[Libguestfs] [nbdkit PATCH 3/5] python: Update internals to plugin API level 2

[Eric Blake]

Adjust internal functions in preparation for FUA support; although
at this point, the default plugins.c can_fua implementation
correctly reports python as needing emulation, and we can assert
that we aren't seeing a FUA flag.

Signed-off-by: Eric Blake <eblake at redhat.com>
---
 plugins/python/python.c | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/plugins/python/python.c b/plugins/python/python.c
index aa09dce7..1954881c 100644
--- a/plugins/python/python.c
+++ b/plugins/python/python.c
@@ -46,6 +46,8 @@
 #define PY_SSIZE_T_CLEAN 1
 #include <Python.h>

+#define NBDKIT_API_VERSION 2
+
 #include <nbdkit-plugin.h>

 #include "cleanup.h"
@@ -477,7 +479,7 @@ py_get_size (void *handle)

 static int
 py_pread (void *handle, void *buf,
-          uint32_t count, uint64_t offset)
+          uint32_t count, uint64_t offset, uint32_t flags)
 {
   PyObject *obj = handle;
   PyObject *fn;
@@ -485,6 +487,7 @@ py_pread (void *handle, void *buf,
   Py_buffer view = {0};
   int ret = -1;

+  assert (!flags);
   if (!callback_defined ("pread", &fn)) {
     nbdkit_error ("%s: missing callback: %s", script, "pread");
     return ret;
@@ -523,12 +526,13 @@ out:

 static int
 py_pwrite (void *handle, const void *buf,
-           uint32_t count, uint64_t offset)
+           uint32_t count, uint64_t offset, uint32_t flags)
 {
   PyObject *obj = handle;
   PyObject *fn;
   PyObject *r;

+  assert (!flags);
   if (callback_defined ("pwrite", &fn)) {
     PyErr_Clear ();

@@ -549,12 +553,13 @@ py_pwrite (void *handle, const void *buf,
 }

 static int
-py_flush (void *handle)
+py_flush (void *handle, uint32_t flags)
 {
   PyObject *obj = handle;
   PyObject *fn;
   PyObject *r;

+  assert (!flags);
   if (callback_defined ("flush", &fn)) {
     PyErr_Clear ();

@@ -573,12 +578,13 @@ py_flush (void *handle)
 }

 static int
-py_trim (void *handle, uint32_t count, uint64_t offset)
+py_trim (void *handle, uint32_t count, uint64_t offset, uint32_t flags)
 {
   PyObject *obj = handle;
   PyObject *fn;
   PyObject *r;

+  assert (!flags);
   if (callback_defined ("trim", &fn)) {
     PyErr_Clear ();

@@ -597,14 +603,16 @@ py_trim (void *handle, uint32_t count, uint64_t offset)
 }

 static int
-py_zero (void *handle, uint32_t count, uint64_t offset, int may_trim)
+py_zero (void *handle, uint32_t count, uint64_t offset, uint32_t flags)
 {
   PyObject *obj = handle;
   PyObject *fn;
   PyObject *args;
   PyObject *kwargs;
   PyObject *r;
+  int may_trim = (flags & NBDKIT_FLAG_MAY_TRIM) != 0;

+  assert (!(flags & ~NBDKIT_FLAG_MAY_TRIM));
   if (callback_defined ("zero", &fn)) {
     static int zero_may_trim = -1;

-- 
2.21.0