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teigland pushed a commit to branch rhel83 in repository sanlock.
commit 54435856a134468c97112bfe44815ca48e1b424f Author: Benny Zlotnik bzlotnik@redhat.com AuthorDate: Mon Oct 5 13:18:05 2020 +0300
python: expose get_lvb
Add a binding to the get_lvb function to allow reading data from LVB.
Signed-off-by: Benny Zlotnik bzlotnik@redhat.com --- python/sanlock.c | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 59 insertions(+)
diff --git a/python/sanlock.c b/python/sanlock.c index 498cb88..40d3b88 100644 --- a/python/sanlock.c +++ b/python/sanlock.c @@ -1750,6 +1750,63 @@ finally: Py_RETURN_NONE; }
+PyDoc_STRVAR(pydoc_get_lvb, "\ +get_lvb(lockspace, resource, disks) -> bytes\n\ +Read Lock Value Block for a given resource\n\ +\n\ +Arguments\n\ + lockspace lockspace name (str)\n\ + resource resource name (int)\n\ + disks path and offset (tuple)\n\ +\n\ +Returns\n\ + data data written with set_lvb\n\ +Notes\n\ +\n\ +The resource must be acquired with the SANLK_ACQUIRE_LVB flag\n"); +static PyObject * +py_get_lvb(PyObject *self __unused, PyObject *args, PyObject *keywds) +{ + uint32_t flags = 0; + int rv = -1; + struct sanlk_resource *res = NULL; + PyObject *lockspace = NULL, *resource = NULL; + PyObject *disks; + char data[512]; + + static char *kwlist[] = {"lockspace", "resource", "disks", NULL}; + if (!PyArg_ParseTupleAndKeywords(args, keywds, "O&O&O!", kwlist, + convert_to_pybytes, &lockspace, convert_to_pybytes, &resource, + &PyList_Type, &disks)) { + goto finally; + } + + if (parse_disks(disks, &res) < 0) { + goto finally; + } + + strncpy(res->lockspace_name, PyBytes_AsString(lockspace), SANLK_NAME_LEN); + strncpy(res->name, PyBytes_AsString(resource), SANLK_NAME_LEN); + + Py_BEGIN_ALLOW_THREADS + rv = sanlock_get_lvb(flags, res, data, sizeof(data)); + Py_END_ALLOW_THREADS + + if (rv < 0) { + set_sanlock_error(rv, "Unable to get lvb"); + goto finally; + } + +finally: + Py_XDECREF(lockspace); + Py_XDECREF(resource); + free(res); + if (rv < 0) + return NULL; + + return Py_BuildValue("y", data); +} + static PyMethodDef sanlock_methods[] = { {"register", py_register, METH_NOARGS, pydoc_register}, @@ -1793,6 +1850,8 @@ sanlock_methods[] = { METH_VARARGS|METH_KEYWORDS, pydoc_set_event}, {"set_lvb", (PyCFunction) py_set_lvb, METH_VARARGS|METH_KEYWORDS, pydoc_set_lvb}, + {"get_lvb", (PyCFunction) py_get_lvb, + METH_VARARGS|METH_KEYWORDS, pydoc_get_lvb},
{NULL, NULL, 0, NULL} };