251 lines
6.9 KiB
C
251 lines
6.9 KiB
C
/*
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* Copyright (C) 2018 Facebook
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*
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* This file is part of libbtrfsutil.
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*
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* libbtrfsutil is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* libbtrfsutil is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with libbtrfsutil. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "btrfsutilpy.h"
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static int fd_converter(PyObject *o, void *p)
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{
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int *fd = p;
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long tmp;
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int overflow;
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tmp = PyLong_AsLongAndOverflow(o, &overflow);
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if (tmp == -1 && PyErr_Occurred())
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return 0;
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if (overflow > 0 || tmp > INT_MAX) {
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PyErr_SetString(PyExc_OverflowError,
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"fd is greater than maximum");
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return 0;
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}
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if (overflow < 0 || tmp < 0) {
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PyErr_SetString(PyExc_ValueError, "fd is negative");
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return 0;
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}
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*fd = tmp;
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return 1;
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}
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int path_converter(PyObject *o, void *p)
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{
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struct path_arg *path = p;
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int is_index, is_bytes, is_unicode;
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PyObject *bytes = NULL;
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Py_ssize_t length = 0;
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char *tmp;
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if (o == NULL) {
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path_cleanup(p);
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return 1;
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}
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path->object = path->cleanup = NULL;
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Py_INCREF(o);
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path->fd = -1;
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is_index = path->allow_fd && PyIndex_Check(o);
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is_bytes = PyBytes_Check(o);
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is_unicode = PyUnicode_Check(o);
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if (!is_index && !is_bytes && !is_unicode) {
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_Py_IDENTIFIER(__fspath__);
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PyObject *func;
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func = _PyObject_LookupSpecial(o, &PyId___fspath__);
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if (func == NULL)
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goto err_format;
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Py_DECREF(o);
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o = PyObject_CallFunctionObjArgs(func, NULL);
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Py_DECREF(func);
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if (o == NULL)
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return 0;
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is_bytes = PyBytes_Check(o);
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is_unicode = PyUnicode_Check(o);
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}
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if (is_unicode) {
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if (!PyUnicode_FSConverter(o, &bytes))
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goto err;
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} else if (is_bytes) {
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bytes = o;
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Py_INCREF(bytes);
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} else if (is_index) {
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if (!fd_converter(o, &path->fd))
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goto err;
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path->path = NULL;
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goto out;
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} else {
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err_format:
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PyErr_Format(PyExc_TypeError, "expected %s, not %s",
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path->allow_fd ? "string, bytes, os.PathLike, or integer" :
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"string, bytes, or os.PathLike",
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Py_TYPE(o)->tp_name);
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goto err;
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}
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length = PyBytes_GET_SIZE(bytes);
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tmp = PyBytes_AS_STRING(bytes);
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if ((size_t)length != strlen(tmp)) {
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PyErr_SetString(PyExc_TypeError,
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"path has embedded nul character");
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goto err;
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}
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path->path = tmp;
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if (bytes == o)
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Py_DECREF(bytes);
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else
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path->cleanup = bytes;
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path->fd = -1;
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out:
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path->length = length;
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path->object = o;
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return Py_CLEANUP_SUPPORTED;
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err:
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Py_XDECREF(o);
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Py_XDECREF(bytes);
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return 0;
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}
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void path_cleanup(struct path_arg *path)
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{
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Py_CLEAR(path->object);
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Py_CLEAR(path->cleanup);
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}
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static PyMethodDef btrfsutil_methods[] = {
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{"sync", (PyCFunction)filesystem_sync,
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METH_VARARGS | METH_KEYWORDS,
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"sync(path)\n\n"
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"Sync a specific Btrfs filesystem.\n\n"
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"Arguments:\n"
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"path -- string, bytes, path-like object, or open file descriptor"},
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{"start_sync", (PyCFunction)start_sync,
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METH_VARARGS | METH_KEYWORDS,
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"start_sync(path) -> int\n\n"
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"Start a sync on a specific Btrfs filesystem and return the\n"
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"transaction ID.\n\n"
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"Arguments:\n"
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"path -- string, bytes, path-like object, or open file descriptor"},
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{"wait_sync", (PyCFunction)wait_sync,
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METH_VARARGS | METH_KEYWORDS,
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"wait_sync(path, transid=0)\n\n"
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"Wait for a transaction to sync.\n"
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"Arguments:\n"
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"path -- string, bytes, path-like object, or open file descriptor\n"
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"transid -- int transaction ID to wait for, or zero for the current\n"
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"transaction"},
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{"is_subvolume", (PyCFunction)is_subvolume,
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METH_VARARGS | METH_KEYWORDS,
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"is_subvolume(path) -> bool\n\n"
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"Get whether a file is a subvolume.\n\n"
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"Arguments:\n"
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"path -- string, bytes, path-like object, or open file descriptor"},
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{"subvolume_id", (PyCFunction)subvolume_id,
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METH_VARARGS | METH_KEYWORDS,
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"subvolume_id(path) -> int\n\n"
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"Get the ID of the subvolume containing a file.\n\n"
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"Arguments:\n"
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"path -- string, bytes, path-like object, or open file descriptor"},
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{"subvolume_path", (PyCFunction)subvolume_path,
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METH_VARARGS | METH_KEYWORDS,
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"subvolume_path(path, id=0) -> int\n\n"
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"Get the path of a subvolume relative to the filesystem root.\n\n"
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"Arguments:\n"
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"path -- string, bytes, path-like object, or open file descriptor\n"
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"id -- if not zero, instead of returning the subvolume path of the\n"
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"given path, return the path of the subvolume with this ID"},
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{"subvolume_info", (PyCFunction)subvolume_info,
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METH_VARARGS | METH_KEYWORDS,
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"subvolume_info(path, id=0) -> SubvolumeInfo\n\n"
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"Get information about a subvolume.\n\n"
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"Arguments:\n"
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"path -- string, bytes, path-like object, or open file descriptor\n"
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"id -- if not zero, instead of returning information about the\n"
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"given path, return information about the subvolume with this ID"},
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{"get_subvolume_read_only", (PyCFunction)get_subvolume_read_only,
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METH_VARARGS | METH_KEYWORDS,
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"get_subvolume_read_only(path) -> bool\n\n"
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"Get whether a subvolume is read-only.\n\n"
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"Arguments:\n"
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"path -- string, bytes, path-like object, or open file descriptor"},
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{"set_subvolume_read_only", (PyCFunction)set_subvolume_read_only,
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METH_VARARGS | METH_KEYWORDS,
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"set_subvolume_read_only(path, read_only=True)\n\n"
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"Set whether a subvolume is read-only.\n\n"
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"Arguments:\n"
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"path -- string, bytes, path-like object, or open file descriptor\n"
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"read_only -- bool flag value"},
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{"create_subvolume", (PyCFunction)create_subvolume,
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METH_VARARGS | METH_KEYWORDS,
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"create_subvolume(path, async=False)\n\n"
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"Create a new subvolume.\n\n"
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"Arguments:\n"
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"path -- string, bytes, or path-like object\n"
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"async -- create the subvolume without waiting for it to commit to\n"
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"disk and return the transaction ID"},
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{},
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};
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static struct PyModuleDef btrfsutilmodule = {
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PyModuleDef_HEAD_INIT,
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"btrfsutil",
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"Library for managing Btrfs filesystems",
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-1,
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btrfsutil_methods,
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};
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PyMODINIT_FUNC
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PyInit_btrfsutil(void)
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{
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PyObject *m;
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BtrfsUtilError_type.tp_base = (PyTypeObject *)PyExc_OSError;
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if (PyType_Ready(&BtrfsUtilError_type) < 0)
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return NULL;
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if (PyStructSequence_InitType2(&SubvolumeInfo_type, &SubvolumeInfo_desc) < 0)
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return NULL;
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QgroupInherit_type.tp_new = PyType_GenericNew;
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if (PyType_Ready(&QgroupInherit_type) < 0)
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return NULL;
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m = PyModule_Create(&btrfsutilmodule);
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if (!m)
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return NULL;
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Py_INCREF(&BtrfsUtilError_type);
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PyModule_AddObject(m, "BtrfsUtilError",
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(PyObject *)&BtrfsUtilError_type);
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Py_INCREF(&SubvolumeInfo_type);
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PyModule_AddObject(m, "SubvolumeInfo", (PyObject *)&SubvolumeInfo_type);
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Py_INCREF(&QgroupInherit_type);
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PyModule_AddObject(m, "QgroupInherit",
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(PyObject *)&QgroupInherit_type);
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add_module_constants(m);
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return m;
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}
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