without waiting for it to commit to\n"
"disk and return the transaction ID"},
{},
};
static struct PyModuleDef btrfsutilmodule = {
PyModuleDef_HEAD_INIT,
"btrfsutil",
"Library for managing Btrfs filesystems",
-1,
btrfsutil_methods,
};
PyMODINIT_FUNC
PyInit_btrfsutil(void)
{
PyObject *m;
BtrfsUtilError_type.tp_base = (PyTypeObject *)PyExc_OSError;
if (PyType_Ready(&BtrfsUtilError_type) < 0)
return NULL;
QgroupInherit_type.tp_new = PyType_GenericNew;
if (PyType_Ready(&QgroupInherit_type) < 0)
return NULL;
m = PyModule_Create(&btrfsutilmodule);
if (!m)
return NULL;
Py_INCREF(&BtrfsUtilError_type);
PyModule_AddObject(m, "BtrfsUtilError",
(PyObject *)&BtrfsUtilError_type);
Py_INCREF(&QgroupInherit_type);
PyModule_AddObject(m, "QgroupInherit",
(PyObject *)&QgroupInherit_type);
add_module_constants(m);
return m;
}
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