[Libguestfs] [nbdkit PATCH 2/5] python: Expose can_zero callback

Fairly straightforward, as the code in plugins.c already takes care of necessary .pwrite fallbacks. Signed-off-by: Eric Blake <eblake(a)redhat.com&gt; --- plugins/python/nbdkit-python-plugin.pod | 8 +++++++- plugins/python/python.c | 7 +++++++ tests/test.py | 4 ++++ 3 files changed, 18 insertions(+), 1 deletion(-) diff --git a/plugins/python/nbdkit-python-plugin.pod b/plugins/python/nbdkit-python-plugin.pod index f504cf7a..ec126f5a 100644 --- a/plugins/python/nbdkit-python-plugin.pod +++ b/plugins/python/nbdkit-python-plugin.pod @@ -208,6 +208,13 @@ contents will be garbage collected. def can_trim(h): # return a boolean +=item C<can_zero> + +(Optional) + + def can_zero(h): + # return a boolean + =item C<pread> (Required) @@ -317,7 +324,6 @@ C<config_help>, C<magic_config_key>, C<can_fua>, C<can_cache>, -C<can_zero>, C<can_fast_zero>, C<can_extents>, C<can_multi_conn>, diff --git a/plugins/python/python.c b/plugins/python/python.c index d18bcb5e..aa09dce7 100644 --- a/plugins/python/python.c +++ b/plugins/python/python.c @@ -718,6 +718,12 @@ py_can_trim (void *handle) return boolean_callback (handle, "can_trim", "trim"); } +static int +py_can_zero (void *handle) +{ + return boolean_callback (handle, "can_zero", "zero"); +} + #define py_config_help \ "script=<FILENAME> (required) The Python plugin to run.\n" \ "[other arguments may be used by the plugin that you load]" @@ -744,6 +750,7 @@ static struct nbdkit_plugin plugin = { .can_write = py_can_write, .can_flush = py_can_flush, .can_trim = py_can_trim, + .can_zero = py_can_zero, .pread = py_pread, .pwrite = py_pwrite, diff --git a/tests/test.py b/tests/test.py index a83f1181..1b7d3e0e 100644 --- a/tests/test.py +++ b/tests/test.py @@ -32,6 +32,10 @@ def can_trim(h): return True +def can_zero(h): + return True + + def pread(h, count, offset): global disk return disk[offset:offset+count] -- 2.21.0